code.delx.au - pulseaudio/blob - src/daemon/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <signal.h>
  32 #include <stddef.h>
  33 #include <assert.h>
  34 #include <ltdl.h>
  35 #include <limits.h>
  36 #include <fcntl.h>
  37 #include <unistd.h>
  38 #include <locale.h>
  39 #include <sys/types.h>
  40 #include <liboil/liboil.h>
  41
  42 #ifdef HAVE_SYS_IOCTL_H
  43 #include <sys/ioctl.h>
  44 #endif
  45
  46 #ifdef HAVE_LIBWRAP
  47 #include <syslog.h>
  48 #include <tcpd.h>
  49 #endif
  50
  51 #include "../pulsecore/winsock.h"
  52
  53 #include <pulse/mainloop.h>
  54 #include <pulse/mainloop-signal.h>
  55 #include <pulse/xmalloc.h>
  56
  57 #include <pulsecore/core-error.h>
  58 #include <pulsecore/core.h>
  59 #include <pulsecore/memblock.h>
  60 #include <pulsecore/module.h>
  61 #include <pulsecore/cli-command.h>
  62 #include <pulsecore/log.h>
  63 #include <pulsecore/core-util.h>
  64 #include <pulsecore/sioman.h>
  65 #include <pulsecore/cli-text.h>
  66 #include <pulsecore/pid.h>
  67 #include <pulsecore/namereg.h>
  68 #include <pulsecore/random.h>
  69
  70 #include "cmdline.h"
  71 #include "cpulimit.h"
  72 #include "daemon-conf.h"
  73 #include "dumpmodules.h"
  74 #include "caps.h"
  75
  76 #ifdef HAVE_LIBWRAP
  77 /* Only one instance of these variables */
  78 int allow_severity = LOG_INFO;
  79 int deny_severity = LOG_WARNING;
  80 #endif
  81
  82 #ifdef HAVE_OSS
  83 /* padsp looks for this symbol in the running process and disables
  84  * itself if it finds it and it is set to 7 (which is actually a bit
  85  * mask). For details see padsp. */
  86 int __padsp_disabled__ = 7;
  87 #endif
  88
  89 #ifdef OS_IS_WIN32
  90
  91 static void message_cb(pa_mainloop_api*a, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
  92     MSG msg;
  93     struct timeval tvnext;
  94
  95     while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
  96         if (msg.message == WM_QUIT)
  97             raise(SIGTERM);
  98         else {
  99             TranslateMessage(&msg);
 100             DispatchMessage(&msg);
 101         }
 102     }
 103
 104     pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
 105     a->time_restart(e, &tvnext);
 106 }
 107
 108 #endif
 109
 110 static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
 111     pa_log_info(__FILE__": Got signal %s.", pa_strsignal(sig));
 112
 113     switch (sig) {
 114 #ifdef SIGUSR1
 115         case SIGUSR1:
 116             pa_module_load(userdata, "module-cli", NULL);
 117             break;
 118 #endif
 119
 120 #ifdef SIGUSR2
 121         case SIGUSR2:
 122             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 123             break;
 124 #endif
 125
 126 #ifdef SIGHUP
 127         case SIGHUP: {
 128             char *c = pa_full_status_string(userdata);
 129             pa_log_notice("%s", c);
 130             pa_xfree(c);
 131             return;
 132         }
 133 #endif
 134
 135         case SIGINT:
 136         case SIGTERM:
 137         default:
 138             pa_log_info(__FILE__": Exiting.");
 139             m->quit(m, 1);
 140             break;
 141     }
 142 }
 143
 144 static void close_pipe(int p[2]) {
 145     if (p[0] != -1)
 146         close(p[0]);
 147     if (p[1] != -1)
 148         close(p[1]);
 149     p[0] = p[1] = -1;
 150 }
 151
 152 int main(int argc, char *argv[]) {
 153     pa_core *c;
 154     pa_strbuf *buf = NULL;
 155     pa_daemon_conf *conf;
 156     pa_mainloop *mainloop;
 157
 158     char *s;
 159     int r, retval = 1, d = 0;
 160     int daemon_pipe[2] = { -1, -1 };
 161     int suid_root;
 162     int valid_pid_file = 0;
 163
 164 #ifdef HAVE_GETUID
 165     gid_t gid = (gid_t) -1;
 166 #endif
 167
 168 #ifdef OS_IS_WIN32
 169     pa_time_event *timer;
 170     struct timeval tv;
 171 #endif
 172
 173     setlocale(LC_ALL, "");
 174
 175     pa_limit_caps();
 176
 177 #ifdef HAVE_GETUID
 178     suid_root = getuid() != 0 && geteuid() == 0;
 179
 180     if (suid_root && (pa_own_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
 181         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.");
 182         pa_drop_root();
 183     }
 184 #else
 185     suid_root = 0;
 186 #endif
 187
 188     LTDL_SET_PRELOADED_SYMBOLS();
 189
 190     r = lt_dlinit();
 191     assert(r == 0);
 192
