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
  47 static struct pa_mainloop *mainloop;
  48
  49 static void drop_root(void) {
  50     if (getuid() != 0 && geteuid() == 0) {
  51         fprintf(stderr, __FILE__": started SUID root, dropping root rights.\n");
  52         setuid(getuid());
  53         seteuid(getuid());
  54     }
  55 }
  56
  57 static void exit_signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  58     m->quit(m, 1);
  59     fprintf(stderr, __FILE__": got signal.\n");
  60 }
  61
  62 static void aux_signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  63     struct pa_core *c = userdata;
  64     assert(c);
  65     pa_module_load(c, sig == SIGUSR1 ? "module-cli" : "module-cli-protocol-unix", NULL);
  66 }
  67
  68 static void close_pipe(int p[2]) {
  69     if (p[0] != -1)
  70         close(p[0]);
  71     if (p[1] != -1)
  72         close(p[1]);
  73     p[0] = p[1] = -1;
  74 }
  75
  76 int main(int argc, char *argv[]) {
  77     struct pa_core *c;
  78     struct pa_cmdline *cmdline = NULL;
  79     struct pa_strbuf *buf = NULL;
  80     char *s;
  81     int r, retval = 1;
  82     int daemon_pipe[2] = { -1, -1 };
  83
  84     if (!(cmdline = pa_cmdline_parse(argc, argv))) {
  85         fprintf(stderr, __FILE__": failed to parse command line.\n");
  86         goto finish;
  87     }
  88
  89     if (cmdline->help) {
  90         pa_cmdline_help(argv[0]);
  91         retval = 0;
  92         goto finish;
  93     }
  94
  95     if (cmdline->version) {
  96         printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
  97         retval = 0;
  98         goto finish;
  99     }
 100
 101     if (cmdline->high_priority)
 102         pa_raise_priority();
 103
 104     if (!cmdline->stay_root)
 105         drop_root();
 106
 107     if (cmdline->daemonize) {
 108         pid_t child;
 109
 110         if (pa_stdio_acquire() < 0) {
 111             fprintf(stderr, __FILE__": failed to acquire stdio.\n");
 112             goto finish;
 113         }
 114
 115         if (pipe(daemon_pipe) < 0) {
 116             fprintf(stderr, __FILE__": failed to create pipe.\n");
 117             goto finish;
 118         }
 119
 120         if ((child = fork()) < 0) {
 121             fprintf(stderr, __FILE__": fork() failed: %s\n", strerror(errno));
 122             goto finish;
 123         }
 124
 125         if (child != 0) {
 126             /* Father */
 127
 128             close(daemon_pipe[1]);
 129             daemon_pipe[1] = -1;
 130
 131             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 132                 fprintf(stderr, __FILE__": read() failed: %s\n", strerror(errno));
 133                 retval = 1;
 134             }
 135
 136             goto finish;
 137         }
 138
 139         close(daemon_pipe[0]);
 140         daemon_pipe[0] = -1;
 141
 142         setsid();
 143         setpgrp();
 144     }
 145
 146     r = lt_dlinit();
 147     assert(r == 0);
 148 #ifdef PA_DLSEARCHDIR
 149     lt_dladdsearchdir(PA_DLSEARCHDIR);
 150 #endif
 151
 152     mainloop = pa_mainloop_new();
 153     assert(mainloop);
 154
 155     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 156     assert(r == 0);
 157     pa_signal_new(SIGINT, exit_signal_callback, NULL);
 158     signal(SIGPIPE, SIG_IGN);
 159
 160     c = pa_core_new(pa_mainloop_get_api(mainloop));
 161     assert(c);
 162
 163     pa_signal_new(SIGUSR1, aux_signal_callback, c);
 164     pa_signal_new(SIGUSR2, aux_signal_callback, c);
 165
 166     buf = pa_strbuf_new();
 167     assert(buf);
 168     r = pa_cli_command_execute(c, cmdline->cli_commands, buf, &cmdline->fail, &cmdline->verbose);
 169     fprintf(stderr, s = pa_strbuf_tostring_free(buf));
 170     pa_xfree(s);
 171
 172     if (r < 0 && cmdline->fail) {
 173         fprintf(stderr, __FILE__": failed to initialize daemon.\n");
 174         if (cmdline->daemonize)
 175             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 176     } else if (!c->modules || pa_idxset_ncontents(c->modules) == 0) {
 177         fprintf(stderr, __FILE__": daemon startup without any loaded modules, refusing to work.\n");
 178         if (cmdline->daemonize)
 179             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 180     } else {
 181         retval = 0;
 182         if (cmdline->daemonize)
 183             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 184         fprintf(stderr, __FILE__": mainloop entry.\n");
 185         if (pa_mainloop_run(mainloop, &retval) < 0)
 186             retval = 1;
 187         fprintf(stderr, __FILE__": mainloop exit.\n");
 188     }
 189
 190     pa_core_free(c);
 191
 192     pa_signal_done();
 193     pa_mainloop_free(mainloop);
 194
 195     lt_dlexit();
 196
 197 finish:
 198
 199     if (cmdline)
 200         pa_cmdline_free(cmdline);
 201
 202     close_pipe(daemon_pipe);
 203
 204     return retval;
 205 }