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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <signal.h>
  33 #include <stddef.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
  41 #include <liboil/liboil.h>
  42
  43 #ifdef HAVE_SYS_IOCTL_H
  44 #include <sys/ioctl.h>
  45 #endif
  46
  47 #ifdef HAVE_PWD_H
  48 #include <pwd.h>
  49 #endif
  50 #ifdef HAVE_GRP_H
  51 #include <grp.h>
  52 #endif
  53
  54 #ifdef HAVE_LIBWRAP
  55 #include <syslog.h>
  56 #include <tcpd.h>
  57 #endif
  58
  59 #ifdef HAVE_DBUS
  60 #include <dbus/dbus.h>
  61 #endif
  62
  63 #include <pulse/mainloop.h>
  64 #include <pulse/mainloop-signal.h>
  65 #include <pulse/timeval.h>
  66 #include <pulse/xmalloc.h>
  67
  68 #include <pulsecore/winsock.h>
  69 #include <pulsecore/core-error.h>
  70 #include <pulsecore/core.h>
  71 #include <pulsecore/memblock.h>
  72 #include <pulsecore/module.h>
  73 #include <pulsecore/cli-command.h>
  74 #include <pulsecore/log.h>
  75 #include <pulsecore/core-util.h>
  76 #include <pulsecore/sioman.h>
  77 #include <pulsecore/cli-text.h>
  78 #include <pulsecore/pid.h>
  79 #include <pulsecore/namereg.h>
  80 #include <pulsecore/random.h>
  81 #include <pulsecore/rtsig.h>
  82 #include <pulsecore/rtclock.h>
  83 #include <pulsecore/macro.h>
  84 #include <pulsecore/mutex.h>
  85 #include <pulsecore/thread.h>
  86 #include <pulsecore/once.h>
  87 #include <pulsecore/shm.h>
  88
  89 #include "cmdline.h"
  90 #include "cpulimit.h"
  91 #include "daemon-conf.h"
  92 #include "dumpmodules.h"
  93 #include "caps.h"
  94 #include "ltdl-bind-now.h"
  95 #include "polkit.h"
  96
  97 #define AUTOSPAWN_LOCK "autospawn.lock"
  98
  99 #ifdef HAVE_LIBWRAP
 100 /* Only one instance of these variables */
 101 int allow_severity = LOG_INFO;
 102 int deny_severity = LOG_WARNING;
 103 #endif
 104
 105 #ifdef HAVE_OSS
 106 /* padsp looks for this symbol in the running process and disables
 107  * itself if it finds it and it is set to 7 (which is actually a bit
 108  * mask). For details see padsp. */
 109 int __padsp_disabled__ = 7;
 110 #endif
 111
 112 #ifdef OS_IS_WIN32
 113
 114 static void message_cb(pa_mainloop_api*a, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
 115     MSG msg;
 116     struct timeval tvnext;
 117
 118     while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
 119         if (msg.message == WM_QUIT)
 120             raise(SIGTERM);
 121         else {
 122             TranslateMessage(&msg);
 123             DispatchMessage(&msg);
 124         }
 125     }
 126
 127     pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
 128     a->time_restart(e, &tvnext);
 129 }
 130
 131 #endif
 132
 133 static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
 134     pa_log_info("Got signal %s.", pa_sig2str(sig));
 135
 136     switch (sig) {
 137 #ifdef SIGUSR1
 138         case SIGUSR1:
 139             pa_module_load(userdata, "module-cli", NULL);
 140             break;
 141 #endif
 142
 143 #ifdef SIGUSR2
 144         case SIGUSR2:
 145             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 146             break;
 147 #endif
 148
 149 #ifdef SIGHUP
 150         case SIGHUP: {
 151             char *c = pa_full_status_string(userdata);
 152             pa_log_notice("%s", c);
 153             pa_xfree(c);
 154             return;
 155         }
 156 #endif
 157
 158         case SIGINT:
 159         case SIGTERM:
 160         default:
 161             pa_log_info("Exiting.");