 193 #ifdef OS_IS_WIN32
 194     {
 195         WSADATA data;
 196         WSAStartup(MAKEWORD(2, 0), &data);
 197     }
 198 #endif
 199
 200     pa_random_seed();
 201
 202     pa_log_set_ident("pulseaudio");
 203
 204     conf = pa_daemon_conf_new();
 205
 206     if (pa_daemon_conf_load(conf, NULL) < 0)
 207         goto finish;
 208
 209     if (pa_daemon_conf_env(conf) < 0)
 210         goto finish;
 211
 212     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 213         pa_log(__FILE__": failed to parse command line.");
 214         goto finish;
 215     }
 216
 217     pa_log_set_maximal_level(conf->log_level);
 218     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 219
 220     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 221         pa_raise_priority();
 222
 223     pa_drop_caps();
 224
 225     if (suid_root)
 226         pa_drop_root();
 227
 228     if (conf->dl_search_path)
 229         lt_dlsetsearchpath(conf->dl_search_path);
 230
 231     switch (conf->cmd) {
 232         case PA_CMD_DUMP_MODULES:
 233             pa_dump_modules(conf, argc-d, argv+d);
 234             retval = 0;
 235             goto finish;
 236
 237         case PA_CMD_DUMP_CONF: {
 238             s = pa_daemon_conf_dump(conf);
 239             fputs(s, stdout);
 240             pa_xfree(s);
 241             retval = 0;
 242             goto finish;
 243         }
 244
 245         case PA_CMD_HELP :
 246             pa_cmdline_help(argv[0]);
 247             retval = 0;
 248             goto finish;
 249
 250         case PA_CMD_VERSION :
 251             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 252             retval = 0;
 253             goto finish;
 254
 255         case PA_CMD_CHECK: {
 256             pid_t pid;
 257
 258             if (pa_pid_file_check_running(&pid) < 0) {
 259                 pa_log_info(__FILE__": daemon not running");
 260             } else {
 261                 pa_log_info(__FILE__": daemon running as PID %u", pid);
 262                 retval = 0;
 263             }
 264
 265             goto finish;
 266
 267         }
 268         case PA_CMD_KILL:
 269
 270             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 271                 pa_log(__FILE__": failed to kill daemon.");
 272             else
 273                 retval = 0;
 274
 275             goto finish;
 276
 277         default:
 278             assert(conf->cmd == PA_CMD_DAEMON);
 279     }
 280
 281     if (conf->daemonize) {
 282         pid_t child;
 283         int tty_fd;
 284
 285         if (pa_stdio_acquire() < 0) {
 286             pa_log(__FILE__": failed to acquire stdio.");
 287             goto finish;
 288         }
 289
 290 #ifdef HAVE_FORK
 291         if (pipe(daemon_pipe) < 0) {
 292             pa_log(__FILE__": failed to create pipe.");
 293             goto finish;
 294         }
 295
 296         if ((child = fork()) < 0) {
 297             pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
 298             goto finish;
 299         }
 300
 301         if (child != 0) {
 302             /* Father */
 303
 304             close(daemon_pipe[1]);
 305             daemon_pipe[1] = -1;
 306
 307             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 308                 pa_log(__FILE__": read() failed: %s", pa_cstrerror(errno));
 309                 retval = 1;
 310             }
 311
 312             if (retval)
 313                 pa_log(__FILE__": daemon startup failed.");
 314             else
 315                 pa_log_info(__FILE__": daemon startup successful.");
 316
 317             goto finish;
 318         }
 319
 320         close(daemon_pipe[0]);
 321         daemon_pipe[0] = -1;
 322 #endif
 323
 324         if (conf->auto_log_target)
 325             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 326
 327 #ifdef HAVE_SETSID
 328         setsid();
 329 #endif
 330 #ifdef HAVE_SETPGID
 331         setpgid(0,0);
 332 #endif
 333
 334 #ifndef OS_IS_WIN32
 335         close(0);
 336         close(1);
 337         close(2);
 338
 339         open("/dev/null", O_RDONLY);
 340         open("/dev/null", O_WRONLY);
 341         open("/dev/null", O_WRONLY);
 342 #else
 343         FreeConsole();
 344 #endif
 345
 346 #ifdef SIGTTOU
 347         signal(SIGTTOU, SIG_IGN);
 348 #endif
