bin/vlc.c

   1 /*****************************************************************************
   2  * vlc.c: the VLC player
   3  *****************************************************************************
   4  * Copyright (C) 1998-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *          Derk-Jan Hartman <hartman at videolan dot org>
  11  *          Lots of other people, see the libvlc AUTHORS file
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc/vlc.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <stdbool.h>
  36 #include <locale.h>
  37 #include <signal.h>
  38 #include <pthread.h>
  39 #include <unistd.h>
  40
  41 #ifdef __APPLE__
  42 #include <string.h>
  43 #endif
  44
  45
  46 /* Explicit HACK */
  47 extern void LocaleFree (const char *);
  48 extern char *FromLocale (const char *);
  49 extern void vlc_enable_override (void);
  50
  51 #ifdef HAVE_MAEMO
  52 static void dummy_handler (int signum)
  53 {
  54     (void) signum;
  55 }
  56 #endif
  57
  58 static bool signal_ignored (int signum)
  59 {
  60     struct sigaction sa;
  61
  62     if (sigaction (signum, NULL, &sa))
  63         return false;
  64     return ((sa.sa_flags & SA_SIGINFO)
  65             ? (void *)sa.sa_sigaction : (void *)sa.sa_handler) == SIG_IGN;
  66 }
  67
  68 static void vlc_kill (void *data)
  69 {
  70     pthread_t *ps = data;
  71
  72     pthread_kill (*ps, SIGTERM);
  73 }
  74
  75 static void exit_timeout (int signum)
  76 {
  77     (void) signum;
  78     signal (SIGINT, SIG_DFL);
  79 }
  80
  81 /*****************************************************************************
  82  * main: parse command line, start interface and spawn threads.
  83  *****************************************************************************/
  84 int main( int i_argc, const char *ppsz_argv[] )
  85 {
  86     /* The so-called POSIX-compliant MacOS X reportedly processes SIGPIPE even
  87      * if it is blocked in all thread. Also some libraries want SIGPIPE blocked
  88      * as they have no clue about signal masks.
  89      * Note: this is NOT an excuse for not protecting against SIGPIPE. If
  90      * LibVLC runs outside of VLC, we cannot rely on this code snippet. */
  91     signal (SIGPIPE, SIG_IGN);
  92     /* Restore default for SIGCHLD in case parent ignores it. */
  93     signal (SIGCHLD, SIG_DFL);
  94
  95 #ifdef HAVE_SETENV
  96 # ifndef NDEBUG
  97     /* Activate malloc checking routines to detect heap corruptions. */
  98     setenv ("MALLOC_CHECK_", "2", 1);
  99
 100     /* Disable the ugly Gnome crash dialog so that we properly segfault */
 101     setenv ("GNOME_DISABLE_CRASH_DIALOG", "1", 1);
 102 # endif
 103
 104     /* Clear the X.Org startup notification ID. Otherwise the UI might try to
 105      * change the environment while the process is multi-threaded. That could
 106      * crash. Screw you X.Org. Next time write a thread-safe specification. */
 107     unsetenv ("DESKTOP_STARTUP_ID");
 108 #endif
 109
 110 #ifndef ALLOW_RUN_AS_ROOT
 111     if (geteuid () == 0)
 112     {
 113         fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
 114         "If you need to use real-time priorities and/or privileged TCP ports\n"
 115         "you can use %s-wrapper (make sure it is Set-UID root and\n"
 116         "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
 117         return 1;
 118     }
 119 #endif
 120
 121     setlocale (LC_ALL, "");
 122
 123 #ifndef __APPLE__
 124     /* This clutters OSX GUI error logs */
 125     fprintf( stderr, "VLC media player %s (revision %s)\n",
 126              libvlc_get_version(), libvlc_get_changeset() );
 127 #endif
 128
 129     sigset_t set;
 130
 131     sigemptyset (&set);
 132     /* Synchronously intercepted POSIX signals.
 133      *
 134      * In a threaded program such as VLC, the only sane way to handle signals
 135      * is to block them in all threads but one - this is the only way to
 136      * predict which thread will receive them. If any piece of code depends
 137      * on delivery of one of this signal it is intrinsically not thread-safe
 138      * and MUST NOT be used in VLC, whether we like it or not.
 139      * There is only one exception: if the signal is raised with
 140      * pthread_kill() - we do not use this in LibVLC but some pthread
 141      * implementations use them internally. You should really use conditions
 142      * for thread synchronization anyway.
