bin/darwinvlc.c

   1 /*****************************************************************************
   2  * darwinvlc.c: the darwin-specific VLC player
   3  *****************************************************************************
   4  * Copyright (C) 1998-2013 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 <string.h>
  37 #include <locale.h>
  38 #include <signal.h>
  39 #ifdef HAVE_PTHREAD_H
  40 # include <pthread.h>
  41 #endif
  42 #include <unistd.h>
  43 #include <TargetConditionals.h>
  44 #import <CoreFoundation/CoreFoundation.h>
  45
  46 extern void vlc_enable_override (void);
  47
  48 static bool signal_ignored (int signum)
  49 {
  50     struct sigaction sa;
  51
  52     if (sigaction (signum, NULL, &sa))
  53         return false;
  54     return ((sa.sa_flags & SA_SIGINFO)
  55             ? (void *)sa.sa_sigaction : (void *)sa.sa_handler) == SIG_IGN;
  56 }
  57
  58 static void vlc_kill (void *data)
  59 {
  60     pthread_t *ps = data;
  61     pthread_kill (*ps, SIGTERM);
  62 }
  63
  64 static void exit_timeout (int signum)
  65 {
  66     (void) signum;
  67     signal (SIGINT, SIG_DFL);
  68 }
  69
  70 /*****************************************************************************
  71  * main: parse command line, start interface and spawn threads.
  72  *****************************************************************************/
  73 int main( int i_argc, const char *ppsz_argv[] )
  74 {
  75     /* The so-called POSIX-compliant MacOS X reportedly processes SIGPIPE even
  76      * if it is blocked in all thread.
  77      * Note: this is NOT an excuse for not protecting against SIGPIPE. If
  78      * LibVLC runs outside of VLC, we cannot rely on this code snippet. */
  79     signal (SIGPIPE, SIG_IGN);
  80     /* Restore SIGCHLD in case our parent process ignores it. */
  81     signal (SIGCHLD, SIG_DFL);
  82
  83 #ifndef NDEBUG
  84     /* Activate malloc checking routines to detect heap corruptions. */
  85     setenv ("MALLOC_CHECK_", "2", 1);
  86 #endif
  87
  88 #ifdef TOP_BUILDDIR
  89     setenv ("VLC_PLUGIN_PATH", TOP_BUILDDIR"/modules", 1);
  90     setenv ("VLC_DATA_PATH", TOP_SRCDIR"/share", 1);
  91 #endif
  92
  93 #ifndef ALLOW_RUN_AS_ROOT
  94     if (geteuid () == 0)
  95     {
  96         fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
  97         "If you need to use real-time priorities and/or privileged TCP ports\n"
  98         "you can use %s-wrapper (make sure it is Set-UID root and\n"
  99         "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
 100         return 1;
 101     }
 102 #endif
 103
 104     setlocale (LC_ALL, "");
 105
 106     if (isatty (STDERR_FILENO))
 107         /* This message clutters error logs. It is printed only on a TTY.
 108          * Fortunately, LibVLC prints version info with -vv anyway. */
 109         fprintf (stderr, "VLC media player %s (revision %s)\n",
 110                  libvlc_get_version(), libvlc_get_changeset());
 111
 112     sigset_t set;
 113
 114     sigemptyset (&set);
 115     /* VLC uses sigwait() to dequeue interesting signals.
 116      * For this to work, those signals must be blocked in all threads,
 117      * including the thread calling sigwait() (see the man page for details).
 118      *
 119      * There are two advantages to sigwait() over traditional signal handlers:
 120      *  - delivery is synchronous: no need to worry about async-safety,
 121      *  - EINTR is not generated: other threads need not handle that error.
 122      * That being said, some LibVLC programs do not use sigwait(). Therefore
 123      * EINTR must still be handled cleanly, notably from poll() calls.
 124      *
 125      * Signals that request a clean shutdown, and force an unclean shutdown
 126      * if they are triggered again 2+ seconds later.
 127      * We have to handle SIGTERM cleanly because of daemon mode. */
 128     sigaddset (&set, SIGINT);
 129     sigaddset (&set, SIGHUP);
 130     sigaddset (&set, SIGQUIT);
 131     sigaddset (&set, SIGTERM);
 132
 133     /* SIGPIPE can happen and would crash the process. On modern systems,
 134      * the MSG_NOSIGNAL flag protects socket write operations against SIGPIPE.
 135      * But we still need to block SIGPIPE when:
 136      *  - writing to pipes,
 137      *  - using write() instead of send() for code not specific to sockets.
 138      * LibVLC code assumes that SIGPIPE is blocked. Other LibVLC applications
 139      * shall block it (or handle it somehow) too.
 140      */
 141     sigaddset (&set, SIGPIPE);
 142
 143     /* SIGCHLD must be dequeued to clean up zombie child processes.
 144      * Furthermore the handler must not be set to SIG_IGN (see above).
