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/*
The MIT License (MIT)
Copyright (c) 2013, Jardel Weyrich <jweyrich at gmail dot com>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
In addition, as a special exception, the copyright holders give
permission to link the code of portions of this program with the
OpenSSL library under certain conditions as described in each
individual source file, and distribute linked combinations
including the two.
You must obey the GNU General Public License in all respects
for all of the code used other than OpenSSL. If you modify
file(s) with this exception, you may extend this exception to your
version of the file(s), but you are not obligated to do so. If you
do not wish to do so, delete this exception statement from your
version. If you delete this exception statement from all source
files in the program, then also delete it here.
*/
#include "dylib.h"
#include "common.h"
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>
inline const char *dylib_error(dylib_t *lib) {
UNUSED(lib);
return dlerror();
}
int dylib_load(dylib_t *lib, const char *path) {
if (lib->loaded) {
fprintf(stderr, "Can't load library because it's already loaded: %s\n", lib->path);
return -1;
}
lib->handle = dlopen(path, RTLD_LAZY | RTLD_GLOBAL);
lib->loaded = lib->handle != NULL;
if (!lib->loaded) {
fprintf(stderr, "Failed to load library %s: %s\n", path, dylib_error(lib));
return -1;
}
lib->path = strdup(path);
return 0;
}
int dylib_unload(dylib_t *lib) {
int ret;
if (!lib->loaded || lib->handle == NULL) {
fprintf(stderr, "Can't unload library '%s' because it's not loaded\n", lib->path);
return -1;
}
ret = dlclose(lib->handle);
if (ret != 0) {
fprintf(stderr, "Failed to unload library %s: %s\n", lib->path, dylib_error(lib));
return -1;
}
lib->handle = NULL;
free(lib->path);
lib->path = NULL;
lib->loaded = 0;
return 0;
}
void *dylib_get_symbol(dylib_t *lib, const char *symbol) {
void *addr = dlsym(lib->handle, symbol);
if (addr == NULL) {
fprintf(stderr, "Symbol '%s' not found in '%s': %s\n", symbol, lib->path, dylib_error(lib));
}
return addr;
}
int dylib_has_symbol(dylib_t *lib, const char *symbol) {
void *addr = dlsym(lib->handle, symbol);
return addr != NULL;
}
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