firebird-mirror/src/jrd/jrd.cpp

/*
 *	PROGRAM:	JRD Access Method
 *	MODULE:		jrd.cpp
 *	DESCRIPTION:	User visible entrypoints
 *
 * The contents of this file are subject to the Interbase Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy
 * of the License at http://www.Inprise.com/IPL.html
 *
 * Software distributed under the License is distributed on an
 * "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code was created by Inprise Corporation
 * and its predecessors. Portions created by Inprise Corporation are
 * Copyright (C) Inprise Corporation.
 *
 * All Rights Reserved.
 * Contributor(s): ______________________________________.
 *
 * 2001.07.06 Sean Leyne - Code Cleanup, removed "#ifdef READONLY_DATABASE"
 *                         conditionals, as the engine now fully supports
 *                         readonly databases.
 * 2001.07.09 Sean Leyne - Restore default setting to Force Write = "On", for
 *                         Windows NT platform, for new database files. This was changed
 *                         with IB 6.0 to OFF and has introduced many reported database
 *                         corruptions.
 *
 * 2002.10.29 Sean Leyne - Removed obsolete "Netware" port
 * Claudio Valderrama C.
 * Adriano dos Santos Fernandes
 *
 */

#include "firebird.h"
#include "../common/common.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../common/common.h"
#include "../common/ThreadStart.h"
#include <stdarg.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <errno.h>

#include "../jrd/ibase.h"
#include "../jrd/jrd.h"
#include "../jrd/irq.h"
#include "../jrd/drq.h"
#include "../jrd/req.h"
#include "../jrd/tra.h"
#include "../jrd/blb.h"
#include "../jrd/lck.h"
#include "../jrd/nbak.h"
#include "../jrd/scl.h"
#include "../jrd/os/pio.h"
#include "../jrd/ods.h"
#include "../jrd/exe.h"
#include "../jrd/extds/ExtDS.h"
#include "../jrd/val.h"
#include "../jrd/rse.h"
#include "../jrd/intl.h"
#include "../jrd/sbm.h"
#include "../jrd/svc.h"
#include "../jrd/sdw.h"
#include "../jrd/lls.h"
#include "../jrd/cch.h"
#include "../intl/charsets.h"
#include "../jrd/sort.h"
#include "../jrd/PreparedStatement.h"
#include "../dsql/StmtNodes.h"

#include "../jrd/blb_proto.h"
#include "../jrd/cch_proto.h"
#include "../jrd/cmp_proto.h"
#include "../jrd/err_proto.h"
#include "../jrd/exe_proto.h"
#include "../jrd/ext_proto.h"
#include "../jrd/fun_proto.h"
#include "../yvalve/gds_proto.h"
#include "../jrd/inf_proto.h"
#include "../jrd/ini_proto.h"
#include "../jrd/intl_proto.h"
#include "../common/isc_f_proto.h"
#include "../common/isc_proto.h"
#include "../jrd/jrd_proto.h"

#include "../jrd/lck_proto.h"
#include "../jrd/met_proto.h"
#include "../jrd/mov_proto.h"
#include "../jrd/opt_proto.h"
#include "../jrd/pag_proto.h"
#include "../jrd/par_proto.h"
#include "../jrd/os/pio_proto.h"
#include "../jrd/scl_proto.h"
#include "../jrd/sdw_proto.h"
#include "../jrd/shut_proto.h"
#include "../jrd/thread_proto.h"
#include "../jrd/tpc_proto.h"
#include "../jrd/tra_proto.h"
#include "../jrd/val_proto.h"
#include "../jrd/vio_proto.h"
#include "../common/file_params.h"
#include "../jrd/event_proto.h"
#include "../yvalve/why_proto.h"
#include "../jrd/flags.h"

#include "../jrd/Database.h"

#include "../common/config/config.h"
#include "../common/config/dir_list.h"
#include "../common/db_alias.h"
#include "../jrd/trace/TraceManager.h"
#include "../jrd/trace/TraceObjects.h"
#include "../jrd/trace/TraceJrdHelpers.h"
#include "../jrd/IntlManager.h"
#include "../common/classes/fb_tls.h"
#include "../common/classes/ClumpletReader.h"
#include "../common/classes/RefMutex.h"
#include "../common/utils_proto.h"
#include "../jrd/DebugInterface.h"
#include "../jrd/EngineInterface.h"

#include "../dsql/dsql.h"
#include "../dsql/dsql_proto.h"

using namespace Jrd;
using namespace Firebird;

const SSHORT WAIT_PERIOD	= -1;

#ifdef SUPPORT_RAW_DEVICES
#define unlink PIO_unlink
#endif

#ifdef DEV_BUILD
int debug;
#endif

namespace Jrd
{

int JBlob::release()
{
	if (--refCounter != 0)
		return 1;

	if (blob)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (!blob)
	{
		delete this;
	}

	return 0;
}

int JTransaction::release()
{
	if (--refCounter != 0)
		return 1;

	if (transaction)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (!transaction)
	{
		delete this;
	}

	return 0;
}

int JStatement::release()
{
	if (--refCounter != 0)
		return 1;

	if (statement)
	{
		LocalStatus status;
		freeEngineData(&status, DSQL_drop);
	}
	if (!statement)
	{
		delete this;
	}

	return 0;
}

int JRequest::release()
{
	if (--refCounter != 0)
		return 1;

	if (rq)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (!rq)
	{
		delete this;
	}

	return 0;
}

int JEvents::release()
{
	if (--refCounter != 0)
		return 1;

	if (id >= 0)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (id < 0)
	{
		delete this;
	}

	return 0;
}

JAttachment::JAttachment(Attachment* handle)
	: att(handle)
{
}

int JAttachment::release()
{
	if (--refCounter != 0)
		return 1;

	if (att)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (!att)
	{
		delete this;
	}

	return 0;
}

JService::JService(Service* handle)
	: svc(handle)
{
}

int JService::release()
{
	if (--refCounter != 0)
		return 1;

	if (svc)
	{
		LocalStatus status;
		freeEngineData(&status);
	}
	if (!svc)
	{
		delete this;
	}

	return 0;
}

int JProvider::release()
{
	if (--refCounter == 0)
	{
		delete this;
		return 0;
	}

	return 1;
}


static void shutdownBeforeUnload()
{
	LocalStatus status;
	JProvider::getInstance()->shutdown(&status, 0, fb_shutrsn_exit_called);
};

class EngineFactory : public AutoIface<IPluginFactory, FB_PLUGIN_FACTORY_VERSION>
{
public:
	// IPluginFactory implementation
	IPluginBase* FB_CARG createPlugin(IPluginConfig* factoryParameter)
	{
		if (myModule->unloadStarted())
		{
			return NULL;
		}

		IPluginBase* p = new JProvider(factoryParameter);
		p->addRef();
		return p;
	}
};

static Static<EngineFactory> engineFactory;

void registerEngine(IPluginManager* iPlugin)
{
	myModule->setCleanup(shutdownBeforeUnload);
	iPlugin->registerPluginFactory(PluginType::Provider, "Engine12", &engineFactory);
	myModule->registerMe();
}

} // namespace Jrd

extern "C" void FB_PLUGIN_ENTRY_POINT(IMaster* /*master*/)
{
	PluginManagerInterfacePtr pi;
	registerEngine(pi);
}

namespace
{
	using Jrd::Attachment;

	Database* databases = NULL;
	GlobalPtr<Mutex> databases_mutex;
	bool engineShuttingDown = false;

	class EngineStartup
	{
	public:
		static void init()
		{
			IbUtil::initialize();
			IntlManager::initialize();
			ExtEngineManager::initialize();
		}

		static void cleanup()
		{
		}
	};

	InitMutex<EngineStartup> engineStartup;

	inline void validateHandle(thread_db* tdbb, Jrd::Attachment* const attachment)
	{
		if (attachment && attachment == tdbb->getAttachment())
			return;

		if (!attachment || !attachment->att_database)
			status_exception::raise(Arg::Gds(isc_bad_db_handle));

		tdbb->setAttachment(attachment);
		tdbb->setDatabase(attachment->att_database);
	}

	inline void validateHandle(thread_db* tdbb, jrd_tra* const transaction)
	{
		if (!transaction)
			status_exception::raise(Arg::Gds(isc_bad_trans_handle));

		validateHandle(tdbb, transaction->tra_attachment);

		tdbb->setTransaction(transaction);
	}

	inline void validateHandle(thread_db* tdbb, JrdStatement* const statement)
	{
		if (!statement)
			status_exception::raise(Arg::Gds(isc_bad_req_handle));

		validateHandle(tdbb, statement->requests[0]->req_attachment);
	}

	inline void validateHandle(thread_db* tdbb, dsql_req* const statement)
	{
		if (!statement)
			status_exception::raise(Arg::Gds(isc_bad_req_handle));

		validateHandle(tdbb, statement->req_dbb->dbb_attachment);
	}

	inline void validateHandle(thread_db* tdbb, blb* blob)
	{
		if (!blob)
			status_exception::raise(Arg::Gds(isc_bad_segstr_handle));

		validateHandle(tdbb, blob->blb_transaction);
		validateHandle(tdbb, blob->blb_attachment);
	}

	inline void validateHandle(Service* service)
	{
		if (!service)
			status_exception::raise(Arg::Gds(isc_bad_svc_handle));
	}

	inline void validateHandle(thread_db* tdbb, JEvents* const events)
	{
		validateHandle(tdbb, events->getAttachment()->getHandle());
	}

	class AttachmentHolder
	{
	public:
		AttachmentHolder(thread_db* tdbb, JAttachment* ja, bool lockAsync)
			: mutex(ja->getMutex(lockAsync)),
			  attachment(ja->getHandle()),
			  async(lockAsync)
		{
			mutex->enter();

			try
			{
				if (!attachment || engineShuttingDown)
					status_exception::raise(Arg::Gds(isc_att_shutdown));

				tdbb->setAttachment(attachment);
				tdbb->setDatabase(attachment->att_database);
				if (!lockAsync)
				{
					attachment->att_use_count++;
				}
			}
			catch (const Firebird::Exception&)
			{
				mutex->leave();
				throw;
			}
		}

		~AttachmentHolder()
		{
			if (!async)
			{
				attachment->att_use_count--;
			}
			mutex->leave();
		}

	private:
		Firebird::Mutex* mutex;
		Jrd::Attachment* attachment;
		bool async;

	private:
		// copying is prohibited
		AttachmentHolder(const AttachmentHolder&);
		AttachmentHolder& operator =(const AttachmentHolder&);
	};

	class EngineContextHolder : public ThreadContextHolder, private AttachmentHolder,
		private DatabaseContextHolder
	{
	public:
		template <typename I>
		EngineContextHolder(IStatus* status, I* interfacePtr, bool lockAsync = false)
			: ThreadContextHolder(status),
			  AttachmentHolder(*this, interfacePtr->getAttachment(), lockAsync),
			  DatabaseContextHolder(operator thread_db*())
		{
			validateHandle(*this, interfacePtr->getHandle());
		}

	};

	void validateAccess(const Jrd::Attachment* attachment)
	{
		if (!attachment->locksmith())
		{
			ERR_post(Arg::Gds(isc_adm_task_denied));
		}
	}
} // anonymous


#ifdef  WIN_NT
#include <windows.h>
// these should stop a most annoying warning
#undef TEXT
#define TEXT    SCHAR
#endif	// WIN_NT

void Trigger::compile(thread_db* tdbb)
{
	SET_TDBB(tdbb);

	Database* dbb = tdbb->getDatabase();
	Jrd::Attachment* const att = tdbb->getAttachment();

	if (engine.isEmpty() && !extTrigger)
	{
		if (!statement /*&& !compile_in_progress*/)
		{
			if (statement)
				return;

			compile_in_progress = true;
			// Allocate statement memory pool
			MemoryPool* new_pool = att->createPool();
			// Trigger request is not compiled yet. Lets do it now
			USHORT par_flags = (USHORT) (flags & TRG_ignore_perm) ? csb_ignore_perm : 0;
			if (type & 1)
				par_flags |= csb_pre_trigger;
			else
				par_flags |= csb_post_trigger;

			CompilerScratch* csb = NULL;
			try {
				Jrd::ContextPoolHolder context(tdbb, new_pool);

				csb = CompilerScratch::newCsb(*tdbb->getDefaultPool(), 5);
				csb->csb_g_flags |= par_flags;

				if (!dbg_blob_id.isEmpty())
					DBG_parse_debug_info(tdbb, &dbg_blob_id, *csb->csb_dbg_info);

				PAR_blr(tdbb, relation, blr.begin(), (ULONG) blr.getCount(), NULL, &csb, &statement,
					(relation ? true : false), par_flags);

				delete csb;
			}
			catch (const Exception&)
			{
				compile_in_progress = false;
				delete csb;
				csb = NULL;

				if (statement)
				{
					statement->release(tdbb);
					statement = NULL;
				}
				else
					att->deletePool(new_pool);

				throw;
			}

			statement->triggerName = name;

			if (sys_trigger)
				statement->flags |= JrdStatement::FLAG_SYS_TRIGGER;

			if (flags & TRG_ignore_perm)
				statement->flags |= JrdStatement::FLAG_IGNORE_PERM;

			compile_in_progress = false;
		}

		return;
	}

	// external trigger

	if (extTrigger)
		return;

	extTrigger = dbb->dbb_extManager.makeTrigger(tdbb, this, engine, entryPoint, extBody.c_str(),
		(relation ? (type & 1 ?
						Firebird::ExternalTrigger::TYPE_BEFORE :
						Firebird::ExternalTrigger::TYPE_AFTER) :
					Firebird::ExternalTrigger::TYPE_DATABASE));
}

void Trigger::release(thread_db* tdbb)
{
	if (extTrigger)
	{
		delete extTrigger;
		extTrigger = NULL;
	}

	if (blr.getCount() == 0 || !statement || statement->isActive())
		return;

	statement->release(tdbb);
	statement = NULL;
}

// Option block for database parameter block

class DatabaseOptions
{
public:
	USHORT	dpb_wal_action;
	SLONG	dpb_sweep_interval;
	ULONG	dpb_page_buffers;
	bool	dpb_set_page_buffers;
	ULONG	dpb_buffers;
	USHORT	dpb_verify;
	USHORT	dpb_sweep;
	USHORT	dpb_dbkey_scope;
	USHORT	dpb_page_size;
	bool	dpb_activate_shadow;
	bool	dpb_delete_shadow;
	bool	dpb_no_garbage;
	USHORT	dpb_shutdown;
	SSHORT	dpb_shutdown_delay;
	USHORT	dpb_online;
	bool	dpb_force_write;
	bool	dpb_set_force_write;
	bool	dpb_no_reserve;
	bool	dpb_set_no_reserve;
	SSHORT	dpb_interp;
	bool	dpb_single_user;
	bool	dpb_overwrite;
	bool	dpb_sec_attach;
	bool	dpb_disable_wal;
	bool	dpb_gsec_attach;
	SLONG	dpb_connect_timeout;
	SLONG	dpb_dummy_packet_interval;
	bool	dpb_db_readonly;
	bool	dpb_set_db_readonly;
	bool	dpb_gfix_attach;
	bool	dpb_gstat_attach;
	USHORT	dpb_sql_dialect;
	USHORT	dpb_set_db_sql_dialect;
	SLONG	dpb_remote_pid;
	bool	dpb_no_db_triggers;
	bool	dpb_gbak_attach;
	bool	dpb_utf8_filename;
	ULONG	dpb_ext_call_depth;
	ULONG	dpb_flags;			// to OR'd with dbb_flags

	// here begin compound objects
	// for constructor to work properly dpb_user_name
	// MUST be FIRST
	string	dpb_user_name;
	AuthReader::AuthBlock	dpb_auth_block;
	string	dpb_role_name;
	string	dpb_journal;
	string	dpb_key;
	string	dpb_lc_ctype;
	PathName	dpb_working_directory;
	string	dpb_set_db_charset;
	string	dpb_network_protocol;
	string	dpb_remote_address;
	string	dpb_trusted_login;
	PathName	dpb_remote_process;
	PathName	dpb_org_filename;

public:
	DatabaseOptions()
	{
		memset(this, 0,
			reinterpret_cast<char*>(&this->dpb_user_name) - reinterpret_cast<char*>(this));
	}

	void get(const UCHAR*, USHORT, bool&);

	void setBuffers(RefPtr<Config> config)
	{
		if (dpb_buffers == 0)
		{
			dpb_buffers = config->getDefaultDbCachePages();

			if (dpb_buffers < MIN_PAGE_BUFFERS)
				dpb_buffers = MIN_PAGE_BUFFERS;
			if (dpb_buffers > MAX_PAGE_BUFFERS)
				dpb_buffers = MAX_PAGE_BUFFERS;
		}
	}

private:
	void getPath(ClumpletReader& reader, PathName& s)
	{
		reader.getPath(s);
		if (!dpb_utf8_filename)
			ISC_systemToUtf8(s);
		ISC_unescape(s);
	}

	void getString(ClumpletReader& reader, string& s)
	{
		reader.getString(s);
		if (!dpb_utf8_filename)
			ISC_systemToUtf8(s);
		ISC_unescape(s);
	}
};

/// trace manager support

class TraceFailedConnection : public AutoIface<TraceConnection, FB_TRACE_CONNECTION_VERSION>
{
public:
	TraceFailedConnection(const char* filename, const DatabaseOptions* options);

	// TraceConnection implementation
	virtual int FB_CARG getConnectionID()				{ return 0; }
	virtual int FB_CARG getProcessID()					{ return m_options->dpb_remote_pid; }
	virtual const char* FB_CARG getDatabaseName()		{ return m_filename; }
	virtual const char* FB_CARG getUserName()			{ return m_id.usr_user_name.c_str(); }
	virtual const char* FB_CARG getRoleName()			{ return m_options->dpb_role_name.c_str(); }
	virtual const char* FB_CARG getCharSet()			{ return m_options->dpb_lc_ctype.c_str(); }
	virtual const char* FB_CARG getRemoteProtocol()		{ return m_options->dpb_network_protocol.c_str(); }
	virtual const char* FB_CARG getRemoteAddress()		{ return m_options->dpb_remote_address.c_str(); }
	virtual int FB_CARG getRemoteProcessID()			{ return m_options->dpb_remote_pid; }
	virtual const char* FB_CARG getRemoteProcessName()	{ return m_options->dpb_remote_process.c_str(); }

private:
	const char* m_filename;
	const DatabaseOptions* m_options;
	UserId m_id;
};

static void			cancel_attachments(thread_db* tdbb);
static void			check_database(thread_db* tdbb);
static void			check_transaction(thread_db*, jrd_tra*);
static void			commit(thread_db*, jrd_tra*, const bool);
static bool			drop_files(const jrd_file*);
static void			find_intl_charset(thread_db*, Jrd::Attachment*, const DatabaseOptions*);
static jrd_tra*		find_transaction(thread_db*, ISC_STATUS);
static void			init_database_locks(thread_db*);
static void			run_commit_triggers(thread_db* tdbb, jrd_tra* transaction);
static jrd_req*		verify_request_synchronization(JrdStatement* statement, USHORT level);
static unsigned int purge_transactions(thread_db*, Jrd::Attachment*, const bool, const ULONG);

static void 		handle_error(Firebird::IStatus*, ISC_STATUS);

namespace {
	enum VdnResult {VDN_FAIL, VDN_OK, VDN_SECURITY};
}
static VdnResult	verifyDatabaseName(const PathName&, ISC_STATUS*, bool);

static ISC_STATUS	unwindAttach(thread_db* tdbb, const Exception& ex, Firebird::IStatus* userStatus,
	Jrd::Attachment* attachment, Database* dbb);

static Database*	init(thread_db*, const PathName&, RefPtr<Config>, bool);
static void		prepare_tra(thread_db*, jrd_tra*, USHORT, const UCHAR*);
static void		start_transaction(thread_db* tdbb, bool transliterate, jrd_tra** tra_handle,
	Jrd::Attachment* attachment, unsigned int tpb_length, const UCHAR* tpb);
static void		release_attachment(thread_db*, Jrd::Attachment*);
static void		rollback(thread_db*, jrd_tra*, const bool);
static void		shutdown_database(Database*, const bool);
static void		strip_quotes(string&);
static void		purge_attachment(thread_db*, Jrd::Attachment*, const bool);
static void		getUserInfo(UserId&, const DatabaseOptions&, const RefPtr<Config>*);
static bool		shutdown_dbb(thread_db*, Database*);

static THREAD_ENTRY_DECLARE shutdown_thread(THREAD_ENTRY_PARAM);


