firebird-mirror/src/jrd/jrd.cpp

/*
 *	PROGRAM:	JRD Access Method
 *	MODULE:		jrd.c
 *	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
 *
 */

#ifdef SHLIB_DEFS
#define LOCAL_SHLIB_DEFS
#endif

#include "firebird.h"
#include "../jrd/ib_stdio.h"
#include <string.h>
#include <stdlib.h>
#include "../jrd/common.h"
#include "../jrd/os/thd_priority.h"
#include <stdarg.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <errno.h>

#define JRD_MAIN
#include "../jrd/gds.h"
#include "../jrd/jrd.h"
#include "../jrd/irq.h"
#include "../jrd/isc.h"
#include "../jrd/drq.h"
#include "../jrd/req.h"
#include "../jrd/tra.h"
#include "../jrd/blb.h"
#include "../jrd/lck.h"
#include "../jrd/scl.h"
#include "../jrd/license.h"
#include "../jrd/pio.h"
#include "../jrd/ods.h"
#include "../jrd/exe.h"
#include "../jrd/val.h"
#include "../jrd/rse.h"
#include "../jrd/jrn.h"
#include "../jrd/all.h"
#include "../jrd/log.h"
#include "../jrd/fil.h"
#include "../jrd/sbm.h"
#include "../jrd/svc.h"
#include "../jrd/sdw.h"
#include "../jrd/lls.h"
#include "../jrd/cch.h"
#include "../jrd/iberr.h"
#include "../jrd/jrd_time.h"
#include "../intl/charsets.h"
#include "../jrd/all_proto.h"
#include "../jrd/blb_proto.h"
#include "../jrd/cch_proto.h"
#include "../jrd/cmp_proto.h"
#include "../jrd/dbg_proto.h"
#include "../jrd/dls_proto.h"
#include "../jrd/dyn_proto.h"
#include "../jrd/err_proto.h"
#include "../jrd/exe_proto.h"
#include "../jrd/ext_proto.h"
#include "../jrd/flu_proto.h"
#include "../jrd/fun_proto.h"
#include "../jrd/gds_proto.h"
#include "../jrd/iberr_proto.h"
#include "../jrd/inf_proto.h"
#include "../jrd/ini_proto.h"
#include "../jrd/intl_proto.h"
#include "../jrd/inuse_proto.h"
#include "../jrd/isc_f_proto.h"
#include "../jrd/isc_proto.h"
#include "../jrd/jrd_proto.h"
#include "../jrd/jrn_proto.h"

#include "../jrd/lck_proto.h"
#include "../jrd/log_proto.h"
#include "../jrd/met_proto.h"
#include "../jrd/mov_proto.h"
#include "../jrd/pag_proto.h"
#include "../jrd/par_proto.h"
#include "../jrd/pio_proto.h"
#include "../jrd/sbm_proto.h"
#include "../jrd/sch_proto.h"
#include "../jrd/scl_proto.h"
#include "../jrd/sdw_proto.h"
#include "../jrd/shut_proto.h"
#include "../jrd/sort_proto.h"
#include "../jrd/svc_proto.h"
#include "../jrd/thd_proto.h"
#include "../jrd/tra_proto.h"
#include "../jrd/val_proto.h"
#include "../jrd/file_params.h"
#include "../jrd/ail.h"
#include "../jrd/event_proto.h"
#include "../jrd/old_proto.h"
#include "../jrd/flags.h"

#include "../common/config/config.h"
#include "../jrd/plugin_manager.h"

#ifdef GARBAGE_THREAD
#include "vio_proto.h"
#endif

#ifdef SERVER_SHUTDOWN
extern "C" {
typedef struct dbf {
	struct dbf *dbf_next;
	USHORT dbf_length;
	TEXT dbf_data[2];
} *DBF;

} // extern "C"

#include "../jrd/sort.h"
#endif /* SERVER_SHUTDOWN */

#define	WAIT_PERIOD	-1

#ifdef SUPPORT_RAW_DEVICES
#define unlink PIO_unlink
#endif

#ifdef SUPERSERVER
#define V4_THREADING

/*TMN: fwd. decl. SHOULD BE IN A HEADER FILE*/
void ALL_print_memory_pool_info(IB_FILE * fptr, DBB databases);
void ALLD_print_memory_pool_info(IB_FILE * fptr);
extern "C" {
void gds_print_delta_counters(IB_FILE *);
} // extern "C"

#endif /* SUPERSERVER */

# ifdef V4_THREADING
#  undef V4_INIT
#  undef V4_GLOBAL_MUTEX_LOCK
#  undef V4_GLOBAL_MUTEX_UNLOCK
#  undef V4_MUTEX_INIT
#  undef V4_MUTEX_LOCK
#  undef V4_MUTEX_UNLOCK
#  undef V4_MUTEX_DESTROY
#  undef V4_JRD_MUTEX_LOCK
#  undef V4_JRD_MUTEX_UNLOCK
#  define V4_INIT			THD_INIT
#  define V4_GLOBAL_MUTEX_LOCK	{THREAD_EXIT; THD_GLOBAL_MUTEX_LOCK; THREAD_ENTER;}
#  define V4_GLOBAL_MUTEX_UNLOCK	THD_GLOBAL_MUTEX_UNLOCK
#  define V4_MUTEX_INIT(mutx)	THD_MUTEX_INIT (mutx)
#  define V4_MUTEX_LOCK(mutx)	{THREAD_EXIT; THD_MUTEX_LOCK (mutx); THREAD_ENTER;}
#  define V4_MUTEX_UNLOCK(mutx)	THD_MUTEX_UNLOCK (mutx)
#  define V4_MUTEX_DESTROY(mutx)	THD_MUTEX_DESTROY (mutx)
#  ifndef SUPERSERVER
#   define V4_JRD_MUTEX_LOCK(mutx)	{THREAD_EXIT; THD_JRD_MUTEX_LOCK (mutx); THREAD_ENTER;}
#   define V4_JRD_MUTEX_UNLOCK(mutx) THD_JRD_MUTEX_UNLOCK (mutx)
#  endif /* SUPERSERVER */
# endif /* V4_THREADING */

// BRS. 03/23/2003
// Those two macros are defined in thd.h when V4_THREADING is true, but thd.h is included
// before V4_THREADING is defined, so the two must be defined as empty if not defined 
// to allow the use of V4_THREADING ifdefs
// The include chain is
// os/thd_priority.h -> thd.h
#if defined(V4_THREADING) && !defined(V4_RW_LOCK_DESTROY_N)
#   define V4_RW_LOCK_DESTROY_N(wlck,n)
#   define V4_RW_LOCK_INIT_N(wlck,n)
#endif

#ifdef SUPERSERVER

extern "C" {
extern SLONG trace_pools;
static REC_MUTX_T databases_rec_mutex;
} // extern "C"

// BRS. 03/23/2003
// Those empty defines was substituted with #if defined(V4_THREADING) && !defined(SUPERSERVER)
//#define V4_JRD_MUTEX_LOCK(mutx)
//#define V4_JRD_MUTEX_UNLOCK(mutx)

#define JRD_SS_INIT_MUTEX       THD_rec_mutex_init (&databases_rec_mutex)
#define JRD_SS_DESTROY_MUTEX    THD_rec_mutex_destroy (&databases_rec_mutex)
#define JRD_SS_MUTEX_LOCK       {THREAD_EXIT;\
                                 THD_rec_mutex_lock (&databases_rec_mutex);\
                                 THREAD_ENTER;}
#define JRD_SS_MUTEX_UNLOCK     THD_rec_mutex_unlock (&databases_rec_mutex)
#define JRD_SS_THD_MUTEX_LOCK   THD_rec_mutex_lock (&databases_rec_mutex)
#define JRD_SS_THD_MUTEX_UNLOCK THD_rec_mutex_unlock (&databases_rec_mutex)

#else
#define JRD_SS_INIT_MUTEX
#define JRD_SS_DESTROY_MUTEX
#define JRD_SS_MUTEX_LOCK
#define JRD_SS_MUTEX_UNLOCK
#define JRD_SS_THD_MUTEX_LOCK
#define JRD_SS_THD_MUTEX_UNLOCK
#endif

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

void trig::compile(tdbb* _tdbb)
{
	if (!request && !compile_in_progress)
	{
		SET_TDBB(_tdbb);

		compile_in_progress = TRUE;
		JrdMemoryPool* old_pool = _tdbb->tdbb_default,
			*new_pool = JrdMemoryPool::createPool();
		/* Allocate statement memory pool */
		_tdbb->tdbb_default = new_pool;
		// Trigger request is not compiled yet. Lets do it now
		try {
			PAR_blr(_tdbb, relation, blr->str_data, 
					(CSB)NULL_PTR, (CSB*)NULL_PTR, &request, TRUE, 
					(USHORT)(flags & TRG_ignore_perm ? csb_ignore_perm : 0));
			_tdbb->tdbb_default = old_pool;
		}
		catch (const std::exception&) {
			_tdbb->tdbb_default = old_pool;
			compile_in_progress = FALSE;
			if (request) {
				CMP_release(_tdbb,request);
				request = NULL;
			} else {
				JrdMemoryPool::deletePool(new_pool);
			}
			throw;
		}
		_tdbb->tdbb_default = old_pool;
		
		if (name)
			request->req_trg_name = (TEXT *)name->str_data;
		if (sys_trigger)
			request->req_flags |= req_sys_trigger;
		if (flags & TRG_ignore_perm)
			request->req_flags |= req_ignore_perm;

		compile_in_progress = FALSE;
	}
}

BOOLEAN trig::release(tdbb* _tdbb)
{
	if (!blr/*sys_trigger*/ || !request || CMP_clone_active(request)) {
		return FALSE;
	}
	
	CMP_release(_tdbb, request);
	request = NULL;
	return TRUE;
}

extern "C" {


#ifdef WIN_NT
#define	SYS_ERR		gds_arg_win32
#endif


#ifndef SYS_ERR
#define SYS_ERR		gds_arg_unix
#endif


/* Option block for database parameter block */

typedef struct dpb
{
	TEXT*	dpb_sys_user_name;
	TEXT*	dpb_user_name;
	TEXT*	dpb_password;
	TEXT*	dpb_password_enc;
	TEXT*	dpb_role_name;
	TEXT*	dpb_journal;
	TEXT*	dpb_key;
	TEXT*	dpb_log;
	TEXT*	dpb_wal_backup_dir;
	USHORT	dpb_wal_action;
	USHORT	dpb_online_dump;
	ULONG	dpb_old_file_size;
	USHORT	dpb_old_num_files;
	ULONG	dpb_old_start_page;
	ULONG	dpb_old_start_seqno;
	USHORT	dpb_old_start_file;
	TEXT*	dpb_old_file[MAX_OLD_FILES];
	USHORT	dpb_old_dump_id;
	SLONG	dpb_wal_chkpt_len;
	SSHORT	dpb_wal_num_bufs;
	USHORT	dpb_wal_bufsize;
	SLONG	dpb_wal_grp_cmt_wait;
	SLONG	dpb_sweep_interval;
	ULONG	dpb_page_buffers;
	BOOLEAN	dpb_set_page_buffers;
	ULONG dpb_buffers;
	USHORT	dpb_debug;
	USHORT	dpb_verify;
	USHORT	dpb_sweep;
	USHORT	dpb_trace;
	USHORT	dpb_disable;
	USHORT	dpb_dbkey_scope;
	USHORT	dpb_page_size;
	USHORT	dpb_activate_shadow;
	USHORT	dpb_delete_shadow;
	USHORT	dpb_no_garbage;
	USHORT	dpb_quit_log;
	USHORT	dpb_shutdown;
	SSHORT	dpb_shutdown_delay;
	USHORT	dpb_online;
	SSHORT	dpb_force_write;
	UCHAR	dpb_set_force_write;
	UCHAR	dpb_no_reserve;
	UCHAR	dpb_set_no_reserve;
	SSHORT	dpb_interp;
	TEXT*	dpb_lc_messages;
	TEXT*	dpb_lc_ctype;
	USHORT	dpb_single_user;
	BOOLEAN	dpb_overwrite;
	BOOLEAN	dpb_sec_attach;
	BOOLEAN	dpb_disable_wal;
	SLONG	dpb_connect_timeout;
	SLONG	dpb_dummy_packet_interval;
	SSHORT	dpb_db_readonly;
	BOOLEAN	dpb_set_db_readonly;
	BOOLEAN	dpb_gfix_attach;
	BOOLEAN	dpb_gstat_attach;
	TEXT*	dpb_gbak_attach;
	TEXT*	dpb_working_directory;
	USHORT	dpb_sql_dialect;
	USHORT	dpb_set_db_sql_dialect;
	TEXT*	dpb_set_db_charset;
} DPB;

static BLB		check_blob(TDBB, STATUS*, BLB*);
static STATUS	check_database(TDBB, ATT, STATUS*);
static void		cleanup(void*);
static STATUS	commit(STATUS*, JRD_TRA*, USHORT);
static STR		copy_string(TEXT*, USHORT);
static BOOLEAN	drop_files(FIL);
static STATUS	error(STATUS*);
static void		find_intl_charset(TDBB, ATT, DPB*);
static JRD_TRA		find_transaction(TDBB, JRD_TRA, STATUS);
static void		get_options(UCHAR *, USHORT, TEXT **, ULONG, DPB *);
static SLONG	get_parameter(UCHAR**);
static TEXT*	get_string_parameter(UCHAR **, TEXT **, ULONG *);
static STATUS	handle_error(STATUS*, STATUS, TDBB);
static bool		verify_database_name(TEXT *, STATUS *);

#if defined (WIN_NT)
#ifdef SERVER_SHUTDOWN
static void		ExtractDriveLetter(TEXT*, ULONG*);
#else // SERVER_SHUTDOWN
static void		setup_NT_handlers(void);
static BOOLEAN	handler_NT(SSHORT);
#endif	// SERVER_SHUTDOWN
#endif	// WIN_NT

static DBB		init(TDBB, STATUS*, TEXT*, USHORT);
static void		make_jrn_data(UCHAR*, USHORT*, TEXT*, USHORT, TEXT*, USHORT);
static STATUS	prepare(TDBB, JRD_TRA, STATUS*, USHORT, UCHAR*);
static void		release_attachment(ATT);
static STATUS	return_success(TDBB);
static BOOLEAN	rollback(TDBB, JRD_TRA, STATUS*, USHORT);

static void		shutdown_database(DBB, BOOLEAN);
static void		strip_quotes(TEXT*, TEXT*);
static void		purge_attachment(TDBB, STATUS *, ATT, BOOLEAN);

static int		initialized = 0;
static DBB		databases = NULL;
#if defined(V4_THREADING) && !defined(SUPERSERVER)
static MUTX_T	databases_mutex[1];
#endif
static ULONG	JRD_cache_default;

#ifdef GOVERNOR
#define ATTACHMENTS_PER_USER 1
static ULONG JRD_max_users = 0;
static ULONG num_attached = 0;
#endif /* GOVERNOR */


#if !defined(REQUESTER) && !defined(SHLIB_DEFS)

int		debug;
IHNDL	internal_db_handles = 0;

#endif	// !REQUESTER && !SHLIB_DEFS */


//____________________________________________________________
//
// 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, struct tdbb* tdbb)
{
	/* dimitr: we should ignore autocommit for requests
			   created by EXECUTE STATEMENT */
	if (request->req_transaction->tra_callback_count > 0)
		return;

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

inline static void api_entry_point_init(STATUS* user_status)
{
	user_status[0] = gds_arg_gds;
	user_status[1] = FB_SUCCESS;
	user_status[2] = gds_arg_end;
}

inline static struct tdbb* set_thread_data(struct tdbb& thd_context)
{
	struct tdbb* tdbb = &thd_context;
	MOVE_CLEAR(tdbb, sizeof(struct tdbb));
	JRD_set_context(tdbb);
	return tdbb;
}


#undef GET_THREAD_DATA
#undef CHECK_DBB
#undef GET_DBB
#undef SET_TDBB

static TDBB get_thread_data()
{
	THDD p1 = (THDD)(PLATFORM_GET_THREAD_DATA);
#ifdef DEV_BUILD
	if (p1 && p1->thdd_type == THDD_TYPE_TDBB)
	{
		TDBB p2 = (TDBB)p1;
		if (p2->tdbb_database &&
			MemoryPool::blk_type(p2->tdbb_database) != type_dbb)
		{
			BUGCHECK(147);
		}
	}
#endif	// DEV_BUILD

	return (TDBB)p1;
}

inline static void CHECK_DBB(DBB dbb)
{
#ifdef DEV_BUILD
	assert(dbb && MemoryPool::blk_type(dbb) == type_dbb);
#endif	// DEV_BUILD
}

inline static void check_tdbb(TDBB tdbb)
{
#ifdef DEV_BUILD
	assert(tdbb &&
			(reinterpret_cast<THDD>(tdbb)->thdd_type == THDD_TYPE_TDBB) &&
			(!tdbb->tdbb_database ||
				MemoryPool::blk_type(tdbb->tdbb_database) == type_dbb));
#endif	// DEV_BUILD
}

inline static DBB get_dbb()
{
	return get_thread_data()->tdbb_database;
}

static void SET_TDBB(TDBB& tdbb)
{
	if (tdbb == NULL_TDBB) {
		tdbb = get_thread_data();
	}
	check_tdbb(tdbb);
}


#define CHECK_HANDLE(blk,type,error)					\
	if (!blk || MemoryPool::blk_type(blk) != type)	\
		return handle_error (user_status, error, tdbb)

#define NULL_CHECK(ptr,code)									\
	if (*ptr) return handle_error (user_status, code, tdbb)



#define SWEEP_INTERVAL		20000
#define	DPB_EXPAND_BUFFER	2048

#define	DBL_QUOTE			'\042'
#define	SINGLE_QUOTE		'\''
#define	BUFFER_LENGTH128	128
BOOLEAN invalid_client_SQL_dialect = FALSE;

