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 <time.h>
  39 #include <pthread.h>
  40 #include <unistd.h>
  41 #include <dlfcn.h>
  42
  43 #ifdef __APPLE__
  44 #include <string.h>
  45 #endif
  46
  47
  48 /* Explicit HACK */
  49 extern void LocaleFree (const char *);
  50 extern char *FromLocale (const char *);
  51 extern void vlc_enable_override (void);
  52
  53 #ifdef HAVE_MAEMO
  54 static void dummy_handler (int signum)
  55 {
  56     (void) signum;
  57 }
  58 #endif
  59
  60 static bool signal_ignored (int signum)
  61 {
  62     struct sigaction sa;
  63
  64     if (sigaction (signum, NULL, &sa))
  65         return false;
  66     return ((sa.sa_flags & SA_SIGINFO)
  67             ? (void *)sa.sa_sigaction : (void *)sa.sa_handler) == SIG_IGN;
  68 }
  69
  70 static void vlc_kill (void *data)
  71 {
  72     pthread_t *ps = data;
  73
  74     pthread_kill (*ps, SIGTERM);
  75 }
  76
  77 static void exit_timeout (int signum)
  78 {
  79     (void) signum;
  80     signal (SIGINT, SIG_DFL);
  81 }
  82
  83 /*****************************************************************************
  84  * main: parse command line, start interface and spawn threads.
  85  *****************************************************************************/
  86 int main( int i_argc, const char *ppsz_argv[] )
  87 {
  88     /* The so-called POSIX-compliant MacOS X reportedly processes SIGPIPE even
  89      * if it is blocked in all thread. Also some libraries want SIGPIPE blocked
  90      * as they have no clue about signal masks.
  91      * Note: this is NOT an excuse for not protecting against SIGPIPE. If
  92      * LibVLC runs outside of VLC, we cannot rely on this code snippet. */
  93     signal (SIGPIPE, SIG_IGN);
  94     /* Restore default for SIGCHLD in case parent ignores it. */
  95     signal (SIGCHLD, SIG_DFL);
  96
  97 #ifdef HAVE_SETENV
  98 # ifndef NDEBUG
  99     /* Activate malloc checking routines to detect heap corruptions. */
 100     setenv ("MALLOC_CHECK_", "2", 1);
 101
 102     /* Disable the ugly Gnome crash dialog so that we properly segfault */
 103     setenv ("GNOME_DISABLE_CRASH_DIALOG", "1", 1);
 104 # endif
 105
 106     /* Clear the X.Org startup notification ID. Otherwise the UI might try to
 107      * change the environment while the process is multi-threaded. That could
 108      * crash. Screw you X.Org. Next time write a thread-safe specification. */
 109     unsetenv ("DESKTOP_STARTUP_ID");
 110 #endif
 111
 112 #ifndef ALLOW_RUN_AS_ROOT
 113     if (geteuid () == 0)
 114     {
 115         fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
 116         "If you need to use real-time priorities and/or privileged TCP ports\n"
 117         "you can use %s-wrapper (make sure it is Set-UID root and\n"
 118         "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
 119         return 1;
 120     }
 121 #endif
 122
 123     setlocale (LC_ALL, "");
 124
 125 #ifndef __APPLE__
 126     /* This clutters OSX GUI error logs */
 127     fprintf( stderr, "VLC media player %s (revision %s)\n",
 128              libvlc_get_version(), libvlc_get_changeset() );
 129 #endif
 130
 131     sigset_t set;
 132
 133     sigemptyset (&set);
 134     /* Synchronously intercepted POSIX signals.
 135      *
 136      * In a threaded program such as VLC, the only sane way to handle signals
 137      * is to block them in all threads but one - this is the only way to
 138      * predict which thread will receive them. If any piece of code depends
 139      * on delivery of one of this signal it is intrinsically not thread-safe
 140      * and MUST NOT be used in VLC, whether we like it or not.
 141      * There is only one exception: if the signal is raised with
 142      * pthread_kill() - we do not use this in LibVLC but some pthread
 143      * implementations use them internally. You should really use conditions
 144      * for thread synchronization anyway.
 145      *
 146      * Signal that request a clean shutdown, and force an unclean shutdown
 147      * if they are triggered again 2+ seconds later.