TraceFailedConnection::TraceFailedConnection(const char* filename, const DatabaseOptions* options) :
	m_filename(filename),
	m_options(options)
{
	getUserInfo(m_id, *m_options, NULL);
}


static void cancel_attachments(thread_db* /*tdbb*/)
{
	MutexLockGuard guard(databases_mutex);
	engineShuttingDown = true;

	for (Database* dbb = databases; dbb; dbb = dbb->dbb_next)
	{
		if ( !(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use | DBB_security_db)) )
		{
			SyncLockGuard guard(&dbb->dbb_sync, SYNC_EXCLUSIVE, "cancel_attachments");
			Jrd::Attachment* lockedAtt = NULL;
			Jrd::Attachment* att = dbb->dbb_attachments;

			while (att)
			{
				// Try to cancel attachment and lock it. Handle case when attachment
				// deleted while waiting for lock.
				RefPtr<JAttachment> jAtt(att->att_interface);
				MutexLockGuard asyncGuard(*(jAtt->getMutex(true)));
				att->att_flags |= ATT_shutdown;
				while (true)
				{
					if (att->att_interface->getMutex()->tryEnter())
					{
						if (att->att_use_count)
						{
							att->att_interface->getMutex()->leave();
						}
						else
						{
							jAtt->cancel();
							lockedAtt = att;
							break;
						}
					}
					if (att->att_flags & ATT_purge_error)
					{
						lockedAtt = att;
						break;
					}

					THREAD_YIELD();

					//{ // scope
					//	const bool cancel_disable = (att->att_flags & ATT_cancel_disable);
					//	SyncUnlockGuard cout(guard);
					//	if (!cancel_disable)
					//	{
					//		ThreadStatusGuard temp_status(tdbb);
					//		JRD_cancel_operation(tdbb, att, fb_cancel_enable);
					//		JRD_cancel_operation(tdbb, att, fb_cancel_raise);
					//	}

					//	THREAD_YIELD();
					//} // end scope

					// check if attachment still exist
					if (lockedAtt && lockedAtt->att_next != att) {
						break;
					}
					if (!lockedAtt && dbb->dbb_attachments != att) {
						break;
					}
				}
				att = lockedAtt ? lockedAtt->att_next : dbb->dbb_attachments;
			}
		}
	}
}


//____________________________________________________________
//
// check whether we need to perform an autocommit;
// do it here to prevent committing every record update
// in a statement
//
static void check_autocommit(jrd_req* request, thread_db* tdbb)
{
	// dimitr: we should ignore autocommit for requests
	// created by EXECUTE STATEMENT
	// AP: also do nothing if request is cancelled and
	// transaction is already missing
	if ((!request->req_transaction) || (request->req_transaction->tra_callback_count > 0))
		return;

	if (request->req_transaction->tra_flags & TRA_perform_autocommit)
	{
		if (!(tdbb->getAttachment()->att_flags & ATT_no_db_triggers) &&
			!(request->req_transaction->tra_flags & TRA_prepared))
		{
			// run ON TRANSACTION COMMIT triggers
			run_commit_triggers(tdbb, request->req_transaction);
		}

		request->req_transaction->tra_flags &= ~TRA_perform_autocommit;
		TRA_commit(tdbb, request->req_transaction, true);
	}
}


static ISC_STATUS successful_completion(Firebird::IStatus* s, ISC_STATUS return_code = FB_SUCCESS)
{
	fb_assert(s);

	const ISC_STATUS* status = s->get();

	// This assert validates whether we really have a successful status vector
	fb_assert(status[0] != isc_arg_gds || status[1] == FB_SUCCESS);

	// Clear the status vector if it doesn't contain a warning
	if (status[0] != isc_arg_gds || status[1] != FB_SUCCESS || status[2] != isc_arg_warning)
	{
		/*if (return_code != FB_SUCCESS)
		{
			s->set(Arg::Gds(return_code).value());
		}
		else
		{*/
			s->init();
		//}
	}

	return return_code;
}


// Stuff exception transliterated to the client charset.
ISC_STATUS transliterateException(thread_db* tdbb, const Exception& ex, Firebird::IStatus* vector) throw()
{
	Jrd::Attachment* attachment = tdbb->getAttachment();
	USHORT charSet;

	ex.stuffException(vector);

	if (!attachment || (charSet = attachment->att_client_charset) == CS_METADATA ||
		charSet == CS_NONE)
	{
		return vector->get()[1];
	}

	// OK as long as we do not change vectors length
	// for current way of keeping strings in vector!

	ISC_STATUS* const vectorStart = const_cast<ISC_STATUS*>(vector->get());
	ISC_STATUS* status = vectorStart;
	Array<UCHAR*> buffers;

	try
	{
		bool cont = true;

		while (cont)
		{
			const ISC_STATUS type = *status++;

			switch (type)
			{
			case isc_arg_end:
				cont = false;
				break;

			case isc_arg_cstring:
				{
					size_t len = *status;
					const UCHAR* str = reinterpret_cast<UCHAR*>(status[1]);

					try
					{
						UCHAR* p = new UCHAR[len + 1];
						buffers.add(p);
						len = INTL_convert_bytes(tdbb, charSet, p, len, CS_METADATA, str, len, ERR_post);
						p[len] = '\0';
						str = p;
					}
					catch (const Exception&)
					{
					}

					*status++ = (ISC_STATUS) len;
					*status++ = (ISC_STATUS)(IPTR) str;
				}
				break;

			case isc_arg_string:
			case isc_arg_interpreted:
				{
					const UCHAR* str = reinterpret_cast<UCHAR*>(*status);
					size_t len = strlen((const char*) str);

					try
					{
						UCHAR* p = new UCHAR[len + 1];
						buffers.add(p);
						len = INTL_convert_bytes(tdbb, charSet, p, len, CS_METADATA, str, len, ERR_post);
						p[len] = '\0';
						str = p;
					}
					catch (const Exception&)
					{
					}

					*status++ = (ISC_STATUS)(IPTR) str;
				}
				break;

			default:
				++status;
				break;
			}
		}
	}
	catch (...)
	{
		return ex.stuff_exception(vectorStart);
	}

	makePermanentVector(vectorStart);

	for (Array<UCHAR*>::iterator i = buffers.begin(); i != buffers.end(); ++i)
		delete [] *i;

	return vectorStart[1];
}


const int SWEEP_INTERVAL		= 20000;

const char DBL_QUOTE			= '\042';
const char SINGLE_QUOTE			= '\'';

// External hook definitions

/* dimitr: just uncomment the following line to use this feature.
		   Requires support from the PIO modules. Only Win32 is 100% ready
		   for this so far. Note that the database encryption code in the
		   PIO layer seems to be incompatible with the SUPERSERVER_V2 code.
		   2003.02.09 */
//#define ISC_DATABASE_ENCRYPTION

// The code that uses these constants was disabled by Adriano with comment "old PluginManager".
//static const char* CRYPT_IMAGE = "fbcrypt";
//static const char* ENCRYPT = "encrypt";
//static const char* DECRYPT = "decrypt";


static void trace_failed_attach(TraceManager* traceManager, const char* filename,
	const DatabaseOptions& options, bool create, bool no_priv)
{
	// Report to Trace API that attachment has not been created
	const char* origFilename = filename;
	if (options.dpb_org_filename.hasData())
		origFilename = options.dpb_org_filename.c_str();

	if (!traceManager)
	{
		TraceManager tempMgr(origFilename);

		if (tempMgr.needs(TRACE_EVENT_ATTACH))
		{
			TraceFailedConnection conn(origFilename, &options);
			tempMgr.event_attach(&conn, create, no_priv ? res_unauthorized : res_failed);
		}
	}
	else
	{
		if (traceManager->needs(TRACE_EVENT_ATTACH))
		{
			TraceFailedConnection conn(origFilename, &options);
			traceManager->event_attach(&conn, create, no_priv ? res_unauthorized : res_failed);
		}
	}
}

namespace Jrd {

JTransaction* JAttachment::getTransactionInterface(IStatus* status, ITransaction* tra)
{
	if (!tra)
		Arg::Gds(isc_bad_trans_handle).raise();

	status->init();

	// If validation is successfull, this means that this attachment and valid transaction
	// use same provider. I.e. the following cast is safe.
	JTransaction* jt = static_cast<JTransaction*>(tra->validate(status, this));
	if (!status->isSuccess())
		status_exception::raise(status->get());
	if (!jt)
		Arg::Gds(isc_bad_trans_handle).raise();

	return jt;
}

jrd_tra* JAttachment::getEngineTransaction(IStatus* status, ITransaction* tra)
{
	return getTransactionInterface(status, tra)->getHandle();
}

JAttachment* FB_CARG JProvider::attachDatabase(IStatus* user_status, const char* filename,
	unsigned int dpb_length, const unsigned char* dpb)
{
/**************************************
 *
 *	g d s _ $ a t t a c h _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Attach a moldy, grungy, old database
 *	sullied by user data.
 *
 **************************************/
	try
	{
		ThreadContextHolder tdbb(user_status);

		UserId userId;
		DatabaseOptions options;
		RefPtr<Config> config;
		bool invalid_client_SQL_dialect = false;
		PathName file_name, expanded_name;
		bool is_alias = false;

		try
		{
			// Process database parameter block
			options.get(dpb, dpb_length, invalid_client_SQL_dialect);

			if (options.dpb_org_filename.hasData())
				file_name = options.dpb_org_filename;
			else
			{
				file_name = filename;

				if (!options.dpb_utf8_filename)
					ISC_systemToUtf8(file_name);

				ISC_unescape(file_name);
			}

			ISC_utf8ToSystem(file_name);

			// Resolve given alias name
			is_alias = ResolveDatabaseAlias(file_name, expanded_name, &config);
			if (is_alias)
			{
				ISC_systemToUtf8(expanded_name);
				ISC_unescape(expanded_name);
				ISC_utf8ToSystem(expanded_name);
				ISC_expand_filename(expanded_name, false);
			}
			else
			{
				expanded_name = filename;

				if (!options.dpb_utf8_filename)
					ISC_systemToUtf8(expanded_name);

				ISC_unescape(expanded_name);
				ISC_utf8ToSystem(expanded_name);
			}

			// Check to see if the database is truly local
			if (ISC_check_if_remote(expanded_name, true))
			{
				handle_error(user_status, isc_unavailable);
			}

			// Check for correct credentials supplied
			getUserInfo(userId, options, &config);
		}
		catch (const Exception&)
		{
			trace_failed_attach(NULL, filename, options, false, true);
			throw;
		}

		// Check database against conf file.
		const VdnResult vdn = verifyDatabaseName(expanded_name, tdbb->tdbb_status_vector, is_alias);
		if (!is_alias && vdn == VDN_FAIL)
		{
			trace_failed_attach(NULL, filename, options, false, false);
			status_exception::raise(tdbb->tdbb_status_vector);
		}

		Database* dbb = NULL;
		MutexEnsureUnlock guardDatabases(databases_mutex);
		guardDatabases.enter();

		// Unless we're already attached, do some initialization
		dbb = init(tdbb, expanded_name, config, true);

		fb_assert(dbb);
		Sync dbbGuard(&dbb->dbb_sync, "attachDatabase");
		dbbGuard.lock(SYNC_EXCLUSIVE);

		tdbb->setDatabase(dbb);
		DatabaseContextHolder dbbHolder(tdbb);

		dbb->dbb_flags |= DBB_being_opened;

		// Initialize special error handling

		Jrd::Attachment* attachment = NULL;

		bool initing_security = false;

		try
		{
			// If database to be opened is security database, then only
			// gsec or SecurityDatabase may open it. This protects from use
			// of old gsec to write wrong password hashes into it.
			if (vdn == VDN_SECURITY && !options.dpb_gsec_attach && !options.dpb_sec_attach)
			{
				ERR_post(Arg::Gds(isc_no_priv) << Arg::Str("direct") <<
												  Arg::Str("security database") <<
												  Arg::Str(file_name));
			}

			// Worry about encryption key

			if (dbb->dbb_decrypt)
			{
				if (dbb->dbb_filename.hasData() &&
					(dbb->dbb_encrypt_key.hasData() || options.dpb_key.hasData()))
				{
					if ((dbb->dbb_encrypt_key.hasData() && options.dpb_key.isEmpty()) ||
						(dbb->dbb_encrypt_key.empty() && options.dpb_key.hasData()) ||
						(dbb->dbb_encrypt_key != options.dpb_key))
					{
						ERR_post(Arg::Gds(isc_no_priv) << Arg::Str("encryption") <<
														  Arg::Str("database") <<
														  Arg::Str(file_name));
					}
				}
				else if (options.dpb_key.hasData())
				{
					dbb->dbb_encrypt_key = options.dpb_key;
				}
			}

			attachment = Jrd::Attachment::create(dbb);

			RefPtr<JAttachment> jAtt(new JAttachment(attachment));
			jAtt->addRef();
			attachment->att_interface = jAtt;
			MutexLockGuard guard(*(jAtt->getMutex()));

			tdbb->setAttachment(attachment);
			attachment->att_filename = is_alias ? file_name : expanded_name;
			attachment->att_network_protocol = options.dpb_network_protocol;
			attachment->att_remote_address = options.dpb_remote_address;
			attachment->att_remote_pid = options.dpb_remote_pid;
			attachment->att_remote_process = options.dpb_remote_process;
			attachment->att_next = dbb->dbb_attachments;
			attachment->att_ext_call_depth = options.dpb_ext_call_depth;

			dbb->dbb_attachments = attachment;
			dbb->dbb_flags &= ~DBB_being_opened;

			attachment->att_client_charset = attachment->att_charset = options.dpb_interp;

			if (options.dpb_no_garbage)
				attachment->att_flags |= ATT_no_cleanup;

			if (options.dpb_gbak_attach)
				attachment->att_flags |= ATT_gbak_attachment;

			if (options.dpb_gstat_attach)
				attachment->att_flags |= ATT_gstat_attachment;

			if (options.dpb_gfix_attach)
				attachment->att_flags |= ATT_gfix_attachment;

			if (options.dpb_working_directory.hasData()) {
				attachment->att_working_directory = options.dpb_working_directory;
			}

			TRA_init(attachment);

			// If we're a not a secondary attachment, initialize some stuff

			bool first = false;

			if (dbb->dbb_filename.empty())
			{
#if defined(DEV_BUILD)
				// make sure we do not reopen same DB twice
				if (config->getSharedCache())
				{
					for (Database* d = databases; d; d = d->dbb_next)
					{
						if (d->dbb_filename == expanded_name)
						{
							fatal_exception::raise(("Attempt to reopen " + expanded_name).c_str());
						}
					}
				}
#endif
				first = true;
				dbb->dbb_filename = expanded_name;
				dbb->dbb_flags |= options.dpb_flags;

				// NS: Use alias as database ID only if accessing database using file name is not possible.
				//
				// This way we:
				// 1. Ensure uniqueness of ID even in presence of multiple processes
				// 2. Make sure that ID value can be used to connect back to database
				//
				if (is_alias && vdn == VDN_FAIL)
					dbb->dbb_database_name = file_name;
				else
					dbb->dbb_database_name = expanded_name;

				PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
				pageSpace->file = PIO_open(dbb, expanded_name, file_name, false);

				// Initialize the lock manager
				dbb->dbb_lock_mgr = LockManager::create(dbb->getUniqueFileId(), dbb->dbb_config);

				LCK_init(tdbb, LCK_OWNER_database);
				dbb->dbb_flags |= DBB_lck_init_done;

				LCK_init(tdbb, LCK_OWNER_attachment);
				attachment->att_flags |= ATT_lck_init_done;

				// Initialize locks
				init_database_locks(tdbb);

				INI_init(tdbb);
				SHUT_init(tdbb);
				PAG_header_init(tdbb);
				INI_init2(tdbb);
				PAG_init(tdbb);

				if (options.dpb_set_page_buffers)
				{
#ifdef SHARED_METADATA_CACHE
					// Here we do not let anyone except SYSDBA (like DBO) to change dbb_page_buffers,
					// cause other flags is UserId can be set only when DB is opened.
					// No idea how to test for other cases before init is complete.
					if (userId.locksmith())
#endif
						dbb->dbb_page_buffers = options.dpb_page_buffers;
				}

				options.setBuffers(dbb->dbb_config);
				CCH_init(tdbb, options.dpb_buffers,
					config->getSharedCache() && !config->getSharedDatabase());

				dbb->dbb_tip_cache = FB_NEW(*dbb->dbb_permanent) TipCache(dbb);

				// Initialize backup difference subsystem. This must be done before WAL and shadowing
				// is enabled because nbackup it is a lower level subsystem
				dbb->dbb_backup_manager = FB_NEW(*dbb->dbb_permanent) BackupManager(tdbb, dbb, nbak_state_unknown);

				PAG_init2(tdbb, 0);
				PAG_header(tdbb, false);

				// initialize shadowing as soon as the database is ready for it
				// but before any real work is done
				SDW_init(tdbb, options.dpb_activate_shadow, options.dpb_delete_shadow);
				CCH_init2(tdbb);
			}
			else
			{
				if ((dbb->dbb_flags & options.dpb_flags) != options.dpb_flags)
				{
					// looks like someone tries to attach incompatibly
					status_exception::raise(Arg::Gds(isc_bad_dpb_content));
				}

				fb_assert(dbb->dbb_lock_mgr);

				LCK_init(tdbb, LCK_OWNER_attachment);
				attachment->att_flags |= ATT_lck_init_done;

				INI_init(tdbb);
				INI_init2(tdbb);
				PAG_header(tdbb, true);
			}

			// Attachments to a ReadOnly database need NOT do garbage collection
			if (dbb->dbb_flags & DBB_read_only) {
				attachment->att_flags |= ATT_no_cleanup;
			}

			if (options.dpb_disable_wal)
			{
				ERR_post(Arg::Gds(isc_lock_timeout) <<
						 Arg::Gds(isc_obj_in_use) << Arg::Str(file_name));
			}

			if (options.dpb_buffers && !dbb->dbb_page_buffers) {
				CCH_expand(tdbb, options.dpb_buffers);
			}

			if (!options.dpb_verify && CCH_exclusive(tdbb, LCK_PW, LCK_NO_WAIT))
			{
				TRA_cleanup(tdbb);
			}

			initing_security = true;

			if (invalid_client_SQL_dialect)
			{
				ERR_post(Arg::Gds(isc_inv_client_dialect_specified) << Arg::Num(options.dpb_sql_dialect) <<
						 Arg::Gds(isc_valid_client_dialects) << Arg::Str("1, 2 or 3"));
			}

			if (userId.usr_sql_role_name.hasData())
			{
				switch (options.dpb_sql_dialect)
				{
				case 0:
					// V6 Client --> V6 Server, dummy client SQL dialect 0 was passed
					// It means that client SQL dialect was not set by user
					// and takes DB SQL dialect as client SQL dialect
					if (dbb->dbb_flags & DBB_DB_SQL_dialect_3)
					{
						// DB created in IB V6.0 by client SQL dialect 3
						options.dpb_sql_dialect = SQL_DIALECT_V6;
					}
					else
					{
						// old DB was gbaked in IB V6.0
						options.dpb_sql_dialect = SQL_DIALECT_V5;
					}
					break;
				case 99:
					// V5 Client --> V6 Server, old client has no concept of dialect
					options.dpb_sql_dialect = SQL_DIALECT_V5;
					break;
				default:
					// V6 Client --> V6 Server, but client SQL dialect was set
					// by user and was passed.
					break;
				}

				CharSet* utf8CharSet = IntlUtil::getUtf8CharSet();

				switch (options.dpb_sql_dialect)
				{
				case SQL_DIALECT_V5:
					{
						strip_quotes(userId.usr_sql_role_name);
						IntlUtil::toUpper(utf8CharSet, userId.usr_sql_role_name);
					}
					break;

				case SQL_DIALECT_V6_TRANSITION:
				case SQL_DIALECT_V6:
					{
						string& role = userId.usr_sql_role_name;
						if (role.hasData() && (role[0] == DBL_QUOTE || role[0] == SINGLE_QUOTE))
						{
							const char end_quote = role[0];
							// remove the delimited quotes and escape quote
							// from ROLE name
							role.erase(0, 1);
							for (string::iterator p = role.begin(); p < role.end(); ++p)
							{
								if (*p == end_quote)
								{
									if (++p < role.end() && *p == end_quote)
									{
										// skip the escape quote here
										role.erase(p--);
									}
									else
									{
										// delimited done
										role.erase(--p, role.end());
									}
								}
							}
						}
						else
							IntlUtil::toUpper(utf8CharSet, role);
					}
					break;

				default:
					break;
				}
			}

			options.dpb_sql_dialect = 0;

			SCL_init(tdbb, false, userId);

			initing_security = false;

			// This pair (SHUT_database/SHUT_online) checks itself for valid user name
			if (options.dpb_shutdown)
			{
				SHUT_database(tdbb, options.dpb_shutdown, options.dpb_shutdown_delay);
			}
			if (options.dpb_online)
			{
				SHUT_online(tdbb, options.dpb_online);
			}

