vlc.c 8.07 KB
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/*****************************************************************************
 * vlc.c: the VLC player
 *****************************************************************************
 * Copyright (C) 1998-2008 the VideoLAN team
 * $Id$
 *
 * Authors: Vincent Seguin <seguin@via.ecp.fr>
 *          Samuel Hocevar <sam@zoy.org>
 *          Gildas Bazin <gbazin@videolan.org>
 *          Derk-Jan Hartman <hartman at videolan dot org>
 *          Lots of other people, see the libvlc AUTHORS file
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc/vlc.h>
#include <stdio.h>
#include <stdlib.h>
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#include <stdbool.h>
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#include <locale.h>
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#include <signal.h>
#include <time.h>
#include <pthread.h>
#include <unistd.h>
#include <dlfcn.h>
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#ifdef __APPLE__
#include <string.h>
#endif

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/* Explicit HACK */
extern void LocaleFree (const char *);
extern char *FromLocale (const char *);
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extern void vlc_enable_override (void);
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#ifdef HAVE_MAEMO
static void dummy_handler (int signum)
{
    (void) signum;
}
#endif

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static bool signal_ignored (int signum)
{
    struct sigaction sa;

    if (sigaction (signum, NULL, &sa))
        return false;
    return ((sa.sa_flags & SA_SIGINFO)
            ? (void *)sa.sa_sigaction : (void *)sa.sa_handler) == SIG_IGN;
}

static void vlc_kill (void *data)
{
    pthread_t *ps = data;

    pthread_kill (*ps, SIGTERM);
}

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static void exit_timeout (int signum)
{
    (void) signum;
    signal (SIGINT, SIG_DFL);
}
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/*****************************************************************************
 * main: parse command line, start interface and spawn threads.
 *****************************************************************************/
int main( int i_argc, const char *ppsz_argv[] )
{
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    /* The so-called POSIX-compliant MacOS X reportedly processes SIGPIPE even
     * if it is blocked in all thread. Also some libraries want SIGPIPE blocked
     * as they have no clue about signal masks.
     * Note: this is NOT an excuse for not protecting against SIGPIPE. If
     * LibVLC runs outside of VLC, we cannot rely on this code snippet. */
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    signal (SIGPIPE, SIG_IGN);
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    /* Restore default for SIGCHLD in case parent ignores it. */
    signal (SIGCHLD, SIG_DFL);
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#ifdef HAVE_SETENV
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# ifndef NDEBUG
    /* Activate malloc checking routines to detect heap corruptions. */
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    setenv ("MALLOC_CHECK_", "2", 1);
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    /* Disable the ugly Gnome crash dialog so that we properly segfault */
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    setenv ("GNOME_DISABLE_CRASH_DIALOG", "1", 1);
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# endif
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    /* Clear the X.Org startup notification ID. Otherwise the UI might try to
     * change the environment while the process is multi-threaded. That could
     * crash. Screw you X.Org. Next time write a thread-safe specification. */
    unsetenv ("DESKTOP_STARTUP_ID");
#endif
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#ifndef ALLOW_RUN_AS_ROOT
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    if (geteuid () == 0)
    {
        fprintf (stderr, "VLC is not supposed to be run as root. Sorry.\n"
        "If you need to use real-time priorities and/or privileged TCP ports\n"
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        "you can use %s-wrapper (make sure it is Set-UID root and\n"
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        "cannot be run by non-trusted users first).\n", ppsz_argv[0]);
        return 1;
    }
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#endif
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    setlocale (LC_ALL, "");

#ifndef __APPLE__
    /* This clutters OSX GUI error logs */
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    fprintf( stderr, "VLC media player %s (revision %s)\n",
             libvlc_get_version(), libvlc_get_changeset() );
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#endif

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    sigset_t set;

    sigemptyset (&set);
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    /* Synchronously intercepted POSIX signals.
     *
     * In a threaded program such as VLC, the only sane way to handle signals
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     * is to block them in all threads but one - this is the only way to
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     * predict which thread will receive them. If any piece of code depends
     * on delivery of one of this signal it is intrinsically not thread-safe
     * and MUST NOT be used in VLC, whether we like it or not.
     * There is only one exception: if the signal is raised with
     * pthread_kill() - we do not use this in LibVLC but some pthread
     * implementations use them internally. You should really use conditions
     * for thread synchronization anyway.
     *
     * Signal that request a clean shutdown, and force an unclean shutdown
     * if they are triggered again 2+ seconds later.
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     * We have to handle SIGTERM cleanly because of daemon mode. */
    sigaddset (&set, SIGINT);
    sigaddset (&set, SIGHUP);
    sigaddset (&set, SIGQUIT);
    sigaddset (&set, SIGTERM);

