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 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 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
  37 #include "core.h"
  38 #include "mainloop.h"
  39 #include "module.h"
  40 #include "mainloop-signal.h"
  41 #include "cmdline.h"
  42 #include "cli-command.h"
  43 #include "util.h"
  44 #include "sioman.h"
  45 #include "xmalloc.h"
  46 #include "cpulimit.h"
  47 #include "log.h"
  48 #include "conf.h"
  49 #include "dumpmodules.h"
  50
  51 static struct pa_mainloop *mainloop;
  52
  53 static void drop_root(void) {
  54     if (getuid() != 0 && geteuid() == 0) {
  55         pa_log(__FILE__": Started SUID root, dropping root rights.\n");
  56         setuid(getuid());
  57         seteuid(getuid());
  58     }
  59 }
  60
  61 static const char* signal_name(int s) {
  62     switch(s) {
  63         case SIGINT: return "SIGINT";
  64         case SIGTERM: return "SIGTERM";
  65         case SIGUSR1: return "SIGUSR1";
  66         case SIGUSR2: return "SIGUSR2";
  67         case SIGXCPU: return "SIGXCPU";
  68         case SIGPIPE: return "SIGPIPE";
  69         default: return "UNKNOWN SIGNAL";
  70     }
  71 }
  72
  73 static void signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  74     pa_log(__FILE__": Got signal %s.\n", signal_name(sig));
  75
  76     switch (sig) {
  77         case SIGUSR1:
  78             pa_module_load(userdata, "module-cli", NULL);
  79             return;
  80
  81         case SIGUSR2:
  82             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
  83             return;
  84
  85         case SIGINT:
  86         case SIGTERM:
  87         default:
  88             pa_log(__FILE__": Exiting.\n");
  89             m->quit(m, 1);
  90             return;
  91     }
  92 }
  93
  94 static void close_pipe(int p[2]) {
  95     if (p[0] != -1)
  96         close(p[0]);
  97     if (p[1] != -1)
  98         close(p[1]);
  99     p[0] = p[1] = -1;
 100 }
 101
 102 int main(int argc, char *argv[]) {
 103     struct pa_core *c;
 104     struct pa_strbuf *buf = NULL;
 105     struct pa_conf *conf;
 106     char *s;
 107     int r, retval = 1, d = 0;
 108     int daemon_pipe[2] = { -1, -1 };
 109
 110     r = lt_dlinit();
 111     assert(r == 0);
 112
 113     pa_log_set_ident("polypaudio");
 114
 115     conf = pa_conf_new();
 116
 117     if (pa_conf_load(conf, NULL) < 0)
 118         goto finish;
 119
 120     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 121         pa_log(__FILE__": failed to parse command line.\n");
 122         goto finish;
 123     }
 124
 125     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 126
 127     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 128         pa_raise_priority();
 129
 130     drop_root();
 131
 132     if (conf->dl_search_path)
 133         lt_dlsetsearchpath(conf->dl_search_path);
 134 #ifdef DLSEARCHPATH
 135     else
 136         lt_dlsetsearchpath(DLSEARCHPATH);
 137 #endif
 138
 139     switch (conf->cmd) {
 140         case PA_CMD_DUMP_MODULES:
 141             pa_dump_modules(conf, argc-d, argv+d);
 142             retval = 0;
 143             goto finish;
 144
 145         case PA_CMD_DUMP_CONF: {
 146             char *s = pa_conf_dump(conf);
 147             fputs(s, stdout);
 148             pa_xfree(s);
 149             retval = 0;
 150             goto finish;
 151         }
 152
 153         case PA_CMD_HELP :
 154             pa_cmdline_help(argv[0]);
 155             retval = 0;
 156             goto finish;
 157
 158         case PA_CMD_VERSION :
 159             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 160             retval = 0;
 161             goto finish;
 162
 163         default:
 164             assert(conf->cmd == PA_CMD_DAEMON);
 165     }
 166
 167     if (conf->daemonize) {
 168         pid_t child;
 169
 170         if (pa_stdio_acquire() < 0) {
 171             pa_log(__FILE__": failed to acquire stdio.\n");
 172             goto finish;
 173         }
 174
 175         if (pipe(daemon_pipe) < 0) {
 176             pa_log(__FILE__": failed to create pipe.\n");
 177             goto finish;
 178         }
 179
 180         if ((child = fork()) < 0) {
 181             pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 182             goto finish;
 183         }
 184
 185         if (child != 0) {
 186             /* Father */
 187
 188             close(daemon_pipe[1]);
 189             daemon_pipe[1] = -1;
 190
 191             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 192                 pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 193                 retval = 1;
 194             }
 195
 196             goto finish;
 197         }
 198
 199         close(daemon_pipe[0]);
 200         daemon_pipe[0] = -1;
 201
 202
 203         if (conf->auto_log_target)
 204             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 205
 206         setsid();
 207         setpgrp();
 208
 209         close(0);
 210         close(1);
 211     }
 212
 213
 214     pa_log(__FILE__": sizeof(pa_usec_t) = %u\n", sizeof(pa_usec_t));
 215
 216     mainloop = pa_mainloop_new();
 217     assert(mainloop);
 218
 219     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 220     assert(r == 0);
 221     pa_signal_new(SIGINT, signal_callback, c);
 222     pa_signal_new(SIGTERM, signal_callback, c);
 223     signal(SIGPIPE, SIG_IGN);
 224
 225     c = pa_core_new(pa_mainloop_get_api(mainloop));
 226     assert(c);
 227
 228     pa_signal_new(SIGUSR1, signal_callback, c);
 229     pa_signal_new(SIGUSR2, signal_callback, c);
 230
 231     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 232     assert(r == 0);
 233
 234     buf = pa_strbuf_new();
 235     assert(buf);
 236     if (conf->default_script_file)
 237         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail, &conf->verbose);
 238
 239     if (r >= 0)
 240         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail, &conf->verbose);
 241     pa_log(s = pa_strbuf_tostring_free(buf));
 242     pa_xfree(s);
 243
 244     if (r < 0 && conf->fail) {
 245         pa_log(__FILE__": failed to initialize daemon.\n");
 246         if (conf->daemonize)
 247             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 248     } else if (!c->modules || pa_idxset_ncontents(c->modules) == 0) {
 249         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.\n");
 250         if (conf->daemonize)
 251             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 252     } else {
 253         retval = 0;
 254         if (conf->daemonize)
 255             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 256
 257         c->disallow_module_loading = conf->disallow_module_loading;
 258         c->exit_idle_time = conf->exit_idle_time;
 259         c->module_idle_time = conf->module_idle_time;
 260
 261         pa_log(__FILE__": Daemon startup complete.\n");
 262         if (pa_mainloop_run(mainloop, &retval) < 0)
 263             retval = 1;
 264         pa_log(__FILE__": Daemon shutdown initiated.\n");
 265     }
 266
 267     pa_core_free(c);
 268
 269     pa_cpu_limit_done();
 270     pa_signal_done();
 271     pa_mainloop_free(mainloop);
 272
 273     pa_log(__FILE__": Daemon terminated.\n");
 274
 275 finish:
 276
 277     if (conf)
 278         pa_conf_free(conf);
 279
 280     close_pipe(daemon_pipe);
 281
 282     lt_dlexit();
 283
 284     return retval;
 285 }