			// Check if another attachment has or is requesting exclusive database access.
			// If this is an implicit attachment for the security (password) database, don't
			// try to get exclusive attachment to avoid a deadlock condition which happens
			// when a client tries to connect to the security database itself.

			if (!options.dpb_sec_attach)
			{
				bool attachment_succeeded = true;
				if (dbb->dbb_ast_flags & DBB_shutdown_single)
					attachment_succeeded = CCH_exclusive_attachment(tdbb, LCK_none, -1);
				else
					CCH_exclusive_attachment(tdbb, LCK_none, LCK_WAIT);

				if (attachment->att_flags & ATT_shutdown)
				{
					if (dbb->dbb_ast_flags & DBB_shutdown) {
						ERR_post(Arg::Gds(isc_shutdown) << Arg::Str(file_name));
					}
					else {
						ERR_post(Arg::Gds(isc_att_shutdown));
					}
				}
				if (!attachment_succeeded) {
					ERR_post(Arg::Gds(isc_shutdown) << Arg::Str(file_name));
				}
			}

			// If database is shutdown then kick 'em out.

			if (dbb->dbb_ast_flags & (DBB_shut_attach | DBB_shut_tran))
			{
				ERR_post(Arg::Gds(isc_shutinprog) << Arg::Str(file_name));
			}

			if (dbb->dbb_ast_flags & DBB_shutdown)
			{
				// Allow only SYSDBA/owner to access database that is shut down
				bool allow_access = attachment->locksmith();
				// Handle special shutdown modes
				if (allow_access)
				{
					if (dbb->dbb_ast_flags & DBB_shutdown_full)
					{
						// Full shutdown. Deny access always
						allow_access = false;
					}
					else if (dbb->dbb_ast_flags & DBB_shutdown_single)
					{
						// Single user maintenance. Allow access only if we were able to take exclusive lock
						// Note that logic below this exclusive lock differs for SS and CS builds:
						//   - CS keeps PW database lock from releasing in AST in single-user maintenance mode
						//   - for SS this code effectively checks that no other attachments are present
						//     at call point, ATT_exclusive bit is released just before this procedure exits
						// Things are done this way to handle return to online mode nicely.
						allow_access = CCH_exclusive(tdbb, LCK_PW, WAIT_PERIOD);
					}
				}
				if (!allow_access)
				{
					// Note we throw exception here when entering full-shutdown mode
					ERR_post(Arg::Gds(isc_shutdown) << Arg::Str(file_name));
				}
			}

			// Figure out what character set & collation this attachment prefers

			find_intl_charset(tdbb, attachment, &options);

			// if the attachment is through gbak and this attachment is not by owner
			// or sysdba then return error. This has been added here to allow for the
			// GBAK security feature of only allowing the owner or sysdba to backup a
			// database. smistry 10/5/98

			if ((attachment->att_flags & ATT_gbak_attachment) ||
				(attachment->att_flags & ATT_gfix_attachment) ||
				(attachment->att_flags & ATT_gstat_attachment))
			{
				validateAccess(attachment);
			}

			if (options.dpb_verify)
			{
				validateAccess(attachment);
				if (!CCH_exclusive(tdbb, LCK_PW, WAIT_PERIOD)) {
					ERR_post(Arg::Gds(isc_bad_dpb_content) << Arg::Gds(isc_cant_validate));
				}

				// Can't allow garbage collection during database validation.

				VIO_fini(tdbb);

				if (!VAL_validate(tdbb, options.dpb_verify)) {
					ERR_punt();
				}
			}

			if (options.dpb_journal.hasData()) {
				ERR_post(Arg::Gds(isc_bad_dpb_content) << Arg::Gds(isc_cant_start_journal));
			}

			if (options.dpb_wal_action)
			{
				// No WAL anymore. We deleted it.
				ERR_post(Arg::Gds(isc_no_wal));
			}

			if (((attachment->att_flags & ATT_gfix_attachment) ||
				(attachment->att_flags & ATT_gstat_attachment)))
			{
				options.dpb_no_db_triggers = true;
			}

			if (options.dpb_no_db_triggers)
			{
				validateAccess(attachment);
				attachment->att_flags |= ATT_no_db_triggers;
			}

			if (options.dpb_set_db_sql_dialect)
			{
				validateAccess(attachment);
				PAG_set_db_SQL_dialect(tdbb, options.dpb_set_db_sql_dialect);
			}

			if (options.dpb_sweep_interval != -1)
			{
				validateAccess(attachment);
				PAG_sweep_interval(tdbb, options.dpb_sweep_interval);
				dbb->dbb_sweep_interval = options.dpb_sweep_interval;
			}

			if (options.dpb_set_force_write)
			{
				validateAccess(attachment);
				PAG_set_force_write(tdbb, options.dpb_force_write);
			}

			if (options.dpb_set_no_reserve)
			{
				validateAccess(attachment);
				PAG_set_no_reserve(tdbb, options.dpb_no_reserve);
			}

			if (options.dpb_set_page_buffers)
			{
				if (dbb->dbb_config->getSharedCache())
				{
					validateAccess(attachment);
				}
				if (attachment->locksmith())
				{
					PAG_set_page_buffers(tdbb, options.dpb_page_buffers);
				}
			}

			if (options.dpb_set_db_readonly)
			{
				validateAccess(attachment);
				if (!CCH_exclusive(tdbb, LCK_EX, WAIT_PERIOD))
				{
					ERR_post(Arg::Gds(isc_lock_timeout) <<
							 Arg::Gds(isc_obj_in_use) << Arg::Str(file_name));
				}
				PAG_set_db_readonly(tdbb, options.dpb_db_readonly);
			}

			PAG_attachment_id(tdbb);
			VIO_init(tdbb);
			CCH_release_exclusive(tdbb);

			// if there was an error, the status vector is all set

			guardDatabases.leave();

			if (options.dpb_sweep & isc_dpb_records)
			{
				if (!TRA_sweep(tdbb, 0)) {
					ERR_punt();
				}
			}

			if (options.dpb_dbkey_scope) {
				attachment->att_dbkey_trans = TRA_start(tdbb, 0, 0);
			}

			// Recover database after crash during backup difference file merge
			dbb->dbb_backup_manager->endBackup(tdbb, true); // true = do recovery

			if (attachment->att_trace_manager->needs(TRACE_EVENT_ATTACH))
			{
				TraceConnectionImpl conn(attachment);
				attachment->att_trace_manager->event_attach(&conn, false, res_successful);
			}

			if (!(attachment->att_flags & ATT_no_db_triggers))
			{
				jrd_tra* transaction = NULL;
				const ULONG save_flags = attachment->att_flags;

				try
				{
					// load all database triggers
					MET_load_db_triggers(tdbb, DB_TRIGGER_CONNECT);
					MET_load_db_triggers(tdbb, DB_TRIGGER_DISCONNECT);
					MET_load_db_triggers(tdbb, DB_TRIGGER_TRANS_START);
					MET_load_db_triggers(tdbb, DB_TRIGGER_TRANS_COMMIT);
					MET_load_db_triggers(tdbb, DB_TRIGGER_TRANS_ROLLBACK);

					// load DDL triggers
					MET_load_ddl_triggers(tdbb);

					const trig_vec* trig_connect = attachment->att_triggers[DB_TRIGGER_CONNECT];
					if (trig_connect && !trig_connect->isEmpty())
					{
						// Start a transaction to execute ON CONNECT triggers.
						// Ensure this transaction can't trigger auto-sweep.
						//// TODO: register the transaction in y-valve - for external engines
						attachment->att_flags |= ATT_no_cleanup;
						transaction = TRA_start(tdbb, 0, NULL);
						attachment->att_flags = save_flags;

						// run ON CONNECT triggers
						EXE_execute_db_triggers(tdbb, transaction, jrd_req::req_trigger_connect);

						// and commit the transaction
						TRA_commit(tdbb, transaction, false);
					}
				}
				catch (const Exception&)
				{
					attachment->att_flags = save_flags;
					if (!(dbb->dbb_flags & DBB_bugcheck) && transaction)
						TRA_rollback(tdbb, transaction, false, false);
					throw;
				}
			}

			// guardDatabases.leave();

			return jAtt;
		}	// try
		catch (const Exception& ex)
		{
			const ISC_STATUS exc = ex.stuffException(user_status);
			const bool no_priv = (exc == isc_login || exc == isc_no_priv);
			trace_failed_attach(attachment ? attachment->att_trace_manager : NULL,
				filename, options, false, no_priv);

			dbb->dbb_sync.lock(NULL, SYNC_EXCLUSIVE);
			dbbGuard.unlock();

			if (attachment)
				attachment->att_interface = NULL;

			unwindAttach(tdbb, ex, user_status, attachment, dbb);
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
	}

	return NULL;
}


void JBlob::getInfo(IStatus* user_status,
				   unsigned int itemsLength, const unsigned char* items,
				   unsigned int bufferLength, unsigned char* buffer)
{
/**************************************
 *
 *	g d s _ $ b l o b _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on blob object.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			INF_blob_info(getHandle(), itemsLength, items, bufferLength, buffer);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JBlob::cancel(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	freeEngineData(user_status);
	if (user_status->isSuccess())
	{
		release();
	}
}


void JBlob::freeEngineData(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			getHandle()->BLB_cancel(tdbb);
			blob = NULL;
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JEvents::cancel(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ e v e n t s
 *
 **************************************
 *
 * Functional description
 *	Cancel an outstanding event.
 *
 **************************************/
	freeEngineData(user_status);
	if (user_status->isSuccess())
	{
		release();
	}
}


void JEvents::freeEngineData(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ e v e n t s
 *
 **************************************
 *
 * Functional description
 *	Cancel an outstanding event.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			Database* const dbb = tdbb->getDatabase();

			if (dbb->dbb_event_mgr)
			{
				dbb->dbb_event_mgr->cancelEvents(id);
			}

			id = -1;
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JAttachment::cancelOperation(IStatus* user_status, int option)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ o p e r a t i o n
 *
 **************************************
 *
 * Functional description
 *	Try to cancel an operation.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this, true);

		try
		{
			JRD_cancel_operation(tdbb, getHandle(), option);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JBlob::close(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c l o s e _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			getHandle()->BLB_close(tdbb);
			blob = NULL;
			release();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::commit(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c o m m i t
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			JRD_commit_transaction(tdbb, getHandle());
			transaction = NULL;
			release();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::commitRetaining(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ c o m m i t _ r e t a i n i n g
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			JRD_commit_retaining(tdbb, getHandle());
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


ITransaction* FB_CARG JTransaction::join(IStatus* user_status, ITransaction* transaction)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		return DtcInterfacePtr()->join(user_status, this, transaction);
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
	}
	return NULL;
}

JTransaction* FB_CARG JTransaction::validate(IStatus* user_status, IAttachment* testAtt)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		// Do not raise error in status - just return NULL if attachment does not match
		return jAtt == testAtt ? this : NULL;
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
	}
	return NULL;
}

JTransaction* FB_CARG JTransaction::enterDtc(IStatus* user_status)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		JTransaction* copy = new JTransaction(this);
		copy->addRef();

		transaction = NULL;
		release();

		return copy;
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
	}
	return NULL;
}

JRequest* JAttachment::compileRequest(IStatus* user_status,
	unsigned int blr_length, const unsigned char* blr)
{
/**************************************
 *
 *	g d s _ $ c o m p i l e
 *
 **************************************
 *
 * Functional description
 *
 **************************************/
	JrdStatement* stmt = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			TraceBlrCompile trace(tdbb, blr_length, blr);
			try
			{
				jrd_req* request = NULL;
				JRD_compile(tdbb, getHandle(), &request, blr_length, blr, RefStrPtr(), 0, NULL, false);
				stmt = request->getStatement();

				trace.finish(request, res_successful);
			}
			catch (const Exception& ex)
			{
				const ISC_STATUS exc = transliterateException(tdbb, ex, user_status);
				const bool no_priv = (exc == isc_no_priv);
				trace.finish(NULL, no_priv ? res_unauthorized : res_failed);

				return NULL;
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JRequest* jr = new JRequest(stmt, this);
	stmt->interface = jr;
	jr->addRef();
	return jr;
}


JBlob* JAttachment::createBlob(IStatus* user_status, ITransaction* tra, ISC_QUAD* blob_id,
	unsigned int bpb_length, const unsigned char* bpb)
{
/**************************************
 *
 *	g d s _ $ c r e a t e _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Create a new blob.
 *
 **************************************/
	blb* blob = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		validateHandle(tdbb, getEngineTransaction(user_status, tra));

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_segstr_wrong_db);
			blob = BLB_create2(tdbb, transaction, reinterpret_cast<bid*>(blob_id), bpb_length, bpb);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		 ex.stuffException(user_status);
		 return NULL;
	}

	successful_completion(user_status);

	JBlob* jb = new JBlob(blob, this);
	jb->addRef();
	blob->blb_interface = jb;
	return jb;
}


JAttachment* FB_CARG JProvider::createDatabase(IStatus* user_status, const char* filename,
	unsigned int dpb_length, const unsigned char* dpb)
{
/**************************************
 *
 *	g d s _ $ c r e a t e _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Create a nice, squeeky clean database, uncorrupted by user data.
 *
 **************************************/
	try
	{
		ThreadContextHolder tdbb(user_status);

		UserId userId;
		DatabaseOptions options;
		PathName file_name, expanded_name;
		bool is_alias = false;
		Firebird::RefPtr<Config> config;

		try
		{
			// Process database parameter block
			bool invalid_client_SQL_dialect = false;
			options.get(dpb, dpb_length, invalid_client_SQL_dialect);
			if (!invalid_client_SQL_dialect && options.dpb_sql_dialect == 99) {
				options.dpb_sql_dialect = 0;
			}

			if (options.dpb_org_filename.hasData())
				file_name = options.dpb_org_filename;
			else
			{
				file_name = filename;

				if (!options.dpb_utf8_filename)
					ISC_systemToUtf8(file_name);

				ISC_unescape(file_name);
			}

			ISC_utf8ToSystem(file_name);

			// Resolve given alias name
			is_alias = ResolveDatabaseAlias(file_name, expanded_name, &config);
			if (is_alias)
			{
				ISC_systemToUtf8(expanded_name);
				ISC_unescape(expanded_name);
				ISC_utf8ToSystem(expanded_name);
				ISC_expand_filename(expanded_name, false);
			}
			else
			{
				expanded_name = filename;

				if (!options.dpb_utf8_filename)
					ISC_systemToUtf8(expanded_name);

				ISC_unescape(expanded_name);
				ISC_utf8ToSystem(expanded_name);
			}

			// Check to see if the database is truly local or if it just looks
			// that way
			if (ISC_check_if_remote(expanded_name, true))
			{
				handle_error(user_status, isc_unavailable);
			}

			// Check for correct credentials supplied
			getUserInfo(userId, options, &config);
		}
		catch (const Exception&)
		{
			trace_failed_attach(NULL, filename, options, true, true);
			throw;
		}

		// Check database against conf file.
		const VdnResult vdn = verifyDatabaseName(expanded_name, tdbb->tdbb_status_vector, is_alias);
		if (!is_alias && vdn == VDN_FAIL)
		{
			trace_failed_attach(NULL, filename, options, true, false);
			status_exception::raise(tdbb->tdbb_status_vector);
		}

		Database* dbb = NULL;
		MutexEnsureUnlock guardDatabases(databases_mutex);
		guardDatabases.enter();

		dbb = init(tdbb, expanded_name, config, false);
		fb_assert(dbb);
		Sync dbbGuard(&dbb->dbb_sync, "createDatabase");
		dbbGuard.lock(SYNC_EXCLUSIVE);

		tdbb->setDatabase(dbb);
		DatabaseContextHolder dbbHolder(tdbb);

		dbb->dbb_flags |= (DBB_being_opened | options.dpb_flags);

		Jrd::Attachment* attachment = NULL;

		bool initing_security = false;

		try {

			if (options.dpb_key.hasData())
			{
				dbb->dbb_encrypt_key = options.dpb_key;
			}

			attachment = Jrd::Attachment::create(dbb);

			RefPtr<JAttachment> jAtt(new JAttachment(attachment));
			jAtt->addRef();
			attachment->att_interface = jAtt;
			MutexLockGuard guard(*(jAtt->getMutex()));

			tdbb->setAttachment(attachment);
			attachment->att_filename = is_alias ? file_name : expanded_name;
			attachment->att_network_protocol = options.dpb_network_protocol;
			attachment->att_remote_address = options.dpb_remote_address;
			attachment->att_remote_pid = options.dpb_remote_pid;
			attachment->att_remote_process = options.dpb_remote_process;
			attachment->att_ext_call_depth = options.dpb_ext_call_depth;
			attachment->att_next = dbb->dbb_attachments;

			dbb->dbb_attachments = attachment;
			dbb->dbb_flags &= ~DBB_being_opened;

			if (options.dpb_working_directory.hasData()) {
				attachment->att_working_directory = options.dpb_working_directory;
			}

			if (options.dpb_gbak_attach) {
				attachment->att_flags |= ATT_gbak_attachment;
			}

			if (options.dpb_no_db_triggers)
				attachment->att_flags |= ATT_no_db_triggers;

			switch (options.dpb_sql_dialect)
			{
			case 0:
				// This can be issued by QLI, GDEF and old BDE clients.
				// In this case assume dialect 1
				options.dpb_sql_dialect = SQL_DIALECT_V5;
			case SQL_DIALECT_V5:
				break;
			case SQL_DIALECT_V6:
				dbb->dbb_flags |= DBB_DB_SQL_dialect_3;
				break;
			default:
				ERR_post(Arg::Gds(isc_database_create_failed) << Arg::Str(expanded_name) <<
						 Arg::Gds(isc_inv_dialect_specified) << Arg::Num(options.dpb_sql_dialect) <<
						 Arg::Gds(isc_valid_db_dialects) << Arg::Str("1 and 3"));
				break;
			}

			attachment->att_client_charset = attachment->att_charset = options.dpb_interp;

			if (!options.dpb_page_size) {
				options.dpb_page_size = DEFAULT_PAGE_SIZE;
			}

			USHORT page_size = MIN_NEW_PAGE_SIZE;
			for (; page_size < MAX_PAGE_SIZE; page_size <<= 1)
			{
				if (options.dpb_page_size < page_size << 1)
					break;
			}

			dbb->dbb_page_size = (page_size > MAX_PAGE_SIZE) ? MAX_PAGE_SIZE : page_size;

			TRA_init(attachment);

			initing_security = false;

			PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
			try
			{
				// try to create with overwrite = false
				pageSpace->file = PIO_create(dbb, expanded_name, false, false, false);
			}
			catch (status_exception)
			{
				if (options.dpb_overwrite)
				{
					JAttachment* attachment2 = attachDatabase(user_status, filename, dpb_length, dpb);
					if (user_status->get()[1] == isc_adm_task_denied)
					{
						throw;
					}

					bool allow_overwrite = false;

					if (attachment2)
					{
						allow_overwrite = attachment2->getHandle()->att_user->locksmith();
						attachment2->detach(user_status);
					}
					else
					{
						// clear status after failed attach
						user_status->init();
						allow_overwrite = true;
					}

					if (allow_overwrite)
					{
						// file is a database and the user (SYSDBA or owner) has right to overwrite
						pageSpace->file = PIO_create(dbb, expanded_name, options.dpb_overwrite, false, false);
					}
					else
					{
						ERR_post(Arg::Gds(isc_no_priv) << Arg::Str("overwrite") <<
														  Arg::Str("database") <<
														  Arg::Str(expanded_name));
					}
				}
				else
					throw;
			}

			const jrd_file* const first_dbb_file = pageSpace->file;

			// Initialize the lock manager
			dbb->dbb_lock_mgr = LockManager::create(dbb->getUniqueFileId(), dbb->dbb_config);

			LCK_init(tdbb, LCK_OWNER_database);
			dbb->dbb_flags |= DBB_lck_init_done;

			LCK_init(tdbb, LCK_OWNER_attachment);
			attachment->att_flags |= ATT_lck_init_done;

			// Initialize locks
			init_database_locks(tdbb);

			INI_init(tdbb);
			PAG_init(tdbb);
			initing_security = true;

			SCL_init(tdbb, true, userId);

			if (options.dpb_set_page_buffers)
				dbb->dbb_page_buffers = options.dpb_page_buffers;

			options.setBuffers(dbb->dbb_config);
			CCH_init(tdbb, options.dpb_buffers,
				config->getSharedCache() && !config->getSharedDatabase());

#ifdef WIN_NT
			dbb->dbb_filename.assign(first_dbb_file->fil_string);
#else
			dbb->dbb_filename = expanded_name;
#endif