#define GDS_ATTACH_DATABASE		jrd8_attach_database
#define GDS_BLOB_INFO			jrd8_blob_info
#define GDS_CANCEL_BLOB			jrd8_cancel_blob
#define GDS_CANCEL_EVENTS		jrd8_cancel_events
#define GDS_CANCEL_OPERATION	jrd8_cancel_operation
#define GDS_CLOSE_BLOB			jrd8_close_blob
#define GDS_COMMIT				jrd8_commit_transaction
#define GDS_COMMIT_RETAINING	jrd8_commit_retaining
#define GDS_COMPILE				jrd8_compile_request
#define GDS_CREATE_BLOB2		jrd8_create_blob2
#define GDS_CREATE_DATABASE		jrd8_create_database
#define GDS_DATABASE_INFO		jrd8_database_info
#define GDS_DDL					jrd8_ddl
#define GDS_DETACH				jrd8_detach_database
#define GDS_DROP_DATABASE		jrd8_drop_database
#define GDS_GET_SEGMENT			jrd8_get_segment
#define GDS_GET_SLICE			jrd8_get_slice
#define GDS_OPEN_BLOB2			jrd8_open_blob2
#define GDS_PREPARE				jrd8_prepare_transaction
#define GDS_PUT_SEGMENT			jrd8_put_segment
#define GDS_PUT_SLICE			jrd8_put_slice
#define GDS_QUE_EVENTS			jrd8_que_events
#define GDS_RECONNECT			jrd8_reconnect_transaction
#define GDS_RECEIVE				jrd8_receive
#define GDS_RELEASE_REQUEST		jrd8_release_request
#define GDS_REQUEST_INFO		jrd8_request_info
#define GDS_ROLLBACK			jrd8_rollback_transaction
#define GDS_ROLLBACK_RETAINING	jrd8_rollback_retaining
#define GDS_SEEK_BLOB			jrd8_seek_blob
#define GDS_SEND				jrd8_send
#define GDS_SERVICE_ATTACH		jrd8_service_attach
#define GDS_SERVICE_DETACH		jrd8_service_detach
#define GDS_SERVICE_QUERY		jrd8_service_query
#define GDS_SERVICE_START		jrd8_service_start
#define GDS_START_AND_SEND		jrd8_start_and_send
#define GDS_START				jrd8_start_request
#define GDS_START_MULTIPLE		jrd8_start_multiple
#define GDS_START_TRANSACTION	jrd8_start_transaction
#define GDS_TRANSACT_REQUEST	jrd8_transact_request
#define GDS_TRANSACTION_INFO	jrd8_transaction_info
#define GDS_UNWIND				jrd8_unwind_request


/* 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

static const char* CRYPT_IMAGE = "fbcrypt";
static const char* ENCRYPT = "encrypt";
static const char* DECRYPT = "decrypt";


#ifdef SHLIB_DEFS
} // extern "C"
/**  Use shdef.h which has all shared lib defs **/
#include "shdef.h"
extern "C" {
#endif


/* every GDS function now has a DLL_EXPORT */


STATUS DLL_EXPORT GDS_ATTACH_DATABASE(STATUS*	user_status,
									  SSHORT	file_length,
									  TEXT*		file_name,
									  ATT*		handle,
									  SSHORT	dpb_length,
									  UCHAR*	dpb,
									  TEXT*		expanded_filename)
{
/**************************************
 *
 *	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.
 *
 **************************************/
	DBB dbb;
	TEXT opt_buffer[DPB_EXPAND_BUFFER];
	TEXT alias_buffer[MAXPATHLEN];
	TEXT file_name_buffer[MAXPATHLEN];
	TEXT temp_buffer[MAXPATHLEN];
	extern bool ResolveDatabaseAlias(const char*, char*);

	SSHORT first;
	STATUS temp_status[ISC_STATUS_LENGTH], *status;
	DPB options;
	ATT attachment;
	USHORT d_len, jd_len;

	struct tdbb thd_context;

	TEXT		local_role_name[BUFFER_LENGTH128];
	UCHAR*		p1;
	UCHAR*		p2;
	SSHORT		cnt;
	SSHORT		len;

	api_entry_point_init(user_status);

	if (*handle) {
		return handle_error(user_status, gds_bad_db_handle, 0);
	}

/* Resolve given alias name */

	if (file_length)
	{
		memcpy(file_name_buffer, file_name, file_length);
		file_name_buffer[file_length] = '\0';
	}
	else
	{
		strcpy(file_name_buffer, file_name);
	}
	strcpy(alias_buffer, file_name_buffer);
	bool is_alias = ResolveDatabaseAlias(alias_buffer, file_name_buffer);
	file_name = file_name_buffer;
	file_length = strlen(file_name);
	if (is_alias)
	{
		ISC_expand_filename(file_name_buffer, sizeof(file_name_buffer), temp_buffer);
		expanded_filename = temp_buffer;
	}

/* Get length of database file name, if not already known */

	SSHORT fl = file_length;
	SSHORT length_expanded = strlen(expanded_filename);

	struct tdbb* tdbb = set_thread_data(thd_context);
	if (!verify_database_name(file_name, user_status)) {
		return user_status[1];
	}

/* Unless we're already attached, do some initialization */

	dbb = init(tdbb, user_status, expanded_filename, TRUE);
	if (!dbb) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
		JRD_SS_MUTEX_UNLOCK;
		JRD_restore_context();
		return user_status[1];
	}

	dbb->dbb_flags |= DBB_being_opened;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
	tdbb->tdbb_database = dbb;

/* Initialize special error handling */

	tdbb->tdbb_status_vector = status = user_status;
	tdbb->tdbb_attachment = attachment = NULL;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;

/* Count active thread in database */

	++dbb->dbb_use_count;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	BOOLEAN initing_security = FALSE;
#endif

/* The following line seems to fix a bug that appears on
   SCO EVEREST.  It probably has to do with the fact that
   the error handler below used to contain the first reference to
   variable transaction, which is actually initialized a few lines
   below that. */

	attachment = *(&attachment);

	try {

/* Allocate buffer space */

	TEXT*	opt_ptr = opt_buffer;
	TEXT	archive_name[MAXPATHLEN];
	TEXT	journal_name[MAXPATHLEN];
	TEXT	journal_dir[MAXPATHLEN];
	UCHAR	data[MAXPATHLEN];

/* Process database parameter block */

	get_options(dpb, dpb_length, &opt_ptr, DPB_EXPAND_BUFFER, &options);

#ifndef NO_NFS
/* Don't check nfs if single user */

	if (!options.dpb_single_user)
#endif
	{
		/* Check to see if the database is truly local or if it just looks
		   that way */
      
		if (ISC_check_if_remote(expanded_filename, TRUE)) {
			ERR_post(gds_unavailable, 0);
		}
	}

/* Worry about encryption key */

	if (dbb->dbb_decrypt) {
		if (dbb->dbb_filename && (dbb->dbb_encrypt_key || options.dpb_key)) {
			if ((dbb->dbb_encrypt_key && !options.dpb_key) ||
				(!dbb->dbb_encrypt_key && options.dpb_key) ||
				strcmp(options.dpb_key, reinterpret_cast<char*>(dbb->dbb_encrypt_key->str_data)))
				ERR_post(gds_no_priv,
						 gds_arg_string, "encryption",
						 gds_arg_string, "database",
						 gds_arg_string, 
                         ERR_string(file_name, fl), 
                         0);
		}
		else if (options.dpb_key)
			dbb->dbb_encrypt_key =
				copy_string(options.dpb_key, strlen(options.dpb_key));
	}

	tdbb->tdbb_attachment = attachment = FB_NEW(*dbb->dbb_permanent) att();
	attachment->att_database = dbb;
	attachment->att_filename = (is_alias) ?
		copy_string(alias_buffer, strlen(alias_buffer)) :
		copy_string(file_name_buffer, strlen(file_name_buffer));

	attachment->att_next = dbb->dbb_attachments;
	dbb->dbb_attachments = attachment;
	dbb->dbb_flags &= ~DBB_being_opened;
	dbb->dbb_sys_trans->tra_attachment = attachment;
	tdbb->tdbb_quantum = (THPS_BOOSTDONE() ? 
						  Config::getPriorityBoost() : 1) * QUANTUM;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;
	tdbb->tdbb_inhibit = 0;
	tdbb->tdbb_flags = 0;

	attachment->att_charset = options.dpb_interp;

	if (options.dpb_lc_messages) {
		attachment->att_lc_messages =
			copy_string(options.dpb_lc_messages,
						(USHORT) strlen(options.dpb_lc_messages));
	}

	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) {
		attachment->att_working_directory =
			copy_string(options.dpb_working_directory,
						(USHORT) strlen(options.dpb_working_directory));
	}

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

	first = FALSE;

	LCK_init(tdbb, LCK_OWNER_attachment);	/* For the attachment */
	attachment->att_flags |= ATT_lck_init_done;
	if (!dbb->dbb_filename)
	{
		first = TRUE;
		dbb->dbb_filename = copy_string(expanded_filename, length_expanded);
		/* Extra LCK_init() done to keep the lock table until the
		   database is shutdown() after the last detach. */
		LCK_init(tdbb, LCK_OWNER_database);
		dbb->dbb_flags |= DBB_lck_init_done;
		INI_init();
		FUN_init();
		SBM_init();
		dbb->dbb_file =
			PIO_open(dbb, expanded_filename, length_expanded,
					 options.dpb_trace, 0, file_name, fl);
		SHUT_init(dbb);
		PAG_header(file_name, fl);
		INI_init2();
		PAG_init();
		if (options.dpb_set_page_buffers) {
			dbb->dbb_page_buffers = options.dpb_page_buffers;
		}
		CCH_init(tdbb, (ULONG) options.dpb_buffers);
		PAG_init2(0);
		if (options.dpb_disable_wal) {
			/* Forcibly disable WAL before the next step.
			   We have an exclusive access to the database. */
			AIL_drop_log_force();
			options.dpb_disable_wal = FALSE;	/* To avoid further processing below */
		}

		SBM sbm_recovery = NULL;

		AIL_init(expanded_filename,
				length_expanded,
				0,
				options.dpb_activate_shadow,
				&sbm_recovery);

		AIL_set_log_options(options.dpb_wal_chkpt_len,
							options.dpb_wal_num_bufs,
							options.dpb_wal_bufsize,
							options.dpb_wal_grp_cmt_wait);

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_init(expanded_filename, length_expanded);
#endif

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

		SDW_init(options.dpb_activate_shadow,
				options.dpb_delete_shadow,
				sbm_recovery);

		/* dimitr: disabled due to unreliable behaviour of minor ODS upgrades
			a) in the case of any failure it's impossible to attach the database
			b) there's no way to handle failures properly, because upgrade is
			   being made in the context of system transaction which doesn't use
			   the backout logic
		INI_update_database();
		*/
	}

    /* 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(gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
				 gds_arg_string, 
                 ERR_string(file_name, fl), 
                 0);
	}

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

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

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
	initing_security = TRUE;
#endif

	if (invalid_client_SQL_dialect)
	{
		ERR_post(isc_inv_client_dialect_specified, isc_arg_number,
				 options.dpb_sql_dialect,
				 isc_arg_gds, isc_valid_client_dialects,
				 isc_arg_string, "1, or 3", 0);
	}
	invalid_client_SQL_dialect = FALSE;

	if (options.dpb_role_name)
	{
		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 (ENCODE_ODS(dbb->dbb_ods_version, dbb->dbb_minor_original)
					>= ODS_10_0)
					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;
				else
					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;
		}

		switch (options.dpb_sql_dialect)
		{
		case SQL_DIALECT_V5:
			{
				strip_quotes(options.dpb_role_name, local_role_name);
				len = strlen(local_role_name);
				p1 = reinterpret_cast<UCHAR*>(options.dpb_role_name);
				for (cnt = 0; cnt < len; cnt++) {
					*p1++ = UPPER7(local_role_name[cnt]);
				}
				*p1 = '\0';
			}
			break;
		case SQL_DIALECT_V6_TRANSITION:
		case SQL_DIALECT_V6:
			{
				if (*options.dpb_role_name == DBL_QUOTE ||
					*options.dpb_role_name == SINGLE_QUOTE)
				{
					p1 = reinterpret_cast<UCHAR*>(options.dpb_role_name);
					p2 = reinterpret_cast<UCHAR*>(local_role_name);
					cnt = 1;
					BOOLEAN	delimited_done = FALSE;
					TEXT	end_quote = *p1;
					p1++;
					/*
					   ** remove the delimited quotes and escape quote
					   ** from ROLE name
					 */
					while (*p1 && !delimited_done
						   && cnt < BUFFER_LENGTH128 - 1)
					{
						if (*p1 == end_quote)
						{
							cnt++;
							*p2++ = *p1++;
							if (*p1 && *p1 == end_quote
								&& cnt < BUFFER_LENGTH128 - 1)
							{
								p1++;	/* skip the escape quote here */
							}
							else
							{
								delimited_done = TRUE;
								p2--;
							}
						}
						else
						{
							cnt++;
							*p2++ = *p1++;
						}
					}
					*p2 = '\0';
					strcpy(options.dpb_role_name, local_role_name);
				}
				else
				{
					strcpy(local_role_name, options.dpb_role_name);
					len = strlen(local_role_name);
					p1 = reinterpret_cast < UCHAR * >(options.dpb_role_name);
					for (cnt = 0; cnt < len; cnt++)
					{
						*p1++ = UPPER7(local_role_name[cnt]);
					}
					*p1 = '\0';
				}
			}
			break;
		default:
			break;
		}
	}

	options.dpb_sql_dialect = 0;

	// Don't run internal handles thru the security gauntlet.

	BOOLEAN internal = FALSE;

	for (IHNDL ihandle = internal_db_handles;
		 ihandle;
		 ihandle = ihandle->ihndl_next)
	{
		if (ihandle->ihndl_object == (isc_db_handle *) handle)
		{
			internal = TRUE;
			break;
		}
	}

	SCL_init(	FALSE,
				options.dpb_sys_user_name,
				options.dpb_user_name,
				options.dpb_password,
				options.dpb_password_enc,
				options.dpb_role_name,
				tdbb,
				internal);

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	initing_security = FALSE;
	V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif

	if (options.dpb_shutdown || options.dpb_online)
	{
		/* By releasing the DBB_MUTX_init_fini mutex here, we would be allowing
		   other threads to proceed with their detachments, so that shutdown does
		   not timeout for exclusive access and other threads don't have to wait
		   behind shutdown */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		JRD_SS_MUTEX_UNLOCK;
		if (!SHUT_database
			(dbb, options.dpb_shutdown, options.dpb_shutdown_delay)) {
			JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
			if (user_status[1] != FB_SUCCESS)
				ERR_punt();
			else
				ERR_post(gds_no_priv,
						 gds_arg_string, "shutdown or online",
						 gds_arg_string, "database",
						 gds_arg_string, 
                         ERR_string(file_name, fl), 
                         0);
		}
		JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	}

#ifdef SUPERSERVER
/* 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) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		JRD_SS_MUTEX_UNLOCK;
		CCH_exclusive_attachment(tdbb, LCK_none, LCK_WAIT);
		JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		if (attachment->att_flags & ATT_shutdown)
			ERR_post(gds_shutdown, gds_arg_string, 
                     ERR_string(file_name, fl),
					 0);
	}
#endif

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

	if (dbb->dbb_ast_flags & (DBB_shut_attach | DBB_shut_tran))
	{
		ERR_post(gds_shutinprog, gds_arg_string, 
                 ERR_string(file_name, fl),
				 0);
	}

	if (dbb->dbb_ast_flags & DBB_shutdown &&
		!(attachment->att_user->usr_flags & (USR_locksmith | USR_owner)))
	{
		ERR_post(gds_shutdown, gds_arg_string, 
                 ERR_string(file_name, fl), 
                 0);
	}

	if (options.dpb_disable) {
		AIL_disable();
	}

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	if (options.dpb_quit_log) {
		LOG_disable();
	}
#endif

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

	find_intl_charset(tdbb, attachment, &options);

	if (options.dpb_verify)
	{
		if (!CCH_exclusive(tdbb, LCK_PW, WAIT_PERIOD)) {
			ERR_post(gds_bad_dpb_content, gds_arg_gds, gds_cant_validate, 0);
		}

#ifdef GARBAGE_THREAD
		/* Can't allow garbage collection during database validation. */

		VIO_fini(tdbb);
#endif
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		JRD_SS_MUTEX_UNLOCK;
		if (!VAL_validate(tdbb, options.dpb_verify)) {
			JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
			ERR_punt();
		}
		JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	}

	if (options.dpb_journal) {
		if (first)
		{
			archive_name[0] = 0;

			if (options.dpb_wal_backup_dir)
				ISC_expand_filename(options.dpb_wal_backup_dir, 0,
									archive_name);

			make_jrn_data(data, &d_len, expanded_filename, length_expanded,
						  archive_name, (USHORT) strlen(archive_name));

			ISC_expand_filename(options.dpb_journal, 0, journal_name);

			AIL_enable(journal_name, (USHORT) strlen(journal_name),
					   data, d_len, (SSHORT) strlen(archive_name));
		}
		else {
			ERR_post(gds_bad_dpb_content,
					 gds_arg_gds, gds_cant_start_journal,
					 0);
		}
	}

	if (options.dpb_wal_action)
	{
		/* Make sure WAL enabled before taking any WAL action. */

		if (!dbb->dbb_wal) {
			ERR_post(gds_no_wal, 0);
		}
		if (!CCH_exclusive(tdbb, LCK_EX, WAIT_PERIOD)) {
			ERR_post(gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
					 gds_arg_string, 
                     ERR_string(file_name, fl), 0);
		}

		/* journal has to be disabled before dropping WAL */

		if (PAG_get_clump(	HEADER_PAGE,
							HDR_journal_server,
							&jd_len,
							reinterpret_cast<UCHAR*>(journal_dir))) {
			AIL_disable();
		}
	}

/*
 * if the attachment is through gbak and this the 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)) &&
		!(attachment->att_user->usr_flags & (USR_locksmith | USR_owner))) {
		ERR_post(isc_adm_task_denied, 0);
	}

	if (options.dpb_online_dump) {
		CCH_release_exclusive(tdbb);

		OLD_dump(expanded_filename, length_expanded,
				 options.dpb_old_dump_id,
				 options.dpb_old_file_size,
				 options.dpb_old_start_page,
				 options.dpb_old_start_seqno,
				 options.dpb_old_start_file,
				 options.dpb_old_num_files, options.dpb_old_file);
	}

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	if (options.dpb_log) {
		if (first) {
			if (!CCH_exclusive(tdbb, LCK_EX, WAIT_PERIOD))
				ERR_post(gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
						 gds_arg_string, 
                         ERR_string(file_name, fl),
                         0);
			LOG_enable(options.dpb_log, strlen(options.dpb_log));
		}
		else {
			ERR_post(gds_bad_dpb_content, gds_arg_gds,
					 gds__cant_start_logging, 0);
		}
	}
#endif

	if (options.dpb_set_db_sql_dialect) {
		PAG_set_db_SQL_dialect(dbb, options.dpb_set_db_sql_dialect);
	}

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

	if (options.dpb_set_force_write) {
		PAG_set_force_write(dbb, options.dpb_force_write);
	}

	if (options.dpb_set_no_reserve) {
		PAG_set_no_reserve(dbb, options.dpb_no_reserve);
	}

	if (options.dpb_set_page_buffers) {
		PAG_set_page_buffers(options.dpb_page_buffers);
	}

	if (options.dpb_set_db_readonly) {
		if (!CCH_exclusive(tdbb, LCK_EX, WAIT_PERIOD)) {
			ERR_post(gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
					 gds_arg_string,
					 ERR_string(file_name, fl), 
					 0); 
		}
		PAG_set_db_readonly(dbb, options.dpb_db_readonly);
	}

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
/* don't record the attach until now in case the log is added during the attach */

	LOG_call(log_attach2, file_length, file_name, *handle, dpb_length, dpb,
			 expanded_filename);
#endif

#ifdef GARBAGE_THREAD
	VIO_init(tdbb);
#endif

	CCH_release_exclusive(tdbb);