 162             m->quit(m, 1);
 163             break;
 164     }
 165 }
 166
 167 #if defined(HAVE_PWD_H) && defined(HAVE_GRP_H)
 168
 169 static int change_user(void) {
 170     struct passwd *pw;
 171     struct group * gr;
 172     int r;
 173
 174     /* This function is called only in system-wide mode. It creates a
 175      * runtime dir in /var/run/ with proper UID/GID and drops privs
 176      * afterwards. */
 177
 178     if (!(pw = getpwnam(PA_SYSTEM_USER))) {
 179         pa_log("Failed to find user '%s'.", PA_SYSTEM_USER);
 180         return -1;
 181     }
 182
 183     if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
 184         pa_log("Failed to find group '%s'.", PA_SYSTEM_GROUP);
 185         return -1;
 186     }
 187
 188     pa_log_info("Found user '%s' (UID %lu) and group '%s' (GID %lu).",
 189                 PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
 190                 PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
 191
 192     if (pw->pw_gid != gr->gr_gid) {
 193         pa_log("GID of user '%s' and of group '%s' don't match.", PA_SYSTEM_USER, PA_SYSTEM_GROUP);
 194         return -1;
 195     }
 196
 197     if (strcmp(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH) != 0)
 198         pa_log_warn("Warning: home directory of user '%s' is not '%s', ignoring.", PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
 199
 200     if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid) < 0) {
 201         pa_log("Failed to create '%s': %s", PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
 202         return -1;
 203     }
 204
 205     if (pa_make_secure_dir(PA_SYSTEM_STATE_PATH, 0700, pw->pw_uid, gr->gr_gid) < 0) {
 206         pa_log("Failed to create '%s': %s", PA_SYSTEM_STATE_PATH, pa_cstrerror(errno));
 207         return -1;
 208     }
 209
 210     /* We don't create the config dir here, because we don't need to write to it */
 211
 212     if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
 213         pa_log("Failed to change group list: %s", pa_cstrerror(errno));
 214         return -1;
 215     }
 216
 217 #if defined(HAVE_SETRESGID)
 218     r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
 219 #elif defined(HAVE_SETEGID)
 220     if ((r = setgid(gr->gr_gid)) >= 0)
 221         r = setegid(gr->gr_gid);
 222 #elif defined(HAVE_SETREGID)
 223     r = setregid(gr->gr_gid, gr->gr_gid);
 224 #else
 225 #error "No API to drop priviliges"
 226 #endif
 227
 228     if (r < 0) {
 229         pa_log("Failed to change GID: %s", pa_cstrerror(errno));
 230         return -1;
 231     }
 232
 233 #if defined(HAVE_SETRESUID)
 234     r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
 235 #elif defined(HAVE_SETEUID)
 236     if ((r = setuid(pw->pw_uid)) >= 0)
 237         r = seteuid(pw->pw_uid);
 238 #elif defined(HAVE_SETREUID)
 239     r = setreuid(pw->pw_uid, pw->pw_uid);
 240 #else
 241 #error "No API to drop priviliges"
 242 #endif
 243
 244     if (r < 0) {
 245         pa_log("Failed to change UID: %s", pa_cstrerror(errno));
 246         return -1;
 247     }
 248
 249     pa_set_env("USER", PA_SYSTEM_USER);
 250     pa_set_env("USERNAME", PA_SYSTEM_USER);
 251     pa_set_env("LOGNAME", PA_SYSTEM_USER);
 252     pa_set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
 253
 254     /* Relevant for pa_runtime_path() */
 255     pa_set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