			// NS: Use alias as database ID only if accessing database using file name is not possible.
			//
			// This way we:
			// 1. Ensure uniqueness of ID even in presence of multiple processes
			// 2. Make sure that ID value can be used to connect back to database
			//
			if (is_alias && vdn == VDN_FAIL)
				dbb->dbb_database_name = file_name;
			else
				dbb->dbb_database_name = dbb->dbb_filename;

			dbb->dbb_tip_cache = FB_NEW(*dbb->dbb_permanent) TipCache(dbb);

			// Initialize backup difference subsystem. This must be done before WAL and shadowing
			// is enabled because nbackup it is a lower level subsystem
			dbb->dbb_backup_manager = FB_NEW(*dbb->dbb_permanent) BackupManager(tdbb, dbb, nbak_state_normal);
			dbb->dbb_backup_manager->dbCreating = true;

			PAG_format_header(tdbb);
			INI_init2(tdbb);
			PAG_format_pip(tdbb, *pageSpace);

			if (options.dpb_set_page_buffers)
				PAG_set_page_buffers(tdbb, options.dpb_page_buffers);

			if (options.dpb_set_no_reserve)
				PAG_set_no_reserve(tdbb, options.dpb_no_reserve);

			INI_format(attachment->att_user->usr_user_name.c_str(), options.dpb_set_db_charset.c_str());

			// There is no point to move database online at database creation since it is online by default.
			// We do not allow to create database that is fully shut down.
			if (options.dpb_online || (options.dpb_shutdown & isc_dpb_shut_mode_mask) == isc_dpb_shut_full)
				ERR_post(Arg::Gds(isc_bad_shutdown_mode) << Arg::Str(file_name));

			if (options.dpb_shutdown) {
				SHUT_database(tdbb, options.dpb_shutdown, options.dpb_shutdown_delay);
			}

			if (options.dpb_sweep_interval != -1)
			{
				PAG_sweep_interval(tdbb, options.dpb_sweep_interval);
				dbb->dbb_sweep_interval = options.dpb_sweep_interval;
			}

			if (options.dpb_set_force_write)
				PAG_set_force_write(tdbb, options.dpb_force_write);

			// initialize shadowing semaphore as soon as the database is ready for it
			// but before any real work is done

			SDW_init(tdbb, options.dpb_activate_shadow, options.dpb_delete_shadow);
			CCH_init2(tdbb);
			VIO_init(tdbb);

			if (options.dpb_set_db_readonly)
			{
				if (!CCH_exclusive (tdbb, LCK_EX, WAIT_PERIOD))
				{
					ERR_post(Arg::Gds(isc_lock_timeout) <<
							 Arg::Gds(isc_obj_in_use) << Arg::Str(file_name));
				}

				PAG_set_db_readonly(tdbb, options.dpb_db_readonly);
			}

			PAG_attachment_id(tdbb);

			CCH_release_exclusive(tdbb);

			// Figure out what character set & collation this attachment prefers

			find_intl_charset(tdbb, attachment, &options);

			CCH_flush(tdbb, FLUSH_FINI, 0);

			dbb->dbb_backup_manager->dbCreating = false;

			// Report that we created attachment to Trace API
			if (attachment->att_trace_manager->needs(TRACE_EVENT_ATTACH))
			{
				TraceConnectionImpl conn(attachment);
				attachment->att_trace_manager->event_attach(&conn, true, res_successful);
			}

			guardDatabases.leave();

			return jAtt;
		}	// try
		catch (const Exception& ex)
		{
			const ISC_STATUS exc = ex.stuffException(user_status);
			const bool no_priv = (exc == isc_login || exc == isc_no_priv);
			trace_failed_attach(attachment ? attachment->att_trace_manager : NULL,
				filename, options, true, no_priv);

			dbb->dbb_sync.lock(NULL, SYNC_EXCLUSIVE);
			dbbGuard.unlock();

			if (attachment)
				attachment->att_interface = NULL;

			unwindAttach(tdbb, ex, user_status, attachment, dbb);
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
	}

	return NULL;
}


void JAttachment::getInfo(IStatus* user_status, unsigned int item_length, const unsigned char* items,
	unsigned int buffer_length, unsigned char* buffer)
{
/**************************************
 *
 *	g d s _ $ d a t a b a s e _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on database object.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			INF_database_info(tdbb, item_length, items, buffer_length, buffer);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JAttachment::ddl(IStatus* status, ITransaction* /*tra*/, unsigned int /*length*/,
	const unsigned char* /*dyn*/)
{
/**************************************
 *
 *	g d s _ $ d d l
 *
 **************************************
 *
 * This function is deprecated and "removed".
 *
 **************************************/
	status->set((Arg::Gds(isc_feature_deprecated) << Arg::Str("isc_ddl")).value());
}


void JAttachment::detach(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a database.
 *
 **************************************/
	freeEngineData(user_status);
	if (user_status->isSuccess())
	{
		release();
	}
}


void JAttachment::freeEngineData(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a database.
 *
 **************************************/
	try
	{
		MutexLockGuard guard(databases_mutex);
		EngineContextHolder tdbb(user_status, this, true);

		try
		{
			if (getHandle()->att_in_use)
				status_exception::raise(Arg::Gds(isc_attachment_in_use));

			JRD_cancel_operation(tdbb, getHandle(), fb_cancel_raise);

			MutexLockGuard guard(*getMutex());
			{
				while (att->att_use_count)
				{
					MutexUnlockGuard cout(*getMutex());
					THD_sleep(10);
				}
			}

			Database* dbb = tdbb->getDatabase();

			// if this is the last attachment, mark dbb as not in use
			{
				SyncLockGuard sync(&dbb->dbb_sync, SYNC_SHARED, "JAttachment::freeEngineData");

				if (dbb->dbb_attachments == getHandle() && !getHandle()->att_next &&
					!(dbb->dbb_flags & DBB_being_opened))
				{
					dbb->dbb_flags |= DBB_not_in_use;
				}
			}

			try
			{
				// Purge attachment, don't rollback open transactions
				getHandle()->att_flags |= ATT_cancel_disable;
				purge_attachment(tdbb, getHandle(), false);
			}
			catch (const Exception&)
			{
				dbb->dbb_flags &= ~DBB_not_in_use;
				throw;
			}

			att = NULL;
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JAttachment::drop(IStatus* user_status)
{
/**************************************
 *
 *	i s c _ d r o p _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Close down and purge a database.
 *
 **************************************/
	try
	{
		MutexLockGuard guard(databases_mutex);
		EngineContextHolder tdbb(user_status, this, true);

		try
		{
			if (getHandle()->att_in_use)
				status_exception::raise(Arg::Gds(isc_attachment_in_use));

			JRD_cancel_operation(tdbb, getHandle(), fb_cancel_raise);

			MutexLockGuard guard(*getMutex());

			Database* const dbb = tdbb->getDatabase();

			const PathName& file_name = getHandle()->att_filename;

			if (!getHandle()->locksmith())
			{
				ERR_post(Arg::Gds(isc_no_priv) << Arg::Str("drop") <<
												  Arg::Str("database") <<
												  Arg::Str(file_name));
			}

			if (getHandle()->att_flags & ATT_shutdown)
			{
				if (dbb->dbb_ast_flags & DBB_shutdown)
				{
					ERR_post(Arg::Gds(isc_shutdown) << Arg::Str(file_name));
				}
				else
				{
					ERR_post(Arg::Gds(isc_att_shutdown));
				}
			}

			if (!CCH_exclusive(tdbb, LCK_PW, WAIT_PERIOD))
			{
				ERR_post(Arg::Gds(isc_lock_timeout) <<
						 Arg::Gds(isc_obj_in_use) << Arg::Str(file_name));
			}

			// Check if same process has more attachments

			if (dbb->dbb_attachments && dbb->dbb_attachments->att_next)
			{
				ERR_post(Arg::Gds(isc_no_meta_update) <<
						 Arg::Gds(isc_obj_in_use) << Arg::Str("DATABASE"));
			}

			dbb->dbb_extManager.closeAttachment(tdbb, getHandle());

			// Forced release of all transactions
			purge_transactions(tdbb, getHandle(), true, getHandle()->att_flags);

			getHandle()->att_flags |= ATT_cancel_disable;

			// Here we have database locked in exclusive mode.
			// Just mark the header page with an 0 ods version so that no other
			// process can attach to this database once we release our exclusive
			// lock and start dropping files.

	   		WIN window(HEADER_PAGE_NUMBER);
			Ods::header_page* header = (Ods::header_page*) CCH_FETCH(tdbb, &window, LCK_write, pag_header);
			CCH_MARK_MUST_WRITE(tdbb, &window);
			header->hdr_ods_version = 0;
			CCH_RELEASE(tdbb, &window);

			// This point on database is useless
			// mark the dbb unusable

			dbb->dbb_flags |= DBB_not_in_use;

			PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
			const jrd_file* file = pageSpace->file;
			const Shadow* shadow = dbb->dbb_shadow;

			// Notify Trace API manager about successful drop of database
			if (getHandle()->att_trace_manager->needs(TRACE_EVENT_DETACH))
			{
				TraceConnectionImpl conn(getHandle());
				getHandle()->att_trace_manager->event_detach(&conn, true);
			}

			// Unlink attachment from database
			release_attachment(tdbb, getHandle());
			att = NULL;

			shutdown_database(dbb, false);

			// drop the files here
			bool err = drop_files(file);
			for (; shadow; shadow = shadow->sdw_next)
			{
				err = err || drop_files(shadow->sdw_file);
			}

			tdbb->setDatabase(NULL);
			Database::destroy(dbb);

			if (err)
			{
				user_status->set(Arg::Gds(isc_drdb_completed_with_errs).value());
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


unsigned int JBlob::getSegment(IStatus* user_status, unsigned int buffer_length, void* buffer)
{
/**************************************
 *
 *	g d s _ $ g e t _ s e g m e n t
 *
 **************************************
 *
 * Functional description
 *	Get a segment from a blob.
 *
 **************************************/
	unsigned int len = 0;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			len = getHandle()->BLB_get_segment(tdbb, buffer, buffer_length);

			if (getHandle()->blb_flags & BLB_eof)
				status_exception::raise(Arg::Gds(isc_segstr_eof));
			else if (getHandle()->blb_fragment_size)
				status_exception::raise(Arg::Gds(isc_segment));
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return len;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return len;
	}

	successful_completion(user_status);

	return len;
}


int JAttachment::getSlice(IStatus* user_status, ITransaction* tra, ISC_QUAD* array_id,
	unsigned int /*sdl_length*/, const unsigned char* sdl, unsigned int param_length,
	const unsigned char* param, int slice_length, unsigned char* slice)
{
/**************************************
 *
 *	g d s _ $ g e t _ s l i c e
 *
 **************************************
 *
 * Functional description
 *	Snatch a slice of an array.
 *
 **************************************/
	int return_length = 0;

	try
	{
		EngineContextHolder tdbb(user_status, this);

		validateHandle(tdbb, getEngineTransaction(user_status, tra));

		check_database(tdbb);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_segstr_wrong_db);

			if (!array_id->gds_quad_low && !array_id->gds_quad_high)
				MOVE_CLEAR(slice, slice_length);
			else
			{
				return_length = BLB_get_slice(tdbb, transaction, reinterpret_cast<bid*>(array_id),
											  sdl, param_length, param, slice_length, slice);
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return return_length;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return return_length;
	}

	successful_completion(user_status);

	return return_length;
}


JBlob* JAttachment::openBlob(IStatus* user_status, ITransaction* tra, ISC_QUAD* blob_id,
	unsigned int bpb_length, const unsigned char* bpb)
{
/**************************************
 *
 *	g d s _ $ o p e n _ b l o b 2
 *
 **************************************
 *
 * Functional description
 *	Open an existing blob.
 *
 **************************************/
	blb* blob = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);

		validateHandle(tdbb, getEngineTransaction(user_status, tra));

		check_database(tdbb);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_segstr_wrong_db);
			blob = BLB_open2(tdbb, transaction, reinterpret_cast<bid*>(blob_id),
				bpb_length, bpb, true);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JBlob* jb = new JBlob(blob, this);
	jb->addRef();
	blob->blb_interface = jb;
	return jb;
}


void JTransaction::prepare(IStatus* user_status, unsigned int msg_length, const unsigned char* msg)
{
/**************************************
 *
 *	g d s _ $ p r e p a r e
 *
 **************************************
 *
 * Functional description
 *	Prepare a transaction for commit.  First phase of a two
 *	phase commit.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			prepare_tra(tdbb, getHandle(), msg_length, msg);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JBlob::putSegment(IStatus* user_status, unsigned int buffer_length, const void* buffer)
{
/**************************************
 *
 *	g d s _ $ p u t _ s e g m e n t
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			getHandle()->BLB_put_segment(tdbb, buffer, buffer_length);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JAttachment::putSlice(IStatus* user_status, ITransaction* tra, ISC_QUAD* array_id,
	unsigned int /*sdlLength*/, const unsigned char* sdl, unsigned int paramLength,
	const unsigned char* param, int sliceLength, unsigned char* slice)
{
/**************************************
 *
 *	g d s _ $ p u t _ s l i c e
 *
 **************************************
 *
 * Functional description
 *	Snatch a slice of an array.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);

		validateHandle(tdbb, getEngineTransaction(user_status, tra));

		check_database(tdbb);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_segstr_wrong_db);
			BLB_put_slice(tdbb, transaction, reinterpret_cast<bid*>(array_id),
				sdl, paramLength, param, sliceLength, slice);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


JEvents* JAttachment::queEvents(IStatus* user_status, Firebird::IEventCallback* callback,
	unsigned int length, const unsigned char* events)
{
/**************************************
 *
 *	g d s _ $ q u e _ e v e n t s
 *
 **************************************
 *
 * Functional description
 *	Que a request for event notification.
 *
 **************************************/
	JEvents* ev = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			Database* const dbb = tdbb->getDatabase();
			Lock* const lock = dbb->dbb_lock;

			EventManager::init(getHandle());

			int id = dbb->dbb_event_mgr->queEvents(getHandle()->att_event_session,
												   lock->lck_length, (const TEXT*) &lock->lck_key,
												   length, events, callback);
			ev = new JEvents(id, this);
			ev->addRef();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return ev;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return ev;
	}

	successful_completion(user_status);

	return ev;
}


void JRequest::receive(IStatus* user_status, int level, unsigned int msg_type,
					   unsigned int msg_length, unsigned char* msg)
{
/**************************************
 *
 *	g d s _ $ r e c e i v e
 *
 **************************************
 *
 * Functional description
 *	Send a record to the host program.
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		jrd_req* request = verify_request_synchronization(getHandle(), level);
		check_transaction(tdbb, request->req_transaction);

		try
		{
			JRD_receive(tdbb, request, msg_type, msg_length, msg);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


JTransaction* JAttachment::reconnectTransaction(IStatus* user_status, unsigned int length,
	const unsigned char* id)
{
/**************************************
 *
 *	g d s _ $ r e c o n n e c t
 *
 **************************************
 *
 * Functional description
 *	Connect to a transaction in limbo.
 *
 **************************************/
	jrd_tra* tra = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			tra = TRA_reconnect(tdbb, id, length);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JTransaction* jt = new JTransaction(tra, this);
	tra->setInterface(jt);
	jt->addRef();
	return jt;
}


void JRequest::free(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ r e l e a s e _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	Release a request.
 *
 **************************************/
	freeEngineData(user_status);
	if (user_status->isSuccess())
	{
		release();
	}
}


void JRequest::freeEngineData(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ r e l e a s e _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	Release a request.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			getHandle()->release(tdbb);
			rq = NULL;
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JRequest::getInfo(IStatus* user_status, int level, unsigned int itemsLength,
	const unsigned char* items, unsigned int bufferLength, unsigned char* buffer)
{
/**************************************
 *
 *	g d s _ $ r e q u e s t _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on blob object.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		jrd_req* request = verify_request_synchronization(getHandle(), level);

		try
		{
			INF_request_info(request, itemsLength, items, bufferLength, buffer);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::rollbackRetaining(IStatus* user_status)
{
/**************************************
 *
 *	i s c _ r o l l b a c k _ r e t a i n i n g
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction but keep the environment valid
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			JRD_rollback_retaining(tdbb, getHandle());
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::rollback(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ r o l l b a c k
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			JRD_rollback_transaction(tdbb, getHandle());
			transaction = NULL;
			release();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::disconnect(IStatus* user_status)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		// ASF: Looks wrong that this method is ignored in the engine and remote providers.
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


int JBlob::seek(IStatus* user_status, int mode, int offset)
{
/**************************************
 *
 *	g d s _ $ s e e k _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Seek a stream blob.
 *
 **************************************/
	int result = -1;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			result = getHandle()->BLB_lseek(mode, offset);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return result;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return result;
	}

	successful_completion(user_status);

	return result;
}


void JRequest::send(IStatus* user_status, int level, unsigned int msg_type,
	unsigned int msg_length, const unsigned char* msg)
{
/**************************************
 *
 *	g d s _ $ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		jrd_req* request = verify_request_synchronization(getHandle(), level);
		check_transaction(tdbb, request->req_transaction);

		try
		{
			JRD_send(tdbb, request, msg_type, msg_length, msg);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


JService* JProvider::attachServiceManager(IStatus* user_status, const char* service_name,
										  unsigned int spbLength, const unsigned char* spb)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ a t t a c h
 *
 **************************************
 *
 * Functional description
 *	Connect to a Firebird service.
 *
 **************************************/
	JService* svc = NULL;

	try
	{
		ThreadContextHolder tdbb(user_status);

		svc = new JService(new Service(service_name, spbLength, spb));
		svc->addRef();
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return svc;
	}

	successful_completion(user_status);

	return svc;
}


void JService::detach(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a service.
 *
 **************************************/
	freeEngineData(user_status);
	if (user_status->isSuccess())
	{
		release();
	}
}


void JService::freeEngineData(IStatus* user_status)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a service.
 *
 **************************************/
	try
	{
		ThreadContextHolder tdbb(user_status);

		validateHandle(svc);

		svc->detach();
		svc = NULL;
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JService::query(IStatus* user_status,
				unsigned int sendLength, const unsigned char* sendItems,
				unsigned int receiveLength, const unsigned char* receiveItems,
				unsigned int bufferLength, unsigned char* buffer)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ q u e r y
 *
 **************************************
 *
 * Functional description
 *	Provide information on service object.
 *
 *	NOTE: The parameter RESERVED must not be used
 *	for any purpose as there are networking issues
 *	involved (as with any handle that goes over the
 *	network).  This parameter will be implemented at
 *	a later date.
 *
 **************************************/
	try
	{
		ThreadContextHolder tdbb(user_status);

		validateHandle(svc);

		if (svc->getVersion() == isc_spb_version1)
		{
			svc->query(sendLength, sendItems, receiveLength,
					   receiveItems, bufferLength, buffer);
		}
		else
		{
			// For SVC_query2, we are going to completly dismantle user_status (since at this point it is
			// meaningless anyway).  The status vector returned by this function can hold information about
			// the call to query the service manager and/or a service thread that may have been running.

			svc->query2(tdbb, sendLength, sendItems, receiveLength,
					    receiveItems, bufferLength, buffer);

			// If there is a status vector from a service thread, copy it into the thread status
			size_t len, warning;
			PARSE_STATUS(svc->getStatus(), len, warning);

			if (len)
			{
				user_status->set(len, svc->getStatus());
				// Empty out the service status vector
				svc->initStatus();
				return;
			}
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JService::start(IStatus* user_status, unsigned int spbLength, const unsigned char* spb)
{
/**************************************
 *
 *	g d s _ s e r v i c e _ s t a r t
 *
 **************************************
 *
 * Functional description
 *	Start the specified service
 *
 *	NOTE: The parameter RESERVED must not be used
 *	for any purpose as there are networking issues
 *  	involved (as with any handle that goes over the
 *   	network).  This parameter will be implemented at
 * 	a later date.
 **************************************/
	try
	{
		ThreadContextHolder tdbb(user_status);

		validateHandle(svc);

		svc->start(spbLength, spb);

		if (svc->getStatus()[1])
		{
			user_status->set(svc->getStatus());
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JRequest::startAndSend(IStatus* user_status, Firebird::ITransaction* tra, int level,
	unsigned int msg_type, unsigned int msg_length, const unsigned char* msg)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ a n d _ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);

		validateHandle(tdbb, getAttachment()->getEngineTransaction(user_status, tra));

		check_database(tdbb);

		jrd_req* request = getHandle()->getRequest(tdbb, level);
		check_transaction(tdbb, request->req_transaction);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_req_wrong_db);

			TraceBlrExecute trace(tdbb, request);
			try
			{
				JRD_start_and_send(tdbb, request, transaction, msg_type, msg_length, msg);

