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// loader.h: dynamic backend library loader
// This file is part of scanbuttond.
// Copyleft )c( 2005-2006 by Bernhard Stiftner
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <limits.h>
#include <dlfcn.h>
#include <errno.h>
#include "scanbuttond/common.h"
#include "scanbuttond/loader.h"
static char* lib_dir = STRINGIFY(LIB_DIR);
int scanbtnd_loader_init(void)
{
/* int error = lt_dlinit();
if (!error) {
error = lt_dlsetsearchpath(module_search_path);
const char *env_path = getenv(MODULE_PATH_ENV);
if (env_path != NULL) {
error = lt_dladdsearchdir(env_path);
}
}
return error;*/
return 0;
}
void scanbtnd_loader_exit(void)
{
/* lt_dlexit();*/
}
backend_t* scanbtnd_load_backend(const char* filename)
{
const char* error;
void* dll_handle;
char* dll_path = (char*)malloc(strlen(lib_dir) + strlen(filename) + 5);
strcpy(dll_path, filename);
strcat(dll_path, ".so");
dll_handle = dlopen(dll_path, RTLD_NOW|RTLD_LOCAL);
if (!dll_handle) {
strcpy(dll_path, lib_dir);
strcat(dll_path, "/");
strcat(dll_path, filename);
strcat(dll_path, ".so");
dll_handle = dlopen(dll_path, RTLD_NOW|RTLD_LOCAL);
if (!dll_handle) {
syslog(LOG_ERR, "loader: failed to load \"%s\". Error message: \"%s\"",
filename, dlerror());
free(dll_path);
return NULL;
}
}
dlerror(); // Clear any existing error
backend_t* backend = (backend_t*)malloc(sizeof(backend_t));
backend->handle = (void*)dll_handle;
backend->scanbtnd_get_backend_name = dlsym(dll_handle, "scanbtnd_get_backend_name");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_init = dlsym(dll_handle, "scanbtnd_init");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_rescan = dlsym(dll_handle, "scanbtnd_rescan");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_get_supported_devices = dlsym(dll_handle, "scanbtnd_get_supported_devices");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_open = dlsym(dll_handle, "scanbtnd_open");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_close = dlsym(dll_handle, "scanbtnd_close");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_get_button = dlsym(dll_handle, "scanbtnd_get_button");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_get_sane_device_descriptor = dlsym(dll_handle, "scanbtnd_get_sane_device_descriptor");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
backend->scanbtnd_exit = dlsym(dll_handle, "scanbtnd_exit");
if ((error = dlerror()) != NULL) {
syslog(LOG_ERR, "loader: dlsym failed! Error message \"%s\"", error);
dlclose(dll_handle);
free(backend);
free(dll_path);
return NULL;
}
free(dll_path);
return backend;
}
void scanbtnd_unload_backend(backend_t* backend)
{
if (backend->handle != NULL) {
dlclose(backend->handle);
backend->handle = NULL;
free(backend);
}
}
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