 256     pa_set_env("PULSE_CONFIG_PATH", PA_SYSTEM_CONFIG_PATH);
 257     pa_set_env("PULSE_STATE_PATH", PA_SYSTEM_STATE_PATH);
 258
 259     pa_log_info("Successfully dropped root privileges.");
 260
 261     return 0;
 262 }
 263
 264 #else /* HAVE_PWD_H && HAVE_GRP_H */
 265
 266 static int change_user(void) {
 267     pa_log("System wide mode unsupported on this platform.");
 268     return -1;
 269 }
 270
 271 #endif /* HAVE_PWD_H && HAVE_GRP_H */
 272
 273 #ifdef HAVE_SYS_RESOURCE_H
 274
 275 static int set_one_rlimit(const pa_rlimit *r, int resource, const char *name) {
 276     struct rlimit rl;
 277     pa_assert(r);
 278
 279     if (!r->is_set)
 280         return 0;
 281
 282     rl.rlim_cur = rl.rlim_max = r->value;
 283
 284     if (setrlimit(resource, &rl) < 0) {
 285         pa_log_info("setrlimit(%s, (%u, %u)) failed: %s", name, (unsigned) r->value, (unsigned) r->value, pa_cstrerror(errno));
 286         return -1;
 287     }
 288
 289     return 0;
 290 }
 291
 292 static void set_all_rlimits(const pa_daemon_conf *conf) {
 293     set_one_rlimit(&conf->rlimit_fsize, RLIMIT_FSIZE, "RLIMIT_FSIZE");
 294     set_one_rlimit(&conf->rlimit_data, RLIMIT_DATA, "RLIMIT_DATA");
 295     set_one_rlimit(&conf->rlimit_stack, RLIMIT_STACK, "RLIMIT_STACK");
 296     set_one_rlimit(&conf->rlimit_core, RLIMIT_CORE, "RLIMIT_CORE");
 297     set_one_rlimit(&conf->rlimit_rss, RLIMIT_RSS, "RLIMIT_RSS");
 298 #ifdef RLIMIT_NPROC
 299     set_one_rlimit(&conf->rlimit_nproc, RLIMIT_NPROC, "RLIMIT_NPROC");
 300 #endif
 301     set_one_rlimit(&conf->rlimit_nofile, RLIMIT_NOFILE, "RLIMIT_NOFILE");
 302 #ifdef RLIMIT_MEMLOCK
 303     set_one_rlimit(&conf->rlimit_memlock, RLIMIT_MEMLOCK, "RLIMIT_MEMLOCK");
 304 #endif
 305     set_one_rlimit(&conf->rlimit_as, RLIMIT_AS, "RLIMIT_AS");
 306 #ifdef RLIMIT_LOCKS
 307     set_one_rlimit(&conf->rlimit_locks, RLIMIT_LOCKS, "RLIMIT_LOCKS");
 308 #endif
 309 #ifdef RLIMIT_SIGPENDING
 310     set_one_rlimit(&conf->rlimit_sigpending, RLIMIT_SIGPENDING, "RLIMIT_SIGPENDING");
 311 #endif
 312 #ifdef RLIMIT_MSGQUEUE
 313     set_one_rlimit(&conf->rlimit_msgqueue, RLIMIT_MSGQUEUE, "RLIMIT_MSGQUEUE");
 314 #endif
 315 #ifdef RLIMIT_NICE
 316     set_one_rlimit(&conf->rlimit_nice, RLIMIT_NICE, "RLIMIT_NICE");
 317 #endif
 318 #ifdef RLIMIT_RTPRIO
 319     set_one_rlimit(&conf->rlimit_rtprio, RLIMIT_RTPRIO, "RLIMIT_RTPRIO");
 320 #endif
 321 #ifdef RLIMIT_RTTIME
 322     set_one_rlimit(&conf->rlimit_rttime, RLIMIT_RTTIME, "RLIMIT_RTTIME");
 323 #endif
 324 }
 325 #endif
 326
 327 int main(int argc, char *argv[]) {
 328     pa_core *c = NULL;
 329     pa_strbuf *buf = NULL;
 330     pa_daemon_conf *conf = NULL;
 331     pa_mainloop *mainloop = NULL;
 332     char *s;
 333     int r = 0, retval = 1, d = 0;
 334     pa_bool_t suid_root, real_root;
 335     pa_bool_t valid_pid_file = FALSE;
 336     gid_t gid = (gid_t) -1;
 337     pa_bool_t ltdl_init = FALSE;
 338     int passed_fd = -1;
 339     const char *e;
 340 #ifdef HAVE_FORK
 341     int daemon_pipe[2] = { -1, -1 };
 342 #endif
 343 #ifdef OS_IS_WIN32
 344     pa_time_event *win32_timer;
 345     struct timeval win32_tv;
 346 #endif
 347     char *lf = NULL;
 348     int autospawn_lock_fd = -1;
 349
 350 #if defined(__linux__) && defined(__OPTIMIZE__)
 351     /*
 352        Disable lazy relocations to make usage of external libraries
 353        more deterministic for our RT threads. We abuse __OPTIMIZE__ as
 354        a check whether we are a debug build or not.