				// Notify Trace API about blr execution
				trace.finish(res_successful);
			}
			catch (const Exception& ex)
			{
				const ISC_STATUS exc = transliterateException(tdbb, ex, user_status);
				const bool no_priv = (exc == isc_login || exc == isc_no_priv);
				trace.finish(no_priv ? res_unauthorized : res_failed);

				return;
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JRequest::start(IStatus* user_status, Firebird::ITransaction* tra, int level)
{
/**************************************
 *
 *	g d s _ $ s t a r t
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);

		if (!tra)
			status_exception::raise(Arg::Gds(isc_bad_trans_handle));

		validateHandle(tdbb, getAttachment()->getEngineTransaction(user_status, tra));

		check_database(tdbb);

		jrd_req* request = getHandle()->getRequest(tdbb, level);
		check_transaction(tdbb, request->req_transaction);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_req_wrong_db);

			TraceBlrExecute trace(tdbb, request);
			try
			{
				JRD_start(tdbb, request, transaction);
				trace.finish(res_successful);
			}
			catch (const Exception& ex)
			{
				const ISC_STATUS exc = transliterateException(tdbb, ex, user_status);
				const bool no_priv = (exc == isc_login || exc == isc_no_priv);
				trace.finish(no_priv ? res_unauthorized : res_failed);

				return;
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


class CounterGuard
{
public:
	explicit CounterGuard(AtomicCounter& pc)
		: counter(&pc)
	{
		for(;;)
		{
			if (counter->exchangeAdd(1) == 0)
			{
				break;
			}
			counter->exchangeAdd(-1);
			THD_sleep(1);
		}
	}

	~CounterGuard()
	{
		counter->exchangeAdd(-1);
	}

private:
	AtomicCounter* counter;
};


void JProvider::shutdown(IStatus* status, unsigned int timeout, const int reason)
{
/**************************************
 *
 *	G D S _ S H U T D O W N
 *
 **************************************
 *
 * Functional description
 *	Rollback every transaction, release
 *	every attachment, and shutdown every
 *	database.
 *
 **************************************/
	static AtomicCounter shutCounter;
	static bool shutdownComplete = false;

	try
	{
		CounterGuard guard(shutCounter);

		if (shutdownComplete)
		{
			return;
		}
		shutdownComplete = true;

		ThreadContextHolder tdbb;

		ULONG attach_count, database_count, svc_count;
		JRD_enum_attachments(NULL, attach_count, database_count, svc_count);

		if (attach_count > 0 || svc_count > 0)
		{
			gds__log("Shutting down the server with %d active connection(s) to %d database(s), "
					 "%d active service(s)",
				attach_count, database_count, svc_count);
		}

		if (reason == fb_shutrsn_exit_called)
		{
			// Starting threads may fail when task is going to close.
			// This happens at least with some microsoft C runtimes.
			// If people wish to have timeout, they should better call fb_shutdown() themselves.
			// Therefore:
			timeout = 0;
		}

		if (timeout)
		{
			Semaphore shutdown_semaphore;

			Thread::Handle h;
			Thread::start(shutdown_thread, &shutdown_semaphore, THREAD_medium, &h);

			if (!shutdown_semaphore.tryEnter(0, timeout))
			{
				// sad, but we MUST kill shutdown_thread because engine DLL\SO is unloaded
				// else whole process will be crashed
				Thread::kill(h);
				status_exception::raise(Arg::Gds(isc_shutdown_timeout));
			}

			Thread::waitForCompletion(h);
		}
		else
		{
			shutdown_thread(NULL);
		}

		// Do not put it into separate shutdown thread - during shutdown of TraceManager
		// PluginManager wants to lock a mutex, which is sometimes already locked in current thread
		TraceManager::shutdown();
	}
	catch (const Exception& ex)
	{
		ex.stuffException(status);
		gds__log_status(NULL, status->get());
	}
}


JTransaction* JAttachment::startTransaction(IStatus* user_status,
	unsigned int tpbLength, const unsigned char* tpb)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	jrd_tra* tra = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		start_transaction(tdbb, true, &tra, getHandle(), tpbLength, tpb);
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JTransaction* jt = new JTransaction(tra, this);
	tra->setInterface(jt);
	jt->addRef();
	return jt;
}


void JAttachment::transactRequest(IStatus* user_status, ITransaction* tra,
	unsigned int blr_length, const unsigned char* blr,
	unsigned int in_msg_length, const unsigned char* in_msg,
	unsigned int out_msg_length, unsigned char* out_msg)
{
/**************************************
 *
 *	i s c _ t r a n s a c t _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	Execute a procedure.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);

		validateHandle(tdbb, getEngineTransaction(user_status, tra));

		check_database(tdbb);

		try
		{
			jrd_tra* const transaction = find_transaction(tdbb, isc_req_wrong_db);
			Jrd::Attachment* const att = transaction->tra_attachment;

			const MessageNode* inMessage = NULL;
			const MessageNode* outMessage = NULL;

			jrd_req* request = NULL;
			MemoryPool* new_pool = att->createPool();

			try
			{
				Jrd::ContextPoolHolder context(tdbb, new_pool);

				CompilerScratch* csb = PAR_parse(tdbb, reinterpret_cast<const UCHAR*>(blr),
					blr_length, false);

				request = JrdStatement::makeRequest(tdbb, csb, false);
				request->getStatement()->verifyAccess(tdbb);

				for (size_t i = 0; i < csb->csb_rpt.getCount(); i++)
				{

					const MessageNode* node = csb->csb_rpt[i].csb_message;
					if (node)
					{
						if (node->messageNumber == 0)
							inMessage = node;
						else if (node->messageNumber == 1)
							outMessage = node;
					}
				}
			}
			catch (const Exception&)
			{
				if (request)
					CMP_release(tdbb, request);
				else
					att->deletePool(new_pool);

				throw;
			}

			request->req_attachment = tdbb->getAttachment();

			if (in_msg_length)
			{
				const ULONG len = inMessage ? inMessage->format->fmt_length : 0;

				if (in_msg_length != len)
				{
					ERR_post(Arg::Gds(isc_port_len) << Arg::Num(in_msg_length) <<
													   Arg::Num(len));
				}

				memcpy(request->getImpure<UCHAR>(inMessage->impureOffset), in_msg, in_msg_length);
			}

			EXE_start(tdbb, request, transaction);

			const ULONG len = outMessage ? outMessage->format->fmt_length : 0;

			if (out_msg_length != len)
			{
				ERR_post(Arg::Gds(isc_port_len) << Arg::Num(out_msg_length) <<
												   Arg::Num(len));
			}

			if (out_msg_length)
			{
				memcpy(out_msg, request->getImpure<UCHAR>(outMessage->impureOffset),
					out_msg_length);
			}

			check_autocommit(request, tdbb);

			CMP_release(tdbb, request);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JTransaction::getInfo(IStatus* user_status,
	unsigned int itemsLength, const unsigned char* items,
	unsigned int bufferLength, unsigned char* buffer)
{
/**************************************
 *
 *	g d s _ $ t r a n s a c t i o n _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on blob object.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			INF_transaction_info(getHandle(), itemsLength, items, bufferLength, buffer);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JRequest::unwind(IStatus* user_status, int level)
{
/**************************************
 *
 *	g d s _ $ u n w i n d
 *
 **************************************
 *
 * Functional description
 *	Unwind a running request.  This is potentially nasty since it can
 *	be called asynchronously.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		jrd_req* request = verify_request_synchronization(getHandle(), level);

		try
		{
			JRD_unwind_request(tdbb, request);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


JStatement* JAttachment::allocateStatement(IStatus* user_status)
{
	dsql_req* stmt = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			stmt = DSQL_allocate_statement(tdbb, getHandle());
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JStatement* js = new JStatement(stmt, this);
	stmt->req_interface = js;
	js->addRef();
	return js;
}


void SysAttachment::initDone()
{
	Attachment* attachment = getHandle();
	Database* dbb = attachment->att_database;
	SyncLockGuard guard(&dbb->dbb_sys_attach, SYNC_EXCLUSIVE, "SysAttachment::initDone");

	attachment->att_next = dbb->dbb_sys_attachments;
	dbb->dbb_sys_attachments = attachment;
}


void SysAttachment::destroy(Attachment* attachment)
{
	{
		Database* dbb = attachment->att_database;
		SyncLockGuard guard(&dbb->dbb_sys_attach, SYNC_EXCLUSIVE, "SysAttachment::destroy");

		for (Jrd::Attachment** ptr = &dbb->dbb_sys_attachments; *ptr; ptr = &(*ptr)->att_next)
		{
			if (*ptr == attachment)
			{
				*ptr = attachment->att_next;
				break;
			}
		}
	}

	Jrd::Attachment::destroy(attachment);
}


JTransaction* JStatement::execute(IStatus* user_status, Firebird::ITransaction* apiTra,
	unsigned int in_msg_type, const FbMessage* inMsgBuffer, const FbMessage* outMsgBuffer)
{
	JTransaction* jt = apiTra ? getAttachment()->getTransactionInterface(user_status, apiTra) : NULL;
	jrd_tra* tra = jt ? jt->getHandle() : NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);

		if (tra)
			validateHandle(tdbb, tra);

		check_database(tdbb);

		try
		{
			unsigned in_blr_length = inMsgBuffer ? inMsgBuffer->blrLength : 0;
			const unsigned char* in_blr = inMsgBuffer ? inMsgBuffer->blr : NULL;
			unsigned in_msg_length = inMsgBuffer ? inMsgBuffer->bufferLength : 0;
			unsigned char* in_msg = inMsgBuffer ? inMsgBuffer->buffer : NULL;

			unsigned out_blr_length = outMsgBuffer ? outMsgBuffer->blrLength : 0;
			const unsigned char* out_blr = outMsgBuffer ? outMsgBuffer->blr : NULL;
			unsigned out_msg_length = outMsgBuffer ? outMsgBuffer->bufferLength : 0;
			unsigned char* out_msg = outMsgBuffer ? outMsgBuffer->buffer : NULL;

			DSQL_execute(tdbb, &tra, getHandle(), in_blr_length, in_blr, in_msg_type, in_msg_length, in_msg,
						 out_blr_length, out_blr, out_msg_length, out_msg);

			if (jt && !tra)
			{
				jt->setHandle(NULL);
				jt->release();
				jt = NULL;
			}
			else if (tra && !jt)
			{
				jt = new JTransaction(tra, getAttachment());
				tra->setInterface(jt);
				jt->addRef();
			}
			else if (tra && jt)
			{
				jt->setHandle(tra);
				tra->setInterface(jt);
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	return jt;
}


JTransaction* JAttachment::execute(IStatus* user_status, Firebird::ITransaction* apiTra,
	unsigned int length, const char* string, unsigned int dialect,
	unsigned int /*in_msg_type*/, const FbMessage* inMsgBuffer,
	const FbMessage* outMsgBuffer)
{
	JTransaction* jt = apiTra ? getTransactionInterface(user_status, apiTra) : NULL;
	jrd_tra* tra = jt ? jt->getHandle() : NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this);

		if (tra)
			validateHandle(tdbb, tra);

		check_database(tdbb);

		try
		{
			unsigned in_blr_length = inMsgBuffer ? inMsgBuffer->blrLength : 0;
			const unsigned char* in_blr = inMsgBuffer ? inMsgBuffer->blr : NULL;
			unsigned in_msg_length = inMsgBuffer ? inMsgBuffer->bufferLength : 0;
			unsigned char* in_msg = inMsgBuffer ? inMsgBuffer->buffer : NULL;

			unsigned out_blr_length = outMsgBuffer ? outMsgBuffer->blrLength : 0;
			const unsigned char* out_blr = outMsgBuffer ? outMsgBuffer->blr : NULL;
			unsigned out_msg_length = outMsgBuffer ? outMsgBuffer->bufferLength : 0;
			unsigned char* out_msg = outMsgBuffer ? outMsgBuffer->buffer : NULL;

			DSQL_execute_immediate(tdbb, getHandle(), &tra, length, string, dialect,
				in_blr_length, in_blr, in_msg_length, in_msg,
				out_blr_length, out_blr, out_msg_length, out_msg, false);

			if (jt && !tra)
			{
				jt->setHandle(NULL);
				jt->release();
				jt = NULL;
			}
			else if (tra && !jt)
			{
				jt = new JTransaction(tra, this);
				jt->addRef();
				tra->setInterface(jt);
			}
			else if (tra && jt)
			{
				jt->setHandle(tra);
				tra->setInterface(jt);
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return NULL;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	return jt;
}


int JStatement::fetch(IStatus* user_status, const FbMessage* msgBuffer)
{
	int return_code = 0;

	try
	{
		EngineContextHolder tdbb(user_status, this);
		validateHandle(tdbb, getHandle()->req_transaction);
		check_database(tdbb);

		try
		{
			unsigned blr_length = msgBuffer ? msgBuffer->blrLength : 0;
			const unsigned char* blr = msgBuffer ? msgBuffer->blr : NULL;
			unsigned msg_length = msgBuffer ? msgBuffer->bufferLength : 0;
			unsigned char* msg = msgBuffer ? msgBuffer->buffer : NULL;

			return_code = getHandle()->fetch(tdbb, blr_length, blr, msg_length, msg);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return 0;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return 0;
	}

	successful_completion(user_status, return_code);

	return return_code;
}


void JStatement::freeEngineData(IStatus* user_status, unsigned int option)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			DSQL_free_statement(tdbb, getHandle(), option);
			if (option == DSQL_drop)
			{
				statement = NULL;
			}
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JStatement::free(IStatus* user_status, unsigned int option)
{
	freeEngineData(user_status, option);
	if (user_status->isSuccess() && option == DSQL_drop)
	{
		release();
	}
}


void JStatement::prepare(IStatus* user_status, Firebird::ITransaction* apiTra,
						 unsigned int stmtLength, const char* sqlStmt,
						 unsigned int dialect, unsigned int flags)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);

		jrd_tra* tra = apiTra ? getAttachment()->getEngineTransaction(user_status, apiTra) : NULL;

		if (tra)
			validateHandle(tdbb, tra);

		check_database(tdbb);

		try
		{
			Array<UCHAR> items, buffer;
			buffer.resize(StatementMetadata::buildInfoItems(items, flags));

			DSQL_prepare(tdbb, tra, &statement, stmtLength, sqlStmt, dialect,
				items.getCount(), items.begin(), buffer.getCount(), buffer.begin(), false);

			metadata.clear();
			metadata.parse(buffer.getCount(), buffer.begin());
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


unsigned JStatement::getType(IStatus* userStatus)
{
	unsigned ret = 0;

	try
	{
		EngineContextHolder tdbb(userStatus, this);
		check_database(tdbb);

		try
		{
			ret = metadata.getType();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, userStatus);
			return ret;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(userStatus);
		return ret;
	}

	successful_completion(userStatus);

	return ret;
}


const char* JStatement::getPlan(IStatus* userStatus, bool detailed)
{
	const char* ret = NULL;

	try
	{
		EngineContextHolder tdbb(userStatus, this);
		check_database(tdbb);

		try
		{
			ret = metadata.getPlan(detailed);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, userStatus);
			return ret;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(userStatus);
		return ret;
	}

	successful_completion(userStatus);

	return ret;
}

const IParametersMetadata* JStatement::getInputParameters(IStatus* userStatus)
{
	const IParametersMetadata* ret = NULL;

	try
	{
		EngineContextHolder tdbb(userStatus, this);
		check_database(tdbb);

		try
		{
			ret = metadata.getInputParameters();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, userStatus);
			return ret;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(userStatus);
		return ret;
	}

	successful_completion(userStatus);

	return ret;
}


const IParametersMetadata* JStatement::getOutputParameters(IStatus* userStatus)
{
	const IParametersMetadata* ret = NULL;

	try
	{
		EngineContextHolder tdbb(userStatus, this);
		check_database(tdbb);

		try
		{
			ret = metadata.getOutputParameters();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, userStatus);
			return ret;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(userStatus);
		return ret;
	}

	successful_completion(userStatus);

	return ret;
}


ISC_UINT64 JStatement::getAffectedRecords(IStatus* userStatus)
{
	ISC_UINT64 ret = 0;

	try
	{
		EngineContextHolder tdbb(userStatus, this);
		check_database(tdbb);

		try
		{
			ret = metadata.getAffectedRecords();
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, userStatus);
			return ret;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(userStatus);
		return ret;
	}

	successful_completion(userStatus);
	return ret;
}


void JStatement::setCursorName(IStatus* user_status, const char* cursor)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			getHandle()->setCursor(tdbb, cursor);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


void JStatement::getInfo(IStatus* user_status,
	unsigned int item_length, const unsigned char* items,
	unsigned int buffer_length, unsigned char* buffer)
{
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			DSQL_sql_info(tdbb, getHandle(), item_length, items, buffer_length, buffer);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}

void JAttachment::ping(IStatus* user_status)
{
/**************************************
 *
 *	G D S _ P I N G
 *
 **************************************
 *
 * Functional description
 *	Check the attachment handle for persistent errors.
 *
 **************************************/

	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}

} // namespace Jrd

#ifdef DEBUG_PROCS
void JRD_print_procedure_info(thread_db* tdbb, const char* mesg)
{
/*****************************************************
 *
 *	J R D _ p r i n t _ p r o c e d u r e _ i n f o
 *
 *****************************************************
 *
 * Functional description
 *	print name , use_count of all procedures in
 *      cache
 *
 ******************************************************/
	TEXT fname[MAXPATHLEN];

	Firebird::string fname = fb_utils::getPrefix(fb_utils::FB_DIR_LOG, "proc_info.log");
	FILE* fptr = fopen(fname.c_str(), "a+");
	if (!fptr)
	{
		gds__log("Failed to open %s\n", fname.c_str());
		return;
	}

	if (mesg)
		fputs(mesg, fptr);
	fprintf(fptr, "Prc Name      , prc id , flags  ,  Use Count , Alter Count\n");

	vec<jrd_prc*>* procedures = tdbb->getDatabase()->dbb_procedures;
	if (procedures)
	{
		vec<jrd_prc*>::iterator ptr, end;
		for (ptr = procedures->begin(), end = procedures->end(); ptr < end; ++ptr)
		{
			const jrd_prc* procedure = *ptr;
			if (procedure)
			{
				fprintf(fptr, "%s  ,  %d,  %X,  %d, %d\n",
							procedure->prc_name->hasData() ? procedure->prc_name->c_str() : "NULL",
							procedure->prc_id, procedure->prc_flags, procedure->prc_use_count,
							0); // procedure->prc_alter_count
			}
		}
	}
	else
		fprintf(fptr, "No Cached Procedures\n");

	fclose(fptr);

}
#endif // DEBUG_PROCS


bool JRD_reschedule(thread_db* tdbb, SLONG quantum, bool punt)
{
/**************************************
 *
 *	J R D _ r e s c h e d u l e
 *
 **************************************
 *
 * Functional description
 *	Somebody has kindly offered to relinquish
 *	control so that somebody else may run.
 *
 **************************************/
	Database* const dbb = tdbb->getDatabase();
	Jrd::Attachment* const att = tdbb->getAttachment();

	///if (dbb->dbb_sync->hasContention())
	{
		Jrd::Attachment::Checkout cout(att);
		THREAD_YIELD();
	}

	try
	{
		tdbb->checkCancelState(punt);
	}
	catch (const status_exception& ex)
	{
		tdbb->tdbb_flags |= TDBB_sys_error;

		const Arg::StatusVector status(ex.value());

		if (punt)
		{
			CCH_unwind(tdbb, false);
			ERR_post(status);
		}
		else
		{
			ERR_build_status(tdbb->tdbb_status_vector, status);
			return true;
		}
	}

	// Enable signal handler for the monitoring stuff
	if (dbb->dbb_ast_flags & DBB_monitor_off)
	{
		SyncLockGuard monGuard(&dbb->dbb_mon_sync, SYNC_EXCLUSIVE, "JRD_reschedule");
		if (dbb->dbb_ast_flags & DBB_monitor_off)
		{
			dbb->dbb_ast_flags &= ~DBB_monitor_off;
			LCK_lock(tdbb, dbb->dbb_monitor_lock, LCK_SR, LCK_WAIT);

			// While waiting for return from LCK_lock call above, the blocking AST (see
			// DatabaseSnapshot::blockingAst) was called and set DBB_monitor_off flag
			// again. But it do not released lock as lck_id was unknown at that moment.
			// Do it now to not block another process waiting for a monitoring lock.

			if (dbb->dbb_ast_flags & DBB_monitor_off)
				LCK_release(tdbb, dbb->dbb_monitor_lock);
		}
	}

	tdbb->tdbb_quantum = (tdbb->tdbb_quantum <= 0) ?
		(quantum ? quantum : QUANTUM) : tdbb->tdbb_quantum;

	return false;
}


void jrd_vtof(const char* string, char* field, SSHORT length)
{
/**************************************
 *
 *	j r d _ v t o f
 *
 **************************************
 *
 * Functional description
 *	Move a null terminated string to a fixed length
 *	field.
 *	If the length of the string pointed to by 'field'
 *	is less than 'length', this function pads the
 *	destination string with space upto 'length' bytes.
 *
 *	The call is primarily generated  by the preprocessor.
 *
 *	This is the same code as gds__vtof but is used internally.
 *
 **************************************/

	while (*string)
	{
		*field++ = *string++;
		if (--length <= 0) {
			return;
		}
	}

	if (length) {
		memset(field, ' ', length);
	}
}


static void check_database(thread_db* tdbb)
{
/**************************************
 *
 *	c h e c k _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Check an attachment for validity.
 *
 **************************************/
	SET_TDBB(tdbb);

