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 <locale.h>
  36
  37 #ifdef __APPLE__
  38 #include <string.h>
  39 #endif
  40
  41
  42 /* Explicit HACK */
  43 extern void LocaleFree (const char *);
  44 extern char *FromLocale (const char *);
  45 extern void vlc_enable_override (void);
  46
  47 #include <signal.h>
  48 #include <time.h>
  49 #include <pthread.h>
  50 #include <unistd.h>
  51 #include <dlfcn.h>
  52
  53 #ifdef HAVE_MAEMO
  54 static void dummy_handler (int signum)
  55 {
  56     (void) signum;
  57 }
  58 #endif
  59
  60 /*****************************************************************************
  61  * main: parse command line, start interface and spawn threads.
  62  *****************************************************************************/
  63 int main( int i_argc, const char *ppsz_argv[] )
  64 {
  65     /* The so-called POSIX-compliant MacOS X reportedly processes SIGPIPE even
  66      * if it is blocked in all thread. Also some libraries want SIGPIPE blocked
  67      * as they have no clue about signal masks.
  68      * Note: this is NOT an excuse for not protecting against SIGPIPE. If
  69      * LibVLC runs outside of VLC, we cannot rely on this code snippet. */
  70     signal (SIGPIPE, SIG_IGN);
  71
  72 #ifdef HAVE_SETENV
  73 # ifndef NDEBUG
  74     /* Activate malloc checking routines to detect heap corruptions. */
  75     setenv ("MALLOC_CHECK_", "2", 1);
  76
  77     /* Disable the ugly Gnome crash dialog so that we properly segfault */
  78     setenv ("GNOME_DISABLE_CRASH_DIALOG", "1", 1);
  79 # endif
  80
  81     /* Make Xlib hide visuals with an alphachannel. Ensure that Qt4 will not
  82      * use the alpha channel for the embedded video window. */
  83     setenv ("XLIB_SKIP_ARGB_VISUALS", "1", 1);
  84
  85     /* Clear the X.Org startup notification ID. Otherwise the UI might try to
  86      * change the environment while the process is multi-threaded. That could
  87      * crash. Screw you X.Org. Next time write a thread-safe specification. */
  88     unsetenv ("DESKTOP_STARTUP_ID");
  89 #endif
  90
  91 #ifndef ALLOW_RUN_AS_ROOT
  92     if (geteuid () == 0)
  93     {
  94         fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
  95         "If you need to use real-time priorities and/or privileged TCP ports\n"
  96         "you can use %s-wrapper (make sure it is Set-UID root and\n"
  97         "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
  98         return 1;
  99     }
 100 #endif
 101
 102     setlocale (LC_ALL, "");
 103
 104 #ifndef __APPLE__
 105     /* This clutters OSX GUI error logs */
 106     fprintf( stderr, "VLC media player %s (revision %s)\n",
 107              libvlc_get_version(), libvlc_get_changeset() );
 108 #endif
 109
 110     /* Synchronously intercepted POSIX signals.
 111      *
 112      * In a threaded program such as VLC, the only sane way to handle signals
 113      * is to block them in all threads but one - this is the only way to
 114      * predict which thread will receive them. If any piece of code depends
 115      * on delivery of one of this signal it is intrinsically not thread-safe
 116      * and MUST NOT be used in VLC, whether we like it or not.
 117      * There is only one exception: if the signal is raised with
 118      * pthread_kill() - we do not use this in LibVLC but some pthread
 119      * implementations use them internally. You should really use conditions
 120      * for thread synchronization anyway.
 121      *
 122      * Signal that request a clean shutdown, and force an unclean shutdown
 123      * if they are triggered again 2+ seconds later.
 124      * We have to handle SIGTERM cleanly because of daemon mode.
 125      * Note that we set the signals after the vlc_create call. */
 126     static const int sigs[] = {
 127         SIGINT, SIGHUP, SIGQUIT, SIGTERM,
 128     /* Signals that cause a no-op:
 129      * - SIGPIPE might happen with sockets and would crash VLC. It MUST be
 130      *   blocked by any LibVLC-dependent application, not just VLC.
 131      * - SIGCHLD comes after exec*() (such as httpd CGI support) and must
 132      *   be dequeued to cleanup zombie processes.
 133      */
 134         SIGPIPE, SIGCHLD
 135     };
 136
 137     sigset_t set;
 138     sigemptyset (&set);
 139     for (unsigned i = 0; i < sizeof (sigs) / sizeof (sigs[0]); i++)
 140         sigaddset (&set, sigs[i]);
 141 #ifdef HAVE_MAEMO
 142     sigaddset (&set, SIGRTMIN);
 143     {
 144         struct sigaction act = { .sa_handler = dummy_handler, };
 145         sigaction (SIGRTMIN, &act, NULL);
 146     }
 147 #endif
 148
 149     /* Block all these signals */
 150     pthread_sigmask (SIG_BLOCK, &set, NULL);
 151     sigdelset (&set, SIGPIPE);
 152     sigdelset (&set, SIGCHLD);
 153
 154     /* Note that FromLocale() can be used before libvlc is initialized */
 155     const char *argv[i_argc + 3];
 156     int argc = 0;
 157
 158     argv[argc++] = "--no-ignore-config";
 159 #ifdef TOP_BUILDDIR
 160     argv[argc++] = FromLocale ("--plugin-path="TOP_BUILDDIR"/modules");
 161 #endif
 162 #ifdef TOP_SRCDIR
 163     argv[argc++] = FromLocale ("--data-path="TOP_SRCDIR"/share");
 164 #endif
 165
 166     int i = 1;
 167 #ifdef __APPLE__
 168     /* When VLC.app is run by double clicking in Mac OS X, the 2nd arg
 169      * is the PSN - process serial number (a unique PID-ish thingie)
 170      * still ok for real Darwin & when run from command line
 171      * for example -psn_0_9306113 */
 172     if(i_argc >= 2 && !strncmp( ppsz_argv[1] , "-psn" , 4 ))
 173         i = 2;
 174 #endif
 175     for (; i < i_argc; i++)
 176         if ((argv[argc++] = FromLocale (ppsz_argv[i])) == NULL)
 177             return 1; // BOOM!
 178     argv[argc] = NULL;
 179
 180     vlc_enable_override ();
 181
 182     /* Initialize libvlc */
 183     libvlc_instance_t *vlc = libvlc_new (argc, argv);
 184
 185     if (vlc != NULL)
 186     {
 187         if (libvlc_add_intf (vlc, "signals"))
 188             pthread_sigmask (SIG_UNBLOCK, &set, NULL);
 189 #if !defined (HAVE_MAEMO)
 190         libvlc_add_intf (vlc, "globalhotkeys,none");
 191 #endif
 192         if (libvlc_add_intf (vlc, NULL) == 0)
 193         {
 194             libvlc_playlist_play (vlc, -1, 0, NULL);
 195             libvlc_wait (vlc);
 196         }
 197         libvlc_release (vlc);
 198     }
 199
 200     for (int i = 1; i < argc; i++)
 201         LocaleFree (argv[i]);
 202
 203 #ifdef RTLD_NOLOAD
 204     /* Avoid crash in KIO scheduler cleanup. */
 205     /* This is ugly, but we get way too many crash reports due to this. */
 206     if (dlopen ("libkfilemodule.so", RTLD_LAZY|RTLD_LOCAL|RTLD_NOLOAD) != NULL)
 207     {
 208         fprintf (stderr, "KFile plugin present. Unclean shutdown!\n");
 209         _exit (0);
 210     }
 211 #endif
 212     return 0;
 213 }