 355     */
 356
 357     if (!getenv("LD_BIND_NOW")) {
 358         char *rp;
 359
 360         /* We have to execute ourselves, because the libc caches the
 361          * value of $LD_BIND_NOW on initialization. */
 362
 363         pa_set_env("LD_BIND_NOW", "1");
 364         pa_assert_se(rp = pa_readlink("/proc/self/exe"));
 365         pa_assert_se(execv(rp, argv) == 0);
 366     }
 367 #endif
 368
 369 #ifdef HAVE_GETUID
 370     real_root = getuid() == 0;
 371     suid_root = !real_root && geteuid() == 0;
 372 #else
 373     real_root = FALSE;
 374     suid_root = FALSE;
 375 #endif
 376
 377     if (!real_root) {
 378         /* Drop all capabilities except CAP_SYS_NICE  */
 379         pa_limit_caps();
 380
 381         /* Drop priviliges, but keep CAP_SYS_NICE */
 382         pa_drop_root();
 383
 384         /* After dropping root, the effective set is reset, hence,
 385          * let's raise it again */
 386         pa_limit_caps();
 387
 388         /* When capabilities are not supported we will not be able to
 389          * aquire RT sched anymore. But yes, that's the way it is. It
 390          * is just too risky tun let PA run as root all the time. */
 391     }
 392
 393     if ((e = getenv("PULSE_PASSED_FD"))) {
 394         passed_fd = atoi(e);
 395
 396         if (passed_fd <= 2)
 397             passed_fd = -1;
 398     }
 399
 400     pa_close_all(passed_fd, -1);
 401
 402     pa_reset_sigs(-1);
 403     pa_unblock_sigs(-1);
 404
 405     /* At this point, we are a normal user, possibly with CAP_NICE if
 406      * we were started SUID. If we are started as normal root, than we
 407      * still are normal root. */
 408
 409     setlocale(LC_ALL, "");
 410     pa_log_set_maximal_level(PA_LOG_INFO);
 411     pa_log_set_ident("pulseaudio");
 412
 413     conf = pa_daemon_conf_new();
 414
 415     if (pa_daemon_conf_load(conf, NULL) < 0)
 416         goto finish;
 417
 418     if (pa_daemon_conf_env(conf) < 0)
 419         goto finish;
 420
 421     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 422         pa_log("Failed to parse command line.");
 423         goto finish;
 424     }
 425
 426     pa_log_set_maximal_level(conf->log_level);
 427     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 428
 429     pa_log_debug("Started as real root: %s, suid root: %s", pa_yes_no(real_root), pa_yes_no(suid_root));
 430
 431     if (!real_root && pa_have_caps()) {
 432         pa_bool_t allow_high_priority = FALSE, allow_realtime = FALSE;
 433
 434         /* Let's better not enable high prio or RT by default */
 435
 436         if (conf->high_priority && !allow_high_priority) {
 437             if (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) > 0) {
 438                 pa_log_info("We're in the group '"PA_REALTIME_GROUP"', allowing high-priority scheduling.");
 439                 allow_high_priority = TRUE;
 440             }
 441         }
 442
 443         if (conf->realtime_scheduling && !allow_realtime) {
 444             if (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) > 0) {
 445                 pa_log_info("We're in the group '"PA_REALTIME_GROUP"', allowing real-time scheduling.");
 446                 allow_realtime = TRUE;
 447             }
 448         }
 449
 450 #ifdef HAVE_POLKIT
 451         if (conf->high_priority && !allow_high_priority) {
 452             if (pa_polkit_check("org.pulseaudio.acquire-high-priority") > 0) {
 453                 pa_log_info("PolicyKit grants us acquire-high-priority privilege.");
 454                 allow_high_priority = TRUE;
 455             } else
 456                 pa_log_info("PolicyKit refuses acquire-high-priority privilege.");
 457         }
 458
 459         if (conf->realtime_scheduling && !allow_realtime) {
 460             if (pa_polkit_check("org.pulseaudio.acquire-real-time") > 0) {
 461                 pa_log_info("PolicyKit grants us acquire-real-time privilege.");