#ifdef GOVERNOR
	if (!options.dpb_sec_attach) {
		if (JRD_max_users) {
			if (num_attached < (JRD_max_users * ATTACHMENTS_PER_USER)) {
				num_attached++;
			}
			else {
				ERR_post(isc_max_att_exceeded, 0);
			}
		}
	}
	else {
		attachment->att_flags |= ATT_security_db;
	}
#endif /* GOVERNOR */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
/* if there was an error, the status vector is all set */

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

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

	JRD_SS_MUTEX_UNLOCK;

	*handle = attachment;

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_handle_returned, *handle);
#endif

	return return_success(tdbb);

	}	// try
	catch (const std::exception&)
	{
		try
		{
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			if (initing_security)
			{
				V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
			}
#endif
			tdbb->tdbb_status_vector = temp_status;
			dbb->dbb_flags &= ~DBB_being_opened;
			release_attachment(attachment);

			/* At this point, mutex dbb->dbb_mutexes [DBB_MUTX_init_fini] has been
			   unlocked and mutex databases_mutex has been locked. */
			if (MemoryPool::blk_type(dbb) == type_dbb)
			{
				if (!dbb->dbb_attachments)
				{
					shutdown_database(dbb, TRUE);
				}
				else if (attachment)
				{
					delete attachment;
				}
			}
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
		}	// try
		catch (const std::exception&) {}
		tdbb->tdbb_status_vector = status;
		JRD_SS_MUTEX_UNLOCK;
		return error(user_status);
	}
}


STATUS DLL_EXPORT GDS_BLOB_INFO(STATUS*	user_status,
								BLB*	blob_handle,
								SSHORT	item_length,
								SCHAR*	items,
								SSHORT	buffer_length,
								SCHAR*	buffer)
{
/**************************************
 *
 *	g d s _ $ b l o b _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on blob object.
 *
 **************************************/
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	BLB blob = check_blob(tdbb, user_status, blob_handle);
	if (!blob) {
		return user_status[1];
	}

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_blob_info2, *blob_handle, item_length, items, buffer_length);
#endif

	try {
		tdbb->tdbb_status_vector = user_status;

		INF_blob_info(blob, items, item_length, buffer, buffer_length);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_CANCEL_BLOB(STATUS * user_status, BLB * blob_handle)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	BLB blob;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (*blob_handle) {
		if (!(blob = check_blob(tdbb, user_status, blob_handle)))
			return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_cancel_blob, *blob_handle);
#endif

		try {
			tdbb->tdbb_status_vector = user_status;

			BLB_cancel(tdbb, blob);
			*blob_handle = NULL;
		}
		catch (const std::exception&)
		{
			return error(user_status);
		}
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_CANCEL_EVENTS(STATUS*	user_status,
									ATT*	handle,
									SLONG*	id)
{
/**************************************
 *
 *	g d s _ $ c a n c e l _ e v e n t s
 *
 **************************************
 *
 * Functional description
 *	Cancel an outstanding event.
 *
 **************************************/
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (check_database(tdbb, *handle, user_status)) {
		return user_status[1];
	}

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_cancel_events, *handle, *id);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		EVENT_cancel(*id);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


#ifdef CANCEL_OPERATION
STATUS DLL_EXPORT GDS_CANCEL_OPERATION(STATUS * user_status,
									   ATT * handle, USHORT 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.
 *
 **************************************/
	DBB dbb;
	ATT attachment, attach;

	api_entry_point_init(user_status);

	attachment = *handle;

/* Check out the database handle.  This is mostly code from
   the routine "check_database" */

	if (!attachment ||
		(MemoryPool::blk_type(attachment) != type_att) ||
		!(dbb = attachment->att_database) ||
		MemoryPool::blk_type(dbb) != type_dbb)
		return handle_error(user_status, gds_bad_db_handle, 0);

/* Make sure this is a valid attachment */

	for (attach = dbb->dbb_attachments; attach; attach = attach->att_next)
		if (attach == attachment)
			break;

	if (!attach)
		return handle_error(user_status, gds_bad_db_handle, 0);

	switch (option) {
	case CANCEL_disable:
		attachment->att_flags |= ATT_cancel_disable;
		break;

	case CANCEL_enable:
		attachment->att_flags &= ~ATT_cancel_disable;
		break;

	case CANCEL_raise:
		attachment->att_flags |= ATT_cancel_raise;
		break;

	default:
		assert(FALSE);
	}

	return FB_SUCCESS;
}
#endif


STATUS DLL_EXPORT GDS_CLOSE_BLOB(STATUS * user_status, BLB * blob_handle)
{
/**************************************
 *
 *	g d s _ $ c l o s e _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	BLB blob;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (!(blob = check_blob(tdbb, user_status, blob_handle)))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_close_blob, *blob_handle);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		BLB_close(tdbb, blob);
		*blob_handle = NULL;
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}


	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_COMMIT(STATUS * user_status, JRD_TRA * tra_handle)
{
/**************************************
 *
 *	g d s _ $ c o m m i t
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/

	api_entry_point_init(user_status);

	if (commit(user_status, tra_handle, FALSE))
		return user_status[1];

	*tra_handle = NULL;

	return FB_SUCCESS;
}


STATUS DLL_EXPORT GDS_COMMIT_RETAINING(STATUS * user_status, JRD_TRA * tra_handle)
{
/**************************************
 *
 *	g d s _ $ c o m m i t _ r e t a i n i n g
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/

	api_entry_point_init(user_status);

	return commit(user_status, tra_handle, TRUE);
}


STATUS DLL_EXPORT GDS_COMPILE(STATUS * user_status,
							  ATT * db_handle,
							  JRD_REQ * req_handle,
							  SSHORT blr_length, SCHAR * blr)
{
/**************************************
 *
 *	g d s _ $ c o m p i l e
 *
 **************************************
 *
 * Functional description
 *
 **************************************/
	JRD_REQ request;
	ATT attachment;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	NULL_CHECK(req_handle, gds_bad_req_handle);
	attachment = *db_handle;

	if (check_database(tdbb, attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_compile, *db_handle, *req_handle, blr_length, blr);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		request = CMP_compile2(tdbb, reinterpret_cast < UCHAR * >(blr), FALSE);
		request->req_attachment = attachment;
		request->req_request = attachment->att_requests;
		attachment->att_requests = request;
	
		DEBUG;
		*req_handle = request;
	#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_handle_returned, *req_handle);
	#endif
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_CREATE_BLOB2(STATUS * user_status,
								   ATT * db_handle,
								   JRD_TRA * tra_handle,
								   BLB * blob_handle,
								   BID blob_id,
								   USHORT bpb_length, UCHAR * bpb)
{
/**************************************
 *
 *	g d s _ $ c r e a t e _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Open an existing blob.
 *
 **************************************/
	JRD_TRA transaction;
	BLB blob;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	NULL_CHECK(blob_handle, gds_bad_segstr_handle);

	if (check_database(tdbb, *db_handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_create_blob2, *db_handle, *tra_handle, *blob_handle, blob_id,
			 bpb_length, bpb);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		transaction = find_transaction(tdbb, *tra_handle, gds_segstr_wrong_db);
		blob = BLB_create2(tdbb, transaction, blob_id, bpb_length, bpb);
		*blob_handle = blob;
	
	#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_handle_returned, *blob_handle);
		LOG_call(log_handle_returned, blob_id->bid_stuff.bid_blob);
	#endif
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}


	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_CREATE_DATABASE(STATUS*	user_status,
									  USHORT	file_length,
									  TEXT*		file_name,
									  ATT*		handle,
									  USHORT	dpb_length,
									  UCHAR*	dpb,
									  USHORT	db_type,
									  TEXT*		expanded_filename)
{
/**************************************
 *
 *	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.
 *
 **************************************/
	DBB dbb;
	TEXT expanded_name[MAXPATHLEN];
	TEXT opt_buffer[DPB_EXPAND_BUFFER];
	TEXT *opt_ptr;
	USHORT length, page_size;
	ATT attachment;
	STATUS temp_status[ISC_STATUS_LENGTH], *status;
	DPB options;
	struct tdbb thd_context;
	FIL first_dbb_file;

	api_entry_point_init(user_status);

	if (*handle)
		return handle_error(user_status, gds_bad_db_handle, 0);

/* Get length of database file name, if not already known */

	length =
		file_length ? file_length : strlen(file_name);
	MOVE_FAST(file_name, expanded_name, length);
	expanded_name[length] = 0;

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (!(dbb = init(tdbb, user_status, expanded_name, FALSE))) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
		JRD_SS_MUTEX_UNLOCK;
		JRD_restore_context();
		return user_status[1];
	}

	dbb->dbb_flags |= DBB_being_opened;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
	tdbb->tdbb_database = dbb;

/* Initialize error handling */

	tdbb->tdbb_status_vector = status = user_status;
	tdbb->tdbb_attachment = attachment = NULL;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;

/* Count active thread in database */

	++dbb->dbb_use_count;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	BOOLEAN initing_security = FALSE;
#endif

	try {

/* Process database parameter block */

	opt_ptr = opt_buffer;

	get_options(dpb, dpb_length, &opt_ptr, DPB_EXPAND_BUFFER, &options);
	if (invalid_client_SQL_dialect == FALSE && options.dpb_sql_dialect == 99)
		options.dpb_sql_dialect = 0;


#ifndef NO_NFS
/* Don't check nfs if single user */

	if (!options.dpb_single_user)
#endif
	{
		/* Check to see if the database is truly local or if it just looks
		   that way */

		if (ISC_check_if_remote(expanded_filename, TRUE)) {
			ERR_post(gds_unavailable, 0);
		}
	}

	if (options.dpb_key)
		dbb->dbb_encrypt_key =
			copy_string(options.dpb_key, strlen(options.dpb_key));

	tdbb->tdbb_attachment = attachment = FB_NEW(*dbb->dbb_permanent) att();
	attachment->att_database = dbb;
	attachment->att_filename = copy_string(expanded_name, strlen(expanded_name));
	attachment->att_next = dbb->dbb_attachments;
	dbb->dbb_attachments = attachment;
	dbb->dbb_flags &= ~DBB_being_opened;
	dbb->dbb_sys_trans->tra_attachment = attachment;
	tdbb->tdbb_quantum = QUANTUM;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;
	tdbb->tdbb_inhibit = 0;
	tdbb->tdbb_flags = 0;

	if (options.dpb_working_directory)
		attachment->att_working_directory =
			copy_string(options.dpb_working_directory,
						(USHORT) strlen(options.dpb_working_directory));

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

	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(isc_database_create_failed, isc_arg_string,
				 expanded_filename, isc_arg_gds, isc_inv_dialect_specified,
				 isc_arg_number, options.dpb_sql_dialect, isc_arg_gds,
				 isc_valid_db_dialects, isc_arg_string, "1 and 3", 0);
		break;
	}

	attachment->att_charset = options.dpb_interp;
	if (options.dpb_lc_messages)
		attachment->att_lc_messages =
			copy_string(options.dpb_lc_messages,
						(USHORT) strlen(options.dpb_lc_messages));

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

	for (page_size = MIN_PAGE_SIZE; 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;

	LCK_init(tdbb, LCK_OWNER_attachment);	/* For the attachment */
	attachment->att_flags |= ATT_lck_init_done;
/* Extra LCK_init() done to keep the lock table until the
   database is shutdown() after the last detach. */
	LCK_init(tdbb, LCK_OWNER_database);
	dbb->dbb_flags |= DBB_lck_init_done;
	INI_init();
	FUN_init();
	PAG_init();
	SBM_init();
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
	initing_security = TRUE;
#endif

	// Don't run internal handles thru the security gauntlet.

	BOOLEAN internal = FALSE;

	for (IHNDL ihandle = internal_db_handles;
		 ihandle;
		 ihandle = ihandle->ihndl_next)
	{
		if (ihandle->ihndl_object == (isc_db_handle *) handle)
		{
			internal = TRUE;
			break;
		}
	}

	SCL_init(	TRUE,
				options.dpb_sys_user_name,
				options.dpb_user_name,
				options.dpb_password,
				options.dpb_password_enc,
				options.dpb_role_name,
				tdbb,
				internal);

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	initing_security = FALSE;
	V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	length =
		PIO_expand(file_name, length,
				   expanded_name);
	if (!verify_database_name(file_name, user_status)) {
		return user_status[1];
	}
	dbb->dbb_file =
		PIO_create(dbb, expanded_name, length, options.dpb_overwrite);
	first_dbb_file = dbb->dbb_file;
	if (options.dpb_set_page_buffers)
		dbb->dbb_page_buffers = options.dpb_page_buffers;
	CCH_init(tdbb, (ULONG) options.dpb_buffers);
	PAG_format_header();
	INI_init2();
	PAG_format_log();
	PAG_format_pip();

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

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

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

	if (options.dpb_shutdown || options.dpb_online) {
		/* By releasing the DBB_MUTX_init_fini mutex here, we would be allowing
		   other threads to proceed with their detachments, so that shutdown does
		   not timeout for exclusive access and other threads don't have to wait
		   behind shutdown */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		if (!SHUT_database
			(dbb, options.dpb_shutdown, options.dpb_shutdown_delay)) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
			ERR_post(gds_no_priv,
					 gds_arg_string, "shutdown or online",
					 gds_arg_string, "database",
					 gds_arg_string,
					 ERR_string(file_name, length), 0);
		}
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	}

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

	if (options.dpb_set_force_write)
		PAG_set_force_write(dbb, 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(options.dpb_activate_shadow, options.dpb_delete_shadow, 0);

	AIL_set_log_options(options.dpb_wal_chkpt_len,
						options.dpb_wal_num_bufs,
						options.dpb_wal_bufsize,
						options.dpb_wal_grp_cmt_wait);

#ifdef GARBAGE_THREAD
	VIO_init(tdbb);
#endif

    if (options.dpb_set_db_readonly) {
        if (!CCH_exclusive (tdbb, LCK_EX, WAIT_PERIOD))
            ERR_post (gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
                      gds_arg_string, 
                      ERR_string (file_name, length), 
                      0);
        
        PAG_set_db_readonly (dbb, options.dpb_db_readonly);
    }

    CCH_release_exclusive(tdbb);

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

	find_intl_charset(tdbb, attachment, &options);

#ifdef WIN_NT
	dbb->dbb_filename = copy_string(first_dbb_file->fil_string,
									first_dbb_file->fil_length);
#else
	dbb->dbb_filename = copy_string(expanded_name, length);
#endif

#ifdef GOVERNOR
	if (!options.dpb_sec_attach) {
		if (JRD_max_users) {
			if (num_attached < (JRD_max_users * ATTACHMENTS_PER_USER))
				num_attached++;
			else
				ERR_post(isc_max_att_exceeded, 0);
		}
	}
	else {
		attachment->att_flags |= ATT_security_db;
	}
#endif /* GOVERNOR */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	JRD_SS_MUTEX_UNLOCK;

	*handle = attachment;
	CCH_flush(tdbb, (USHORT) FLUSH_FINI, 0);

	return return_success(tdbb);

	}	// try
	catch (const std::exception&)
	{
		try
		{
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			if (initing_security)
			{
				V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
			}
#endif
			tdbb->tdbb_status_vector = temp_status;
			dbb->dbb_flags &= ~DBB_being_opened;
			release_attachment(attachment);

			/* At this point, mutex dbb->dbb_mutexes [DBB_MUTX_init_fini] has been
			   unlocked and mutex databases_mutex has been locked. */
			if (MemoryPool::blk_type(dbb) == type_dbb)
			{
				if (!dbb->dbb_attachments)
				{
					shutdown_database(dbb, TRUE);
				}
				else if (attachment)
				{
					delete attachment;
				}
			}
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
			V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
		}
		catch (const std::exception&) {}
		tdbb->tdbb_status_vector = status;
		JRD_SS_MUTEX_UNLOCK;
		return error(user_status);
	}
}


STATUS DLL_EXPORT GDS_DATABASE_INFO(STATUS * user_status,
									ATT * handle,
									SSHORT item_length,
									SCHAR * items,
									SSHORT buffer_length, SCHAR * buffer)
{
/**************************************
 *
 *	g d s _ $ d a t a b a s e _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on database object.
 *
 **************************************/
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (check_database(tdbb, *handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_database_info2, *handle, item_length, items, buffer_length);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		INF_database_info(items, item_length, buffer, buffer_length);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_DDL(STATUS * user_status,
						  ATT * db_handle,
						  JRD_TRA * tra_handle, USHORT ddl_length, SCHAR * ddl)
{
/**************************************
 *
 *	g d s _ $ d d l
 *
 **************************************
 *
 * Functional description
 *
 **************************************/
	ATT attachment;
	JRD_TRA transaction;
	struct tdbb thd_context;
	STATUS temp_status[ISC_STATUS_LENGTH];

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	attachment = *db_handle;
	if (check_database(tdbb, attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_ddl, *db_handle, *tra_handle, ddl_length, ddl);
#endif

	tdbb->tdbb_status_vector = user_status;

	try {

		transaction = find_transaction(tdbb, *tra_handle, gds_segstr_wrong_db);

		DYN_ddl(attachment, transaction, ddl_length,
				reinterpret_cast<UCHAR*>(ddl));

	}	// try
	catch (const std::exception&) {
		if (tdbb->tdbb_status_vector == temp_status) {
			tdbb->tdbb_status_vector = user_status;
		}
		return error(user_status);
	}

/*
 * 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.

