2 * Asterisk -- A telephony toolkit for Linux.
6 * Copyright (C) 1999, Adtran Inc. and Linux Support Services, LLC
8 * Mark Spencer <markster@linux-support.net>
10 * This program is free software, distributed under the terms of
11 * the GNU General Public License
19 #include <asterisk/module.h>
20 #include <asterisk/options.h>
21 #include <asterisk/config.h>
22 #include <asterisk/logger.h>
29 int (*load_module)(void);
30 int (*unload_module)(void);
31 int (*usecount)(void);
32 char *(*description)(void);
38 static struct loadupdate {
40 struct loadupdate *next;
43 static pthread_mutex_t modlock = PTHREAD_MUTEX_INITIALIZER;
45 static struct module *module_list=NULL;
47 int ast_unload_resource(char *resource_name, int force)
49 struct module *m, *ml = NULL;
51 if (pthread_mutex_lock(&modlock))
52 ast_log(LOG_WARNING, "Failed to lock\n");
55 if (!strcasecmp(m->resource, resource_name)) {
56 if ((res = m->usecount()) > 0) {
58 ast_log(LOG_WARNING, "Warning: Forcing removal of module %s with use count %d\n", resource_name, res);
60 ast_log(LOG_WARNING, "Soft unload failed, '%s' has use count %d\n", resource_name, res);
61 pthread_mutex_unlock(&modlock);
65 res = m->unload_module();
67 ast_log(LOG_WARNING, "Firm unload failed for %s\n", resource_name);
68 if (force <= AST_FORCE_FIRM) {
69 pthread_mutex_unlock(&modlock);
72 ast_log(LOG_WARNING, "** Dangerous **: Unloading resource anyway, at user request\n");
77 module_list = m->next;
84 pthread_mutex_unlock(&modlock);
85 ast_update_use_count();
89 int ast_load_resource(char *resource_name)
94 struct module *m = malloc(sizeof(struct module));
96 ast_log(LOG_WARNING, "Out of memory\n");
99 strncpy(m->resource, resource_name, sizeof(m->resource));
100 if (resource_name[0] == '/') {
101 strncpy(fn, resource_name, sizeof(fn));
103 snprintf(fn, sizeof(fn), "%s/%s", AST_MODULE_DIR, resource_name);
105 m->lib = dlopen(fn, RTLD_NOW | RTLD_GLOBAL);
107 ast_log(LOG_WARNING, "%s\n", dlerror());
111 m->load_module = dlsym(m->lib, "load_module");
112 if (!m->load_module) {
113 ast_log(LOG_WARNING, "No load_module in module %s\n", fn);
116 m->unload_module = dlsym(m->lib, "unload_module");
117 if (!m->unload_module) {
118 ast_log(LOG_WARNING, "No unload_module in module %s\n", fn);
121 m->usecount = dlsym(m->lib, "usecount");
123 ast_log(LOG_WARNING, "No usecount in module %s\n", fn);
126 m->description = dlsym(m->lib, "description");
127 if (!m->description) {
128 ast_log(LOG_WARNING, "No description in module %s\n", fn);
132 ast_log(LOG_WARNING, "%d error(s) loading module %s, aborted\n", errors, fn);
138 ast_verbose( " => (%s)\n", m->description());
139 if ((res = m->load_module())) {
140 ast_log(LOG_WARNING, "%s: load_module failed, returning %d\n", m->resource, fn, res);
144 if (pthread_mutex_lock(&modlock))
145 ast_log(LOG_WARNING, "Failed to lock\n");
146 m->next = module_list;
148 pthread_mutex_unlock(&modlock);
149 ast_update_use_count();
153 int ast_resource_exists(char *resource)
156 if (pthread_mutex_lock(&modlock))
157 ast_log(LOG_WARNING, "Failed to lock\n");
160 if (!strcasecmp(resource, m->resource))
164 pthread_mutex_unlock(&modlock);
173 struct ast_config *cfg;
174 struct ast_variable *v;
176 ast_verbose( "Asterisk Dynamic Loader Starting:\n");
177 cfg = ast_load(AST_MODULE_CONFIG);
179 /* Load explicitly defined modules */
180 v = ast_variable_browse(cfg, "modules");
182 if (!strcasecmp(v->name, "load")) {
183 if (option_debug && !option_verbose)
184 ast_log(LOG_DEBUG, "Loading module %s\n", v->value);
185 if (option_verbose) {
186 ast_verbose( " [%s]", v->value);
189 if (ast_load_resource(v->value)) {
190 ast_log(LOG_WARNING, "Loading module %s failed!\n", v->value);
199 if (!cfg || ast_true(ast_variable_retrieve(cfg, "modules", "autoload"))) {
200 /* Load all modules */
203 mods = opendir(AST_MODULE_DIR);
205 while((d = readdir(mods))) {
206 /* Must end in .so to load it. */
207 if ((strlen(d->d_name) > 3) &&
208 !strcasecmp(d->d_name + strlen(d->d_name) - 3, ".so") &&
209 !ast_resource_exists(d->d_name)) {
210 /* It's a shared library -- Just be sure we're allowed to load it -- kinda
211 an inefficient way to do it, but oh well. */
213 v = ast_variable_browse(cfg, "modules");
215 if (!strcasecmp(v->name, "noload") &&
216 !strcasecmp(v->value, d->d_name))
221 if (option_verbose) {
222 ast_verbose( VERBOSE_PREFIX_1 "[skipping %s]\n", d->d_name);
229 if (option_debug && !option_verbose)
230 ast_log(LOG_DEBUG, "Loading module %s\n", d->d_name);
231 if (option_verbose) {
232 ast_verbose( VERBOSE_PREFIX_1 "[%s]", d->d_name);
235 if (ast_load_resource(d->d_name)) {
236 ast_log(LOG_WARNING, "Loading module %s failed!\n", d->d_name);
245 ast_log(LOG_WARNING, "Unable to open modules directory " AST_MODULE_DIR ".\n");
252 void ast_update_use_count(void)
254 /* Notify any module monitors that the use count for a
255 resource has changed */
256 struct loadupdate *m;
257 if (pthread_mutex_lock(&modlock))
258 ast_log(LOG_WARNING, "Failed to lock\n");
264 pthread_mutex_unlock(&modlock);
268 int ast_update_module_list(int (*modentry)(char *module, char *description, int usecnt))
272 if (pthread_mutex_trylock(&modlock))
276 modentry(m->resource, m->description(), m->usecount());
280 pthread_mutex_unlock(&modlock);
284 int ast_loader_register(int (*v)(void))
286 struct loadupdate *tmp;
287 /* XXX Should be more flexible here, taking > 1 verboser XXX */
288 if ((tmp = malloc(sizeof (struct loadupdate)))) {
290 if (pthread_mutex_lock(&modlock))
291 ast_log(LOG_WARNING, "Failed to lock\n");
292 tmp->next = updaters;
294 pthread_mutex_unlock(&modlock);
300 int ast_loader_unregister(int (*v)(void))
303 struct loadupdate *tmp, *tmpl=NULL;
304 if (pthread_mutex_lock(&modlock))
305 ast_log(LOG_WARNING, "Failed to lock\n");
308 if (tmp->updater == v) {
310 tmpl->next = tmp->next;
312 updaters = tmp->next;
320 pthread_mutex_unlock(&modlock);