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/***
This file is part of PulseAudio.
Copyright 2012 Lennart Poettering
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 2.1 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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <systemd/sd-login.h>
#include <pulse/xmalloc.h>
#include <pulsecore/module.h>
#include <pulsecore/log.h>
#include <pulsecore/hashmap.h>
#include <pulsecore/idxset.h>
#include <pulsecore/modargs.h>
PA_MODULE_AUTHOR("Lennart Poettering");
PA_MODULE_DESCRIPTION("Create a client for each login session of this user");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(true);
static const char* const valid_modargs[] = {
NULL
};
struct session {
char *id;
pa_client *client;
};
struct userdata {
pa_module *module;
pa_core *core;
pa_hashmap *sessions, *previous_sessions;
sd_login_monitor *monitor;
pa_io_event *io;
};
static int add_session(struct userdata *u, const char *id) {
struct session *session;
pa_client_new_data data;
session = pa_xnew(struct session, 1);
session->id = pa_xstrdup(id);
pa_client_new_data_init(&data);
data.module = u->module;
data.driver = __FILE__;
pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "Login Session %s", id);
pa_proplist_sets(data.proplist, "systemd-login.session", id);
session->client = pa_client_new(u->core, &data);
pa_client_new_data_done(&data);
if (!session->client) {
pa_xfree(session->id);
pa_xfree(session);
return -1;
}
pa_hashmap_put(u->sessions, session->id, session);
pa_log_debug("Added new session %s", id);
/* Positive exit_idle_time is only useful when we have no session tracking
* capability, so we can set it to 0 now that we have detected a session.
* The benefit of setting exit_idle_time to 0 is that pulseaudio will exit
* immediately when the session ends. That in turn is useful, because some
* systems (those that use pam_systemd but don't use systemd for managing
* pulseaudio) clean $XDG_RUNTIME_DIR on logout, but fail to terminate all
* services that depend on the files in $XDG_RUNTIME_DIR. The directory
* contains our sockets, and if the sockets are removed without terminating
* pulseaudio, a quick relogin will likely cause trouble, because a new
* instance will be spawned while the old instance is still running. */
if (u->core->exit_idle_time > 0)
pa_core_set_exit_idle_time(u->core, 0);
return 0;
}
static void free_session(struct session *session) {
pa_assert(session);
pa_log_debug("Removing session %s", session->id);
pa_client_free(session->client);
pa_xfree(session->id);
pa_xfree(session);
}
static int get_session_list(struct userdata *u) {
int r;
char **sessions;
pa_hashmap *h;
struct session *o;
pa_assert(u);
r = sd_uid_get_sessions(getuid(), 0, &sessions);
if (r < 0)
return -1;
/* We copy all sessions that still exist from one hashmap to the
* other and then flush the remaining ones */
h = u->previous_sessions;
u->previous_sessions = u->sessions;
u->sessions = h;
if (sessions) {
char **s;
/* Note that the sessions array is allocated with libc's
* malloc()/free() calls, hence do not use pa_xfree() to free
* this here. */
for (s = sessions; *s; s++) {
o = pa_hashmap_remove(u->previous_sessions, *s);
if (o)
pa_hashmap_put(u->sessions, o->id, o);
else
add_session(u, *s);
free(*s);
}
free(sessions);
}
pa_hashmap_remove_all(u->previous_sessions);
return 0;
}
static void monitor_cb(
pa_mainloop_api*a,
pa_io_event* e,
int fd,
pa_io_event_flags_t events,
void *userdata) {
struct userdata *u = userdata;
pa_assert(u);
sd_login_monitor_flush(u->monitor);
get_session_list(u);
}
int pa__init(pa_module *m) {
struct userdata *u = NULL;
pa_modargs *ma;
sd_login_monitor *monitor = NULL;
int r;
pa_assert(m);
/* If we are not actually running logind become a NOP */
if (access("/run/systemd/seats/", F_OK) < 0)
return 0;
ma = pa_modargs_new(m->argument, valid_modargs);
if (!ma) {
pa_log("Failed to parse module arguments");
goto fail;
}
r = sd_login_monitor_new("session", &monitor);
if (r < 0) {
pa_log("Failed to create session monitor: %s", strerror(-r));
goto fail;
}
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
u->sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
u->previous_sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
u->monitor = monitor;
u->io = u->core->mainloop->io_new(u->core->mainloop, sd_login_monitor_get_fd(monitor), PA_IO_EVENT_INPUT, monitor_cb, u);
if (get_session_list(u) < 0)
goto fail;
pa_modargs_free(ma);
return 0;
fail:
if (ma)
pa_modargs_free(ma);
pa__done(m);
return -1;
}
void pa__done(pa_module *m) {
struct userdata *u;
pa_assert(m);
u = m->userdata;
if (!u)
return;
if (u->sessions) {
pa_hashmap_free(u->sessions);
pa_hashmap_free(u->previous_sessions);
}
if (u->io)
m->core->mainloop->io_free(u->io);
if (u->monitor)
sd_login_monitor_unref(u->monitor);
pa_xfree(u);
}
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