 * For now only ExpressLink will use this feature.  Later
 * a new entry point may be added.
 */

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

		try {
			TRA_commit(tdbb, transaction, TRUE);
		}
		catch (const std::exception&)  {
			tdbb->tdbb_status_vector = temp_status;
			TRA_rollback(tdbb, transaction, TRUE);
			tdbb->tdbb_status_vector = user_status;

			return error(user_status);
		}
	};

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_DETACH(STATUS * user_status, ATT * handle)
{
/**************************************
 *
 *	g d s _ $ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a database.
 *
 **************************************/
	DBB dbb;
	ATT attachment, attach;
	struct tdbb thd_context;
#ifdef GOVERNOR
	USHORT attachment_flags;
#endif

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	attachment = *handle;

/* Check out the database handle.  This is mostly code from
   the routine "check_database" */

	if (!attachment ||
		(MemoryPool::blk_type(attachment) != type_att) ||
		!(dbb = attachment->att_database) ||
		MemoryPool::blk_type(dbb) != type_dbb)
		return handle_error(user_status, gds_bad_db_handle, tdbb);

/* Make sure this is a valid attachment */

	for (attach = dbb->dbb_attachments; attach; attach = attach->att_next)
		if (attach == attachment)
			break;

	if (!attach)
		return handle_error(user_status, gds_bad_db_handle, tdbb);

/* if this is the last attachment, mark dbb as not in use */

	JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(databases_mutex);
#endif
	if (dbb->dbb_attachments == attachment && !attachment->att_next &&
		!(dbb->dbb_flags & DBB_being_opened))
		dbb->dbb_flags |= DBB_not_in_use;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif

	tdbb->tdbb_database = dbb;
	tdbb->tdbb_attachment = attachment;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;
	tdbb->tdbb_default = NULL;

/* Count active thread in database */

	++dbb->dbb_use_count;

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_detach, *handle);
	LOG_call(log_statistics, dbb->dbb_reads, dbb->dbb_writes,
			 dbb->dbb_max_memory);
#endif

/* purge_attachment below can do an ERR_post */

	tdbb->tdbb_status_vector = user_status;

	try {

/* Purge attachment, don't rollback open transactions */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif

#ifdef CANCEL_OPERATION
	attachment->att_flags |= ATT_cancel_disable;
#endif

#ifdef GOVERNOR
	attachment_flags = (USHORT) attachment->att_flags;
#endif

	purge_attachment(tdbb, user_status, attachment, FALSE);

#ifdef GOVERNOR
	if (JRD_max_users) {
		if (!(attachment_flags & ATT_security_db)) {
			assert(num_attached > 0);
			num_attached--;
		}
	}
#endif /* GOVERNOR */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
	JRD_SS_MUTEX_UNLOCK;

	*handle = NULL;

	return return_success(tdbb);

	}	// try
	catch (const std::exception&) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(databases_mutex);
#endif
		dbb->dbb_flags &= ~DBB_not_in_use;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif

		JRD_SS_MUTEX_UNLOCK;
		return error(user_status);
	}
}


STATUS DLL_EXPORT GDS_DROP_DATABASE(STATUS * user_status, ATT * handle)
{
/**************************************
 *
 *	i s c _ d r o p _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Close down and purge a database.
 *
 **************************************/
	DBB dbb;
	ATT attachment, attach;
	FIL file;
	WIN window;
	HDR header;
	SDW shadow;
	BOOLEAN err;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	attachment = *handle;

/* Check out the database handle.  This is mostly code from
   the routine "check_database" */

	if (!attachment ||
		(MemoryPool::blk_type(attachment) != type_att) ||
		!(dbb = attachment->att_database) ||
		MemoryPool::blk_type(dbb) != type_dbb)
		return handle_error(user_status, gds_bad_db_handle, tdbb);

/* Make sure this is a valid attachment */

	for (attach = dbb->dbb_attachments; attach; attach = attach->att_next)
		if (attach == attachment)
			break;

	if (!attach)
		return handle_error(user_status, gds_bad_db_handle, tdbb);

	tdbb->tdbb_database = dbb;
	tdbb->tdbb_attachment = attachment;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;
	tdbb->tdbb_default = dbb->dbb_permanent;

/* Count active thread in database */

	++dbb->dbb_use_count;

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_drop_database, *handle);
	LOG_call(log_statistics, dbb->dbb_reads, dbb->dbb_writes,
			 dbb->dbb_max_memory);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		if (!(attachment->att_user->usr_flags & (USR_locksmith | USR_owner)))
			ERR_post(gds_no_priv,
					gds_arg_string, "drop",
					gds_arg_string, "database",
					gds_arg_string,
					ERR_cstring((SCHAR*) tdbb->tdbb_attachment->att_filename->str_data), 0);

		if (attachment->att_flags & ATT_shutdown)
			ERR_post(gds_shutdown, gds_arg_string,
					ERR_cstring((SCHAR*) tdbb->tdbb_attachment->att_filename->str_data), 0);

		if (!CCH_exclusive(tdbb, LCK_PW, WAIT_PERIOD))
			ERR_post(gds_lock_timeout, gds_arg_gds, gds_obj_in_use,
					gds_arg_string,
					ERR_cstring((SCHAR*) tdbb->tdbb_attachment->att_filename->str_data), 0);

		JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_LOCK(databases_mutex);
		V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
	}
	catch(const std::exception&)
	{
		return error(user_status);
	}
	
	try {

/* Check if same process has more attachments */

	if ((attach = dbb->dbb_attachments) && (attach->att_next)) {
		ERR_post(gds_no_meta_update, gds_arg_gds, gds_obj_in_use,
				 gds_arg_string, "DATABASE", 0);
	}

#ifdef CANCEL_OPERATION
	attachment->att_flags |= ATT_cancel_disable;
#endif

/* 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. */

	window.win_page = HEADER_PAGE;
	window.win_flags = 0;
	header = (HDR) CCH_FETCH(tdbb, &window, LCK_write, pag_header);
	CCH_MARK_MUST_WRITE(tdbb, &window);
	header->hdr_ods_version = 0;
	CCH_RELEASE(tdbb, &window);

	}	// try
	catch (const std::exception&) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(databases_mutex);
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
		JRD_SS_MUTEX_UNLOCK;
		return error(user_status);
	}

/* A default catch all */
	try {

/* This point on database is useless */

/* mark the dbb unusable */

	dbb->dbb_flags |= DBB_not_in_use;
	*handle = NULL;

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
	file = dbb->dbb_file;
	shadow = dbb->dbb_shadow;

	AIL_drop_log();

	tdbb->tdbb_default = NULL;

#ifdef GOVERNOR
	if (JRD_max_users) {
		assert(num_attached > 0);
		num_attached--;
	}
#endif /* GOVERNOR */

/* Unlink attachment from database */

	release_attachment(attachment);

/* At this point, mutex dbb->dbb_mutexes [DBB_MUTX_init_fini] has been
   unlocked and mutex databases_mutex has been locked. */

	shutdown_database(dbb, FALSE);

/* drop the files here. */

	err = drop_files(file);
	for (; shadow; shadow = shadow->sdw_next) {
		err |= drop_files(shadow->sdw_file);
	}

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
	}	// try
	catch (const std::exception&) {
		JRD_SS_MUTEX_UNLOCK;
		return error(user_status);
	}
	JRD_SS_MUTEX_UNLOCK;

	dbb::deleteDbb(dbb);
	tdbb->tdbb_database = NULL;
	if (err) {
		user_status[0] = gds_arg_gds;
		user_status[1] = gds_drdb_completed_with_errs;
		user_status[2] = gds_arg_end;
		return user_status[1];
	}

	return return_success(tdbb);

}


STATUS DLL_EXPORT GDS_GET_SEGMENT(STATUS * user_status,
								  BLB * blob_handle,
								  USHORT * length,
								  USHORT buffer_length, UCHAR * buffer)
{
/**************************************
 *
 *	g d s _ $ g e t _ s e g m e n t
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	BLB blob;
	DBB dbb;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (!(blob = check_blob(tdbb, user_status, blob_handle)))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_get_segment2, *blob_handle, length, buffer_length);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		*length = BLB_get_segment(tdbb, blob, buffer, buffer_length);
		tdbb->tdbb_status_vector[0] = gds_arg_gds;
		tdbb->tdbb_status_vector[2] = gds_arg_end;
		dbb = tdbb->tdbb_database;
	
		if (blob->blb_flags & BLB_eof) {
			JRD_restore_context();
			--dbb->dbb_use_count;
			return (user_status[1] = gds_segstr_eof);
		}
		else if (blob->blb_fragment_size) {
			JRD_restore_context();
			--dbb->dbb_use_count;
			return (user_status[1] = gds_segment);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_GET_SLICE(STATUS * user_status,
								ATT * db_handle,
								JRD_TRA * tra_handle,
								SLONG * array_id,
								USHORT sdl_length,
								UCHAR * sdl,
								USHORT param_length,
								UCHAR * param,
								SLONG slice_length,
								UCHAR * slice, SLONG * return_length)
{
/**************************************
 *
 *	g d s _ $ g e t _ s l i c e
 *
 **************************************
 *
 * Functional description
 *	Snatch a slice of an array.
 *
 **************************************/
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (check_database(tdbb, *db_handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_get_slice2, *db_handle, *tra_handle, *array_id, sdl_length,
			 sdl, param_length, param, slice_length);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		transaction = find_transaction(tdbb, *tra_handle, gds_segstr_wrong_db);
	
		if (!array_id[0] && !array_id[1]) {
			MOVE_CLEAR(slice, slice_length);
			*return_length = 0;
		}
		else
			*return_length = BLB_get_slice(tdbb,
									   transaction,
									   reinterpret_cast < BID > (array_id),
									   sdl,
									   param_length,
									   reinterpret_cast < long *>(param),
									   slice_length, slice);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_OPEN_BLOB2(STATUS * user_status,
								 ATT * db_handle,
								 JRD_TRA * tra_handle,
								 BLB * blob_handle,
								 BID blob_id, USHORT bpb_length, UCHAR * bpb)
{
/**************************************
 *
 *	g d s _ $ o p e n _ b l o b 2
 *
 **************************************
 *
 * Functional description
 *	Open an existing blob.
 *
 **************************************/
	BLB blob;
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	NULL_CHECK(blob_handle, gds_bad_segstr_handle);

	if (check_database(tdbb, *db_handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_open_blob2, *db_handle, *tra_handle, *blob_handle, blob_id,
			 bpb_length, bpb);
#endif

	try
	{
		tdbb->tdbb_status_vector = user_status;

		transaction = find_transaction(tdbb, *tra_handle, gds_segstr_wrong_db);
		blob = BLB_open2(tdbb, transaction, blob_id, bpb_length, bpb);
		*blob_handle = blob;
	
	#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_handle_returned, *blob_handle);
	#endif
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_PREPARE(STATUS * user_status,
							  JRD_TRA * tra_handle, USHORT length, UCHAR * 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.
 *
 **************************************/
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*tra_handle), type_tra, gds_bad_trans_handle);
	transaction = *tra_handle;

	if (check_database(tdbb, transaction->tra_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_prepare2, *tra_handle, length, msg);
#endif

	if (prepare(tdbb, transaction, user_status, length, msg))
		return error(user_status);

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_PUT_SEGMENT(STATUS * user_status,
								  BLB * blob_handle,
								  USHORT buffer_length, UCHAR * buffer)
{
/**************************************
 *
 *	g d s _ $ p u t _ s e g m e n t
 *
 **************************************
 *
 * Functional description
 *	Abort a partially completed blob.
 *
 **************************************/
	BLB blob;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (!(blob = check_blob(tdbb, user_status, blob_handle)))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_put_segment, *blob_handle, buffer_length, buffer);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		BLB_put_segment(tdbb, blob, buffer, buffer_length);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_PUT_SLICE(STATUS * user_status,
								ATT * db_handle,
								JRD_TRA * tra_handle,
								SLONG * array_id,
								USHORT sdl_length,
								UCHAR * sdl,
								USHORT param_length,
								UCHAR * param,
								SLONG slice_length, UCHAR * slice)
{
/**************************************
 *
 *	g d s _ $ p u t _ s l i c e
 *
 **************************************
 *
 * Functional description
 *	Snatch a slice of an array.
 *
 **************************************/

	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (check_database(tdbb, *db_handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_put_slice, *db_handle, *tra_handle, *array_id, sdl_length,
			 sdl, param_length, param, slice_length, slice);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		transaction = find_transaction(tdbb, *tra_handle, gds_segstr_wrong_db);
		BLB_put_slice(tdbb,
				  transaction,
				  reinterpret_cast < BID > (array_id),
				  sdl,
				  param_length,
				  reinterpret_cast < long *>(param), slice_length, slice);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_QUE_EVENTS(STATUS * user_status,
								 ATT * handle,
								 SLONG * id,
								 SSHORT length,
								 UCHAR * items, FPTR_VOID ast, void *arg)
{
/**************************************
 *
 *	g d s _ $ q u e _ e v e n t s
 *
 **************************************
 *
 * Functional description
 *	Que a request for event notification.
 *
 **************************************/
	DBB dbb;
	ATT attachment;
	LCK lock;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (check_database(tdbb, *handle, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_que_events, *handle, length, items);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		dbb = tdbb->tdbb_database;
		lock = dbb->dbb_lock;
		attachment = tdbb->tdbb_attachment;
	
		if (!attachment->att_event_session &&
			!(attachment->att_event_session = EVENT_create_session(user_status)))
			return error(user_status);
	
		*id = EVENT_que(user_status,
						attachment->att_event_session,
						lock->lck_length,
						(TEXT *) & lock->lck_key, length, items, ast, arg);
	
	#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_handle_returned, *id);
	#endif
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_RECEIVE(STATUS * user_status,
							  JRD_REQ * req_handle,
							  USHORT msg_type,
							  USHORT msg_length, SCHAR * msg, SSHORT level
#ifdef SCROLLABLE_CURSORS
							  , USHORT direction, ULONG offset
#endif
	)
{
/**************************************
 *
 *	g d s _ $ r e c e i v e
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	JRD_REQ request;
	VEC vector;
	USHORT lev;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*req_handle), type_req, gds_bad_req_handle);
	request = *req_handle;

	if (check_database(tdbb, request->req_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_receive2, *req_handle, msg_type, msg_length, level);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		if ( (lev = level) )
			if (!(vector = request->req_sub_requests) ||
				lev >= vector->count() ||
				!(request = (JRD_REQ) (*vector)[lev]))
					ERR_post(gds_req_sync, 0);
	
	#ifdef SCROLLABLE_CURSORS
		if (direction)
			EXE_seek(tdbb, request, direction, offset);
	#endif
	
		EXE_receive(tdbb, request, msg_type, msg_length,
					reinterpret_cast < UCHAR * >(msg));
	
		check_autocommit(request, tdbb);
	
		if (request->req_flags & req_warning) {
			request->req_flags &= ~req_warning;
			return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_RECONNECT(STATUS * user_status,
								ATT * db_handle,
								JRD_TRA * tra_handle, SSHORT length, UCHAR * id)
{
/**************************************
 *
 *	g d s _ $ r e c o n n e c t
 *
 **************************************
 *
 * Functional description
 *	Connect to a transaction in limbo.
 *
 **************************************/
	JRD_TRA transaction;
	ATT attachment;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	NULL_CHECK(tra_handle, gds_bad_trans_handle);
	attachment = *db_handle;

	if (check_database(tdbb, attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_reconnect, *db_handle, *tra_handle, length, id);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		transaction = TRA_reconnect(tdbb, id, length);
		*tra_handle = transaction;
	
	#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_handle_returned, *tra_handle);
	#endif
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_RELEASE_REQUEST(STATUS * user_status, JRD_REQ * req_handle)
{
/**************************************
 *
 *	g d s _ $ r e l e a s e _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	Release a request.
 *
 **************************************/
	JRD_REQ request;
	ATT attachment;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*req_handle), type_req, gds_bad_req_handle);
	request = *req_handle;
	attachment = request->req_attachment;

	if (check_database(tdbb, attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_release_request, *req_handle);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		CMP_release(tdbb, request);
		*req_handle = NULL;
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_REQUEST_INFO(STATUS * user_status,
								   JRD_REQ * req_handle,
								   SSHORT level,
								   SSHORT item_length,
								   SCHAR * items,
								   SSHORT buffer_length, SCHAR * buffer)
{
/**************************************
 *
 *	g d s _ $ r e q u e s t _ i n f o
 *
 **************************************
 *
 * Functional description
 *	Provide information on blob object.
 *
 **************************************/
	USHORT lev;
	JRD_REQ request;
	VEC vector;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	request = *req_handle;
	CHECK_HANDLE(request, type_req, gds_bad_req_handle);

	if (check_database(tdbb, request->req_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_request_info2, *req_handle, level, item_length, items,
			 buffer_length);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		if ( (lev = level) )
			if (!(vector = request->req_sub_requests) ||
				lev >= vector->count() ||
				!(request = (JRD_REQ) (*vector)[lev]))
					ERR_post(gds_req_sync, 0);

		INF_request_info(request, items, item_length, buffer, buffer_length);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_ROLLBACK_RETAINING(STATUS * user_status,
										 JRD_TRA * tra_handle)
{
/**************************************
 *
 *	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
 *
 **************************************/
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	transaction = *tra_handle;
	CHECK_HANDLE(transaction, type_tra, gds_bad_trans_handle);

	if (check_database(tdbb, transaction->tra_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_rollback, *tra_handle);
#endif

	if (rollback(tdbb, transaction, user_status, TRUE))
		return error(user_status);

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_ROLLBACK(STATUS * user_status, JRD_TRA * tra_handle)
{
/**************************************
 *
 *	g d s _ $ r o l l b a c k
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction.
 *
 **************************************/
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	transaction = *tra_handle;
	CHECK_HANDLE(transaction, type_tra, gds_bad_trans_handle);

	if (check_database(tdbb, transaction->tra_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_rollback, *tra_handle);
#endif

	if (rollback(tdbb, transaction, user_status, FALSE))
		return error(user_status);

	*tra_handle = NULL;
	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SEEK_BLOB(STATUS * user_status,
								BLB * blob_handle,
								SSHORT mode, SLONG offset, SLONG * result)
{
/**************************************
 *
 *	g d s _ $ s e e k _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Seek a stream blob.
 *
 **************************************/
	BLB blob;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (!(blob = check_blob(tdbb, user_status, blob_handle)))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_blob_seek, *blob_handle, mode, offset);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		*result = BLB_lseek(blob, mode, offset);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SEND(STATUS * user_status,
						   JRD_REQ * req_handle,
						   USHORT msg_type,
						   USHORT msg_length, SCHAR * msg, SSHORT level)
{
/**************************************
 *
 *	g d s _ $ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	JRD_REQ request;
	VEC vector;
	USHORT lev;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*req_handle), type_req, gds_bad_req_handle);
	request = *req_handle;

	if (check_database(tdbb, request->req_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_send, *req_handle, msg_type, msg_length, msg, level);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		if ( (lev = level) )
			if (!(vector = request->req_sub_requests) ||
				lev >= vector->count() ||
				!(request = (JRD_REQ) (*vector)[lev]))
					ERR_post(gds_req_sync, 0);
	
		EXE_send(tdbb, request, msg_type, msg_length,
				reinterpret_cast < UCHAR * >(msg));
	
		check_autocommit(request, tdbb);
	
		if (request->req_flags & req_warning) {
			request->req_flags &= ~req_warning;
			return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SERVICE_ATTACH(STATUS * user_status,
									 USHORT service_length,
									 TEXT * service_name,
									 SVC * svc_handle,
									 USHORT spb_length, SCHAR * spb)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ a t t a c h
 *
 **************************************
 *
 * Functional description
 *	Connect to an Interbase service.
 *
 **************************************/
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	if (*svc_handle)
		return handle_error(user_status, gds_bad_svc_handle, 0);

	struct tdbb* tdbb = set_thread_data(thd_context);

	tdbb->tdbb_status_vector = user_status;
	try
	{
		tdbb->tdbb_database = NULL;
	
		*svc_handle = SVC_attach(service_length, service_name, spb_length, spb);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SERVICE_DETACH(STATUS * user_status, SVC * svc_handle)
{
/**************************************
 *
 *	g d s _ $ s e r v i c e _ d e t a c h
 *
 **************************************
 *
 * Functional description
 *	Close down a service.
 *
 **************************************/
	SVC service;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	service = *svc_handle;
	CHECK_HANDLE(service, type_svc, gds_bad_svc_handle);

	tdbb->tdbb_status_vector = user_status;
	try
	{
		tdbb->tdbb_database = NULL;
	
		SVC_detach(service);
	
