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78 lines
1.6 KiB
C++
78 lines
1.6 KiB
C++
/*
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* mod_loader.cpp
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*
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*/
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#include "../jrd/os/mod_loader.h"
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#include "../../common.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dlfcn.h>
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/// This is the POSIX (dlopen) implementation of the mod_loader abstraction.
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class DlfcnModule : public ModuleLoader::Module
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{
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public:
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DlfcnModule(void *m) : module(m) {}
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~DlfcnModule();
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void *findSymbol(const Firebird::string&);
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private:
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void *module;
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};
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bool ModuleLoader::isLoadableModule(const Firebird::PathName& module)
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{
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struct stat sb;
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if (-1 == stat(module.c_str(), &sb))
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return false;
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if ( ! (sb.st_mode & S_IFREG) ) // Make sure it is a plain file
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return false;
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if ( -1 == access(module.c_str(), R_OK | X_OK))
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return false;
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return true;
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}
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void ModuleLoader::doctorModuleExtention(Firebird::PathName& name)
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{
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Firebird::PathName::size_type pos = name.rfind(".so");
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if (pos != Firebird::PathName::npos && pos == name.length() - 3)
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return; // No doctoring necessary
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name += ".so";
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}
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ModuleLoader::Module *ModuleLoader::loadModule(const Firebird::PathName& modPath)
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{
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void *module;
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module = dlopen(modPath.c_str(), RTLD_LAZY);
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if (module == NULL)
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return 0;
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return FB_NEW(*getDefaultMemoryPool()) DlfcnModule(module);
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}
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DlfcnModule::~DlfcnModule()
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{
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if (module)
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dlclose(module);
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}
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void *DlfcnModule::findSymbol(const Firebird::string& symName)
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{
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void *result;
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result = dlsym(module, symName.c_str());
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if (result == NULL)
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{
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Firebird::string newSym = '_' + symName;
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result = dlsym(module, newSym.c_str());
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}
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return result;
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}
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