 349 #ifdef SIGTTIN
 350         signal(SIGTTIN, SIG_IGN);
 351 #endif
 352 #ifdef SIGTSTP
 353         signal(SIGTSTP, SIG_IGN);
 354 #endif
 355
 356 #ifdef TIOCNOTTY
 357         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 358             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 359             close(tty_fd);
 360         }
 361 #endif
 362     }
 363
 364     chdir("/");
 365
 366     if (conf->use_pid_file) {
 367         if (pa_pid_file_create() < 0) {
 368             pa_log(__FILE__": pa_pid_file_create() failed.");
 369 #ifdef HAVE_FORK
 370             if (conf->daemonize)
 371                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 372 #endif
 373             goto finish;
 374         }
 375
 376         valid_pid_file = 1;
 377     }
 378
 379 #ifdef SIGPIPE
 380     signal(SIGPIPE, SIG_IGN);
 381 #endif
 382
 383     mainloop = pa_mainloop_new();
 384     assert(mainloop);
 385
 386     c = pa_core_new(pa_mainloop_get_api(mainloop));
 387     assert(c);
 388
 389     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 390     assert(r == 0);
 391     pa_signal_new(SIGINT, signal_callback, c);
 392     pa_signal_new(SIGTERM, signal_callback, c);
 393
 394 #ifdef SIGUSR1
 395     pa_signal_new(SIGUSR1, signal_callback, c);
 396 #endif
 397 #ifdef SIGUSR2
 398     pa_signal_new(SIGUSR2, signal_callback, c);
 399 #endif
 400 #ifdef SIGHUP
 401     pa_signal_new(SIGHUP, signal_callback, c);
 402 #endif
 403
 404 #ifdef OS_IS_WIN32
 405     timer = pa_mainloop_get_api(mainloop)->time_new(
 406         pa_mainloop_get_api(mainloop), pa_gettimeofday(&tv), message_cb, NULL);
 407     assert(timer);
 408 #endif
 409
 410     if (conf->daemonize)
 411         c->running_as_daemon = 1;
 412
 413     oil_init();
 414
 415     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 416     assert(r == 0);
 417
 418     buf = pa_strbuf_new();
 419     if (conf->default_script_file)
 420         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 421
 422     if (r >= 0)
 423         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 424     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
 425     pa_xfree(s);
 426
 427     if (r < 0 && conf->fail) {
 428         pa_log(__FILE__": failed to initialize daemon.");
 429 #ifdef HAVE_FORK
 430         if (conf->daemonize)
 431             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 432 #endif
 433     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
 434         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.");
 435 #ifdef HAVE_FORK
 436         if (conf->daemonize)
 437             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 438 #endif
 439     } else {
 440
 441         retval = 0;
 442 #ifdef HAVE_FORK
 443         if (conf->daemonize)
 444             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 445 #endif
 446
 447         c->disallow_module_loading = conf->disallow_module_loading;
 448         c->exit_idle_time = conf->exit_idle_time;
 449         c->module_idle_time = conf->module_idle_time;
 450         c->scache_idle_time = conf->scache_idle_time;
 451         c->resample_method = conf->resample_method;
 452
 453         if (c->default_sink_name &&
 454             pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
 455             pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.", __FILE__, c->default_sink_name);
 456             retval = 1;
 457         } else {
 458             pa_log_info(__FILE__": Daemon startup complete.");
 459             if (pa_mainloop_run(mainloop, &retval) < 0)
 460                 retval = 1;
 461             pa_log_info(__FILE__": Daemon shutdown initiated.");
 462         }
 463     }
 464
 465 #ifdef OS_IS_WIN32
 466     pa_mainloop_get_api(mainloop)->time_free(timer);
 467 #endif
 468
 469     pa_core_free(c);
 470
 471     pa_cpu_limit_done();
 472     pa_signal_done();
 473     pa_mainloop_free(mainloop);
 474
 475     pa_log_info(__FILE__": Daemon terminated.");
 476
 477 finish:
 478
 479     if (conf)
 480         pa_daemon_conf_free(conf);
 481
 482     if (valid_pid_file)
 483         pa_pid_file_remove();
 484
 485     close_pipe(daemon_pipe);
 486
 487 #ifdef OS_IS_WIN32
 488     WSACleanup();
 489 #endif
 490
 491     lt_dlexit();
 492
 493     return retval;
 494 }