		*svc_handle = NULL;
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SERVICE_QUERY(STATUS*	user_status,
									SVC*	svc_handle,
									ULONG*	reserved,
									USHORT	send_item_length,
									SCHAR*	send_items,
									USHORT	recv_item_length,
									SCHAR*	recv_items,
									USHORT	buffer_length,
									SCHAR*	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.
 *
 **************************************/
	SVC service;
	struct tdbb thd_context;
	int len, warning;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	service = *svc_handle;
	CHECK_HANDLE(service, type_svc, gds_bad_svc_handle);

	tdbb->tdbb_status_vector = user_status;
	tdbb->tdbb_database = NULL;

	try
	{
		if (service->svc_spb_version == isc_spb_version1)
			SVC_query(service, send_item_length, send_items, recv_item_length,
					recv_items, buffer_length, 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(service, tdbb, send_item_length, send_items,
					recv_item_length, recv_items, buffer_length, buffer);
	
			/* if there is a status vector from a service thread, copy it into the thread status */
			PARSE_STATUS(service->svc_status, len, warning);
			if (len) {
				MOVE_FASTER(service->svc_status, tdbb->tdbb_status_vector,
							sizeof(STATUS) * len);
	
				/* Empty out the service status vector */
				memset(service->svc_status, 0,
					ISC_STATUS_LENGTH * sizeof(STATUS));
			}
	
			if (user_status[1])
				return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}
	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_SERVICE_START(STATUS*	user_status,
									SVC*	svc_handle,
									ULONG*	reserved,
									USHORT	spb_length,
									SCHAR*	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.
 **************************************/
	SVC service;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	service = *svc_handle;
	CHECK_HANDLE(service, type_svc, isc_bad_svc_handle);

	tdbb->tdbb_status_vector = user_status;
	tdbb->tdbb_database = NULL;

	try
	{
		SVC_start(service, spb_length, spb);
	
		if (service->svc_status[1]) {
			STATUS* svc_status = service->svc_status;
			STATUS* tdbb_status = tdbb->tdbb_status_vector;
	
			while (*svc_status) {
				*tdbb_status++ = *svc_status++;
			}
			*tdbb_status = isc_arg_end;
		}
	
		if (user_status[1]) {
			return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_START_AND_SEND(STATUS * user_status,
									 JRD_REQ * req_handle,
									 JRD_TRA * tra_handle,
									 USHORT msg_type,
									 USHORT msg_length,
									 SCHAR * msg, SSHORT level)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ a n d _ s e n d
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	JRD_REQ request = *req_handle;
	CHECK_HANDLE(request, type_req, gds_bad_req_handle);

	if (check_database(tdbb, request->req_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_start_and_send, *req_handle, *tra_handle, msg_type,
			 msg_length, msg, level);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		JRD_TRA transaction = find_transaction(tdbb, *tra_handle, gds_req_wrong_db);
	
		if (level)
			request = CMP_clone_request(tdbb, request, level, FALSE);
	
		EXE_unwind(tdbb, request);
		EXE_start(tdbb, request, transaction);
		EXE_send(tdbb, request, msg_type, msg_length,
				reinterpret_cast < UCHAR * >(msg));
	
		check_autocommit(request, tdbb);
	
		if (request->req_flags & req_warning) {
			request->req_flags &= ~req_warning;
			return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_START(STATUS * user_status,
							JRD_REQ * req_handle,
							JRD_TRA * tra_handle, SSHORT level)
{
/**************************************
 *
 *	g d s _ $ s t a r t
 *
 **************************************
 *
 * Functional description
 *	Get a record from the host program.
 *
 **************************************/
	JRD_TRA transaction;
	JRD_REQ request;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	request = *req_handle;
	CHECK_HANDLE(request, type_req, gds_bad_req_handle);

	if (check_database(tdbb, request->req_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_start, *req_handle, *tra_handle, level);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		transaction = find_transaction(tdbb, *tra_handle, gds_req_wrong_db);
	
		if (level)
			request = CMP_clone_request(tdbb, request, level, FALSE);
	
		EXE_unwind(tdbb, request);
		EXE_start(tdbb, request, transaction);
	
		check_autocommit(request, tdbb);
	
		if (request->req_flags & req_warning) {
			request->req_flags &= ~req_warning;
			return error(user_status);
		}
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_START_MULTIPLE(STATUS * user_status,
									 JRD_TRA * tra_handle,
									 USHORT count, TEB * vector)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ m u l t i p l e
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	volatile JRD_TRA transaction, prior;
	STATUS temp_status[ISC_STATUS_LENGTH];
	TEB *v, *end;
	ATT attachment;
	struct tdbb thd_context;
	DBB dbb;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	NULL_CHECK(tra_handle, gds_bad_trans_handle);
	end = vector + count;

	for (v = vector; v < end; v++) {
		if (check_database(tdbb, *v->teb_database, user_status))
			return user_status[1];
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
	}

	if (check_database(tdbb, *vector->teb_database, user_status))
		return user_status[1];

	prior = NULL;

	try {

	for (v = vector; v < end; v++)
	{
		attachment = *v->teb_database;
		if (check_database(tdbb, attachment, user_status)) {
			return user_status[1];
		}
#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
		LOG_call(log_start_multiple, *tra_handle, count, vector);
#endif
		tdbb->tdbb_status_vector = user_status;
		transaction =
			TRA_start(tdbb, v->teb_tpb_length,
					  reinterpret_cast<char*>(v->teb_tpb));
		transaction->tra_sibling = prior;
		prior = transaction;
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
	}

	}	// try
	catch (const std::exception&) {
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
		if (prior) {
			rollback(tdbb, prior, temp_status, FALSE);
		}
		return error(user_status);
	}

	*tra_handle = transaction;
#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_handle_returned, *tra_handle);
#endif

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_START_TRANSACTION(STATUS * user_status,
										JRD_TRA * tra_handle, SSHORT count, ...)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	TEB tebs[16], *teb, *end;
	va_list ptr;

	api_entry_point_init(user_status);

	VA_START(ptr, count);

	for (teb = tebs, end = teb + count; teb < end; teb++) {
		teb->teb_database = va_arg(ptr, ATT *);
		teb->teb_tpb_length = va_arg(ptr, int);
		teb->teb_tpb = va_arg(ptr, UCHAR *);
	}

	return GDS_START_MULTIPLE(user_status, tra_handle, count, tebs);
}


STATUS DLL_EXPORT GDS_TRANSACT_REQUEST(STATUS*	user_status,
									   ATT*		db_handle,
									   JRD_TRA*		tra_handle,
									   USHORT	blr_length,
									   SCHAR*	blr,
									   USHORT	in_msg_length,
									   SCHAR*	in_msg,
									   USHORT	out_msg_length,
									   SCHAR*	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.
 *
 **************************************/
	ATT attachment;
	JRD_TRA transaction;
	CSB csb;
	JRD_REQ request;
	JRD_NOD in_message, out_message, node;
	ACC access;
	SCL class_;
	FMT format;
	JrdMemoryPool *old_pool, *new_pool;
	USHORT i, len;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	attachment = *db_handle;
	if (check_database(tdbb, attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_transact_request, *db_handle, *tra_handle,
			 blr_length, blr, in_msg_length, in_msg, out_msg_length);
#endif

	new_pool = old_pool = NULL;
	request = NULL;

	tdbb->tdbb_status_vector = user_status;

	try {

	transaction = find_transaction(tdbb, *tra_handle, gds_req_wrong_db);

	old_pool = tdbb->tdbb_default;
	tdbb->tdbb_default = new_pool = JrdMemoryPool::createPool();

	csb = PAR_parse(tdbb, reinterpret_cast < UCHAR * >(blr), FALSE);
	request = CMP_make_request(tdbb, &csb);

	for (access = request->req_access; access; access = access->acc_next)
	{
		class_ = SCL_get_class(access->acc_security_name);
		SCL_check_access(class_, access->acc_view, access->acc_trg_name,
						 access->acc_prc_name, access->acc_mask,
						 access->acc_type, access->acc_name);
	}

	in_message = out_message = NULL;
	for (i = 0; i < csb->csb_count; i++)
	{
		if ( (node = csb->csb_rpt[i].csb_message) )
		{
			if ((int) node->nod_arg[e_msg_number] == 0) {
				in_message = node;
			} else if ((int) node->nod_arg[e_msg_number] == 1) {
				out_message = node;
			}
		}
	}

	tdbb->tdbb_default = old_pool;
	old_pool = NULL;

	request->req_attachment = attachment;

	if (in_msg_length)
	{
		if (in_message) {
			format = (FMT) in_message->nod_arg[e_msg_format];
			len = format->fmt_length;
		}
		else {
			len = 0;
		}
		if (in_msg_length != len)
		{
			ERR_post(gds_port_len,
					 gds_arg_number, (SLONG) in_msg_length,
					 gds_arg_number, (SLONG) len, 0);
		}
		if ((U_IPTR) in_msg & (ALIGNMENT - 1)) {
			MOVE_FAST(in_msg, (SCHAR *) request + in_message->nod_impure,
					  in_msg_length);
		}
		else {
			MOVE_FASTER(in_msg, (SCHAR *) request + in_message->nod_impure,
						in_msg_length);
		}
	}

	EXE_start(tdbb, request, transaction);

	if (out_message) {
		format = (FMT) out_message->nod_arg[e_msg_format];
		len = format->fmt_length;
	}
	else {
		len = 0;
	}
	if (out_msg_length != len) {
		ERR_post(gds_port_len,
				 gds_arg_number, (SLONG) out_msg_length,
				 gds_arg_number, (SLONG) len, 0);
	}

	if (out_msg_length) {
		if ((U_IPTR) out_msg & (ALIGNMENT - 1)) {
			MOVE_FAST((SCHAR *) request + out_message->nod_impure, out_msg,
					  out_msg_length);
		}
		else {
			MOVE_FASTER((SCHAR *) request + out_message->nod_impure, out_msg,
						out_msg_length);
		}
	}

	check_autocommit(request, tdbb);

	CMP_release(tdbb, request);

	return return_success(tdbb);

	}	// try
	catch (const std::exception&)
	{
		/* Set up to trap error in case release pool goes wrong. */

		try {
			if (old_pool) {
				tdbb->tdbb_default = old_pool;
			}
			if (request) {
				CMP_release(tdbb, request);
			} else if (new_pool) {
				JrdMemoryPool::deletePool(new_pool);
			}
		}	// try
		catch (const std::exception&) {
		}

		return error(user_status);
	}	// catch
}


STATUS DLL_EXPORT GDS_TRANSACTION_INFO(STATUS * user_status,
									   JRD_TRA * tra_handle,
									   SSHORT item_length,
									   SCHAR * items,
									   SSHORT buffer_length, SCHAR * 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.
 *
 **************************************/
	JRD_TRA transaction;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	transaction = *tra_handle;
	CHECK_HANDLE(transaction, type_tra, gds_bad_trans_handle);

	if (check_database(tdbb, transaction->tra_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_transaction_info2, *tra_handle, item_length, items,
			 buffer_length);
#endif

	tdbb->tdbb_status_vector = user_status;
	try
	{
		INF_transaction_info(transaction, items, item_length, buffer,
						 buffer_length);
	}
	catch (const std::exception&)
	{
		return error(user_status);
	}

	return return_success(tdbb);
}


STATUS DLL_EXPORT GDS_UNWIND(STATUS * user_status,
							 JRD_REQ * req_handle, SSHORT 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.
 *
 **************************************/
	DBB dbb;
	ATT attachment, attach;
	JRD_REQ request;
	VEC vector;
	USHORT lev;
	struct tdbb thd_context;

	api_entry_point_init(user_status);

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*req_handle), type_req, gds_bad_req_handle);
	request = *req_handle;

/* Make sure blocks look and feel kosher */

	if (!(attachment = request->req_attachment) ||
		(MemoryPool::blk_type(attachment) != type_att) ||
		!(dbb = attachment->att_database) ||
		MemoryPool::blk_type(dbb) != type_dbb)
	{
		return handle_error(user_status, gds_bad_db_handle, tdbb);
	}

/* Make sure this is a valid attachment */

	for (attach = dbb->dbb_attachments; attach; attach = attach->att_next)
	{
		if (attach == attachment) {
			break;
		}
	}

	if (!attach) {
		return handle_error(user_status, gds_bad_db_handle, tdbb);
	}

	tdbb->tdbb_database = dbb;

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call(log_unwind, *req_handle, level);
#endif

/* Set up error handling to restore old state */

	tdbb->tdbb_status_vector = user_status;
	tdbb->tdbb_attachment = attachment;

	try {

/* Pick up and validate request level */

		if ( (lev = level) ) {
			if (!(vector = request->req_sub_requests) ||
				lev >= vector->count() ||
				!(request = (JRD_REQ) (*vector)[lev]))
			{
				ERR_post(gds_req_sync, 0);
			}
		}

	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;

/* Unwind request.  This just tweaks some bits */

	EXE_unwind(tdbb, request);

/* Restore old state and get out */

	JRD_restore_context();

	user_status[0] = gds_arg_gds;
	user_status[2] = gds_arg_end;

	return (user_status[1] = FB_SUCCESS);

	}	// try
	catch (const std::exception&) {
		JRD_restore_context();
		return user_status[1];
	}
}


#ifdef MULTI_THREAD
void JRD_blocked(ATT blocking, BTB * que)
{
/**************************************
 *
 *	J R D _ b l o c k e d
 *
 **************************************
 *
 * Functional description
 *	We're blocked by another thread.  Unless it would cause
 *	a deadlock, wait for the other other thread (it will
 *	wake us up.
 *
 **************************************/
	ATT attachment;

	TDBB tdbb = get_thread_data();
	DBB  dbb  = tdbb->tdbb_database;

/* Check for deadlock.  If there is one, complain */

	for (attachment = blocking;
		 attachment;
		 attachment = attachment->att_blocking)
	{
		if (attachment == tdbb->tdbb_attachment) {
			ERR_post(gds_deadlock, 0);
		}
	}

	BTB block = dbb->dbb_free_btbs;
	if (block) {
		dbb->dbb_free_btbs = block->btb_next;
	} else {
		block = FB_NEW(*dbb->dbb_permanent) btb;
	}

	block->btb_thread_id = (SLONG) SCH_current_thread();
	block->btb_next = *que;
	*que = block;
	attachment = tdbb->tdbb_attachment;
	attachment->att_blocking = blocking;

	SCH_hiber();

	attachment->att_blocking = NULL;
}
#endif


#ifdef SUPERSERVER
USHORT JRD_getdir(TEXT * buf, USHORT len)
{
/**************************************
 *
 *	J R D _ g e t d i r
 *
 **************************************
 *
 * Functional description
 *	Current working directory is cached in the attachment
 *	block.  get it out. This function could be called before
 *	an attachment is created. In such a case thread specific
 *	data (t_data) will hold the user name which will be used
 *	to get the users home directory.
 *
 **************************************/
	char *t_data = NULL;

	assert(buf != NULL);
	assert(len > 0);

	THD_getspecific_data((void **) &t_data);

	if (t_data) {
#ifdef WIN_NT
		GetCurrentDirectory(len, buf);
#else
		struct passwd *pwd;
		strcpy(buf, t_data);
		pwd = getpwnam(buf);
		if (pwd)
			strcpy(buf, pwd->pw_dir);
		else	/* No home dir for this users here. Default to server dir */
#ifdef HAVE_GETCWD
			getcwd(buf, len);
#else
			getwd(buf);
#endif
#endif
	}
	else
	{
		TDBB tdbb = get_thread_data();
		ATT attachment;

   /** If the server has not done a SET_THREAD_DATA prior to this call
       (which will be the case when connecting via IPC), tdbb will
       be NULL so do not attempt to get the attachment handle from
       tdbb. Just return 0 as described below.  NOTE:  The only time
       this code is entered via IPC is if the database name = "".
   **/

   /** In case of backup/restore APIs, SET_THREAD_DATA has been done but
       the thread's context is a 'gbak' specific, so don't try extract
       attachment from there.
   **/

		if (tdbb && (tdbb->tdbb_thd_data.thdd_type == THDD_TYPE_TDBB))
			attachment = tdbb->tdbb_attachment;
		else
			return 0;

   /**
    An older version of client will not be sending isc_dpb_working directory
    so in all probabilities attachment->att_working_directory will be null.
    return 0 so that ISC_expand_filename will create the file in fbserver's dir
   **/
		if (!attachment->att_working_directory ||
			len - 1 < attachment->att_working_directory->str_length) return 0;
		memcpy(buf, attachment->att_working_directory->str_data,
			   attachment->att_working_directory->str_length);
		buf[attachment->att_working_directory->str_length] = 0;
	}

	return strlen(buf);
}
#endif /* SUPERSERVER */


void JRD_mutex_lock(MUTX mutex)
{
/**************************************
 *
 *	J R D _ m u t e x _ l o c k
 *
 **************************************
 *
 * Functional description
 *	Lock a mutex and note this fact
 *	in the thread context block.
 *
 **************************************/
	TDBB tdbb = get_thread_data();
	INUSE_insert(&tdbb->tdbb_mutexes, (void *) mutex, TRUE);
	THD_MUTEX_LOCK(mutex);
}


void JRD_mutex_unlock(MUTX mutex)
{
/**************************************
 *
 *	J R D _ m u t e x _ u n l o c k
 *
 **************************************
 *
 * Functional description
 *	Unlock a mutex and note this fact
 *	in the thread context block.
 *
 **************************************/
	TDBB tdbb = get_thread_data();
	INUSE_remove(&tdbb->tdbb_mutexes, (void *) mutex, FALSE);
	THD_MUTEX_UNLOCK(mutex);
}


#ifdef SUPERSERVER
void JRD_print_all_counters(char *fname)
{
/*****************************************************
 *
 *	J R D _ p r i n t _ a l l _ c o u n t e r s
 *
 *****************************************************
 *
 * Functional description
 *	print memory counters from DSQL, ENGINE & REMOTE
 *      component
 *
 ******************************************************/
	IB_FILE *fptr;

	if (!trace_pools)
		return;

	if (!(fptr = ib_fopen(fname, "a+"))) {
		char buff[256];
		sprintf(buff, "Failed to open %s", fname);
		gds__log(buff, 0);
		return;
	}
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(databases_mutex);
#endif

	ib_fprintf(fptr, "\nPrinting Block type Report\n");
	ib_fprintf(fptr, "==========================\n");
	gds_print_delta_counters(fptr);
	ALL_print_memory_pool_info(fptr, databases);
//	ALLD_print_memory_pool_info(fptr);

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif

	ib_fclose(fptr);
}

#ifdef DEBUG_PROCS
void JRD_print_procedure_info(TDBB tdbb, 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
 *
 ******************************************************/
	IB_FILE *fptr;
	TEXT fname[MAXPATHLEN];
	JRD_PRC procedure;
	vec::iterator ptr, end;
	VEC procedures;

	gds__prefix(fname, "proc_info.log");
	if (!(fptr = ib_fopen(fname, "a+"))) {
		char buff[256];
		sprintf(buff, "Failed to open %s\n", fname);
		gds__log(buff, 0);
		return;
	}

