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/*
Copyright (C) 2008 Andreas Baumann <abaumann@yahoo.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "library/loader.h"
#include "errors.h"
#include "port/sys_internal.h"
#include "port/stdlib.h" /* for malloc, free */
#include "port/stdio.h" /* for snprintf */
#include "port/string.h" /* for strncpy */
#include "i18n/gettext.h" /* for i18n */
/* check for type of dynamic loading interface */
#if !defined _WIN32
#if !defined HAVE_DLFCN
#error Unkown dynamic loading interface on this platform, port first.
#endif
#endif
#if defined HAVE_DLFCN
#include <dlfcn.h> /* for dlopen. dlclose functions */
#if defined NEEDS_LINK_H
//#include <link.h>
#endif
#endif
#if defined _WIN32
#define WIN32_MEAN_AND_LEAN
#include <windows.h>
#endif
#define INTERNAL_ERRBUF_SIZE 256
struct wolf_library_t {
#if defined HAVE_DLFCN
void *handle; /**< the OS handle for a library */
#endif
#if defined _WIN32
HMODULE handle; /**< the windows handle for a library */
#endif
char errbuf[INTERNAL_ERRBUF_SIZE]; /**< internal buffer to hold the error message
* we get with dlerror */
};
wolf_library_p wolf_library_load( const char *name, wolf_error_t *error ) {
wolf_library_p l;
int flags = 0;
l = (struct wolf_library_t *)malloc( sizeof ( struct wolf_library_t ) );
if( l == NULL ) {
*error = WOLF_ERR_OUT_OF_MEMORY;
return NULL;
}
#if defined HAVE_DLFCN
/* TODO: Apache has a flags variable and a direct parameter version, find out why..
* also make up our mind how many flags we should "leak" to the application layer
*/
flags = RTLD_NOW | RTLD_LOCAL;
l->handle = dlopen( name, flags );
if( l->handle == NULL ) {
strncpy( l->errbuf, dlerror( ), INTERNAL_ERRBUF_SIZE );
*error = WOLF_ERR_INTERNAL;
return l;
}
#endif /* defined HAVE_DLFCN */
#if defined _WIN32
l->handle = LoadLibrary( name );
if( l->handle == NULL ) {
wolf_system_error_msg( l->errbuf, INTERNAL_ERRBUF_SIZE );
*error = WOLF_ERR_INTERNAL;
return l;
}
#endif /* defined _WIN32 */
*error = WOLF_OK;
return l;
}
wolf_error_t wolf_library_unload( wolf_library_p l ) {
#if !defined _WIN32
int res = 0;
#else
BOOL res = FALSE;
#endif
if( l == NULL ) {
return WOLF_OK;
}
if( l->handle == NULL ) {
return WOLF_ERR_INVALID_STATE;
}
#if defined HAVE_DLFCN
res = dlclose( l->handle );
if( res != 0 ) {
strncpy( l->errbuf, dlerror( ), INTERNAL_ERRBUF_SIZE );
return WOLF_ERR_INTERNAL;
}
#endif /* defined HAVE_DLFCN */
#if defined _WIN32
res = FreeLibrary( l->handle );
if( !res ) {
wolf_system_error_msg( l->errbuf, INTERNAL_ERRBUF_SIZE );
return WOLF_ERR_INTERNAL;
}
#endif /* defined _WIN32 */
free( l );
l = NULL;
return WOLF_OK;
}
char *wolf_library_error_msg( const wolf_library_p library, char *buf, size_t buflen ) {
strncpy( buf, library->errbuf, buflen );
return buf;
}
WOLF_LIBRARY_FUNCPTR wolf_library_get( const wolf_library_p l, const char *name, wolf_error_t *error ) {
WOLF_LIBRARY_FUNCPTR ret;
#if !defined _WIN32
WOLF_LIBRARY_DLERROR_CONST char *err = NULL;
#endif /* !defined _WIN32 */
#if defined HAVE_DLFCN
/* clear error state before calling dlsym, so that calling dlsym
* can return a NULL as value of a symbol
*/
(void)dlerror( );
ret = dlsym( l->handle, name );
err = dlerror( );
if( err != NULL ) {
strncpy( l->errbuf, err, INTERNAL_ERRBUF_SIZE );
*error = WOLF_ERR_INTERNAL;
return ret;
}
#endif /* defined HAVE_DLFCN */
#if defined _WIN32
ret = GetProcAddress( l->handle, name );
if( ret == NULL ) {
wolf_system_error_msg( l->errbuf, INTERNAL_ERRBUF_SIZE );
*error = WOLF_ERR_INTERNAL;
return ret;
}
#endif /* defined _WIN32 */
*error = WOLF_OK;
return ret;
}
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