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    /* Signals that cause a no-op:
     * - SIGPIPE might happen with sockets and would crash VLC. It MUST be
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     *   blocked by any LibVLC-dependent application, not just VLC.
     * - SIGCHLD comes after exec*() (such as httpd CGI support) and must
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     *   be dequeued to cleanup zombie processes.
     */
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    sigaddset (&set, SIGPIPE);
    sigaddset (&set, SIGCHLD);
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#ifdef HAVE_MAEMO
    sigaddset (&set, SIGRTMIN);
    {
        struct sigaction act = { .sa_handler = dummy_handler, };
        sigaction (SIGRTMIN, &act, NULL);
    }
#endif
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    /* Block all these signals */
    pthread_sigmask (SIG_BLOCK, &set, NULL);

    /* Note that FromLocale() can be used before libvlc is initialized */
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    const char *argv[i_argc + 3];
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    int argc = 0;

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    argv[argc++] = "--no-ignore-config";
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#ifdef TOP_BUILDDIR
    argv[argc++] = FromLocale ("--plugin-path="TOP_BUILDDIR"/modules");
#endif
#ifdef TOP_SRCDIR
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    argv[argc++] = FromLocale ("--data-path="TOP_SRCDIR"/share");
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#endif

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    int i = 1;
#ifdef __APPLE__
    /* When VLC.app is run by double clicking in Mac OS X, the 2nd arg
     * is the PSN - process serial number (a unique PID-ish thingie)
     * still ok for real Darwin & when run from command line
     * for example -psn_0_9306113 */
    if(i_argc >= 2 && !strncmp( ppsz_argv[1] , "-psn" , 4 ))
        i = 2;
#endif
    for (; i < i_argc; i++)
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        if ((argv[argc++] = FromLocale (ppsz_argv[i])) == NULL)
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            return 1; // BOOM!
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    argv[argc] = NULL;
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    vlc_enable_override ();

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    /* Initialize libvlc */
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    libvlc_instance_t *vlc = libvlc_new (argc, argv);
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    if (vlc == NULL)
        goto out;
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    pthread_t self = pthread_self ();
    libvlc_set_exit_handler (vlc, vlc_kill, &self);
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    libvlc_set_user_agent (vlc, "VLC media player", NULL);
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#if !defined (HAVE_MAEMO) && !defined __APPLE__
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    libvlc_add_intf (vlc, "globalhotkeys,none");
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#endif
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    if (libvlc_add_intf (vlc, NULL))
        goto out;

    libvlc_playlist_play (vlc, -1, 0, NULL);
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    if (signal_ignored (SIGHUP)) /* <- needed to handle nohup properly */
        sigdelset (&set, SIGHUP);
    sigdelset (&set, SIGPIPE);

    int signum;
    do
        sigwait (&set, &signum);
    while (signum == SIGCHLD);

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    /* Restore default signal behaviour after 3 seconds */
    sigemptyset (&set);
    sigaddset (&set, SIGINT);
    sigaddset (&set, SIGALRM);
    signal (SIGINT, SIG_IGN);
    signal (SIGALRM, exit_timeout);
    pthread_sigmask (SIG_UNBLOCK, &set, NULL);
    alarm (3);

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    /* Cleanup */
out:
    if (vlc != NULL)
        libvlc_release (vlc);
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    for (int i = 1; i < argc; i++)
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        LocaleFree (argv[i]);
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#ifdef RTLD_NOLOAD
    /* Avoid crash in KIO scheduler cleanup. */
    /* This is ugly, but we get way too many crash reports due to this. */
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    if (dlopen ("libkio.so.5", RTLD_LAZY|RTLD_LOCAL|RTLD_NOLOAD) != NULL)
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    {
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        fprintf (stderr, "KIO present. Unclean shutdown!\n"
           " (see http://bugs.kde.org/show_bug.cgi?id=234484 for details)\n");
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        _exit (0);
    }
#endif
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    return 0;
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}