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

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(databases_mutex);
#endif

	if (procedures = tdbb->tdbb_database->dbb_procedures) {
		for (ptr = procedures->begin(), end = procedures->end();
					ptr < end; ptr++)
			if ( (procedure = *ptr) )
				ib_fprintf(fptr, "%s  ,  %d,  %X,  %d, %d\n",
						   (procedure->
							prc_name) ? (char *) procedure->prc_name->
						   str_data : "NULL", procedure->prc_id,
						   procedure->prc_flags, procedure->prc_use_count,
						   procedure->prc_alter_count);
	}
	else
		ib_fprintf(fptr, "No Cached Procedures\n");

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif

	ib_fclose(fptr);

}
#endif /* DEBUG_PROCS */
#endif /* SUPERSERVER */


#ifdef MULTI_THREAD
BOOLEAN JRD_reschedule(TDBB tdbb, SLONG quantum, BOOLEAN 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.
 *
 **************************************/
	DBB dbb;
	ATT attachment;
	STATUS *status;

	if (tdbb->tdbb_inhibit)
		return FALSE;

/* Force garbage colletion activity to yield the
   processor in case client threads haven't had
   an opportunity to enter the scheduling queue. */

	if (!(tdbb->tdbb_flags & TDBB_sweeper))
		SCH_schedule();
	else {
		THREAD_EXIT;
		THREAD_YIELD;
		THREAD_ENTER;
	}

/* If database has been shutdown then get out */

	dbb = tdbb->tdbb_database;
	if (attachment = tdbb->tdbb_attachment) {
		if (dbb->dbb_ast_flags & DBB_shutdown &&
			attachment->att_flags & ATT_shutdown) {
			if (punt) {
				CCH_unwind(tdbb, FALSE);
				ERR_post(isc_shutdown, 0);
			}
			else {
				status = tdbb->tdbb_status_vector;
				*status++ = isc_arg_gds;
				*status++ = isc_shutdown;
				*status++ = isc_arg_end;
				return TRUE;
			}
		}
#ifdef CANCEL_OPERATION

		/* 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)) {
			JRD_REQ request;
			JRD_TRA transaction;

			if ((!(request = tdbb->tdbb_request) ||
				 !(request->req_flags & (req_internal | req_sys_trigger))) &&
				(!(transaction = tdbb->tdbb_transaction) ||
				 !(transaction->tra_flags & TRA_system))) {
				attachment->att_flags &= ~ATT_cancel_raise;
				if (punt) {
					CCH_unwind(tdbb, FALSE);
					ERR_post(isc_cancelled, 0);
				}
				else {
					status = tdbb->tdbb_status_vector;
					*status++ = isc_arg_gds;
					*status++ = isc_cancelled;
					*status++ = isc_arg_end;
					return TRUE;
				}
			}
		}
#endif
	}

	tdbb->tdbb_quantum = (tdbb->tdbb_quantum <= 0) ?
		(quantum ? quantum : (THPS_BOOSTDONE() ? 
			Config::getPriorityBoost() : 1) * QUANTUM) : 
		tdbb->tdbb_quantum;

	return FALSE;
}
#endif


void JRD_restore_context(void)
{
/**************************************
 *
 *	J R D _ r e s t o r e _ c o n t e x t
 *
 **************************************
 *
 * Functional description
 *	Restore the previous thread specific data
 *	and cleanup and objects that remain in use.
 *
 **************************************/
	TDBB tdbb = get_thread_data();
	BOOLEAN cleaned_up;

	cleaned_up =
		INUSE_cleanup(&tdbb->tdbb_mutexes, (FPTR_VOID) THD_mutex_unlock);
	cleaned_up |=
		INUSE_cleanup(&tdbb->tdbb_rw_locks, (FPTR_VOID) THD_wlck_unlock);
/* Charlie will fill this in
cleaned_up |= INUSE_cleanup (&tdbb->tdbb_pages, (FPTR_VOID) CCH_?);
*/
	THD_restore_specific();

#ifdef DEV_BUILD
	if (tdbb->tdbb_status_vector &&
		!tdbb->tdbb_status_vector[1]
		&& cleaned_up)
	{
		gds__log("mutexes or pages in use on successful return");
	}
#endif
}


void JRD_set_context(TDBB tdbb)
{
/**************************************
 *
 *	J R D _ s e t _ c o n t e x t
 *
 **************************************
 *
 * Functional description
 *	Set the thread specific data.  Initialize
 *	the in-use blocks so that we can unwind
 *	cleanly if an error occurs.
 *
 **************************************/

	INUSE_clear(&tdbb->tdbb_mutexes);
	INUSE_clear(&tdbb->tdbb_rw_locks);
	INUSE_clear(&tdbb->tdbb_pages);
	tdbb->tdbb_status_vector = NULL;
	THD_put_specific((THDD) tdbb);
	tdbb->tdbb_thd_data.thdd_type = THDD_TYPE_TDBB;
}


#ifdef MULTI_THREAD
void JRD_unblock(BTB * que)
{
/**************************************
 *
 *	J R D _ u n b l o c k
 *
 **************************************
 *
 * Functional description
 *	Unblock a linked list of blocked threads.  Rather
 *	than worrying about which, let 'em all loose.
 *
 **************************************/
	BTB block;

	DBB dbb = get_dbb();

	while (block = *que) {
		*que = block->btb_next;
		if (block->btb_thread_id) {
			SCH_wake((struct thread *) block->btb_thread_id);
		}
		block->btb_next = dbb->dbb_free_btbs;
		dbb->dbb_free_btbs = block;
	}
}
#endif


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) {
		do {
			*field++ = ' ';
		} while (--length);
	}
}

static BLB check_blob(TDBB tdbb, STATUS * user_status, BLB * blob_handle)
{
/**************************************
 *
 *	c h e c k _ b l o b
 *
 **************************************
 *
 * Functional description
 *	Check out a blob handle for goodness.  Return
 *	the address of the blob if ok, NULL otherwise.
 *
 **************************************/
	BLB blob;
	JRD_TRA transaction;

	SET_TDBB(tdbb);
	blob = *blob_handle;

	if (!blob ||
		(MemoryPool::blk_type(blob) != type_blb) ||
		check_database(tdbb, blob->blb_attachment, user_status) ||
		!(transaction = blob->blb_transaction) ||
		MemoryPool::blk_type(transaction) != type_tra) {
		handle_error(user_status, gds_bad_segstr_handle, tdbb);
		return NULL;
	}

	tdbb->tdbb_transaction = transaction;

	return blob;
}


static STATUS check_database(TDBB tdbb, ATT attachment, STATUS * user_status)
{
/**************************************
 *
 *	c h e c k _ d a t a b a s e
 *
 **************************************
 *
 * Functional description
 *	Check an attachment for validity, setting
 *	up environment.
 *
 **************************************/
	DBB dbb;
	STATUS *ptr;
	TEXT *string;

#ifndef SUPERSERVER
	ATT attach;
#endif /* SUPERSERVER */

	SET_TDBB(tdbb);

/* Make sure blocks look and feel kosher */

	if (!attachment ||
		(MemoryPool::blk_type(attachment) != type_att) ||
		!(dbb = attachment->att_database) ||
		MemoryPool::blk_type(dbb)!= type_dbb)
		return handle_error(user_status, gds_bad_db_handle, tdbb);

/* Make sure this is a valid attachment */

#ifndef SUPERSERVER
	for (attach = dbb->dbb_attachments; attach; attach = attach->att_next)
		if (attach == attachment)
			break;

	if (!attach)
		return handle_error(user_status, gds_bad_db_handle, tdbb);
#endif

	tdbb->tdbb_database = dbb;
	tdbb->tdbb_attachment = attachment;
	tdbb->tdbb_quantum = QUANTUM;
	tdbb->tdbb_request = NULL;
	tdbb->tdbb_transaction = NULL;
	tdbb->tdbb_default = NULL;
	tdbb->tdbb_inhibit = 0;
	tdbb->tdbb_flags = 0;

/* Count active threads in database */

	++dbb->dbb_use_count;

	if (dbb->dbb_flags & DBB_bugcheck) {
		tdbb->tdbb_status_vector = ptr = user_status;
		*ptr++ = gds_arg_gds;
		*ptr++ = gds_bug_check;
		*ptr++ = gds_arg_string;
		string = "can't continue after bugcheck";
		*ptr++ = (STATUS) string;
		*ptr = gds_arg_end;
		return error(user_status);
	}

	if (attachment->att_flags & ATT_shutdown ||
		(dbb->dbb_ast_flags & DBB_shutdown &&
		 !(attachment->att_user->usr_flags & (USR_locksmith | USR_owner)))) {
		tdbb->tdbb_status_vector = ptr = user_status;
		*ptr++ = gds_arg_gds;
		*ptr++ = gds_shutdown;
		*ptr++ = gds_arg_cstring;
		*ptr++ = attachment->att_filename->str_length;
		string = reinterpret_cast<char*>(attachment->att_filename->str_data);
		*ptr++ = (STATUS) string;
		*ptr = gds_arg_end;
		return error(user_status);
	}

#ifdef CANCEL_OPERATION
	if ((attachment->att_flags & ATT_cancel_raise) &&
		!(attachment->att_flags & ATT_cancel_disable)) {
		attachment->att_flags &= ~ATT_cancel_raise;
		tdbb->tdbb_status_vector = ptr = user_status;
		*ptr++ = isc_arg_gds;
		*ptr++ = isc_cancelled;
		*ptr++ = isc_arg_end;
		return error(user_status);
	}
#endif

	return FB_SUCCESS;
}


static void cleanup(void *arg)
{
/**************************************
 *
 *	c l e a n u p
 *
 **************************************
 *
 * Functional description
 *	Exit handler for image exit.
 *
 **************************************/
#if defined(V4_THREADING) && !defined(SUPERSERVER)
	V4_MUTEX_DESTROY(databases_mutex);
#endif
	JRD_SS_DESTROY_MUTEX;
	initialized = FALSE;
	databases = NULL;
}


static STATUS commit(
					 STATUS * user_status,
					 JRD_TRA * tra_handle, USHORT retaining_flag)
{
/**************************************
 *
 *	c o m m i t
 *
 **************************************
 *
 * Functional description
 *	Commit a transaction.
 *
 **************************************/
	JRD_TRA transaction, next;
	STATUS *ptr;
	DBB dbb;
	struct tdbb thd_context;

	struct tdbb* tdbb = set_thread_data(thd_context);

	CHECK_HANDLE((*tra_handle), type_tra, gds_bad_trans_handle);
	next = transaction = *tra_handle;

	if (check_database(tdbb, transaction->tra_attachment, user_status))
		return user_status[1];

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	LOG_call((retaining_flag) ? log_commit_retaining : log_commit,
			 *tra_handle);
#endif

	ptr = user_status;

	if (transaction->tra_sibling &&
		!(transaction->tra_flags & TRA_prepared) &&
		prepare(tdbb, transaction, ptr, 0, NULL))
	{
		return error(user_status);
	}

	try {

	while ( (transaction = next) ) {
		next = transaction->tra_sibling;
		check_database(tdbb, transaction->tra_attachment, user_status);
		tdbb->tdbb_status_vector = ptr;
		TRA_commit(tdbb, transaction, retaining_flag);
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
	}

	return return_success(tdbb);

	}	// try
	catch (const std::exception&) {
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
		return error(user_status);
	}
}


static STR copy_string(TEXT * ptr, USHORT length)
{
/**************************************
 *
 *	c o p y _ s t r i n g
 *
 **************************************
 *
 * Functional description
 *	Copy a string to a string block.
 *
 **************************************/
	DBB dbb = get_dbb();
	STR string = FB_NEW_RPT(*dbb->dbb_permanent, length) str();

	string->str_length = length;
	MOVE_FAST(ptr, string->str_data, length);

	return string;
}


static BOOLEAN drop_files(FIL file)
{
/**************************************
 *
 *	d r o p _ f i l e s
 *
 **************************************
 *
 * Functional description
 *	drop a linked list of files
 *
 **************************************/
	DBB dbb;
	STATUS status[ISC_STATUS_LENGTH];

	status[1] = FB_SUCCESS;

	for (; file; file = file->fil_next)
	{
		if (unlink(file->fil_string))
		{
			IBERR_build_status(status, isc_io_error,
							   gds_arg_string, "unlink",
							   gds_arg_string,
							   ERR_cstring(file->fil_string),
							   isc_arg_gds, isc_io_delete_err,
							   SYS_ERR, errno,
							   0);
			dbb = get_dbb();
			gds__log_status(dbb->dbb_file->fil_string, status);
		}
	}

	return status[1] ? TRUE : FALSE;
}


static JRD_TRA find_transaction(TDBB tdbb, JRD_TRA transaction, 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);

	if (!transaction || MemoryPool::blk_type(transaction) != type_tra)
		ERR_post(gds_bad_trans_handle, 0);

	for (; transaction; transaction = transaction->tra_sibling)
		if (transaction->tra_attachment == tdbb->tdbb_attachment) {
			tdbb->tdbb_transaction = transaction;
			return transaction;
		}

	ERR_post(error_code, 0);
	return ((JRD_TRA) NULL);		/* Added to remove compiler warnings */
}


static STATUS error(STATUS * user_status)
{
/**************************************
 *
 *	e r r o r
 *
 **************************************
 *
 * Functional description
 *	An error returned has been trapped.  Return a status code.
 *
 **************************************/
	TDBB tdbb = get_thread_data();
	DBB dbb;

/* Decrement count of active threads in database */

	if ( (dbb = tdbb->tdbb_database) ) {
		--dbb->dbb_use_count;
	}

	JRD_restore_context();

/* This is debugging code which is meant to verify that
   the database use count is cleared on exit from the
   engine. Database shutdown cannot succeed if the database
   use count is erroneously left set. */

#if (defined DEV_BUILD && !defined MULTI_THREAD)
	if (dbb && dbb->dbb_use_count && !(dbb->dbb_flags & DBB_security_db)) {
		STATUS *p;

		dbb->dbb_use_count = 0;
		p = user_status;
		*p++ = gds_arg_gds;
		*p++ = gds_random;
		*p++ = gds_arg_string;
		*p++ = (STATUS) "database use count set on error return";
		*p = gds_arg_end;
	}
#endif

	return user_status[1];
}


static void find_intl_charset(TDBB tdbb, ATT attachment, DPB * 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.
 *
 **************************************/
	SSHORT len;

	SET_TDBB(tdbb);

	if (!options->dpb_lc_ctype || (len = strlen(options->dpb_lc_ctype)) == 0) {
		/* No declaration of character set, act like 3.x Interbase */
		attachment->att_charset = DEFAULT_ATTACHMENT_CHARSET;
		return;
	}

	SSHORT id;
	STATUS local_status[ISC_STATUS_LENGTH];

	if (MET_get_char_subtype(tdbb,
							&id,
							reinterpret_cast<UCHAR*>(options->dpb_lc_ctype),
							len) &&
		INTL_defined_type(tdbb, local_status, id) &&
		(id != CS_BINARY))
	{
		attachment->att_charset = id;
	}
	else
	{
		/* Report an error - we can't do what user has requested */
		ERR_post(gds_bad_dpb_content,
				gds_arg_gds, gds_charset_not_found,
				gds_arg_string, ERR_cstring(options->dpb_lc_ctype),
				0);
	}
}


static void get_options(UCHAR*	dpb,
						USHORT	dpb_length,
						TEXT**	scratch,
					    ULONG	buf_size,
						DPB*	options)
{
/**************************************
 *
 *	g e t _ o p t i o n s
 *
 **************************************
 *
 * Functional description
 *	Parse database parameter block picking up options and things.
 *
 **************************************/
	UCHAR *p, *end_dpb, *single;
	USHORT l;
	SSHORT num_old_files = 0;

	DBB dbb = get_dbb();

	MOVE_CLEAR(options, (SLONG) sizeof(struct dpb));

	options->dpb_buffers = JRD_cache_default;
	options->dpb_sweep_interval = -1;
	options->dpb_wal_grp_cmt_wait = -1;
	options->dpb_overwrite = TRUE;
	options->dpb_sql_dialect = 99;
	invalid_client_SQL_dialect = FALSE;
	p = dpb;
	end_dpb = p + dpb_length;

	if ((dpb == NULL) && (dpb_length > 0))
		ERR_post(gds_bad_dpb_form, 0);

	if (p < end_dpb && *p++ != gds_dpb_version1)
		ERR_post(gds_bad_dpb_form, gds_arg_gds, gds_wrodpbver, 0);

	while (p < end_dpb && buf_size)
	{
		switch (*p++)
		{
		case isc_dpb_working_directory:
			{
				// CLASSIC have no thread data. Init to zero.
				char* t_data = 0;
				options->dpb_working_directory =
					get_string_parameter(&p, scratch, &buf_size);

				THD_getspecific_data((void **) &t_data);

				/*
				   Null value for working_directory implies remote database. So get
				   the users HOME directory
				 */
#ifndef WIN_NT
				if (!options->dpb_working_directory[0]) {
					struct passwd *passwd = (struct passwd *) NULL;

					if (t_data)
						passwd = getpwnam(t_data);
					if (passwd) {
						l = strlen(passwd->pw_dir) + 1;
					    if (l <= buf_size)
							strcpy(*scratch, passwd->pw_dir);
						else
						{
							**scratch = 0;
							l = buf_size;
						}
					}
					else {		/*No home dir for this users here. Default to server dir */