 462                 allow_realtime = TRUE;
 463             } else
 464                 pa_log_info("PolicyKit refuses acquire-real-time privilege.");
 465         }
 466 #endif
 467
 468         if (!allow_high_priority && !allow_realtime) {
 469
 470             /* OK, there's no further need to keep CAP_NICE. Hence
 471              * let's give it up early */
 472
 473             pa_drop_caps();
 474
 475             if (conf->high_priority || conf->realtime_scheduling)
 476                 pa_log_notice("Called SUID root and real-time/high-priority scheduling was requested in the configuration. However, we lack the necessary priviliges:\n"
 477                               "We are not in group '"PA_REALTIME_GROUP"' and PolicyKit refuse to grant us priviliges. Dropping SUID again.\n"
 478                               "For enabling real-time scheduling please acquire the appropriate PolicyKit priviliges, or become a member of '"PA_REALTIME_GROUP"', or increase the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user.");
 479         }
 480     }
 481
 482 #ifdef HAVE_SYS_RESOURCE_H
 483     /* Reset resource limits. If we are run as root (for system mode)
 484      * this might end up increasing the limits, which is intended
 485      * behaviour. For all other cases, i.e. started as normal user, or
 486      * SUID root at this point we should have no CAP_SYS_RESOURCE and
 487      * increasing the limits thus should fail. Which is, too, intended
 488      * behaviour */
 489
 490     set_all_rlimits(conf);
 491 #endif
 492
 493     if (conf->high_priority && !pa_can_high_priority())
 494         pa_log_warn("High-priority scheduling enabled in configuration but not allowed by policy.");
 495
 496     if (conf->high_priority && (conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START))
 497         pa_raise_priority(conf->nice_level);
 498
 499     if (!real_root && pa_have_caps()) {
 500         pa_bool_t drop;
 501
 502         drop = (conf->cmd != PA_CMD_DAEMON && conf->cmd != PA_CMD_START) || !conf->realtime_scheduling;
 503
 504 #ifdef RLIMIT_RTPRIO
 505         if (!drop) {
 506             struct rlimit rl;
 507             /* At this point we still have CAP_NICE if we were loaded
 508              * SUID root. If possible let's acquire RLIMIT_RTPRIO
 509              * instead and give CAP_NICE up. */
 510
 511             if (getrlimit(RLIMIT_RTPRIO, &rl) >= 0) {
 512
 513                 if (rl.rlim_cur >= 9)
 514                     drop = TRUE;
 515                 else {
 516                     rl.rlim_max = rl.rlim_cur = 9;
 517
 518                     if (setrlimit(RLIMIT_RTPRIO, &rl) >= 0) {
 519                         pa_log_info("Successfully increased RLIMIT_RTPRIO");
 520                         drop = TRUE;
 521                     } else
 522                         pa_log_warn("RLIMIT_RTPRIO failed: %s", pa_cstrerror(errno));
 523                 }
 524             }
 525         }
 526 #endif
 527
 528         if (drop)  {
 529             pa_log_info("Giving up CAP_NICE");
 530             pa_drop_caps();
 531             suid_root = FALSE;
 532         }
 533     }
 534
 535     if (conf->realtime_scheduling && !pa_can_realtime())
 536         pa_log_warn("Real-time scheduling enabled in configuration but not allowed by policy.");
 537
 538     pa_log_debug("Can realtime: %s, can high-priority: %s", pa_yes_no(pa_can_realtime()), pa_yes_no(pa_can_high_priority()));
 539
 540     LTDL_SET_PRELOADED_SYMBOLS();
 541     pa_ltdl_init();
 542     ltdl_init = TRUE;
 543
 544     if (conf->dl_search_path)
 545         lt_dlsetsearchpath(conf->dl_search_path);
 546
 547 #ifdef OS_IS_WIN32
 548     {
 549         WSADATA data;
 550         WSAStartup(MAKEWORD(2, 0), &data);
 551     }
 552 #endif
 553
 554     pa_random_seed();
 555
 556     switch (conf->cmd) {
 557         case PA_CMD_DUMP_MODULES:
 558             pa_dump_modules(conf, argc-d, argv+d);
 559             retval = 0;
 560             goto finish;
 561
 562         case PA_CMD_DUMP_CONF: {
 563             s = pa_daemon_conf_dump(conf);
 564             fputs(s, stdout);
 565             pa_xfree(s);
 566             retval = 0;
 567             goto finish;
 568         }
 569
 570         case PA_CMD_DUMP_RESAMPLE_METHODS: {
 571             int i;
 572
 573             for (i = 0; i < PA_RESAMPLER_MAX; i++)
 574                 if (pa_resample_method_supported(i))
 575                     printf("%s\n", pa_resample_method_to_string(i));
 576
 577             goto finish;
 578         }
 579
 580         case PA_CMD_HELP :
 581             pa_cmdline_help(argv[0]);
 582             retval = 0;
 583             goto finish;
 584
 585         case PA_CMD_VERSION :
 586             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 587             retval = 0;
 588             goto finish;
 589
 590         case PA_CMD_CHECK: {
 591             pid_t pid;
 592
 593             if (pa_pid_file_check_running(&pid, "pulseaudio") < 0)
 594                 pa_log_info("Daemon not running");
 595             else {
 596                 pa_log_info("Daemon running as PID %u", pid);
 597                 retval = 0;
 598             }
 599
 600             goto finish;
 601
 602         }
 603         case PA_CMD_KILL:
 604
 605             if (pa_pid_file_kill(SIGINT, NULL, "pulseaudio") < 0)
 606                 pa_log("Failed to kill daemon.");
 607             else
 608                 retval = 0;
 609
 610             goto finish;
 611
 612         case PA_CMD_CLEANUP_SHM:
 613
 614             if (pa_shm_cleanup() >= 0)
 615                 retval = 0;
 616
 617             goto finish;
 618
 619         default:
 620             pa_assert(conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START);
 621     }
 622
 623     if (real_root && !conf->system_instance)
 624         pa_log_warn("This program is not intended to be run as root (unless --system is specified).");
 625     else if (!real_root && conf->system_instance) {
 626         pa_log("Root priviliges required.");
 627         goto finish;
 628     }
 629
 630     if (conf->cmd == PA_CMD_START && conf->system_instance) {
 631         pa_log("--start not supported for system instances.");
 632         goto finish;
 633     }
 634
 635     if (conf->cmd == PA_CMD_START) {
 636         /* If we shall start PA only when it is not running yet, we
 637          * first take the autospawn lock to make things
 638          * synchronous. */
 639
 640         lf = pa_runtime_path(AUTOSPAWN_LOCK);
 641         autospawn_lock_fd = pa_lock_lockfile(lf);
 642     }
 643
 644     if (conf->daemonize) {
 645         pid_t child;
 646         int tty_fd;
 647
 648         if (pa_stdio_acquire() < 0) {
 649             pa_log("Failed to acquire stdio.");
 650             goto finish;
 651         }
 652
 653 #ifdef HAVE_FORK
 654         if (pipe(daemon_pipe) < 0) {
 655             pa_log("pipe failed: %s", pa_cstrerror(errno));
 656             goto finish;
 657         }
 658
 659         if ((child = fork()) < 0) {
 660             pa_log("fork() failed: %s", pa_cstrerror(errno));
 661             goto finish;
 662         }
 663
 664         if (child != 0) {
 665             ssize_t n;
 666             /* Father */
 667
 668             pa_assert_se(pa_close(daemon_pipe[1]) == 0);
 669             daemon_pipe[1] = -1;
 670
 671             if ((n = pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) {
 672
 673                 if (n < 0)
 674                     pa_log("read() failed: %s", pa_cstrerror(errno));
 675
 676                 retval = 1;
 677             }
 678
 679             if (retval)
 680                 pa_log("Daemon startup failed.");
 681             else
 682                 pa_log_info("Daemon startup successful.");
 683
 684             goto finish;
