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|
/*****************************************************************
|
| Neptune - Dynamic Libraries :: Posix Implementation
|
| (c) 2001-2008 Gilles Boccon-Gibod
| Author: Gilles Boccon-Gibod (bok@bok.net)
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "NptLogging.h"
#include "NptDynamicLibraries.h"
#include <dlfcn.h>
#ifndef RTLD_LOCAL
#define RTLD_LOCAL 0
#endif
/*----------------------------------------------------------------------
| logging
+---------------------------------------------------------------------*/
NPT_SET_LOCAL_LOGGER("neptune.posix.dynamic-libraries")
/*----------------------------------------------------------------------
| NPT_PosixDynamicLibrary
+---------------------------------------------------------------------*/
class NPT_PosixDynamicLibrary : public NPT_DynamicLibraryInterface
{
public:
// constructor and destructor
NPT_PosixDynamicLibrary(void* library, const char* name) :
m_Library(library), m_Name(name) {}
// NPT_DynamicLibraryInterface methods
virtual NPT_Result FindSymbol(const char* name, void*& symbol);
virtual NPT_Result Unload();
private:
// members
void* m_Library;
NPT_String m_Name;
};
/*----------------------------------------------------------------------
| NPT_DynamicLibrary::Load
+---------------------------------------------------------------------*/
NPT_Result
NPT_DynamicLibrary::Load(const char* name, NPT_Flags flags, NPT_DynamicLibrary*& library)
{
if (name == NULL) return NPT_ERROR_INVALID_PARAMETERS;
// default return value
library = NULL;
// compute the mode
int mode = RTLD_LOCAL;
if (flags & NPT_DYANMIC_LIBRARY_LOAD_FLAG_NOW) {
mode |= RTLD_NOW;
} else {
mode |= RTLD_LAZY;
}
// load the lib
NPT_LOG_FINE_3("loading library %s, flags=%x, mode=%x", name, flags, mode);
void* handle = dlopen(name, mode);
if (handle == NULL) {
#if defined(NPT_CONFIG_ENABLE_LOGGING)
const char* error = dlerror();
NPT_LOG_FINE_1("library cannot be loaded (%s)", error?error:"");
#endif
return NPT_FAILURE;
}
// instantiate the object
NPT_LOG_FINE_1("library %s loaded", name);
library = new NPT_DynamicLibrary(new NPT_PosixDynamicLibrary(handle, name));
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| NPT_PosixDynamicLibrary::FindSymbol
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixDynamicLibrary::FindSymbol(const char* name, void*& symbol)
{
if (name == NULL) return NPT_ERROR_INVALID_PARAMETERS;
symbol = NULL;
if (m_Library == NULL) return NPT_ERROR_NO_SUCH_ITEM;
NPT_LOG_FINE_1("finding symbol %s", name);
symbol = dlsym(m_Library, name);
return symbol?NPT_SUCCESS:NPT_ERROR_NO_SUCH_ITEM;
}
/*----------------------------------------------------------------------
| NPT_PosixDynamicLibrary::Unload
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixDynamicLibrary::Unload()
{
NPT_LOG_FINE_1("unloading library %s", (const char*)m_Name);
int result = dlclose(m_Library);
if (result == 0) {
return NPT_SUCCESS;
} else {
return NPT_FAILURE;
}
}
|