					    **scratch = 0;
#ifdef HAVE_GETCWD
				        if (getcwd(*scratch, MIN(MAXPATHLEN, buf_size)))
#else
				        if (getwd(*scratch))
#endif
							l = strlen(*scratch) + 1;
					    else
							l = buf_size;	
					}
					options->dpb_working_directory = *scratch;
					*scratch += l;
					buf_size -= l;
				}
#endif
				if (t_data)
				{
					free(t_data);
					t_data = NULL;
				}
				/* Null out the thread local data so that further references will fail */
				THD_putspecific_data(0);
			}
			break;

		case isc_dpb_set_page_buffers:
			options->dpb_page_buffers = get_parameter(&p);
			if (options->dpb_page_buffers &&
				(options->dpb_page_buffers < MIN_PAGE_BUFFERS ||
				 options->dpb_page_buffers > MAX_PAGE_BUFFERS))
			{
				ERR_post(gds_bad_dpb_content, 0);
			}
			options->dpb_set_page_buffers = TRUE;
			break;

		case gds_dpb_num_buffers:
			options->dpb_buffers = get_parameter(&p);
			if (options->dpb_buffers < 10)
				ERR_post(gds_bad_dpb_content, 0);
			break;

		case gds_dpb_page_size:
			options->dpb_page_size = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_debug:
			options->dpb_debug = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_sweep:
			options->dpb_sweep = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_sweep_interval:
			options->dpb_sweep_interval = get_parameter(&p);
			break;

		case gds_dpb_verify:
			options->dpb_verify = (USHORT) get_parameter(&p);
			if (options->dpb_verify & gds_dpb_ignore)
				dbb->dbb_flags |= DBB_damaged;
			break;

		case gds_dpb_trace:
			options->dpb_trace = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_damaged:
			if (get_parameter(&p) & 1)
				dbb->dbb_flags |= DBB_damaged;
			break;

		case gds_dpb_enable_journal:
		    options->dpb_journal = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_wal_backup_dir:
		    options->dpb_wal_backup_dir = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_drop_walfile:
			options->dpb_wal_action = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_old_dump_id:
			options->dpb_old_dump_id = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_online_dump:
			options->dpb_online_dump = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_old_file_size:
			options->dpb_old_file_size = get_parameter(&p);
			break;

		case gds_dpb_old_num_files:
			options->dpb_old_num_files = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_old_start_page:
			options->dpb_old_start_page = get_parameter(&p);
			break;

		case gds_dpb_old_start_seqno:
			options->dpb_old_start_seqno = get_parameter(&p);
			break;

		case gds_dpb_old_start_file:
			options->dpb_old_start_file = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_old_file:
			if (num_old_files >= MAX_OLD_FILES)
				ERR_post(gds_num_old_files, 0);

		    options->dpb_old_file [num_old_files] =
				get_string_parameter(&p, scratch, &buf_size);
			num_old_files++;
			break;

		case gds_dpb_wal_chkptlen:
			options->dpb_wal_chkpt_len = get_parameter(&p);
			break;

		case gds_dpb_wal_numbufs:
			options->dpb_wal_num_bufs = (SSHORT) get_parameter(&p);
			break;

		case gds_dpb_wal_bufsize:
			options->dpb_wal_bufsize = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_wal_grp_cmt_wait:
			options->dpb_wal_grp_cmt_wait = get_parameter(&p);
			break;

		case gds_dpb_dbkey_scope:
			options->dpb_dbkey_scope = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_sys_user_name:
		    options->dpb_sys_user_name = get_string_parameter(&p, scratch, &buf_size);
			break;

		case isc_dpb_sql_role_name:
		    options->dpb_role_name = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_user_name:
		    options->dpb_user_name = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_password:
		    options->dpb_password = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_password_enc:
		    options->dpb_password_enc = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_encrypt_key:
#ifdef ISC_DATABASE_ENCRYPTION
		    options->dpb_key = get_string_parameter(&p, scratch, &buf_size);
#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(gds_uns_ext, gds_arg_gds, gds_random,
					 gds_arg_string, "Encryption not supported", 0);
#endif
			break;

		case gds_dpb_no_garbage_collect:
			options->dpb_no_garbage = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_disable_journal:
			options->dpb_disable = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_activate_shadow:
			options->dpb_activate_shadow = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_delete_shadow:
			options->dpb_delete_shadow = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_force_write:
			options->dpb_set_force_write = TRUE;
			options->dpb_force_write = (SSHORT) get_parameter(&p);
			break;

		case gds_dpb_begin_log:
		    options->dpb_log = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_quit_log:
			options->dpb_quit_log = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_no_reserve:
			options->dpb_set_no_reserve = TRUE;
			options->dpb_no_reserve = (UCHAR) get_parameter(&p);
			break;

		case gds_dpb_interp:
			options->dpb_interp = (SSHORT) get_parameter(&p);
			break;

		case gds_dpb_lc_messages:
		    options->dpb_lc_messages = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_lc_ctype:
		    options->dpb_lc_ctype = get_string_parameter(&p, scratch, &buf_size);
			break;

		case gds_dpb_shutdown:
			options->dpb_shutdown = (USHORT) get_parameter(&p);
			break;

		case gds_dpb_shutdown_delay:
			options->dpb_shutdown_delay = (SSHORT) get_parameter(&p);
			break;

		case gds_dpb_online:
			options->dpb_online = TRUE;
			l = *p++;
			p += l;
			break;

		case isc_dpb_reserved:
			single =
				reinterpret_cast<UCHAR*>(get_string_parameter(&p, scratch, &buf_size));
		    if (single && !strcmp(reinterpret_cast < char *>(single), "YES"))
				  options->dpb_single_user = TRUE;
			break;

		case isc_dpb_overwrite:
			options->dpb_overwrite = (BOOLEAN) get_parameter(&p);
			break;

		case isc_dpb_sec_attach:
			options->dpb_sec_attach = (BOOLEAN) get_parameter(&p);
			options->dpb_buffers = 50;
			dbb->dbb_flags |= DBB_security_db;
			break;

		case isc_dpb_gbak_attach:
		    options->dpb_gbak_attach = get_string_parameter(&p, scratch, &buf_size);
			break;

		case isc_dpb_gstat_attach:
			options->dpb_gstat_attach = TRUE;
			l = *p++;
			p += l;
			break;

		case isc_dpb_gfix_attach:
			options->dpb_gfix_attach = TRUE;
			l = *p++;
			p += l;
			break;

		case isc_dpb_disable_wal:
			options->dpb_disable_wal = TRUE;
			l = *p++;
			p += l;
			break;

		case gds_dpb_connect_timeout:
			options->dpb_connect_timeout = get_parameter(&p);
			break;

		case gds_dpb_dummy_packet_interval:
			options->dpb_dummy_packet_interval = get_parameter(&p);
			break;

		case isc_dpb_sql_dialect:
			options->dpb_sql_dialect = (USHORT) get_parameter(&p);
			if (options->dpb_sql_dialect > SQL_DIALECT_V6)
					invalid_client_SQL_dialect = TRUE;
			break;

		case isc_dpb_set_db_sql_dialect:
			options->dpb_set_db_sql_dialect = (USHORT) get_parameter(&p);
			break;

		case isc_dpb_set_db_readonly:
			options->dpb_set_db_readonly = TRUE;
			options->dpb_db_readonly = (SSHORT) get_parameter(&p);
			break;

		case isc_dpb_set_db_charset:
			options->dpb_set_db_charset = get_string_parameter (&p, scratch, &buf_size);
			break;

		default:
			l = *p++;
			p += l;
		}
	}

	if (p != end_dpb)
		ERR_post(gds_bad_dpb_form, 0);

}


static SLONG get_parameter(UCHAR** ptr)
{
/**************************************
 *
 *	g e t _ p a r a m e t e r
 *
 **************************************
 *
 * Functional description
 *	Pick up a VAX format parameter from a parameter block, including the
 *	length byte.
 *
 **************************************/
	SLONG parameter;
	SSHORT l;

	l = *(*ptr)++;
	parameter = gds__vax_integer(*ptr, l);
	*ptr += l;

	return parameter;
}


static TEXT* get_string_parameter(UCHAR** dpb_ptr, TEXT** opt_ptr, ULONG* buf_avail)
{
/**************************************
 *
 *	g e t _ s t r i n g _ p a r a m e t e r
 *
 **************************************
 *
 * Functional description
 *	Pick up a string valued parameter, copy it to a running temp,
 *	and return pointer to copied string.
 *
 **************************************/
	TEXT *opt;
	UCHAR *dpb;
	USHORT l;

	if (!*buf_avail)  /* Because "l" may be zero but the NULL term still is set. */
		return 0;

	opt = *opt_ptr;
	dpb = *dpb_ptr;

	if ((l = *(dpb++)))
	{
		if (l >= *buf_avail) /* >= to count the NULL term. */
		{
			*buf_avail = 0;
			return 0;
		}
		*buf_avail -= l;
		do
			*opt++ = *dpb++;
		while (--l);
	}

	--*buf_avail;
	*opt++ = 0;
	*dpb_ptr = dpb;
	dpb = (UCHAR *) * opt_ptr;
	*opt_ptr = opt;

	return (TEXT *) dpb;
}


static STATUS handle_error(STATUS * user_status, STATUS code, TDBB tdbb)
{
/**************************************
 *
 *	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.
 *
 **************************************/
	STATUS *vector;

	if (tdbb)
		JRD_restore_context();

	vector = user_status;
	*vector++ = gds_arg_gds;
	*vector++ = code;
	*vector = gds_arg_end;

	return code;
}


#if defined (WIN_NT) && !defined(SERVER_SHUTDOWN)
static BOOLEAN handler_NT(SSHORT controlAction)
{
/**************************************
 *
 *      h a n d l e r _ N T
 *
 **************************************
 *
 * Functional description
 *	For some actions, get NT to issue a popup asking
 *	the user to delay.
 *
 **************************************/

	switch (controlAction) {
	case CTRL_CLOSE_EVENT:
	case CTRL_LOGOFF_EVENT:
	case CTRL_SHUTDOWN_EVENT:
		return TRUE;			/* NT will issue popup */

	case CTRL_C_EVENT:
	case CTRL_BREAK_EVENT:
		return FALSE;			/* let it go */
	}
/* So, what are we to return here?! */
	return FALSE;				/* let it go */
}
#endif


static DBB init(TDBB	tdbb,
				STATUS*	user_status,
				TEXT*	expanded_filename,
				USHORT	attach_flag)
{
/**************************************
 *
 *	i n i t
 *
 **************************************
 *
 * Functional description
 *	Initialize for database access.  First call from both CREATE and
 *	OPEN.
 *
 **************************************/
	DBB dbb_;
	STR string;
	VEC vector;
	MUTX_T temp_mutx[DBB_MUTX_max];
	WLCK_T temp_wlck[DBB_WLCK_max];

	SET_TDBB(tdbb);

/* If this is the first time through, initialize local mutexes and set
   up a cleanup handler.  Regardless, then lock the database mutex. */

	if (!initialized) {
		THD_INIT;
		THREAD_EXIT;
		THD_GLOBAL_MUTEX_LOCK;
		THREAD_ENTER;
		PluginManager::load_engine_plugins();
		if (!initialized) {
#if defined(V4_THREADING) && !defined(SUPERSERVER)
			V4_MUTEX_INIT(databases_mutex);
#endif
			JRD_SS_INIT_MUTEX;
			gds__register_cleanup(cleanup, 0);
			initialized = TRUE;
			JRD_cache_default = Config::getDefaultDbCachePages();
			if (JRD_cache_default < MIN_PAGE_BUFFERS)
				JRD_cache_default = MIN_PAGE_BUFFERS;
			if (JRD_cache_default > MAX_PAGE_BUFFERS)
				JRD_cache_default = MAX_PAGE_BUFFERS;
#if defined (WIN_NT) && !defined(SERVER_SHUTDOWN)
			setup_NT_handlers();
#endif
		}
		THD_GLOBAL_MUTEX_UNLOCK;
	}

	JRD_SS_MUTEX_LOCK;
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_LOCK(databases_mutex);
#endif

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

	for (dbb_ = databases; dbb_; dbb_ = dbb_->dbb_next)
	{
		if (!(dbb_->dbb_flags & (DBB_bugcheck | DBB_not_in_use)) &&
#ifndef SUPERSERVER
			!(dbb_->dbb_ast_flags & DBB_shutdown &&
			  dbb_->dbb_ast_flags & DBB_shutdown_locks) &&
#endif
			(string = dbb_->dbb_filename) &&
			!strcmp(reinterpret_cast<char*>(string->str_data),
					expanded_filename))
		{
			return (attach_flag) ? dbb_ : NULL;
		}
	}

/* Clean up temporary DBB */

	/* MOVE_CLEAR(&temp, (SLONG) sizeof(struct dbb)); */
	THD_MUTEX_INIT_N(temp_mutx, DBB_MUTX_max);
#ifdef V4_THREADING
	V4_RW_LOCK_INIT_N(temp_wlck, DBB_WLCK_max);
#endif

/* set up the temporary database block with fields that are
   required for doing the ALL_init() */

	tdbb->tdbb_status_vector = user_status;
	tdbb->tdbb_database = 0;

	try {
#ifdef SUPERSERVER
	int cur_perm = 0, max_perm = 0;
	JrdMemoryPool* perm = JrdMemoryPool::createPool(&cur_perm, &max_perm);
	dbb_ = dbb::newDbb(*perm);
	perm->moveStats((int*)&dbb_->dbb_current_memory, (int*)&dbb_->dbb_max_memory);
#else
	JrdMemoryPool* perm = JrdMemoryPool::createPool();
	dbb_ = dbb::newDbb(*perm);
#endif
	//temp.blk_type = type_dbb;
	dbb_->dbb_permanent = perm;
	dbb_->dbb_mutexes = temp_mutx;
	dbb_->dbb_rw_locks = temp_wlck;
	tdbb->tdbb_database = dbb_;

	ALL_init();

	THD_MUTEX_DESTROY_N(temp_mutx, DBB_MUTX_max);
#ifdef V4_THREADING
	V4_RW_LOCK_DESTROY_N(temp_wlck, DBB_WLCK_max);
#endif

	dbb_->dbb_next = databases;
	databases = dbb_;

	string =
		FB_NEW_RPT(*dbb_->dbb_permanent, THREAD_STRUCT_SIZE(MUTX_T, DBB_MUTX_max)) str();

	dbb_->dbb_mutexes = (MUTX) THREAD_STRUCT_ALIGN(string->str_data);
	THD_MUTEX_INIT_N(dbb_->dbb_mutexes, DBB_MUTX_max);
	string =
		FB_NEW_RPT(*dbb_->dbb_permanent, THREAD_STRUCT_SIZE(WLCK_T, DBB_WLCK_max)) str();
	dbb_->dbb_rw_locks = (WLCK) THREAD_STRUCT_ALIGN(string->str_data);
#ifdef V4_THREADING
	V4_RW_LOCK_INIT_N(dbb_->dbb_rw_locks, DBB_WLCK_max);
#endif
	dbb_->dbb_internal = vector = vec::newVector(*dbb_->dbb_permanent, irq_MAX);
	dbb_->dbb_dyn_req = vector = vec::newVector(*dbb_->dbb_permanent, drq_MAX);
	dbb_->dbb_flags |= DBB_exclusive;
	dbb_->dbb_sweep_interval = SWEEP_INTERVAL;

/* Initialize a number of subsystems */

	TRA_init(tdbb);

/* Lookup some external "hooks" */

	PluginManager::Plugin crypt_lib =
		PluginManager::getEnginePluginManager().findPlugin(CRYPT_IMAGE);
	if (crypt_lib) {
		Firebird::string encrypt_entrypoint(ENCRYPT);
		Firebird::string decrypt_entrypoint(DECRYPT);
		dbb_->dbb_encrypt =
			(dbb::crypt_routine) crypt_lib.lookupSymbol(encrypt_entrypoint);
		dbb_->dbb_decrypt =
			(dbb::crypt_routine) crypt_lib.lookupSymbol(decrypt_entrypoint);
	}

	INTL_init(tdbb);

	SecurityDatabase::initialize();

	return dbb_;

	}	// try
	catch (const std::exception&) {
		return 0;
	}
}


static void make_jrn_data(UCHAR*	data,
						  USHORT*	ret_len,
						  TEXT*		db_name,
						  USHORT	db_len,
						  TEXT*		backup_dir,
						  USHORT	b_length)
{
/**************************************
 *
 *	m a k e _ j r n _ d a t a
 *
 **************************************
 *
 * Functional description
 *	Encode the database and backup information into a string.
 *	Returns the length of the string.
 *
 **************************************/
	int		len = b_length;
	UCHAR*	t   = data;

	if (len) {
		*t++ = gds_dpb_wal_backup_dir;
		*t++ = (UCHAR) b_length;
		const UCHAR* q = reinterpret_cast<UCHAR*>(backup_dir);
		do {
			*t++ = *q++;
		} while (--len);
	}

	if ( (len = db_len) ) {
		*t++ = JRNW_DB_NAME;
		*t++ = (UCHAR) db_len;
		const UCHAR* q = reinterpret_cast<UCHAR*>(db_name);
		do {
			*t++ = *q++;
		} while (--len);
	}
	*t++ = JRNW_END;

	*ret_len = t - data;
}


static STATUS prepare(TDBB		tdbb,
					  JRD_TRA		transaction,
					  STATUS*	status_vector,
					  USHORT	length,
					  UCHAR*	msg)
{
/**************************************
 *
 *	p r e p a r e
 *
 **************************************
 *
 * Functional description
 *	Attempt to prepare a transaction.  If it fails at any point, return
 *	an error.
 *
 **************************************/
	DBB dbb;

	SET_TDBB(tdbb);

	try {

	for (; transaction; transaction = transaction->tra_sibling) {
		check_database(tdbb, transaction->tra_attachment, status_vector);
		tdbb->tdbb_status_vector = status_vector;
		TRA_prepare(tdbb, transaction, length, msg);
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
	}

	}	// try
	catch (const std::exception&) {
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;
		return status_vector[1];
	}

	return FB_SUCCESS;
}


static void release_attachment(ATT 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.
 *	NOTE:  This routine assumes that upon entry,
 *	mutex DBB_MUTX_init_fini will be locked.
 *	Before exiting, there is a handoff from this
 *	mutex to the databases_mutex mutex.  Upon exit,
 *	that mutex remains locked.  It is the
 *	responsibility of the caller to unlock it.
 *
 **************************************/
	ATT *ptr;
	VCL *vector;
	VEC lock_vector;
	LCK record_lock;
	vec::iterator lock;
	USHORT i;

	TDBB tdbb = get_thread_data();
	DBB  dbb  = tdbb->tdbb_database;
	CHECK_DBB(dbb);

	if (!attachment) {
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
		V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
		V4_JRD_MUTEX_LOCK(databases_mutex);
#endif
		return;
	}

	if (attachment->att_event_session)
		EVENT_delete_session(attachment->att_event_session);

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

	for (vector = attachment->att_counts;
		 vector < attachment->att_counts + DBB_max_count; ++vector)
		if (*vector)
			delete *vector;

	if (attachment->att_working_directory)
		delete attachment->att_working_directory;

	if (attachment->att_lc_messages)
		delete attachment->att_lc_messages;

/* Release any validation error vector allocated */

	if (attachment->att_val_errors) {
		delete attachment->att_val_errors;
		attachment->att_val_errors = (VCL) 0;
	}

/* Release the persistent locks taken out during the attachment */

	if ( (lock_vector = attachment->att_relation_locks) )
	{
		for (i = 0, lock = lock_vector->begin();
			 i < lock_vector->count(); i++, lock++)
		{
			if (*lock)
			{
				LCK_release(tdbb, (LCK)(*lock));
				delete *lock;
			}
		}
		delete lock_vector;
	}

	for (record_lock = attachment->att_record_locks; record_lock;
		 record_lock = record_lock->lck_att_next)
	{
		LCK_release(tdbb, record_lock);
	}

/* bug #7781, need to null out the attachment pointer of all locks which
   were hung off this attachment block, to ensure that the attachment
   block doesn't get dereferenced after it is released */

	for (record_lock = attachment->att_long_locks; record_lock;
		 record_lock = record_lock->lck_next)
	{
		record_lock->lck_attachment = NULL;
	}

	if (attachment->att_flags & ATT_lck_init_done)
		LCK_fini(tdbb, LCK_OWNER_attachment);	/* For the attachment */

	if (attachment->att_compatibility_table)
		delete attachment->att_compatibility_table;

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
	V4_JRD_MUTEX_UNLOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
	V4_JRD_MUTEX_LOCK(databases_mutex);
#endif

	if (MemoryPool::blk_type(dbb) != type_dbb)
		return;