 148      * We have to handle SIGTERM cleanly because of daemon mode. */
 149     sigaddset (&set, SIGINT);
 150     sigaddset (&set, SIGHUP);
 151     sigaddset (&set, SIGQUIT);
 152     sigaddset (&set, SIGTERM);
 153
 154     /* Signals that cause a no-op:
 155      * - SIGPIPE might happen with sockets and would crash VLC. It MUST be
 156      *   blocked by any LibVLC-dependent application, not just VLC.
 157      * - SIGCHLD comes after exec*() (such as httpd CGI support) and must
 158      *   be dequeued to cleanup zombie processes.
 159      */
 160     sigaddset (&set, SIGPIPE);
 161     sigaddset (&set, SIGCHLD);
 162
 163 #ifdef HAVE_MAEMO
 164     sigaddset (&set, SIGRTMIN);
 165     {
 166         struct sigaction act = { .sa_handler = dummy_handler, };
 167         sigaction (SIGRTMIN, &act, NULL);
 168     }
 169 #endif
 170     /* Block all these signals */
 171     pthread_sigmask (SIG_BLOCK, &set, NULL);
 172
 173     /* Note that FromLocale() can be used before libvlc is initialized */
 174     const char *argv[i_argc + 4];
 175     int argc = 0;
 176
 177     argv[argc++] = "--no-ignore-config";
 178     argv[argc++] = "--media-library";
 179 #ifdef TOP_BUILDDIR
 180     argv[argc++] = FromLocale ("--plugin-path="TOP_BUILDDIR"/modules");
 181 #endif
 182 #ifdef TOP_SRCDIR
 183     argv[argc++] = FromLocale ("--data-path="TOP_SRCDIR"/share");
 184 #endif
 185
 186     int i = 1;
 187 #ifdef __APPLE__
 188     /* When VLC.app is run by double clicking in Mac OS X, the 2nd arg
 189      * is the PSN - process serial number (a unique PID-ish thingie)
 190      * still ok for real Darwin & when run from command line
 191      * for example -psn_0_9306113 */
 192     if(i_argc >= 2 && !strncmp( ppsz_argv[1] , "-psn" , 4 ))
 193         i = 2;
 194 #endif
 195     for (; i < i_argc; i++)
 196         if ((argv[argc++] = FromLocale (ppsz_argv[i])) == NULL)
 197             return 1; // BOOM!
 198     argv[argc] = NULL;
 199
 200     vlc_enable_override ();
 201
 202     /* Initialize libvlc */
 203     libvlc_instance_t *vlc = libvlc_new (argc, argv);
 204     if (vlc == NULL)
 205         goto out;
 206
 207     libvlc_set_user_agent (vlc, "VLC media player", "VLC/"PACKAGE_VERSION);
 208
 209 #if !defined (HAVE_MAEMO) && !defined __APPLE__
 210     libvlc_add_intf (vlc, "globalhotkeys,none");
 211 #endif
 212     if (libvlc_add_intf (vlc, NULL))
 213         goto out;
 214
 215     libvlc_playlist_play (vlc, -1, 0, NULL);
 216
 217     /* Wait for a termination signal */
 218     pthread_t self = pthread_self ();
 219     libvlc_set_exit_handler (vlc, vlc_kill, &self);
 220
 221     if (signal_ignored (SIGHUP)) /* <- needed to handle nohup properly */
 222         sigdelset (&set, SIGHUP);
 223     sigdelset (&set, SIGPIPE);
 224
 225     int signum;
 226     do
 227         sigwait (&set, &signum);
 228     while (signum == SIGCHLD);
 229
 230     /* Restore default signal behaviour after 3 seconds */
 231     sigemptyset (&set);
 232     sigaddset (&set, SIGINT);
 233     sigaddset (&set, SIGALRM);
 234     signal (SIGINT, SIG_IGN);
 235     signal (SIGALRM, exit_timeout);
 236     pthread_sigmask (SIG_UNBLOCK, &set, NULL);
 237     alarm (3);
 238
 239     /* Cleanup */
 240 out:
 241     if (vlc != NULL)
 242         libvlc_release (vlc);
 243     for (int i = 1; i < argc; i++)
 244         LocaleFree (argv[i]);
 245
 246     /* Do not run exit handlers. Some of them are buggy (e.g. KDE IO scheduler)
 247      * and crash. Also some will crash because their library may be already
 248      * unloaded (dlclose()). */
 249     _exit (0);
 250 }