 685         }
 686
 687         if (autospawn_lock_fd >= 0) {
 688             /* The lock file is unlocked from the parent, so we need
 689              * to close it in the child */
 690
 691             pa_close(autospawn_lock_fd);
 692             autospawn_lock_fd = -1;
 693         }
 694
 695         pa_assert_se(pa_close(daemon_pipe[0]) == 0);
 696         daemon_pipe[0] = -1;
 697 #endif
 698
 699         if (conf->auto_log_target)
 700             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 701
 702 #ifdef HAVE_SETSID
 703         setsid();
 704 #endif
 705 #ifdef HAVE_SETPGID
 706         setpgid(0,0);
 707 #endif
 708
 709 #ifndef OS_IS_WIN32
 710         pa_close(0);
 711         pa_close(1);
 712         pa_close(2);
 713
 714         pa_assert_se(open("/dev/null", O_RDONLY) == 0);
 715         pa_assert_se(open("/dev/null", O_WRONLY) == 1);
 716         pa_assert_se(open("/dev/null", O_WRONLY) == 2);
 717 #else
 718         FreeConsole();
 719 #endif
 720
 721 #ifdef SIGTTOU
 722         signal(SIGTTOU, SIG_IGN);
 723 #endif
 724 #ifdef SIGTTIN
 725         signal(SIGTTIN, SIG_IGN);
 726 #endif
 727 #ifdef SIGTSTP
 728         signal(SIGTSTP, SIG_IGN);
 729 #endif
 730
 731 #ifdef TIOCNOTTY
 732         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 733             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 734             pa_assert_se(pa_close(tty_fd) == 0);
 735         }
 736 #endif
 737     }
 738
 739     pa_set_env("PULSE_INTERNAL", "1");
 740     pa_assert_se(chdir("/") == 0);
 741     umask(0022);
 742
 743     if (conf->system_instance)
 744         if (change_user() < 0)
 745             goto finish;
 746
 747     pa_set_env("PULSE_SYSTEM", conf->system_instance ? "1" : "0");
 748
 749     pa_log_info("This is PulseAudio " PACKAGE_VERSION);
 750     pa_log_info("Page size is %lu bytes", (unsigned long) PA_PAGE_SIZE);
 751     if (!(s = pa_get_runtime_dir()))
 752         goto finish;
 753     pa_log_info("Using runtime directory %s.", s);
 754     pa_xfree(s);
 755     if (!(s = pa_get_state_dir()))
 756         pa_log_info("Using state directory %s.", s);
 757     pa_xfree(s);
 758
 759     pa_log_info("Running in system mode: %s", pa_yes_no(pa_in_system_mode()));
 760
 761     if (conf->use_pid_file) {
 762         int z;
 763
 764         if ((z = pa_pid_file_create("pulseaudio")) != 0) {
 765
 766             if (conf->cmd == PA_CMD_START && z > 0) {
 767                 /* If we are already running and with are run in
 768                  * --start mode, then let's return this as success. */
 769
 770                 retval = 0;
 771                 goto finish;
 772             }
 773
 774             pa_log("pa_pid_file_create() failed.");
 775             goto finish;
 776         }
 777
 778         valid_pid_file = TRUE;
 779     }
 780
 781 #ifdef SIGPIPE
 782     signal(SIGPIPE, SIG_IGN);
 783 #endif
 784
 785     if (pa_rtclock_hrtimer())
 786         pa_log_info("Fresh high-resolution timers available! Bon appetit!");
 787     else
 788         pa_log_info("Dude, your kernel stinks! The chef's recommendation today is Linux with high-resolution timers enabled!");
 789
 790 #ifdef SIGRTMIN
 791     /* Valgrind uses SIGRTMAX. To easy debugging we don't use it here */
 792     pa_rtsig_configure(SIGRTMIN, SIGRTMAX-1);
 793 #endif
 794
 795     pa_assert_se(mainloop = pa_mainloop_new());
 796
 797     if (!(c = pa_core_new(pa_mainloop_get_api(mainloop), !conf->disable_shm))) {
 798         pa_log("pa_core_new() failed.");
 799         goto finish;
 800     }
 801
 802     c->default_sample_spec = conf->default_sample_spec;
 803     c->default_n_fragments = conf->default_n_fragments;
 804     c->default_fragment_size_msec = conf->default_fragment_size_msec;
 805     c->exit_idle_time = conf->exit_idle_time;
 806     c->module_idle_time = conf->module_idle_time;
 807     c->scache_idle_time = conf->scache_idle_time;