/* remove the attachment block from the dbb linked list */

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


static STATUS return_success(TDBB tdbb)
{
/**************************************
 *
 *	r e t u r n _ s u c c e s s
 *
 **************************************
 *
 * Functional description
 *	Set up status vector to reflect successful execution.
 *
 **************************************/
	DBB dbb;
	STATUS *p, *user_status;

	SET_TDBB(tdbb);

/* Decrement count of active threads in database */

	if ( (dbb = tdbb->tdbb_database) )
		--dbb->dbb_use_count;

	p = user_status = tdbb->tdbb_status_vector;

/* If the status vector has not been initialized, then
   initilalize the status vector to indicate success.
   Else pass the status vector along at it stands.  */
	if (p[0] != gds_arg_gds ||
		p[1] != FB_SUCCESS ||
		(p[2] != gds_arg_end && p[2] != gds_arg_gds &&
		 p[2] != isc_arg_warning))
	{
		*p++ = gds_arg_gds;
		*p++ = FB_SUCCESS;
		*p = gds_arg_end;
	}

	JRD_restore_context();

/* This is debugging code which is meant to verify that
   the database use count is cleared on exit from the
   engine. Database shutdown cannot succeed if the database
   use count is erroneously left set. */

#if (defined DEV_BUILD && !defined MULTI_THREAD)
	if (dbb && dbb->dbb_use_count && !(dbb->dbb_flags & DBB_security_db)) {
		dbb->dbb_use_count = 0;
		p = user_status;
		*p++ = gds_arg_gds;
		*p++ = gds_random;
		*p++ = gds_arg_string;
		*p++ = (STATUS) "database use count set on success return";
		*p = gds_arg_end;
	}
#endif

	return user_status[1];
}


static BOOLEAN rollback(TDBB	tdbb,
						JRD_TRA		next,
						STATUS*	status_vector,
						USHORT	retaining_flag)
{
/**************************************
 *
 *	r o l l b a c k
 *
 **************************************
 *
 * Functional description
 *	Abort a transaction.
 *
 **************************************/
	DBB dbb;
	JRD_TRA transaction;
	STATUS local_status[ISC_STATUS_LENGTH];

	SET_TDBB(tdbb);

	while ( (transaction = next) )
	{
		next = transaction->tra_sibling;
		check_database(tdbb, transaction->tra_attachment, status_vector);

		try {
		tdbb->tdbb_status_vector = status_vector;
		TRA_rollback(tdbb, transaction, retaining_flag);
		dbb = tdbb->tdbb_database;
		--dbb->dbb_use_count;

		}	// try
		catch (const std::exception&) {
			status_vector = local_status;
			dbb = tdbb->tdbb_database;
			--dbb->dbb_use_count;
			continue;
		}
	}

	return (status_vector == local_status);
}


#if defined (WIN_NT) && !defined(SERVER_SHUTDOWN)
static void setup_NT_handlers()
{
/**************************************
 *
 *      s e t u p _ N T _ h a n d l e r s
 *
 **************************************
 *
 * Functional description
 *      Set up Windows NT console control handlers for
 *      things that can happen.   The handler used for
 *      all cases, handler_NT(), will flush and close
 *      any open database files.
 *
 **************************************/

	(void) SetConsoleCtrlHandler((PHANDLER_ROUTINE) handler_NT, TRUE);
}
#endif


static void shutdown_database(DBB dbb, BOOLEAN 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.
 *
 **************************************/
	TDBB tdbb = 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

#ifdef GARBAGE_THREAD
	VIO_fini(tdbb);
#endif
	CMP_fini(tdbb);
	CCH_fini(tdbb);
	FUN_fini(tdbb);

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

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

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

	if (dbb->dbb_wal)
		AIL_fini();

	if (dbb->dbb_journal)
		JRN_fini(tdbb->tdbb_status_vector, &dbb->dbb_journal);

#ifdef REPLAY_OSRI_API_CALLS_SUBSYSTEM
	if (dbb->dbb_log)
		LOG_fini();
#endif

/* Shut down any extern relations */

	if (dbb->dbb_relations)
	{
		VEC vector = dbb->dbb_relations;
		vec::iterator ptr = vector->begin(), end = vector->end();

		for (; ptr < end; ++ptr)
		{
			if (*ptr && ((JRD_REL)(*ptr))->rel_file)
			{
				EXT_fini((JRD_REL)(*ptr));
			}
		}
	}

	DBB* 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) {
		LCK_fini(tdbb, LCK_OWNER_database);	/* For the database */
		dbb->dbb_flags &= ~DBB_lck_init_done;
	}

/* Remove objects from the in-use strutures before destroying them */

	USHORT i;
	for (i = 0; i < DBB_MUTX_max; i++) {
		INUSE_remove(&tdbb->tdbb_mutexes, dbb->dbb_mutexes + i, TRUE);
	}
	for (i = 0; i < DBB_WLCK_max; i++) {
		INUSE_remove(&tdbb->tdbb_rw_locks, dbb->dbb_rw_locks + i, TRUE);
	}

	THD_MUTEX_DESTROY_N(dbb->dbb_mutexes, DBB_MUTX_max);
#ifdef V4_THREADING
	V4_RW_LOCK_DESTROY_N(dbb->dbb_rw_locks, DBB_WLCK_max);
#endif
#ifdef SUPERSERVER
	if (dbb->dbb_flags & DBB_sp_rec_mutex_init) {
		THD_rec_mutex_destroy(&dbb->dbb_sp_rec_mutex);
	}
#endif
	if (release_pools) {
		dbb::deleteDbb(dbb);
		tdbb->tdbb_database = NULL;
	}

	SecurityDatabase::shutdown();
}


static void strip_quotes(TEXT * in, TEXT * out)
{
/**************************************
 *
 *	s t r i p _ q u o t e s
 *
 **************************************
 *
 * Functional description
 *	Get rid of quotes around strings
 *
 **************************************/
	TEXT *p;
	TEXT quote;

	if (!in || !*in) {
		*out = 0;
		return;
	}

	quote = 0;
/* Skip any initial quote */
	if ((*in == DBL_QUOTE) || (*in == SINGLE_QUOTE))
		quote = *in++;
	p = in;

/* Now copy characters until we see the same quote or EOS */
	while (*p && (*p != quote)) {
		*out++ = *p++;
	}
	*out = 0;
}


void JRD_set_cache_default(ULONG * num_ptr)
{
/**************************************
 *
 *	J R D _ s e t _ c a c h e _ d e f a u l t
 *
 **************************************
 *
 * Functional description
 *	Set the number of cache pages to use for each
 *	database, but don't go less than MIN_PAGE_BUFFERS and
 *      more than MAX_PAGE_BUFFERS.
 *	Currently MIN_PAGE_BUFFERS = 50L,
 *		  MAX_PAGE_BUFFERS = 65535L.
 *
 **************************************/

	if (*num_ptr < MIN_PAGE_BUFFERS)
		*num_ptr = MIN_PAGE_BUFFERS;
	if (*num_ptr > MAX_PAGE_BUFFERS)
		*num_ptr = MAX_PAGE_BUFFERS;
	JRD_cache_default = *num_ptr;
}


#ifdef SERVER_SHUTDOWN
TEXT *JRD_num_attachments(TEXT * buf, USHORT len, USHORT flag, USHORT * atts,
						  USHORT * dbs)
{
/**************************************
 *
 *	J R D _ n u m _ a t t a c h m e n t s
 *
 **************************************
 *
 * Functional description
 *	Count the number of active databases and
 *	attachments.  If flag is set then put
 *	what it says into buf, if it fits. If it does not fit
 *	then allocate local buffer, put info into there, and
 *	return pointer to caller (in this case a caller must
 *	release memory allocated for local buffer).
 *
 **************************************/
	USHORT num_dbs = 0;
	USHORT num_att = 0;
	USHORT total = 0;
	ULONG drive_mask = 0L;
	DBB dbb;
	DBF dbf = NULL, dbfp = NULL;
	ATT att;
	TEXT *lbuf, *lbufp;

/* protect against NULL value for buf */

	if (!(lbuf = buf))
		len = 0;

#ifdef WIN_NT
/* Check that the buffer is big enough for the requested
 * information.  If not, unset the flag
 */

	if (flag == JRD_info_drivemask)
		if (len < sizeof(ULONG))
			if (!(lbuf = (TEXT *) gds__alloc((SLONG) (sizeof(ULONG)))))
				flag = 0;
#endif

	THREAD_ENTER;

/* 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 (dbb = databases; dbb; dbb = dbb->dbb_next) {
#ifdef WIN_NT
		struct fil *files;
		struct dls *dirs;
		struct scb *scb;
		struct sfb *sfb;

		/* Get drive letters for db files */

		if (flag == JRD_info_drivemask)
			for (files = dbb->dbb_file; files; files = files->fil_next)
				ExtractDriveLetter(files->fil_string, &drive_mask);
#endif

		if (!(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use | DBB_security_db)) &&
			!(dbb->dbb_ast_flags & DBB_shutdown
			  && dbb->dbb_ast_flags & DBB_shutdown_locks)) {
			num_dbs++;
			if (flag == JRD_info_dbnames) {
				if (dbfp == NULL) {
					dbfp = (DBF) gds__alloc((SLONG) (sizeof(struct dbf) +
													 sizeof(TEXT) *
													 dbb->
													 dbb_filename->str_length));
					dbf = dbfp;
				}
				else {
					dbfp->dbf_next = (DBF)
						gds__alloc((SLONG)
								   (sizeof(struct dbf) +
									sizeof(TEXT) *
									dbb->dbb_filename->str_length));
					dbfp = dbfp->dbf_next;
				}
				if (dbfp) {
					dbfp->dbf_length = dbb->dbb_filename->str_length;
					dbfp->dbf_next = NULL;
					MOVE_FAST(dbb->dbb_filename->str_data, dbfp->dbf_data,
							  dbfp->dbf_length);
					total += sizeof(USHORT) + dbfp->dbf_length;
				}
				else
					flag = 0;
			}

			for (att = dbb->dbb_attachments; att; att = att->att_next) {
				num_att++;

#ifdef WIN_NT
				/* Get drive letters for temp directories */

				if (flag == JRD_info_drivemask) {
					MDLS* ptr = DLS_get_access();
					for (dirs = ptr->mdls_dls; dirs; dirs = dirs->dls_next) {
						ExtractDriveLetter(dirs->dls_directory, &drive_mask);
					}
				}

				/* Get drive letters for sort files */

				if (flag == JRD_info_drivemask)
				{
					for (scb = att->att_active_sorts; scb; scb = scb->scb_next)
					{
						for (sfb = scb->scb_sfb; sfb; sfb = sfb->sfb_next)
						{
							ExtractDriveLetter(sfb->sfb_file_name, &drive_mask);
						}
					}
				}
#endif
			}
		}
	}

	THREAD_EXIT;

	*atts = num_att;
	*dbs = num_dbs;

	if (dbf)
	{
		if (flag == JRD_info_dbnames)
		{
			if (len < (sizeof(USHORT) + total))
			{
				lbuf = (TEXT *) gds__alloc((SLONG) (sizeof(USHORT) + total));
			}
			if (lbufp = lbuf)
			{
				/*  Put db info into buffer. Format is as follows:

				   number of dbases sizeof (USHORT)
				   1st db name length   sizeof (USHORT)
				   1st db name      sizeof (TEXT) * length
				   2nd db name length
				   2nd db name
				   ...
				   last db name length
				   last db name
				 */

				lbufp += sizeof(USHORT);
				total = 0;
				for (dbfp = dbf; dbfp; dbfp = dbfp->dbf_next) {
					*lbufp++ = (TEXT) dbfp->dbf_length;
					*lbufp++ = dbfp->dbf_length >> 8;
					MOVE_FAST(dbfp->dbf_data, lbufp, dbfp->dbf_length);
					lbufp += dbfp->dbf_length;
					total++;
				}
				assert(total == num_dbs);
				lbufp = lbuf;
				*lbufp++ = (TEXT) total;
				*lbufp++ = total >> 8;
			}
		}

		for (dbfp = dbf; dbfp;) {
			DBF x = dbfp->dbf_next;
			gds__free(dbfp);
			dbfp = x;
		}
	}

#ifdef WIN_NT
	if (flag == JRD_info_drivemask)
		*(ULONG *) lbuf = drive_mask;
#endif

	if (num_dbs == 0)
		lbuf = NULL;

	return lbuf;
}


#ifdef WIN_NT
static void ExtractDriveLetter(TEXT* file_name, ULONG* drive_mask)
{
/**************************************
 *
 *	E x t r a c t D r i v e L e t t e r
 *
 **************************************
 *
 * Functional description
 *	Determine the drive letter of file_name
 *	and set the proper bit in the bit mask.
 *		bit 0 = drive A
 *		bit 1 = drive B and so on...
 *	This function is used to determine drive
 *	usage for use with Plug and Play for
 *	MS Windows 4.0.
 *
 **************************************/
	ULONG mask = 1;
	SHORT shift;

	shift = (*file_name - 'A');
	mask <<= shift;
	*drive_mask |= mask;
}
#endif


ULONG JRD_shutdown_all()
{
/**************************************
 *
 *	J R D _ s h u t d o w n _ a l l
 *
 **************************************
 *
 * Functional description
 *	rollback every transaction,
 *	release every attachment,
 *	and shutdown every database.
 *
 **************************************/
	STATUS user_status[ISC_STATUS_LENGTH];
	ATT att, att_next;
	DBB dbb, dbb_next;
	struct tdbb thd_context;

	struct tdbb* tdbb = set_thread_data(thd_context);

	if (initialized)
		JRD_SS_MUTEX_LOCK;

	for (dbb = databases; dbb; dbb = dbb_next)
	{
		dbb_next = dbb->dbb_next;
		if (!(dbb->dbb_flags & (DBB_bugcheck | DBB_not_in_use | DBB_security_db)) &&
			!(dbb->dbb_ast_flags & DBB_shutdown &&
			  dbb->dbb_ast_flags & DBB_shutdown_locks))
		{
			for (att = dbb->dbb_attachments; att; att = att_next)
			{
				att_next = att->att_next;
				tdbb->tdbb_database = dbb;
				tdbb->tdbb_attachment = att;
				tdbb->tdbb_request = NULL;
				tdbb->tdbb_transaction = NULL;
				tdbb->tdbb_default = NULL;

				++dbb->dbb_use_count;

				/* purge_attachment below can do an ERR_post */

				tdbb->tdbb_status_vector = user_status;

				try {
					/* purge_attachment, rollback any open transactions */

#if defined(V4_THREADING) && !defined(SUPERSERVER) 
					V4_JRD_MUTEX_LOCK(dbb->dbb_mutexes + DBB_MUTX_init_fini);
#endif
					purge_attachment(tdbb, user_status, att, TRUE);
#if defined(V4_THREADING) && !defined(SUPERSERVER) 
					V4_JRD_MUTEX_UNLOCK(databases_mutex);
#endif
				}	// try
				catch (const std::exception&) {
					if (initialized) {
						JRD_SS_MUTEX_UNLOCK;
					}
					return error(user_status);
				}
			}
		}
	}

	if (initialized)
		JRD_SS_MUTEX_UNLOCK;

	JRD_restore_context();

	return FB_SUCCESS;
}
#endif /* SERVER_SHUTDOWN */


static void purge_attachment(TDBB		tdbb,
							 STATUS*	user_status,
							 ATT		attachment,
							 BOOLEAN	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.
 *
 **************************************/
	BKM bookmark;
	DBB dbb;
	JRD_REQ request;
	SCL class_;
	JRD_TRA transaction, next;
	USR user;
	USHORT count;

	SET_TDBB(tdbb);
	dbb = attachment->att_database;

	if (!(dbb->dbb_flags & DBB_bugcheck)) {
		/* Check for any pending transactions */

		count = 0;

		for (transaction = attachment->att_transactions;
			 transaction;
			 transaction = next)
		{
			next = transaction->tra_next;
			if (transaction != attachment->att_dbkey_trans)
			{
				if (transaction->tra_flags & TRA_prepared ||
					dbb->dbb_ast_flags & DBB_shutdown ||
					attachment->att_flags & ATT_shutdown)
				{
					TRA_release_transaction(tdbb, transaction);
				}
				else if (force_flag)
					TRA_rollback(tdbb, transaction, FALSE);
				else
					++count;
			}
		}

		if (count)
			ERR_post(gds_open_trans, gds_arg_number, (SLONG) count, 0);

		/* If there's a side transaction for db-key scope, get rid of it */

		if ( (transaction = attachment->att_dbkey_trans) )
		{
			attachment->att_dbkey_trans = NULL;
			if (dbb->dbb_ast_flags & DBB_shutdown ||
				attachment->att_flags & ATT_shutdown)
			{
				TRA_release_transaction(tdbb, transaction);
			}
			else
			{
				TRA_commit(tdbb, transaction, FALSE);
			}
		}

		SORT_shutdown(attachment);
	}

/* Unlink attachment from database */

	release_attachment(attachment);

/* At this point, mutex dbb->dbb_mutexes [DBB_MUTX_init_fini] has been
   unlocked and mutex databases_mutex has been locked. */

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

	if (MemoryPool::blk_type(dbb) == type_dbb)
	{
		if (dbb->dbb_attachments || (dbb->dbb_flags & DBB_being_opened))
		{
			/* There are still attachments so do a partial shutdown */

			while ( (request = attachment->att_requests) ) {
				CMP_release(tdbb, request);
			}
			while ( (class_ = attachment->att_security_classes) ) {
				SCL_release(class_);
			}
			if ( (user = attachment->att_user) ) {
				delete user;
			}
			while ( (bookmark = attachment->att_bookmarks) ) {
				attachment->att_bookmarks = bookmark->bkm_next;
				delete bookmark;
			}
			if (attachment->att_bkm_quick_ref) {
				delete attachment->att_bkm_quick_ref;
			}
			if (attachment->att_lck_quick_ref) {
				delete attachment->att_lck_quick_ref;
			}

			delete attachment;
		}
		else
		{
			shutdown_database(dbb, TRUE);
		}
	}
}

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

    @param name
    @param status

 **/
static bool verify_database_name(TEXT *name, STATUS *status)
{
	// Check for security.fdb
	static TEXT SecurityNameBuffer[MAXPATHLEN] = "";
	if (! SecurityNameBuffer[0]) {
//		char TempBuffer[MAXPATHLEN];
		SecurityDatabase::getPath(SecurityNameBuffer);
//		ISC_expand_filename(TempBuffer, 0, SecurityNameBuffer);
	}
	if (strcmp(SecurityNameBuffer, name) == 0)
		return true;
	
	// Check for .conf
	if (!ISC_verify_databases_dirs(name)) {
		static TEXT *tempdiag = "DatabasesDirs - access denied";
		status[0] = gds_arg_gds;
		status[1] = gds_io_error;
		status[2] = gds_arg_string;
		status[3] = reinterpret_cast <long> (tempdiag);
		status[4] = gds_arg_string;
		status[5] = reinterpret_cast <long> (tempdiag);
		status[6] = gds_arg_end;
		return false;
	}
	return true;
}

} // extern "C"