code.delx.au - pulseaudio/blob - polyp/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <memblock.h>
  36 #include <limits.h>
  37 #include <fcntl.h>
  38 #include <sys/ioctl.h>
  39
  40 #ifdef HAVE_LIBWRAP
  41 #include <syslog.h>
  42 #include <tcpd.h>
  43 #endif
  44
  45 #include "core.h"
  46 #include "mainloop.h"
  47 #include "module.h"
  48 #include "mainloop-signal.h"
  49 #include "cmdline.h"
  50 #include "cli-command.h"
  51 #include "util.h"
  52 #include "sioman.h"
  53 #include "xmalloc.h"
  54 #include "cpulimit.h"
  55 #include "log.h"
  56 #include "daemon-conf.h"
  57 #include "dumpmodules.h"
  58 #include "caps.h"
  59 #include "cli-text.h"
  60 #include "pid.h"
  61
  62 #ifdef HAVE_LIBWRAP
  63 /* Only one instance of these variables */
  64 int allow_severity = LOG_INFO;
  65 int deny_severity = LOG_WARNING;
  66 #endif
  67
  68 static void signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  69     pa_log_info(__FILE__": Got signal %s.\n", pa_strsignal(sig));
  70
  71     switch (sig) {
  72         case SIGUSR1:
  73             pa_module_load(userdata, "module-cli", NULL);
  74             break;
  75
  76         case SIGUSR2:
  77             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
  78             break;
  79
  80         case SIGHUP: {
  81             char *c = pa_full_status_string(userdata);
  82             pa_log_notice(c);
  83             pa_xfree(c);
  84             return;
  85         }
  86
  87         case SIGINT:
  88         case SIGTERM:
  89         default:
  90             pa_log_info(__FILE__": Exiting.\n");
  91             m->quit(m, 1);
  92             break;
  93     }
  94 }
  95
  96 static void close_pipe(int p[2]) {
  97     if (p[0] != -1)
  98         close(p[0]);
  99     if (p[1] != -1)
 100         close(p[1]);
 101     p[0] = p[1] = -1;
 102 }
 103
 104 int main(int argc, char *argv[]) {
 105     struct pa_core *c;
 106     struct pa_strbuf *buf = NULL;
 107     struct pa_daemon_conf *conf;
 108     struct pa_mainloop *mainloop;
 109
 110     char *s;
 111     int r, retval = 1, d = 0;
 112     int daemon_pipe[2] = { -1, -1 };
 113     gid_t gid = (gid_t) -1;
 114     int suid_root;
 115     int valid_pid_file = 0;
 116
 117     pa_limit_caps();
 118
 119     suid_root = getuid() != 0 && geteuid() == 0;
 120
 121     if (suid_root && (pa_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
 122         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.\n");
 123         pa_drop_root();
 124     }
 125
 126     LTDL_SET_PRELOADED_SYMBOLS();
 127
 128     r = lt_dlinit();
 129     assert(r == 0);
 130
 131     pa_log_set_ident("polypaudio");
 132
 133     conf = pa_daemon_conf_new();
 134
 135     if (pa_daemon_conf_load(conf, NULL) < 0)
 136         goto finish;
 137
 138     if (pa_daemon_conf_env(conf) < 0)
 139         goto finish;
 140
 141     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 142         pa_log(__FILE__": failed to parse command line.\n");
 143         goto finish;
 144     }
 145
 146     pa_log_set_maximal_level(conf->log_level);
 147     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 148
 149     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 150         pa_raise_priority();
 151
 152     pa_drop_caps();
 153
 154     if (suid_root)
 155         pa_drop_root();
 156
 157     if (conf->dl_search_path)
 158         lt_dlsetsearchpath(conf->dl_search_path);
 159
 160     switch (conf->cmd) {
 161         case PA_CMD_DUMP_MODULES:
 162             pa_dump_modules(conf, argc-d, argv+d);
 163             retval = 0;
 164             goto finish;
 165
 166         case PA_CMD_DUMP_CONF: {
 167             char *s = pa_daemon_conf_dump(conf);
 168             fputs(s, stdout);
 169             pa_xfree(s);
 170             retval = 0;
 171             goto finish;
 172         }
 173
 174         case PA_CMD_HELP :
 175             pa_cmdline_help(argv[0]);
 176             retval = 0;
 177             goto finish;
 178
 179         case PA_CMD_VERSION :
 180             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 181             retval = 0;
 182             goto finish;
 183
 184         case PA_CMD_CHECK: {
 185             pid_t pid;
 186
 187             if (pa_pid_file_check_running(&pid) < 0) {
 188                 pa_log_info(__FILE__": daemon not running\n");
 189             } else {
 190                 pa_log_info(__FILE__": daemon running as PID %u\n", pid);
 191                 retval = 0;
 192             }
 193
 194             goto finish;
 195
 196         }
 197         case PA_CMD_KILL:
 198
 199             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 200                 pa_log(__FILE__": failed to kill daemon.\n");
 201             else
 202                 retval = 0;
 203
 204             goto finish;
 205
 206         default:
 207             assert(conf->cmd == PA_CMD_DAEMON);
 208     }
 209
 210     if (conf->daemonize) {
 211         pid_t child;
 212         int tty_fd;
 213
 214         if (pa_stdio_acquire() < 0) {
 215             pa_log(__FILE__": failed to acquire stdio.\n");
 216             goto finish;
 217         }
 218
 219         if (pipe(daemon_pipe) < 0) {
 220             pa_log(__FILE__": failed to create pipe.\n");
 221             goto finish;
 222         }
 223
 224         if ((child = fork()) < 0) {
 225             pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 226             goto finish;
 227         }
 228
 229         if (child != 0) {
 230             /* Father */
 231
 232             close(daemon_pipe[1]);
 233             daemon_pipe[1] = -1;
 234
 235             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 236                 pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 237                 retval = 1;
 238             }
 239
 240             if (retval)
 241                 pa_log(__FILE__": daemon startup failed.\n");
 242             else
 243                 pa_log_info(__FILE__": daemon startup successful.\n");
 244
 245             goto finish;
 246         }
 247
 248         close(daemon_pipe[0]);
 249         daemon_pipe[0] = -1;
 250
 251         if (conf->auto_log_target)
 252             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 253
 254         setsid();
 255         setpgid(0,0);
 256
 257         close(0);
 258         close(1);
 259         close(2);
 260
 261         open("/dev/null", O_RDONLY);
 262         open("/dev/null", O_WRONLY);
 263         open("/dev/null", O_WRONLY);
 264
 265         signal(SIGTTOU, SIG_IGN);
 266         signal(SIGTTIN, SIG_IGN);
 267         signal(SIGTSTP, SIG_IGN);
 268
 269         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 270             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 271             close(tty_fd);
 272         }
 273     }
 274
 275     chdir("/");
 276
 277     if (conf->use_pid_file) {
 278         if (pa_pid_file_create() < 0) {
 279             if (conf->daemonize)
 280                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 281             goto finish;
 282         }
 283
 284         valid_pid_file = 1;
 285     }
 286
 287     mainloop = pa_mainloop_new();
 288     assert(mainloop);
 289
 290     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 291     assert(r == 0);
 292     pa_signal_new(SIGINT, signal_callback, c);
 293     pa_signal_new(SIGTERM, signal_callback, c);
 294     signal(SIGPIPE, SIG_IGN);
 295
 296     c = pa_core_new(pa_mainloop_get_api(mainloop));
 297     assert(c);
 298
 299     pa_signal_new(SIGUSR1, signal_callback, c);
 300     pa_signal_new(SIGUSR2, signal_callback, c);
 301     pa_signal_new(SIGHUP, signal_callback, c);
 302
 303     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 304     assert(r == 0);
 305
 306     buf = pa_strbuf_new();
 307     assert(buf);
 308     if (conf->default_script_file)
 309         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 310
 311     if (r >= 0)
 312         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 313     pa_log(s = pa_strbuf_tostring_free(buf));
 314     pa_xfree(s);
 315
 316     if (r < 0 && conf->fail) {
 317         pa_log(__FILE__": failed to initialize daemon.\n");
 318         if (conf->daemonize)
 319             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 320     } else if (!c->modules || pa_idxset_ncontents(c->modules) == 0) {
 321         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.\n");
 322         if (conf->daemonize)
 323             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 324     } else {
 325
 326         retval = 0;
 327         if (conf->daemonize)
 328             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 329
 330         c->disallow_module_loading = conf->disallow_module_loading;
 331         c->exit_idle_time = conf->exit_idle_time;
 332         c->module_idle_time = conf->module_idle_time;
 333         c->scache_idle_time = conf->scache_idle_time;
 334         c->resample_method = conf->resample_method;
 335
 336         pa_log_info(__FILE__": Daemon startup complete.\n");
 337         if (pa_mainloop_run(mainloop, &retval) < 0)
 338             retval = 1;
 339         pa_log_info(__FILE__": Daemon shutdown initiated.\n");
 340     }
 341
 342     pa_core_free(c);
 343
 344     pa_cpu_limit_done();
 345     pa_signal_done();
 346     pa_mainloop_free(mainloop);
 347
 348     pa_log_info(__FILE__": Daemon terminated.\n");
 349
 350 finish:
 351
 352     if (conf)
 353         pa_daemon_conf_free(conf);
 354
 355     if (valid_pid_file)
 356         pa_pid_file_remove();
 357
 358     close_pipe(daemon_pipe);
 359
 360     lt_dlexit();
 361
 362     return retval;
 363 }