	Database* dbb = tdbb->getDatabase();
	Jrd::Attachment* attachment = tdbb->getAttachment();

	// hvlad: i think the check below is unnecessary as attachment pointer is
	// already validated at AttachmentHolder. If I'm wrong and check is must be
	// then it should be moved into AttachmentHolder or even into
	// DatabaseContexHolder to not lock dbb_sync with attachment mutex locked.
	//
	//{
	//	SyncLockGuard dbbGuard(&dbb->dbb_sync, SYNC_SHARED, "check_database");
	//
	//	const Jrd::Attachment* attach = dbb->dbb_attachments;
	//	while (attach && attach != attachment)
	//		attach = attach->att_next;
	//
	//	if (!attach)
	//		status_exception::raise(Arg::Gds(isc_bad_db_handle));
	//}

	if (dbb->dbb_flags & DBB_bugcheck)
	{
		static const char string[] = "can't continue after bugcheck";
		status_exception::raise(Arg::Gds(isc_bug_check) << Arg::Str(string));
	}

	if ((attachment->att_flags & ATT_shutdown) ||
		((dbb->dbb_ast_flags & DBB_shutdown) &&
			((dbb->dbb_ast_flags & DBB_shutdown_full) || !attachment->locksmith())))
	{
		if (dbb->dbb_ast_flags & DBB_shutdown)
		{
			const PathName& filename = attachment->att_filename;
			status_exception::raise(Arg::Gds(isc_shutdown) << Arg::Str(filename));
		}
		else
		{
			status_exception::raise(Arg::Gds(isc_att_shutdown));
		}
	}

	if ((attachment->att_flags & ATT_cancel_raise) && !(attachment->att_flags & ATT_cancel_disable))
	{
		attachment->att_flags &= ~ATT_cancel_raise;
		status_exception::raise(Arg::Gds(isc_cancelled));
	}

	// Enable signal handler for the monitoring stuff.
	// See also comments in JRD_reshedule.

	if (dbb->dbb_ast_flags & DBB_monitor_off)
	{
		SyncLockGuard monGuard(&dbb->dbb_mon_sync, SYNC_EXCLUSIVE, "check_database");

		if (dbb->dbb_ast_flags & DBB_monitor_off)
		{
			dbb->dbb_ast_flags &= ~DBB_monitor_off;
			LCK_lock(tdbb, dbb->dbb_monitor_lock, LCK_SR, LCK_WAIT);

			if (dbb->dbb_ast_flags & DBB_monitor_off)
				LCK_release(tdbb, dbb->dbb_monitor_lock);
		}
	}
}


static void check_transaction(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	c h e c k _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Check transaction for not being interrupted
 *  in the meantime.
 *
 **************************************/
	SET_TDBB(tdbb);

	if (transaction && (transaction->tra_flags & TRA_cancel_request))
	{
		transaction->tra_flags &= ~TRA_cancel_request;
		status_exception::raise(Arg::Gds(isc_cancelled));
	}
}


static void commit(thread_db* tdbb, jrd_tra* transaction, const bool retaining_flag)
{
/**************************************
 *
 *	c o m m i t
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/

	if (transaction->tra_sibling && !(transaction->tra_flags & TRA_prepared))
		prepare_tra(tdbb, transaction, 0, NULL);
	else if (transaction->tra_in_use)
		status_exception::raise(Arg::Gds(isc_transaction_in_use));

	const Jrd::Attachment* const attachment = tdbb->getAttachment();

	if (!(attachment->att_flags & ATT_no_db_triggers) && !(transaction->tra_flags & TRA_prepared))
	{
		// run ON TRANSACTION COMMIT triggers
		run_commit_triggers(tdbb, transaction);
	}

	jrd_tra* next = transaction;

	while ( (transaction = next) )
	{
		next = transaction->tra_sibling;
		validateHandle(tdbb, transaction->tra_attachment);
		tdbb->setTransaction(transaction);
		check_database(tdbb);
		TRA_commit(tdbb, transaction, retaining_flag);
	}
}


static bool drop_files(const jrd_file* file)
{
/**************************************
 *
 *	d r o p _ f i l e s
 *
 **************************************
 *
 * Functional description
 *	drop a linked list of files
 *
 **************************************/
	ISC_STATUS_ARRAY status;

	status[1] = FB_SUCCESS;

	for (; file; file = file->fil_next)
	{
		if (unlink(file->fil_string))
		{
			ERR_build_status(status, Arg::Gds(isc_io_error) << Arg::Str("unlink") <<
							   								   Arg::Str(file->fil_string) <<
									 Arg::Gds(isc_io_delete_err) << SYS_ERR(errno));
			Database* dbb = GET_DBB();
			PageSpace* pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
			gds__log_status(pageSpace->file->fil_string, status);
		}
	}

	return status[1] ? true : false;
}


static jrd_tra* find_transaction(thread_db* tdbb, ISC_STATUS error_code)
{
/**************************************
 *
 *	f i n d _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Find the element of a possible multiple database transaction
 *	that corresponds to the current database.
 *
 **************************************/
	SET_TDBB(tdbb);

	const Jrd::Attachment* const attachment = tdbb->getAttachment();

	for (jrd_tra* transaction = tdbb->getTransaction(); transaction;
		transaction = transaction->tra_sibling)
	{
		if (transaction->tra_attachment == attachment)
		{
			return transaction;
		}
	}

	status_exception::raise(Arg::Gds(error_code));
	return NULL;	// Added to remove compiler warnings
}


static void find_intl_charset(thread_db* tdbb, Jrd::Attachment* attachment, const DatabaseOptions* options)
{
/**************************************
 *
 *	f i n d _ i n t l _ c h a r s e t
 *
 **************************************
 *
 * Functional description
 *	Attachment has declared it's prefered character set
 *	as part of LC_CTYPE, passed over with the attachment
 *	block.  Now let's resolve that to an internal subtype id.
 *
 **************************************/
	SET_TDBB(tdbb);

	if (options->dpb_lc_ctype.isEmpty())
	{
		// No declaration of character set, act like 3.x Interbase
		attachment->att_client_charset = attachment->att_charset = DEFAULT_ATTACHMENT_CHARSET;
		return;
	}

	USHORT id;

	const UCHAR* lc_ctype = reinterpret_cast<const UCHAR*>(options->dpb_lc_ctype.c_str());

	if (MET_get_char_coll_subtype(tdbb, &id, lc_ctype, options->dpb_lc_ctype.length()) &&
		INTL_defined_type(tdbb, id & 0xFF) && ((id & 0xFF) != CS_BINARY))
	{
		attachment->att_client_charset = attachment->att_charset = id & 0xFF;
	}
	else
	{
		// Report an error - we can't do what user has requested
		ERR_post(Arg::Gds(isc_bad_dpb_content) <<
				 Arg::Gds(isc_charset_not_found) << Arg::Str(options->dpb_lc_ctype));
	}
}

namespace
{
	void dpbErrorRaise()
	{
		ERR_post(Arg::Gds(isc_bad_dpb_form) <<
				 Arg::Gds(isc_wrodpbver));
	}
} // anonymous

void DatabaseOptions::get(const UCHAR* dpb, USHORT dpb_length, bool& invalid_client_SQL_dialect)
{
/**************************************
 *
 *	D a t a b a s e O p t i o n s : : g e t
 *
 **************************************
 *
 * Functional description
 *	Parse database parameter block picking up options and things.
 *
 **************************************/
	SSHORT num_old_files = 0;

	dpb_buffers = 0;
	dpb_sweep_interval = -1;
	dpb_overwrite = false;
	dpb_sql_dialect = 99;
	invalid_client_SQL_dialect = false;

	if (dpb_length == 0)
	{
		return;
	}
	if (dpb == NULL)
	{
		ERR_post(Arg::Gds(isc_bad_dpb_form));
	}

	ClumpletReader rdr(ClumpletReader::dpbList, dpb, dpb_length, dpbErrorRaise);

	dpb_utf8_filename = rdr.find(isc_dpb_utf8_filename);

	for (rdr.rewind(); !rdr.isEof(); rdr.moveNext())
	{
		switch (rdr.getClumpTag())
		{
		case isc_dpb_working_directory:
			getPath(rdr, dpb_working_directory);
			break;

		case isc_dpb_set_page_buffers:
			dpb_page_buffers = rdr.getInt();
			if (dpb_page_buffers &&
				(dpb_page_buffers < MIN_PAGE_BUFFERS || dpb_page_buffers > MAX_PAGE_BUFFERS))
			{
				ERR_post(Arg::Gds(isc_bad_dpb_content));
			}
			dpb_set_page_buffers = true;
			break;

		case isc_dpb_num_buffers:
			if (!Config::getSharedCache())
			{
				dpb_buffers = rdr.getInt();
				if (dpb_buffers < 10)
				{
					ERR_post(Arg::Gds(isc_bad_dpb_content));
				}
			}
			else
				rdr.getInt();
			break;

		case isc_dpb_page_size:
			dpb_page_size = (USHORT) rdr.getInt();
			break;

		case isc_dpb_debug:
			rdr.getInt();
			break;

		case isc_dpb_sweep:
			dpb_sweep = (USHORT) rdr.getInt();
			break;

		case isc_dpb_sweep_interval:
			dpb_sweep_interval = rdr.getInt();
			break;

		case isc_dpb_verify:
			dpb_verify = (USHORT) rdr.getInt();
			if (dpb_verify & isc_dpb_ignore)
				dpb_flags |= DBB_damaged;
			break;

		case isc_dpb_trace:
			rdr.getInt();
			break;

		case isc_dpb_damaged:
			if (rdr.getInt() & 1)
				dpb_flags |= DBB_damaged;
			break;

		case isc_dpb_enable_journal:
			rdr.getString(dpb_journal);
			break;

		case isc_dpb_wal_backup_dir:
			// ignore, skip
			break;

		case isc_dpb_drop_walfile:
			dpb_wal_action = (USHORT) rdr.getInt();
			break;

		case isc_dpb_old_dump_id:
		case isc_dpb_online_dump:
		case isc_dpb_old_file_size:
		case isc_dpb_old_num_files:
		case isc_dpb_old_start_page:
		case isc_dpb_old_start_seqno:
		case isc_dpb_old_start_file:
			// ignore, skip
			break;

		case isc_dpb_old_file:
			//if (num_old_files >= MAX_OLD_FILES) complain here, for now.
				ERR_post(Arg::Gds(isc_num_old_files));
			// following code is never executed now !
			num_old_files++;
			break;

		case isc_dpb_wal_chkptlen:
		case isc_dpb_wal_numbufs:
		case isc_dpb_wal_bufsize:
		case isc_dpb_wal_grp_cmt_wait:
			// ignore, skip
			break;

		case isc_dpb_dbkey_scope:
			dpb_dbkey_scope = (USHORT) rdr.getInt();
			break;

		case isc_dpb_sql_role_name:
			getString(rdr, dpb_role_name);
			break;

		case isc_dpb_auth_block:
			dpb_auth_block.clear();
			dpb_auth_block.add(rdr.getBytes(), rdr.getClumpLength());
			break;

		case isc_dpb_user_name:
			getString(rdr, dpb_user_name);
			break;

		case isc_dpb_trusted_auth:
			getString(rdr, dpb_trusted_login);
			break;

		case isc_dpb_encrypt_key:
#ifdef ISC_DATABASE_ENCRYPTION
			rdr.getString(dpb_key);
#else
			// Just in case there WAS a customer using this unsupported
			// feature - post an error when they try to access it in 4.0
			ERR_post(Arg::Gds(isc_uns_ext) <<
					 Arg::Gds(isc_random) << Arg::Str("Encryption not supported"));
#endif
			break;

		case isc_dpb_no_garbage_collect:
			dpb_no_garbage = true;
			break;

		case isc_dpb_activate_shadow:
			dpb_activate_shadow = true;
			break;

		case isc_dpb_delete_shadow:
			dpb_delete_shadow = true;
			break;

		case isc_dpb_force_write:
			dpb_set_force_write = true;
			dpb_force_write = rdr.getInt() != 0;
			break;

		case isc_dpb_begin_log:
			break;

		case isc_dpb_quit_log:
			break;

		case isc_dpb_no_reserve:
			dpb_set_no_reserve = true;
			dpb_no_reserve = rdr.getInt() != 0;
			break;

		case isc_dpb_interp:
			dpb_interp = (SSHORT) rdr.getInt();
			break;

		case isc_dpb_lc_ctype:
			rdr.getString(dpb_lc_ctype);
			break;

		case isc_dpb_shutdown:
			dpb_shutdown = (USHORT) rdr.getInt();
			// Enforce default
			if ((dpb_shutdown & isc_dpb_shut_mode_mask) == isc_dpb_shut_default)
				dpb_shutdown |= isc_dpb_shut_multi;
			break;

		case isc_dpb_shutdown_delay:
			dpb_shutdown_delay = (SSHORT) rdr.getInt();
			break;

		case isc_dpb_online:
			dpb_online = (USHORT) rdr.getInt();
			// Enforce default
			if ((dpb_online & isc_dpb_shut_mode_mask) == isc_dpb_shut_default)
			{
				dpb_online |= isc_dpb_shut_normal;
			}
			break;

		case isc_dpb_reserved:
			{
				string single;
				rdr.getString(single);
				if (single == "YES")
				{
					dpb_single_user = true;
				}
			}
			break;

		case isc_dpb_overwrite:
			dpb_overwrite = rdr.getInt() != 0;
			break;

		case isc_dpb_sec_attach:
			dpb_sec_attach = rdr.getInt() != 0;
			dpb_buffers = 50;
			dpb_flags |= DBB_security_db;
			break;

		case isc_dpb_gbak_attach:
			{
				string gbakStr;
				rdr.getString(gbakStr);
				dpb_gbak_attach = gbakStr.hasData();
			}
			break;

		case isc_dpb_gstat_attach:
			dpb_gstat_attach = true;
			break;

		case isc_dpb_gfix_attach:
			dpb_gfix_attach = true;
			break;

		case isc_dpb_gsec_attach:
			dpb_gsec_attach = rdr.getBoolean();
			break;

		case isc_dpb_disable_wal:
			dpb_disable_wal = true;
			break;

		case isc_dpb_connect_timeout:
			dpb_connect_timeout = rdr.getInt();
			break;

		case isc_dpb_dummy_packet_interval:
			dpb_dummy_packet_interval = rdr.getInt();
			break;

		case isc_dpb_sql_dialect:
			dpb_sql_dialect = (USHORT) rdr.getInt();
			if (dpb_sql_dialect > SQL_DIALECT_V6)
				invalid_client_SQL_dialect = true;
			break;

		case isc_dpb_set_db_sql_dialect:
			dpb_set_db_sql_dialect = (USHORT) rdr.getInt();
			break;

		case isc_dpb_set_db_readonly:
			dpb_set_db_readonly = true;
			dpb_db_readonly = rdr.getInt() != 0;
			break;

		case isc_dpb_set_db_charset:
			getString(rdr, dpb_set_db_charset);
			break;

		case isc_dpb_address_path:
			{
				ClumpletReader address_stack(ClumpletReader::UnTagged,
											 rdr.getBytes(), rdr.getClumpLength());
				while (!address_stack.isEof())
				{
					if (address_stack.getClumpTag() != isc_dpb_address)
					{
						address_stack.moveNext();
						continue;
					}
					ClumpletReader address(ClumpletReader::UnTagged,
										   address_stack.getBytes(), address_stack.getClumpLength());
					while (!address.isEof())
					{
						switch (address.getClumpTag())
						{
							case isc_dpb_addr_protocol:
								address.getString(dpb_network_protocol);
								break;
							case isc_dpb_addr_endpoint:
								address.getString(dpb_remote_address);
								break;
							default:
								break;
						}
						address.moveNext();
					}
					break;
				}
			}
			break;

		case isc_dpb_process_id:
			dpb_remote_pid = rdr.getInt();
			break;

		case isc_dpb_process_name:
			getPath(rdr, dpb_remote_process);
			break;

		case isc_dpb_no_db_triggers:
			dpb_no_db_triggers = rdr.getInt() != 0;
			break;

		case isc_dpb_org_filename:
			getPath(rdr, dpb_org_filename);
			break;

		case isc_dpb_ext_call_depth:
			dpb_ext_call_depth = (ULONG) rdr.getInt();
			if (dpb_ext_call_depth >= MAX_CALLBACKS)
				ERR_post(Arg::Gds(isc_exec_sql_max_call_exceeded));
			break;

		default:
			break;
		}
	}

	if (! rdr.isEof())
		ERR_post(Arg::Gds(isc_bad_dpb_form));
}


static void handle_error(Firebird::IStatus* user_status, ISC_STATUS code)
{
/**************************************
 *
 *	h a n d l e _ e r r o r
 *
 **************************************
 *
 * Functional description
 *	An invalid handle has been passed in.  If there is a user status
 *	vector, make it reflect the error.  If not, emulate the routine
 *	"error" and abort.
 *
 **************************************/
 	if (user_status)
	{
		user_status->set(Arg::Gds(code).value());
	}
}


static Database* init(thread_db* tdbb,
					  const PathName& expanded_filename, // only for SS
					  RefPtr<Config> config,
					  bool attach_flag) // only for SS
{
/**************************************
 *
 *	i n i t
 *
 **************************************
 *
 * Functional description
 *	Initialize for database access.  First call from both CREATE and
 *	OPEN.
 *	Upon entry mutex databases_mutex must be locked.
 *
 **************************************/
	SET_TDBB(tdbb);

	// Initialize standard random generator.
	// MSVC (at least since version 7) have per-thread random seed.
	// As we don't know who uses per-thread seed, this should work for both cases.
	static bool first_rand = true;
	static int first_rand_value = rand();

	if (first_rand || (rand() == first_rand_value))
		srand(time(NULL));

	first_rand = false;

	engineStartup.init();

	Database* dbb = NULL;

	// Check to see if the database is already actively attached

	if (config->getSharedCache())
	{
		for (dbb = databases; dbb; dbb = dbb->dbb_next)
		{
			if (!(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use)) &&
				(dbb->dbb_filename == expanded_filename))
			{
				if (attach_flag)
					return dbb;

				ERR_post(Arg::Gds(isc_no_meta_update) <<
						 Arg::Gds(isc_obj_in_use) << Arg::Str("DATABASE"));
			}
		}
	}

	dbb = Database::create();
	dbb->dbb_config = config;
	tdbb->setDatabase(dbb);

	// provide context pool for the rest stuff
	Jrd::ContextPoolHolder context(tdbb, dbb->dbb_permanent);

	dbb->dbb_next = databases;
	databases = dbb;

	dbb->dbb_flags |= DBB_exclusive;
	dbb->dbb_sweep_interval = SWEEP_INTERVAL;

	dbb->dbb_monitoring_id = fb_utils::genUniqueId();

	// set a garbage collection policy

	if ((dbb->dbb_flags & (DBB_gc_cooperative | DBB_gc_background)) == 0)
	{
		if (!dbb->dbb_config->getSharedCache()) {
			dbb->dbb_flags |= DBB_gc_cooperative;
		}
		else
		{
			string gc_policy = dbb->dbb_config->getGCPolicy();
			gc_policy.lower();
			if (gc_policy == GCPolicyCooperative) {
				dbb->dbb_flags |= DBB_gc_cooperative;
			}
			else if (gc_policy == GCPolicyBackground) {
				dbb->dbb_flags |= DBB_gc_background;
			}
			else if (gc_policy == GCPolicyCombined) {
				dbb->dbb_flags |= DBB_gc_cooperative | DBB_gc_background;
			}
			else // config value is invalid
			{
				// this should not happen - means bug in config
				fb_assert(false);
			}
		}
	}

	// Initialize a number of subsystems

#ifdef ISC_DATABASE_ENCRYPTION
	// Lookup some external "hooks"

	/*** ASF: old PluginManager
	PluginManager::Plugin crypt_lib = PluginManager::enginePluginManager().findPlugin(CRYPT_IMAGE);
	if (crypt_lib)
	{
		string encrypt_entrypoint(ENCRYPT);
		string decrypt_entrypoint(DECRYPT);
		dbb->dbb_encrypt = (Database::crypt_routine) crypt_lib.lookupSymbol(encrypt_entrypoint);
		dbb->dbb_decrypt = (Database::crypt_routine) crypt_lib.lookupSymbol(decrypt_entrypoint);
	}
	***/
#endif

	return dbb;
}


static void init_database_locks(thread_db* tdbb)
{
/**************************************
 *
 *	i n i t _ d a t a b a s e _ l o c k s
 *
 **************************************
 *
 * Functional description
 *	Initialize database locks.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* const dbb = tdbb->getDatabase();