 145      * We cannot pragmatically handle EINTR, short reads and short writes
 146      * in every code paths (including underlying libraries). So we just
 147      * block SIGCHLD in all threads, and dequeue it below. */
 148     sigaddset (&set, SIGCHLD);
 149
 150     /* Block all these signals */
 151     pthread_sigmask (SIG_SETMASK, &set, NULL);
 152
 153     const char *argv[i_argc + 2];
 154     int argc = 0;
 155
 156     argv[argc++] = "--no-ignore-config";
 157     argv[argc++] = "--media-library";
 158
 159     /* overwrite system language on Mac */
 160 #if !TARGET_OS_IPHONE && !TARGET_IPHONE_SIMULATOR // TARGET_OS_MAC is unspecific
 161     char *lang = NULL;
 162
 163     for (int i = 0; i < i_argc; i++) {
 164         if (!strncmp(ppsz_argv[i], "--language", 10)) {
 165             lang = strstr(ppsz_argv[i], "=");
 166             ppsz_argv++, i_argc--;
 167             continue;
 168         }
 169     }
 170     if (lang && strncmp( lang, "auto", 4 )) {
 171         char tmp[11];
 172         snprintf(tmp, 11, "LANG%s", lang);
 173         putenv(tmp);
 174     }
 175
 176     if (!lang) {
 177         CFStringRef language;
 178         language = (CFStringRef)CFPreferencesCopyAppValue(CFSTR("language"),
 179                                                           kCFPreferencesCurrentApplication);
 180         if (language) {
 181             CFIndex length = CFStringGetLength(language) + 1;
 182             if (length > 0) {
 183                 CFIndex maxSize = CFStringGetMaximumSizeForEncoding(length, kCFStringEncodingUTF8);
 184                 lang = (char *)malloc(maxSize);
 185                 CFStringGetCString(language, lang, maxSize - 1, kCFStringEncodingUTF8);
 186             }
 187             if (strncmp( lang, "auto", 4 )) {
 188                 char tmp[11];
 189                 snprintf(tmp, 11, "LANG=%s", lang);
 190                 putenv(tmp);
 191             }
 192             CFRelease(language);
 193         }
 194     }
 195 #endif
 196
 197     ppsz_argv++; i_argc--; /* skip executable path */
 198
 199     /* When VLC.app is run by double clicking in Mac OS X, the 2nd arg
 200      * is the PSN - process serial number (a unique PID-ish thingie)
 201      * still ok for real Darwin & when run from command line
 202      * for example -psn_0_9306113 */
 203     if (i_argc >= 1 && !strncmp (*ppsz_argv, "-psn" , 4))
 204         ppsz_argv++, i_argc--;
 205
 206     memcpy (argv + argc, ppsz_argv, i_argc * sizeof (*argv));
 207     argc += i_argc;
 208     argv[argc] = NULL;
 209
 210     vlc_enable_override ();
 211
 212     pthread_t self = pthread_self ();
 213
 214     /* Initialize libvlc */
 215     libvlc_instance_t *vlc = libvlc_new (argc, argv);
 216     if (vlc == NULL)
 217         return 1;
 218
 219     int ret = 1;
 220     libvlc_set_exit_handler (vlc, vlc_kill, &self);
 221     libvlc_set_app_id (vlc, "org.VideoLAN.VLC", PACKAGE_VERSION, PACKAGE_NAME);
 222     libvlc_set_user_agent (vlc, "VLC media player", "VLC/"PACKAGE_VERSION);
 223
 224     libvlc_add_intf (vlc, "hotkeys,none");
 225
 226     libvlc_playlist_play (vlc, -1, 0, NULL);
 227     if (libvlc_add_intf (vlc, NULL))
 228         goto out;
 229
 230     /* Qt4 insists on catching SIGCHLD via signal handler. To work around that,
 231      * unblock it after all our child threads are created. */
 232     sigdelset (&set, SIGCHLD);
 233     pthread_sigmask (SIG_SETMASK, &set, NULL);
 234
 235     /* Do not dequeue SIGHUP if it is ignored (nohup) */
 236     if (signal_ignored (SIGHUP))
 237         sigdelset (&set, SIGHUP);
 238     /* Ignore SIGPIPE */
 239     sigdelset (&set, SIGPIPE);
 240
 241     int signum;
 242     sigwait (&set, &signum);
 243
 244     /* Restore default signal behaviour after 3 seconds */
 245     sigemptyset (&set);
 246     sigaddset (&set, SIGINT);
 247     sigaddset (&set, SIGALRM);
 248     signal (SIGINT, SIG_IGN);
 249     signal (SIGALRM, exit_timeout);
 250     pthread_sigmask (SIG_UNBLOCK, &set, NULL);
 251     alarm (3);
 252
 253     ret = 0;
 254     /* Cleanup */
 255 out:
 256     libvlc_release (vlc);
 257
 258     return ret;
 259 }