 143      *
 144      * Signal that request a clean shutdown, and force an unclean shutdown
 145      * if they are triggered again 2+ seconds later.
 146      * We have to handle SIGTERM cleanly because of daemon mode. */
 147     sigaddset (&set, SIGINT);
 148     sigaddset (&set, SIGHUP);
 149     sigaddset (&set, SIGQUIT);
 150     sigaddset (&set, SIGTERM);
 151
 152     /* Signals that cause a no-op:
 153      * - SIGPIPE might happen with sockets and would crash VLC. It MUST be
 154      *   blocked by any LibVLC-dependent application, not just VLC.
 155      * - SIGCHLD comes after exec*() (such as httpd CGI support) and must
 156      *   be dequeued to cleanup zombie processes.
 157      */
 158     sigaddset (&set, SIGPIPE);
 159     sigaddset (&set, SIGCHLD);
 160
 161 #ifdef HAVE_MAEMO
 162     sigaddset (&set, SIGRTMIN);
 163     {
 164         struct sigaction act = { .sa_handler = dummy_handler, };
 165         sigaction (SIGRTMIN, &act, NULL);
 166     }
 167 #endif
 168     /* Block all these signals */
 169     pthread_sigmask (SIG_BLOCK, &set, NULL);
 170
 171     /* Note that FromLocale() can be used before libvlc is initialized */
 172     const char *argv[i_argc + 4];
 173     int argc = 0;
 174
 175     argv[argc++] = "--no-ignore-config";
 176     argv[argc++] = "--media-library";
 177 #ifdef TOP_BUILDDIR
 178     argv[argc++] = FromLocale ("--plugin-path="TOP_BUILDDIR"/modules");
 179 #endif
 180 #ifdef TOP_SRCDIR
 181     argv[argc++] = FromLocale ("--data-path="TOP_SRCDIR"/share");
 182 #endif
 183
 184     int i = 1;
 185 #ifdef __APPLE__
 186     /* When VLC.app is run by double clicking in Mac OS X, the 2nd arg
 187      * is the PSN - process serial number (a unique PID-ish thingie)
 188      * still ok for real Darwin & when run from command line
 189      * for example -psn_0_9306113 */
 190     if(i_argc >= 2 && !strncmp( ppsz_argv[1] , "-psn" , 4 ))
 191         i = 2;
 192 #endif
 193     for (; i < i_argc; i++)
 194         if ((argv[argc++] = FromLocale (ppsz_argv[i])) == NULL)
 195             return 1; // BOOM!
 196     argv[argc] = NULL;
 197
 198     vlc_enable_override ();
 199
 200     /* Initialize libvlc */
 201     libvlc_instance_t *vlc = libvlc_new (argc, argv);
 202     if (vlc == NULL)
 203         goto out;
 204
 205     libvlc_set_user_agent (vlc, "VLC media player", "VLC/"PACKAGE_VERSION);
 206
 207 #if !defined (HAVE_MAEMO) && !defined __APPLE__
 208     libvlc_add_intf (vlc, "globalhotkeys,none");
 209 #endif
 210     if (libvlc_add_intf (vlc, NULL))
 211         goto out;
 212
 213     libvlc_playlist_play (vlc, -1, 0, NULL);
 214
 215     /* Wait for a termination signal */
 216     pthread_t self = pthread_self ();
 217     libvlc_set_exit_handler (vlc, vlc_kill, &self);
 218
 219     if (signal_ignored (SIGHUP)) /* <- needed to handle nohup properly */
 220         sigdelset (&set, SIGHUP);
 221     sigdelset (&set, SIGPIPE);
 222
 223     int signum;
 224     do
 225         sigwait (&set, &signum);
 226     while (signum == SIGCHLD);
 227
 228     /* Restore default signal behaviour after 3 seconds */
 229     sigemptyset (&set);
 230     sigaddset (&set, SIGINT);
 231     sigaddset (&set, SIGALRM);
 232     signal (SIGINT, SIG_IGN);
 233     signal (SIGALRM, exit_timeout);
 234     pthread_sigmask (SIG_UNBLOCK, &set, NULL);
 235     alarm (3);
 236
 237     /* Cleanup */
 238 out:
 239     if (vlc != NULL)
 240         libvlc_release (vlc);
 241     for (int i = 1; i < argc; i++)
 242         LocaleFree (argv[i]);
 243
 244     /* Do not run exit handlers. Some of them are buggy (e.g. KDE IO scheduler)
 245      * and crash. Also some will crash because their library may be already
 246      * unloaded (dlclose()). */
 247     _exit (0);
 248 }