	// Main database lock

	PageSpace* const pageSpace = dbb->dbb_page_manager.findPageSpace(DB_PAGE_SPACE);
	fb_assert(pageSpace && pageSpace->file);

	UCharBuffer file_id;
	PIO_get_unique_file_id(pageSpace->file, file_id);
	size_t key_length = file_id.getCount();

	Lock* lock = FB_NEW_RPT(*dbb->dbb_permanent, key_length) Lock;
	dbb->dbb_lock = lock;
	lock->lck_type = LCK_database;
	lock->lck_owner_handle = LCK_get_owner_handle(tdbb, lock->lck_type);
	lock->lck_object = dbb;
	lock->lck_length = key_length;
	lock->lck_dbb = dbb;
	lock->lck_ast = CCH_down_grade_dbb;
	memcpy(lock->lck_key.lck_string, file_id.begin(), key_length);

	// Try to get an exclusive lock on database.
	// If this fails, insist on at least a shared lock.

	dbb->dbb_flags |= DBB_exclusive;
	if (!LCK_lock(tdbb, lock, LCK_EX, LCK_NO_WAIT))
	{
		// Clean status vector from lock manager error code
		fb_utils::init_status(tdbb->tdbb_status_vector);

		dbb->dbb_flags &= ~DBB_exclusive;

		while (!LCK_lock(tdbb, lock, LCK_SW, -1))
		{
			fb_utils::init_status(tdbb->tdbb_status_vector);

			// If we are in a single-threaded maintenance mode then clean up and stop waiting
			SCHAR spare_memory[MIN_PAGE_SIZE * 2];
			SCHAR* header_page_buffer = (SCHAR*) FB_ALIGN((IPTR) spare_memory, MIN_PAGE_SIZE);
			Ods::header_page* const header_page = reinterpret_cast<Ods::header_page*>(header_page_buffer);

			PIO_header(dbb, header_page_buffer, MIN_PAGE_SIZE);

			if ((header_page->hdr_flags & Ods::hdr_shutdown_mask) == Ods::hdr_shutdown_single)
			{
				ERR_post(Arg::Gds(isc_shutdown) << Arg::Str(pageSpace->file->fil_string));
			}
		}
	}

	// Lock shared by all dbb owners, used to signal other processes
	// to dump their monitoring data and synchronize operations

	lock = FB_NEW_RPT(*dbb->dbb_permanent, sizeof(SLONG)) Lock();
	dbb->dbb_monitor_lock = lock;
	lock->lck_type = LCK_monitor;
	lock->lck_owner_handle = LCK_get_owner_handle(tdbb, lock->lck_type);
	lock->lck_parent = dbb->dbb_lock;
	lock->lck_length = sizeof(SLONG);
	lock->lck_dbb = dbb;
	lock->lck_object = dbb;
	lock->lck_ast = DatabaseSnapshot::blockingAst;
	LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT);
}


static void prepare_tra(thread_db* tdbb, jrd_tra* transaction, USHORT length, const UCHAR* msg)
{
/**************************************
 *
 *	p r e p a r e
 *
 **************************************
 *
 * Functional description
 *	Attempt to prepare a transaction.
 *
 **************************************/
	SET_TDBB(tdbb);

	if (transaction->tra_in_use)
		status_exception::raise(Arg::Gds(isc_transaction_in_use));

	if (!(transaction->tra_flags & TRA_prepared))
	{
		// run ON TRANSACTION COMMIT triggers
		run_commit_triggers(tdbb, transaction);
	}

	for (; transaction; transaction = transaction->tra_sibling)
	{
		validateHandle(tdbb, transaction->tra_attachment);
		tdbb->setTransaction(transaction);
		check_database(tdbb);
		TRA_prepare(tdbb, transaction, length, msg);
	}
}


static void release_attachment(thread_db* tdbb, Jrd::Attachment* attachment)
{
/**************************************
 *
 *	r e l e a s e _ a t t a c h m e n t
 *
 **************************************
 *
 * Functional description
 *	Disconnect attachment block from database block.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* dbb = tdbb->getDatabase();
	CHECK_DBB(dbb);

	if (!attachment)
		return;

	dbb->dbb_extManager.closeAttachment(tdbb, attachment);

	if (!dbb->dbb_config->getSharedDatabase() && attachment->att_relations)
	{
		vec<jrd_rel*>& rels = *attachment->att_relations;
		for (size_t i = 1; i < rels.count(); i++)
		{
			jrd_rel* relation = rels[i];
			if (relation && (relation->rel_flags & REL_temp_conn) &&
				!(relation->rel_flags & (REL_deleted | REL_deleting)) )
			{
				relation->delPages(tdbb);
			}
		}
	}

	if (dbb->dbb_event_mgr && attachment->att_event_session)
	{
		dbb->dbb_event_mgr->deleteSession(attachment->att_event_session);
	}

    // CMP_release() changes att_requests.
	while (!attachment->att_requests.isEmpty())
		CMP_release(tdbb, attachment->att_requests.back());

	MET_clear_cache(tdbb);

	attachment->releaseLocks(tdbb);

	// Shut down any extern relations

	if (attachment->att_relations)
	{
		vec<jrd_rel*>* vector = attachment->att_relations;
		vec<jrd_rel*>::iterator ptr = vector->begin(), end = vector->end();

		while (ptr < end)
		{
			jrd_rel* relation = *ptr++;
			if (relation)
			{
				if (relation->rel_file)
				{
					EXT_fini(relation, false);
				}

				for (IndexBlock* index_block = relation->rel_index_blocks;
					 index_block;
					 index_block = index_block->idb_next)
				{
					if (index_block->idb_lock)
						LCK_release(tdbb, index_block->idb_lock);
				}

				delete relation;
			}
		}
	}

	if (attachment->att_id_lock)
		LCK_release(tdbb, attachment->att_id_lock);

	if (attachment->att_temp_pg_lock)
		LCK_release(tdbb, attachment->att_temp_pg_lock);

	DSqlCache::Accessor accessor(&attachment->att_dsql_cache);
	for (bool getResult = accessor.getFirst(); getResult; getResult = accessor.getNext())
	{
		LCK_release(tdbb, accessor.current()->second.lock);
	}

	for (vcl** vector = attachment->att_counts; vector < attachment->att_counts + DBB_max_count;
		++vector)
	{
		delete *vector;
		*vector = NULL;
	}

	// Release any validation error vector allocated

	delete attachment->att_val_errors;
	attachment->att_val_errors = NULL;

	attachment->destroyIntlObjects(tdbb);

	attachment->detachLocksFromAttachment();

	if (attachment->att_flags & ATT_lck_init_done)
	{
		LCK_fini(tdbb, LCK_OWNER_attachment);
		attachment->att_flags &= ~ATT_lck_init_done;
	}

	delete attachment->att_compatibility_table;

	if (attachment->att_dsql_instance)
	{
		MemoryPool* const pool = &attachment->att_dsql_instance->dbb_pool;
		delete attachment->att_dsql_instance;
		attachment->deletePool(pool);
	}

	// remove the attachment block from the dbb linked list

	for (Jrd::Attachment** ptr = &dbb->dbb_attachments; *ptr; ptr = &(*ptr)->att_next)
	{
		if (*ptr == attachment)
		{
			*ptr = attachment->att_next;
			break;
		}
	}

	SCL_release_all(attachment->att_security_classes);

	delete attachment->att_user;

	tdbb->setAttachment(NULL);
	Jrd::Attachment::destroy(attachment);	// string were re-saved in the beginning of this function,
											// keep that in sync please
}


static void rollback(thread_db* tdbb, jrd_tra* transaction, const bool retaining_flag)
{
/**************************************
 *
 *	r o l l b a c k
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction.
 *
 **************************************/
	if (transaction->tra_in_use)
		status_exception::raise(Arg::Gds(isc_transaction_in_use));

	ISC_STATUS_ARRAY user_status = {0};
	ISC_STATUS_ARRAY local_status = {0};
	ISC_STATUS* const orig_status = tdbb->tdbb_status_vector;

	try
	{
		jrd_tra* next = transaction;

		while ( (transaction = next) )
		{
			next = transaction->tra_sibling;

			try
			{
				validateHandle(tdbb, transaction->tra_attachment);
				check_database(tdbb);

				const Database* const dbb = tdbb->getDatabase();
				const Jrd::Attachment* const attachment = tdbb->getAttachment();

				if (!(attachment->att_flags & ATT_no_db_triggers))
				{
					try
					{
						ISC_STATUS_ARRAY temp_status = {0};
						tdbb->tdbb_status_vector = temp_status;

						// run ON TRANSACTION ROLLBACK triggers
						EXE_execute_db_triggers(tdbb, transaction, jrd_req::req_trigger_trans_rollback);
					}
					catch (const Exception&)
					{
						if (dbb->dbb_flags & DBB_bugcheck)
							throw;
					}
				}

				tdbb->tdbb_status_vector = user_status;
				tdbb->setTransaction(transaction);
				TRA_rollback(tdbb, transaction, retaining_flag, false);
			}
			catch (const Exception& ex)
			{
				ex.stuff_exception(user_status);
				tdbb->tdbb_status_vector = local_status;
			}
		}
	}
	catch (const Exception& ex)
	{
		ex.stuff_exception(user_status);
	}

	tdbb->tdbb_status_vector = orig_status;

	if (user_status[1] != FB_SUCCESS)
		status_exception::raise(user_status);
}


static void shutdown_database(Database* dbb, const bool release_pools)
{
/**************************************
 *
 *	s h u t d o w n _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Shutdown physical database environment.
 *	NOTE:  This routine assumes that upon entry,
 *	mutex databases_mutex will be locked.
 *
 **************************************/
	thread_db* tdbb = JRD_get_thread_data();

	// Shutdown file and/or remote connection

#ifdef SUPERSERVER_V2
	TRA_header_write(tdbb, dbb, 0L);	// Update transaction info on header page.
#endif

	VIO_fini(tdbb);
	CCH_fini(tdbb);

	if (dbb->dbb_backup_manager)
		dbb->dbb_backup_manager->shutdown(tdbb);

	if (dbb->dbb_monitor_lock)
		LCK_release(tdbb, dbb->dbb_monitor_lock);

	if (dbb->dbb_shadow_lock)
		LCK_release(tdbb, dbb->dbb_shadow_lock);

	if (dbb->dbb_retaining_lock)
		LCK_release(tdbb, dbb->dbb_retaining_lock);

	dbb->dbb_shared_counter.shutdown(tdbb);

	if (dbb->dbb_lock)
		LCK_release(tdbb, dbb->dbb_lock);

	Database** d_ptr;	// Intentionally left outside loop (HP/UX compiler)
	for (d_ptr = &databases; *d_ptr; d_ptr = &(*d_ptr)->dbb_next)
	{
		if (*d_ptr == dbb)
		{
			*d_ptr = dbb->dbb_next;
			break;
		}
	}

	if (dbb->dbb_flags & DBB_lck_init_done)
	{
		dbb->dbb_page_manager.releaseLocks();

		LCK_fini(tdbb, LCK_OWNER_database);
		dbb->dbb_flags &= ~DBB_lck_init_done;
	}

	if (release_pools)
	{
		tdbb->setDatabase(NULL);
		Database::destroy(dbb);
	}
}


static void strip_quotes(string& out)
{
/**************************************
 *
 *	s t r i p _ q u o t e s
 *
 **************************************
 *
 * Functional description
 *	Get rid of quotes around strings
 *	Quotes in the middle will confuse this routine!
 *
 **************************************/
	if (out.isEmpty())
	{
		return;
	}

	if (out[0] == DBL_QUOTE || out[0] == SINGLE_QUOTE)
	{
		// Skip any initial quote
		const char quote = out[0];
		out.erase(0, 1);
		// Search for same quote
		size_t pos = out.find(quote);
		if (pos != string::npos)
		{
			out.erase(pos);
		}
	}
}


static bool shutdown_dbb(thread_db* tdbb, Database* dbb)
{
/**************************************
 *
 *	s h u t d o w n _ d b b
 *
 **************************************
 *
 * Functional description
 *	rollback every transaction,
 *	release every attachment,
 *	and shutdown database.
 *
 **************************************/
	tdbb->setDatabase(dbb);
	tdbb->tdbb_flags |= TDBB_shutdown_manager;
	DatabaseContextHolder dbbHolder(tdbb);

	if (!(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use | DBB_security_db)))
	{
		Jrd::Attachment* att_next;

		for (Jrd::Attachment* attach = dbb->dbb_attachments; attach; attach = att_next)
		{
			att_next = attach->att_next;
			tdbb->setAttachment(attach);

			// purge_attachment() below can do an ERR_post
#pragma FB_COMPILER_MESSAGE("Please review the usage of temp_status v/s purge_attachment")
			// CVC: I see a problem here because purge_attachment doesn't use the passed vector.
			ISC_STATUS_ARRAY temp_status;
			fb_utils::init_status(temp_status);
			tdbb->tdbb_status_vector = temp_status;

			try
			{
				// purge attachment, rollback any open transactions
				purge_attachment(tdbb, attach, true);
			}
			catch (const Exception& ex)
			{
				iscLogException("error while shutting down attachment", ex);
				return false;
			}
		}
	}

	return true;
}


void JRD_enum_attachments(PathNameList* dbList, ULONG& atts, ULONG& dbs, ULONG& svcs)
{
/**************************************
 *
 *	J R D _ e n u m _ a t t a c h m e n t s
 *
 **************************************
 *
 * Functional description
 *	Count the number of active databases and
 *	attachments.
 *
 **************************************/
	atts = dbs = svcs = 0;

	try
	{
		PathNameList dbFiles(*getDefaultMemoryPool());

		MutexLockGuard guard(databases_mutex);

		// Zip through the list of databases and count the number of local
		// connections.  If buf is not NULL then copy all the database names
		// that will fit into it.

		for (Database* dbb = databases; dbb; dbb = dbb->dbb_next)
		{
			SyncLockGuard guard(&dbb->dbb_sync, SYNC_SHARED, "JRD_enum_attachments");

			if (!(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use | DBB_security_db)))
			{
				if (!dbFiles.exist(dbb->dbb_filename))
					dbFiles.add(dbb->dbb_filename);

				for (const Jrd::Attachment* attach = dbb->dbb_attachments; attach;
					 attach = attach->att_next)
				{
					atts++;
				}
			}
		}

		dbs = (ULONG) dbFiles.getCount();
		svcs = Service::totalCount();

		if (dbList)
		{
			*dbList = dbFiles;
		}
	}
	catch (const Exception&)
	{
		// Here we ignore possible errors from databases_mutex.
		// They were always silently ignored, and for this function
		// we really have no way to notify world about mutex problem.
		//		AP. 2008.
	}
}


void JTransaction::freeEngineData(Firebird::IStatus* user_status)
{
/**************************************
 *
 *	f r e e E n g i n e D a t a
 *
 **************************************
 *
 * Functional description
 *	Release or rollback transaction depending upon prepared it or not.
 *
 **************************************/
	try
	{
		EngineContextHolder tdbb(user_status, this);
		check_database(tdbb);

		try
		{
			if (transaction->tra_flags & TRA_prepared ||
				tdbb->getDatabase()->dbb_ast_flags & DBB_shutdown ||
				tdbb->getAttachment()->att_flags & ATT_shutdown)
			{
				EDS::Transaction::jrdTransactionEnd(tdbb, transaction, false, false, false);
				TRA_release_transaction(tdbb, transaction);
			}
			else
				TRA_rollback(tdbb, transaction, false, false);

			transaction = NULL;
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status);
			return;
		}
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return;
	}

	successful_completion(user_status);
}


static unsigned int purge_transactions(thread_db*	tdbb,
									   Jrd::Attachment*	attachment,
									   const bool	force_flag,
									   const ULONG	att_flags)
{
/**************************************
 *
 *	p u r g e _ t r a n s a c t i o n s
 *
 **************************************
 *
 * Functional description
 *	commit or rollback all transactions
 *	from an attachment
 *
 **************************************/
	Database* dbb = attachment->att_database;
	jrd_tra* trans_dbk = attachment->att_dbkey_trans;

	unsigned int count = 0;
	jrd_tra* next;

	for (jrd_tra* transaction = attachment->att_transactions; transaction; transaction = next)
	{
		next = transaction->tra_next;
		if (transaction != trans_dbk)
		{
			if ((transaction->tra_flags & TRA_prepared) || (dbb->dbb_ast_flags & DBB_shutdown) ||
				(att_flags & ATT_shutdown))
			{
				EDS::Transaction::jrdTransactionEnd(tdbb, transaction, false, false, true);
				TRA_release_transaction(tdbb, transaction);
			}
			else if (force_flag)
				TRA_rollback(tdbb, transaction, false, true);
			else
				++count;
		}
	}

	if (count)
	{
		return count;
	}

	// If there's a side transaction for db-key scope, get rid of it
	if (trans_dbk)
	{
		attachment->att_dbkey_trans = NULL;
		if ((dbb->dbb_ast_flags & DBB_shutdown) || (att_flags & ATT_shutdown))
		{
			TRA_release_transaction(tdbb, trans_dbk);
		}
		else
		{
			TRA_commit(tdbb, trans_dbk, false);
		}
	}

	return 0;
}


static void purge_attachment(thread_db* tdbb, Jrd::Attachment* attachment, const bool force_flag)
{
/**************************************
 *
 *	p u r g e _ a t t a c h m e n t
 *
 **************************************
 *
 * Functional description
 *	Zap an attachment, shutting down the database
 *	if it is the last one.
 *	NOTE:  This routine assumes that upon entry,
 *	mutex databases_mutex will be locked.
 *
 **************************************/
	SET_TDBB(tdbb);
	Database* const dbb = attachment->att_database;

	tdbb->tdbb_flags |= TDBB_detaching;

	if (!(dbb->dbb_flags & DBB_bugcheck))
	{
		try
		{
			const trig_vec* trig_disconnect = attachment->att_triggers[DB_TRIGGER_DISCONNECT];
			if (!(attachment->att_flags & ATT_no_db_triggers) &&
				!(attachment->att_flags & ATT_shutdown) &&
				trig_disconnect && !trig_disconnect->isEmpty())
			{
				ThreadStatusGuard temp_status(tdbb);

				jrd_tra* transaction = NULL;
				const ULONG save_flags = attachment->att_flags;

				try
				{
					// Start a transaction to execute ON DISCONNECT triggers.
					// Ensure this transaction can't trigger auto-sweep.
					attachment->att_flags |= ATT_no_cleanup;
					transaction = TRA_start(tdbb, 0, NULL);
					attachment->att_flags = save_flags;

					// run ON DISCONNECT triggers
					EXE_execute_db_triggers(tdbb, transaction, jrd_req::req_trigger_disconnect);

					// and commit the transaction
					TRA_commit(tdbb, transaction, false);
				}
				catch (const Exception&)
				{
					attachment->att_flags = save_flags;
					if (dbb->dbb_flags & DBB_bugcheck)
						throw;

					try
					{
						if (transaction)
							TRA_rollback(tdbb, transaction, false, false);
					}
					catch (const Exception&)
					{
						if (dbb->dbb_flags & DBB_bugcheck)
							throw;
					}
				}
			}
		}
		catch (const Exception&)
		{
			attachment->att_flags |= (ATT_shutdown | ATT_purge_error);
			throw;
		}
	}

	try
	{
		// allow to free resources used by dynamic statements
		EDS::Manager::jrdAttachmentEnd(tdbb, attachment);

		const ULONG att_flags = attachment->att_flags;
		attachment->att_flags |= ATT_shutdown;

		if (!(dbb->dbb_flags & DBB_bugcheck))
		{
			// Check for any pending transactions
			unsigned int count = purge_transactions(tdbb, attachment, force_flag, att_flags);
			if (count)
			{
				ERR_post(Arg::Gds(isc_open_trans) << Arg::Num(count));
			}
		}
	}
	catch (const Exception&)
	{
		attachment->att_flags |= (ATT_shutdown | ATT_purge_error);
		throw;
	}

	// Notify Trace API manager about disconnect
	if (attachment->att_trace_manager->needs(TRACE_EVENT_DETACH))
	{
		TraceConnectionImpl conn(attachment);
		attachment->att_trace_manager->event_detach(&conn, false);
	}

	// Unlink attachment from database

	release_attachment(tdbb, attachment);