 808     c->resample_method = conf->resample_method;
 809     c->realtime_priority = conf->realtime_priority;
 810     c->realtime_scheduling = !!conf->realtime_scheduling;
 811     c->disable_remixing = !!conf->disable_remixing;
 812     c->running_as_daemon = !!conf->daemonize;
 813
 814     pa_assert_se(pa_signal_init(pa_mainloop_get_api(mainloop)) == 0);
 815     pa_signal_new(SIGINT, signal_callback, c);
 816     pa_signal_new(SIGTERM, signal_callback, c);
 817 #ifdef SIGUSR1
 818     pa_signal_new(SIGUSR1, signal_callback, c);
 819 #endif
 820 #ifdef SIGUSR2
 821     pa_signal_new(SIGUSR2, signal_callback, c);
 822 #endif
 823 #ifdef SIGHUP
 824     pa_signal_new(SIGHUP, signal_callback, c);
 825 #endif
 826
 827 #ifdef OS_IS_WIN32
 828     win32_timer = pa_mainloop_get_api(mainloop)->time_new(pa_mainloop_get_api(mainloop), pa_gettimeofday(&win32_tv), message_cb, NULL);
 829 #endif
 830
 831     oil_init();
 832
 833     if (!conf->no_cpu_limit)
 834         pa_assert_se(pa_cpu_limit_init(pa_mainloop_get_api(mainloop)) == 0);
 835
 836     buf = pa_strbuf_new();
 837     if (conf->load_default_script_file) {
 838         FILE *f;
 839
 840         if ((f = pa_daemon_conf_open_default_script_file(conf))) {
 841             r = pa_cli_command_execute_file_stream(c, f, buf, &conf->fail);
 842             fclose(f);
 843         }
 844     }
 845
 846     if (r >= 0)
 847         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 848
 849     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
 850     pa_xfree(s);
 851
 852     /* We completed the initial module loading, so let's disable it
 853      * from now on, if requested */
 854     c->disallow_module_loading = !!conf->disallow_module_loading;
 855
 856     if (r < 0 && conf->fail) {
 857         pa_log("Failed to initialize daemon.");
 858         goto finish;
 859     }
 860
 861     if (!c->modules || pa_idxset_size(c->modules) == 0) {
 862         pa_log("Daemon startup without any loaded modules, refusing to work.");
 863         goto finish;
 864     }
 865
 866     if (c->default_sink_name && !pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, TRUE) && conf->fail) {
 867         pa_log_error("Default sink name (%s) does not exist in name register.", c->default_sink_name);
 868         goto finish;
 869     }
 870
 871 #ifdef HAVE_FORK
 872     if (daemon_pipe[1] >= 0) {
 873         int ok = 0;
 874         pa_loop_write(daemon_pipe[1], &ok, sizeof(ok), NULL);
 875         pa_close(daemon_pipe[1]);
 876         daemon_pipe[1] = -1;
 877     }
 878 #endif
 879
 880     pa_log_info("Daemon startup complete.");
 881
 882     retval = 0;
 883     if (pa_mainloop_run(mainloop, &retval) < 0)
 884         goto finish;
 885
 886     pa_log_info("Daemon shutdown initiated.");
 887
 888 finish:
 889
 890     if (autospawn_lock_fd >= 0)
 891         pa_unlock_lockfile(lf, autospawn_lock_fd);
 892
 893     if (lf)
 894         pa_xfree(lf);
 895
 896 #ifdef OS_IS_WIN32
 897     if (win32_timer)
 898         pa_mainloop_get_api(mainloop)->time_free(win32_timer);
 899 #endif
 900
 901     if (c) {
 902         pa_core_unref(c);
 903         pa_log_info("Daemon terminated.");
 904     }
 905
 906     if (!conf->no_cpu_limit)
 907         pa_cpu_limit_done();
 908
 909     pa_signal_done();
 910
 911 #ifdef HAVE_FORK
 912     if (daemon_pipe[1] >= 0)
 913         pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 914
 915     pa_close_pipe(daemon_pipe);
 916 #endif
 917
 918     if (mainloop)
 919         pa_mainloop_free(mainloop);
 920
 921     if (conf)
 922         pa_daemon_conf_free(conf);
 923
 924     if (valid_pid_file)
 925         pa_pid_file_remove();
 926
 927 #ifdef OS_IS_WIN32
 928     WSACleanup();
 929 #endif
 930
 931     if (ltdl_init)
 932         pa_ltdl_done();
 933
 934 #ifdef HAVE_DBUS
 935     dbus_shutdown();
 936 #endif
 937
 938     return retval;
 939 }