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/*
Copyright (C) 2010 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 "port/sys_internal.h"
#include "port/unused.h"
#include "port/stdlib.h" /* for malloc, free */
#include "port/stdio.h" /* for snprintf */
#include "port/gettext.h" /* for i18n */
#include "port/string.h" /* for strncpy */
#ifdef HAVE_DLFCN
#include <dlfcn.h> /* for dlopen. dlclose functions */
#endif
#define INTERNAL_ERRBUF_SIZE 256
struct wolf_library_t {
void *handle; /**< the OS handle for the library */
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;
}
#else
#error Not using DLFCN as shared loader. Port first!
#endif
*error = WOLF_OK;
return l;
}
wolf_error_t wolf_library_unload( wolf_library_p l ) {
int res = 0;
if( l == NULL || l->handle == NULL ) {
return WOLF_ERR_INVALID_STATE;
}
res = dlclose( l->handle );
if( res != 0 ) {
strncpy( l->errbuf, dlerror( ), INTERNAL_ERRBUF_SIZE );
return WOLF_ERR_INTERNAL;
}
free( l );
l = NULL;
return WOLF_OK;
}
char *wolf_library_errmsg( const wolf_error_t error, const wolf_library_p library, char *buf, size_t buflen ) {
(void)wolf_error_msg( error, buf, buflen );
strncat( buf, " - ", buflen - strlen( buf ) );
if( error == WOLF_ERR_INTERNAL ) {
strncat( buf, library->errbuf, buflen - strlen( buf ) );
}
return buf;
}
void *wolf_library_get( const wolf_library_p l, const char *name, wolf_error_t *error ) {
void *ret;
ret = dlsym( l->handle, name );
*error = WOLF_OK;
return ret;
}
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