	// If there are still attachments, do a partial shutdown

	if (dbb->checkHandle())
	{
		if (!dbb->dbb_attachments && !(dbb->dbb_flags & DBB_being_opened))
		{
			shutdown_database(dbb, true);
		}
	}
}


static void run_commit_triggers(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	r u n _ c o m m i t _ t r i g g e r s
 *
 **************************************
 *
 * Functional description
 *	Run ON TRANSACTION COMMIT triggers of a transaction.
 *
 **************************************/
	SET_TDBB(tdbb);
	Jrd::Attachment* attachment = tdbb->getAttachment();

	if (transaction == attachment->getSysTransaction())
		return;

	// start a savepoint to rollback changes of all triggers
	VIO_start_save_point(tdbb, transaction);

	try
	{
		// run ON TRANSACTION COMMIT triggers
		EXE_execute_db_triggers(tdbb, transaction,
								jrd_req::req_trigger_trans_commit);
		VIO_verb_cleanup(tdbb, transaction);
	}
	catch (const Exception&)
	{
		if (!(tdbb->getDatabase()->dbb_flags & DBB_bugcheck))
		{
			// rollbacks the created savepoint
			++transaction->tra_save_point->sav_verb_count;
			VIO_verb_cleanup(tdbb, transaction);
		}
		throw;
	}
}


// verify_request_synchronization
//
// @brief Finds the sub-requests at the given level and replaces it with the
// original passed request (note the pointer by reference). If that specific
// sub-request is not found, throw the dreaded "request synchronization error".
// Notice that at this time, the calling function's "request" pointer has been
// set to null, so remember that if you write a debugging routine.
// This function replaced a chunk of code repeated four times.
//
// @param request The incoming, parent request to be replaced.
// @param level The level of the sub-request we need to find.
static jrd_req* verify_request_synchronization(JrdStatement* statement, USHORT level)
{
	if (level)
	{
		if (level >= statement->requests.getCount() || !statement->requests[level])
			ERR_post(Arg::Gds(isc_req_sync));
	}

	return statement->requests[level];
}


/**

 	verifyDatabaseName

    @brief	Verify database name for open/create
	against given in conf file list of available directories
	and security database name

    @param name
    @param status

 **/
static VdnResult verifyDatabaseName(const PathName& name, ISC_STATUS* status, bool is_alias)
{
	// Check for security2.fdb
	static GlobalPtr<PathName> securityNameBuffer, expandedSecurityNameBuffer;
	static GlobalPtr<Mutex> mutex;

	MutexLockGuard guard(mutex);

	if (!securityNameBuffer->hasData())
	{
		const RefPtr<Config> defConf(Config::getDefaultConfig());
		securityNameBuffer->assign(defConf->getSecurityDatabase());
		expandedSecurityNameBuffer->assign(securityNameBuffer);
		ISC_expand_filename(expandedSecurityNameBuffer, false);
	}

	if (name == securityNameBuffer || name == expandedSecurityNameBuffer)
		return VDN_SECURITY;

	// Check for .conf
	if (!JRD_verify_database_access(name)) {
		if (!is_alias) {
			ERR_build_status(status, Arg::Gds(isc_conf_access_denied) << Arg::Str("database") <<
																		 Arg::Str(name));
		}
		return VDN_FAIL;
	}
	return VDN_OK;
}


/**

	getUserInfo

    @brief	Almost stub-like now.
    Planned to take into an account mapping of users and groups.
	Fills UserId structure with resulting values.

    @param user
    @param options
    @param

 **/
static void getUserInfo(UserId& user, const DatabaseOptions& options, const RefPtr<Config>* config)
{
	bool wheel = false;
	int id = -1, group = -1;	// CVC: This var contained trash
	string name, trusted_role;

	if (fb_utils::bootBuild())
	{
		wheel = true;
	}
	else
	{
		if (options.dpb_trusted_login.hasData())
		{
			name = options.dpb_trusted_login;
		}
		else if (options.dpb_user_name.hasData())
		{
			name = options.dpb_user_name;
		}
		else if (options.dpb_auth_block.hasData())
		{
			// stub instead mapUser(....);
			AuthReader auth(options.dpb_auth_block);
			PathName secureDb;
			if (auth.getInfo(&name, NULL, &secureDb))
			{
				if (secureDb.hasData())
				{
					if (config && (secureDb != (*config)->getSecurityDatabase()))
					{
						(Arg::Gds(isc_login) << Arg::Gds(isc_random) << "No SecDb match").raise();
					}
				}
				else
				{
					auth.moveNext();
					auth.getInfo(&trusted_role, NULL, NULL);
				}
			}
		}
		else
		{
			wheel = ISC_get_user(&name, &id, &group);
			ISC_systemToUtf8(name);
			if (id == 0)
			{
				wheel = true;
			}
		}

		// if the name from the user database is defined as SYSDBA,
		// we define that user id as having system privileges

		name.upper();
		if (name == SYSDBA_USER_NAME)
		{
			wheel = true;
		}
	}

	// In case we became WHEEL on an OS that didn't require name SYSDBA,
	// (Like Unix) force the effective Database User name to be SYSDBA

	if (wheel)
	{
		name = SYSDBA_USER_NAME;
	}

	if (name.length() > USERNAME_LENGTH)
	{
		status_exception::raise(Arg::Gds(isc_long_login) << Arg::Num(name.length())
														 << Arg::Num(USERNAME_LENGTH));
	}

	user.usr_user_name = name;
	user.usr_project_name = "";
	user.usr_org_name = "";
	user.usr_user_id = id;
	user.usr_group_id = group;
	user.usr_auth_block.assign(options.dpb_auth_block);

	if (wheel)
	{
		user.usr_flags |= USR_locksmith;
	}

	if (options.dpb_role_name.hasData())
	{
		user.usr_sql_role_name = options.dpb_role_name;
	}
	else if (trusted_role.hasData())
	{
		user.usr_sql_role_name = trusted_role;
		user.usr_flags |= USR_trole;
	}
}

static ISC_STATUS unwindAttach(thread_db* tdbb, const Exception& ex, Firebird::IStatus* userStatus,
	Jrd::Attachment* attachment, Database* dbb)
{
	transliterateException(tdbb, ex, userStatus);

	try
	{
		if (!engineShuttingDown)
		{
			ThreadStatusGuard temp_status(tdbb);

			dbb->dbb_flags &= ~DBB_being_opened;

			if (attachment)
			{
				release_attachment(tdbb, attachment);
			}

			if (dbb->checkHandle())
			{
				if (!dbb->dbb_attachments)
				{
					shutdown_database(dbb, true);
				}
				else
				{
					dbb->dbb_sync.unlock();
				}
			}
		}
	}
	catch (const Exception&)
	{
		// no-op
	}

	return userStatus->get()[1];
}

static THREAD_ENTRY_DECLARE shutdown_thread(THREAD_ENTRY_PARAM arg)
{
/**************************************
 *
 *	s h u t d o w n _ t h r e a d
 *
 **************************************
 *
 * Functional description
 *	Shutdown the engine.
 *
 **************************************/
	Semaphore* const semaphore = static_cast<Semaphore*>(arg);

	bool success = true;

	try
	{
		ThreadContextHolder tdbb;

		// Shutdown external datasets manager
		EDS::Manager::shutdown();

		{ // scope
			MutexLockGuard guard(databases_mutex);

			cancel_attachments(tdbb);

			Database* dbb_next;
			for (Database* dbb = databases; dbb; dbb = dbb_next)
			{
				dbb_next = dbb->dbb_next;
				if (!shutdown_dbb(tdbb, dbb))
				{
					success = false;
					break;
				}
			}
		}

		Service::shutdownServices();
	}
	catch (const Exception&)
	{
		success = false;
	}

	if (success && semaphore)
	{
		semaphore->release();
	}

	return 0;
}


// begin thread_db methods

void thread_db::setDatabase(Database* val)
{
	if (database != val)
	{
		const bool wasActive = database && (priorThread || nextThread || database->dbb_active_threads == this);

		if (wasActive)
		{
			deactivate();
		}

		database = val;
		dbbStat = val ? &val->dbb_stats : RuntimeStatistics::getDummy();

		if (wasActive)
		{
			activate();
		}
	}
}

// need the Jrd:: qualifier to not clash with Attachment in FirebirdApi.h
void thread_db::setAttachment(Jrd::Attachment* val)
{
	attachment = val;
	attStat = val ? &val->att_stats : RuntimeStatistics::getDummy();
}

void thread_db::setTransaction(jrd_tra* val)
{
	transaction = val;
	traStat = val ? &val->tra_stats : RuntimeStatistics::getDummy();
}

void thread_db::setRequest(jrd_req* val)
{
	request = val;
	reqStat = val ? &val->req_stats : RuntimeStatistics::getDummy();
}

SSHORT thread_db::getCharSet() const
{
	if (request && request->charSetId != CS_dynamic)
		return request->charSetId;

	return attachment->att_charset;
}

bool thread_db::checkCancelState(bool punt)
{
	// Test various flags and unwind/throw if required.
	// But do that only if we're neither in the verb cleanup state
	// nor currently detaching, as these actions should never be interrupted.
	// Also don't break wait in LM if it is not safe.

	if (tdbb_flags & (TDBB_verb_cleanup | TDBB_detaching | TDBB_wait_cancel_disable))
		return false;

	if (attachment)
	{
		if (attachment->att_flags & ATT_shutdown)
		{
			if (database->dbb_ast_flags & DBB_shutdown)
			{
				if (!punt)
					return true;

				status_exception::raise(Arg::Gds(isc_shutdown) <<
										Arg::Str(attachment->att_filename));
			}
			else if (!(tdbb_flags & TDBB_shutdown_manager))
			{
				if (!punt)
					return true;

				status_exception::raise(Arg::Gds(isc_att_shutdown));
			}
		}

		// If a cancel has been raised, defer its acknowledgement
		// when executing in the context of an internal request or
		// the system transaction.

		if ((attachment->att_flags & ATT_cancel_raise) &&
			!(attachment->att_flags & ATT_cancel_disable))
		{
			if ((!request ||
					!(request->getStatement()->flags &
						(JrdStatement::FLAG_INTERNAL | JrdStatement::FLAG_SYS_TRIGGER))) &&
				(!transaction || !(transaction->tra_flags & TRA_system)))
			{
				if (!punt)
					return true;

				attachment->att_flags &= ~ATT_cancel_raise;
				status_exception::raise(Arg::Gds(isc_cancelled));
			}
		}
	}

	// Handle request cancellation

	if (transaction && (transaction->tra_flags & TRA_cancel_request))
	{
		if (!punt)
			return true;

		transaction->tra_flags &= ~TRA_cancel_request;
		status_exception::raise(Arg::Gds(isc_cancelled));
	}

	// Check the thread state for already posted system errors. If any still persists,
	// then someone tries to ignore our attempts to interrupt him. Let's insist.

	if (tdbb_flags & TDBB_sys_error)
	{
		if (!punt)
			return true;

		status_exception::raise(Arg::Gds(isc_cancelled));
	}

	return false;
}

// end thread_db methods


void JRD_autocommit_ddl(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ a u t o c o m m i t _ d d l
 *
 **************************************
 *
 * Functional description
 *
 **************************************/

	// Perform an auto commit for autocommit transactions.
	// This is slightly tricky. If the commit retain works,
	// all is well. If TRA_commit() fails, we perform
	// a rollback_retain(). This will backout the
	// effects of the transaction, mark it dead and
	// start a new transaction.

	if (transaction->tra_flags & TRA_perform_autocommit)
	{
		transaction->tra_flags &= ~TRA_perform_autocommit;

		try
		{
			TRA_commit(tdbb, transaction, true);
		}
		catch (const Exception&)
		{
			try
			{
				ThreadStatusGuard temp_status(tdbb);

				TRA_rollback(tdbb, transaction, true, false);
			}
			catch (const Exception&)
			{
				// no-op
			}

			throw;
		}
	}
}


void JRD_receive(thread_db* tdbb, jrd_req* request, USHORT msg_type, ULONG msg_length, UCHAR* msg)
{
/**************************************
 *
 *	J R D _ r e c e i v e
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	EXE_receive(tdbb, request, msg_type, msg_length, msg, true);

	check_autocommit(request, tdbb);

	if (request->req_flags & req_warning)
	{
		request->req_flags &= ~req_warning;
		ERR_punt();
	}
}


void JRD_send(thread_db* tdbb, jrd_req* request, USHORT msg_type, ULONG msg_length, const UCHAR* msg)
{
/**************************************
 *
 *	J R D _ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	EXE_send(tdbb, request, msg_type, msg_length, msg);

	check_autocommit(request, tdbb);

	if (request->req_flags & req_warning)
	{
		request->req_flags &= ~req_warning;
		ERR_punt();
	}
}


void JRD_start(Jrd::thread_db* tdbb, jrd_req* request, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ s t a r t
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	EXE_unwind(tdbb, request);
	EXE_start(tdbb, request, transaction);

	check_autocommit(request, tdbb);

	if (request->req_flags & req_warning)
	{
		request->req_flags &= ~req_warning;
		ERR_punt();
	}
}


void JRD_commit_transaction(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ c o m m i t _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction and keep the environment valid.
 *
 **************************************/
	commit(tdbb, transaction, false);
}


void JRD_commit_retaining(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ c o m m i t _ r e t a i n i n g
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/
	commit(tdbb, transaction, true);
}


void JRD_rollback_transaction(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ r o l l b a c k _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction.
 *
 **************************************/
	rollback(tdbb, transaction, false);
}


void JRD_rollback_retaining(thread_db* tdbb, jrd_tra* transaction)
{
/**************************************
 *
 *	J R D _ r o l l b a c k _ r e t a i n i n g
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction but keep the environment valid
 *
 **************************************/
	rollback(tdbb, transaction, true);
}


void JRD_start_and_send(thread_db* tdbb, jrd_req* request, jrd_tra* transaction,
	USHORT msg_type, ULONG msg_length, const UCHAR* msg)
{
/**************************************
 *
 *	J R D _ s t a r t _ a n d _ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	EXE_unwind(tdbb, request);
	EXE_start(tdbb, request, transaction);
	EXE_send(tdbb, request, msg_type, msg_length, msg);

	check_autocommit(request, tdbb);

	if (request->req_flags & req_warning)
	{
		request->req_flags &= ~req_warning;
		ERR_punt();
	}
}


static void start_transaction(thread_db* tdbb, bool transliterate, jrd_tra** tra_handle,
	Jrd::Attachment* attachment, unsigned int tpb_length, const UCHAR* tpb)
{
/**************************************
 *
 *	s t a r t _ m u l t i p l e
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	fb_assert(attachment == tdbb->getAttachment());

	try
	{
		if (*tra_handle)
			status_exception::raise(Arg::Gds(isc_bad_trans_handle));


		try
		{
			if (tpb_length > 0 && !tpb)
				status_exception::raise(Arg::Gds(isc_bad_tpb_form));

			jrd_tra* transaction = TRA_start(tdbb, tpb_length, tpb);

			transaction->tra_sibling = NULL;
			*tra_handle = transaction;

			// run ON TRANSACTION START triggers
			EXE_execute_db_triggers(tdbb, transaction, jrd_req::req_trigger_trans_start);
		}
		catch (const Exception& ex)
		{
			if (transliterate)
			{
				LocalStatus tempStatus;
				transliterateException(tdbb, ex, &tempStatus);
				status_exception::raise(tempStatus.get());
			}
			throw;
		}
	}
	catch (const Exception&)
	{
		*tra_handle = NULL;
		throw;
	}
}


void JRD_start_transaction(thread_db* tdbb, jrd_tra** transaction,
   Jrd::Attachment* attachment, unsigned int tpb_length, const UCHAR* tpb)
{
/**************************************
 *
 *	J R D _ s t a r t _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	start_transaction(tdbb, false, transaction, attachment, tpb_length, tpb);
}


void JRD_unwind_request(thread_db* tdbb, jrd_req* request)
{
/**************************************
 *
 *	J R D _ u n w i n d _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	Unwind a running request.  This is potentially nasty since it can
 *	be called asynchronously.
 *
 **************************************/
	// Unwind request. This just tweaks some bits.
	EXE_unwind(tdbb, request);
}


void JRD_compile(thread_db* tdbb,
				 Jrd::Attachment* attachment,
				 jrd_req** req_handle,
				 ULONG blr_length,
				 const UCHAR* blr,
				 RefStrPtr ref_str,
				 ULONG dbginfo_length,
				 const UCHAR* dbginfo,
				 bool isInternalRequest)
{
/**************************************
 *
 *	J R D _ c o m p i l e
 *
 **************************************
 *
 * Functional description
 *	Compile a request passing the SQL text and debug information.
 *
 **************************************/
	if (*req_handle)
		status_exception::raise(Arg::Gds(isc_bad_req_handle));

	jrd_req* request = CMP_compile2(tdbb, blr, blr_length, isInternalRequest, dbginfo_length, dbginfo);
	request->req_attachment = attachment;
	attachment->att_requests.add(request);

	JrdStatement* statement = request->getStatement();

	if (!ref_str)
	{
		fb_assert(statement->blr.isEmpty());

		// hvlad: if\when we implement request's cache in the future and
		// CMP_compile2 will return us previously compiled request with
		// non-empty req_blr, then we must replace assertion by the line below
		// if (!statement->req_blr.isEmpty())

		statement->blr.insert(0, blr, blr_length);
	}
	else
		statement->sqlText = ref_str;

	*req_handle = request;
}


namespace
{
	class DatabaseDirectoryList : public DirectoryList
	{
	private:
		const PathName getConfigString() const
		{
			return PathName(Config::getDatabaseAccess());
		}
	public:
		explicit DatabaseDirectoryList(MemoryPool& p)
			: DirectoryList(p)
		{
			initialize();
		}
	};

	InitInstance<DatabaseDirectoryList> iDatabaseDirectoryList;
}


bool JRD_verify_database_access(const PathName& name)
{
/**************************************
 *
 *      J R D _ v e r i f y _ d a t a b a s e _ a c c e s s
 *
 **************************************
 *
 * Functional description
 *      Verify 'name' against DatabaseAccess entry of firebird.conf.
 *
 **************************************/
	return iDatabaseDirectoryList().isPathInList(name);
}


#if 0
namespace
{
	typedef Array<FB_API_HANDLE> PingQueue;

	THREAD_ENTRY_DECLARE attachmentShutdownThread(THREAD_ENTRY_PARAM arg)
	{
		AutoPtr<PingQueue> queue(static_cast<PingQueue*>(arg));

		while (!queue->isEmpty())
		{
			FB_API_HANDLE public_handle = queue->pop();
			ISC_STATUS_ARRAY local_status = {isc_arg_gds, FB_SUCCESS, isc_arg_end};
			fb_ping(local_status, &public_handle);
		}

		return 0;
	}
} // namespace
#endif


void JRD_shutdown_attachments(Database* dbb)
{
/**************************************
 *
 *      J R D _ s h u t d o w n _ a t t a c h m e n t s
 *
 **************************************
 *
 * Functional description
 *  Schedule the attachments marked as shutdown for disconnection.
 *
 **************************************/
	fb_assert(dbb);

#if 0	//// FIXME:
	try
	{
		MemoryPool& pool = *getDefaultMemoryPool();
		PingQueue* const queue = FB_NEW(pool) PingQueue(pool);

		Sync guard(&dbb->dbb_sync, "JRD_shutdown_attachments");
		if (!dbb->dbb_sync.ourExclusiveLock())
			guard.lock(SYNC_SHARED);

		for (const Jrd::Attachment* attachment = dbb->dbb_attachments;
			attachment; attachment = attachment->att_next)
		{
			if (attachment->att_flags & ATT_shutdown)
			{
				queue->add(attachment->att_public_handle);
			}
		}

		Thread::start(attachmentShutdownThread, queue, 0);
	}
	catch (const Exception&)
	{} // no-op
#endif
}


void JRD_cancel_operation(thread_db* tdbb, Jrd::Attachment* attachment, int option)
{
/**************************************
 *
 *	J R D _ c a n c e l _ o p e r a t i o n
 *
 **************************************
 *
 * Functional description
 *	Try to cancel an operation.
 *
 **************************************/
	switch (option)
	{
	case fb_cancel_disable:
		attachment->att_flags |= ATT_cancel_disable;
		attachment->att_flags &= ~ATT_cancel_raise;
		break;

	case fb_cancel_enable:
		if (attachment->att_flags & ATT_cancel_disable)
		{
			// avoid leaving ATT_cancel_raise set when cleaning ATT_cancel_disable
			// to avoid unexpected CANCEL (though it should not be set, but...)
			attachment->att_flags &= ~(ATT_cancel_disable | ATT_cancel_raise);
		}
		break;

	case fb_cancel_raise:
		if (!(attachment->att_flags & ATT_cancel_disable))
		{
			attachment->att_flags |= ATT_cancel_raise;
			attachment->cancelExternalConnection(tdbb);
			LCK_cancel_wait(attachment);
		}
		break;

	default:
		fb_assert(false);
	}
}