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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
PulseAudio 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 Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <pulse/timeval.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-subscribe.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>
#include <pulsecore/ltdl-helper.h>
#include "module.h"
#define PA_SYMBOL_INIT "pa__init"
#define PA_SYMBOL_DONE "pa__done"
#define PA_SYMBOL_LOAD_ONCE "pa__load_once"
#define PA_SYMBOL_GET_N_USED "pa__get_n_used"
pa_module* pa_module_load(pa_core *c, const char *name, const char *argument) {
pa_module *m = NULL;
pa_bool_t (*load_once)(void);
pa_assert(c);
pa_assert(name);
if (c->disallow_module_loading)
goto fail;
m = pa_xnew(pa_module, 1);
m->name = pa_xstrdup(name);
m->argument = pa_xstrdup(argument);
m->load_once = FALSE;
if (!(m->dl = lt_dlopenext(name))) {
pa_log("Failed to open module \"%s\": %s", name, lt_dlerror());
goto fail;
}
if ((load_once = (pa_bool_t (*)(void)) pa_load_sym(m->dl, name, PA_SYMBOL_LOAD_ONCE))) {
m->load_once = load_once();
if (m->load_once && c->modules) {
pa_module *i;
uint32_t idx;
/* OK, the module only wants to be loaded once, let's make sure it is */
for (i = pa_idxset_first(c->modules, &idx); i; i = pa_idxset_next(c->modules, &idx)) {
if (strcmp(name, i->name) == 0) {
pa_log("Module \"%s\" should be loaded once at most. Refusing to load.", name);
goto fail;
}
}
}
}
if (!(m->init = (int (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_INIT))) {
pa_log("Failed to load module \"%s\": symbol \""PA_SYMBOL_INIT"\" not found.", name);
goto fail;
}
m->done = (void (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_DONE);
m->get_n_used = (int (*)(pa_module*_m)) pa_load_sym(m->dl, name, PA_SYMBOL_GET_N_USED);
m->userdata = NULL;
m->core = c;
m->unload_requested = FALSE;
if (m->init(m) < 0) {
pa_log_error("Failed to load module \"%s\" (argument: \"%s\"): initialization failed.", name, argument ? argument : "");
goto fail;
}
if (!c->modules)
c->modules = pa_idxset_new(NULL, NULL);
pa_assert_se(pa_idxset_put(c->modules, m, &m->index) >= 0);
pa_assert(m->index != PA_IDXSET_INVALID);
pa_log_info("Loaded \"%s\" (index: #%u; argument: \"%s\").", m->name, m->index, m->argument ? m->argument : "");
pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
return m;
fail:
if (m) {
pa_xfree(m->argument);
pa_xfree(m->name);
if (m->dl)
lt_dlclose(m->dl);
pa_xfree(m);
}
return NULL;
}
static void pa_module_free(pa_module *m) {
pa_assert(m);
pa_assert(m->core);
pa_log_info("Unloading \"%s\" (index: #%u).", m->name, m->index);
if (m->done)
m->done(m);
lt_dlclose(m->dl);
pa_log_info("Unloaded \"%s\" (index: #%u).", m->name, m->index);
pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
pa_xfree(m->name);
pa_xfree(m->argument);
pa_xfree(m);
}
void pa_module_unload(pa_core *c, pa_module *m, pa_bool_t force) {
pa_assert(c);
pa_assert(m);
if (m->core->disallow_module_loading && !force)
return;
if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
return;
pa_module_free(m);
}
void pa_module_unload_by_index(pa_core *c, uint32_t idx, pa_bool_t force) {
pa_module *m;
pa_assert(c);
pa_assert(idx != PA_IDXSET_INVALID);
if (c->disallow_module_loading && !force)
return;
if (!(m = pa_idxset_remove_by_index(c->modules, idx)))
return;
pa_module_free(m);
}
void pa_module_unload_all(pa_core *c) {
pa_assert(c);
if (c->modules) {
pa_module *m;
while ((m = pa_idxset_steal_first(c->modules, NULL)))
pa_module_free(m);
pa_idxset_free(c->modules, NULL, NULL);
c->modules = NULL;
}
if (c->module_defer_unload_event) {
c->mainloop->defer_free(c->module_defer_unload_event);
c->module_defer_unload_event = NULL;
}
}
static void defer_cb(pa_mainloop_api*api, pa_defer_event *e, void *userdata) {
void *state = NULL;
pa_core *c = PA_CORE(userdata);
pa_module *m;
pa_core_assert_ref(c);
api->defer_enable(e, 0);
if (!c->modules)
return;
while ((m = pa_idxset_iterate(c->modules, &state, NULL)))
if (m->unload_requested)
pa_module_unload(c, m, TRUE);
}
void pa_module_unload_request(pa_module *m, pa_bool_t force) {
pa_assert(m);
if (m->core->disallow_module_loading && !force)
return;
m->unload_requested = TRUE;
if (!m->core->module_defer_unload_event)
m->core->module_defer_unload_event = m->core->mainloop->defer_new(m->core->mainloop, defer_cb, m->core);
m->core->mainloop->defer_enable(m->core->module_defer_unload_event, 1);
}
void pa_module_unload_request_by_index(pa_core *c, uint32_t idx, pa_bool_t force) {
pa_module *m;
pa_assert(c);
if (!(m = pa_idxset_get_by_index(c->modules, idx)))
return;
pa_module_unload_request(m, force);
}
int pa_module_get_n_used(pa_module*m) {
pa_assert(m);
if (!m->get_n_used)
return -1;
return m->get_n_used(m);
}
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