[vlc-devel] Re: can't call fork() in vlc.c
Sooyoung Sung
maximus at cmu.edu
Tue Apr 6 18:14:22 CEST 2004
Hi,
here is a copy of the code.
Basically, I am trying to fork an application which grabs stream from a
stream server and feeds it into VLC.
Thanks.
/*****************************************************************************
* vlc.c: the vlc player
*****************************************************************************
* Copyright (C) 1998-2004 VideoLAN
* $Id: vlc.c,v 1.21 2004/01/25 17:16:05 zorglub Exp $
*
* Authors: Vincent Seguin <seguin at via.ecp.fr>
* Samuel Hocevar <sam at zoy.org>
* Gildas Bazin <gbazin at netcourrier.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#include "config.h"
#include <stdio.h> /*
fprintf() */
#include <stdlib.h> /* putenv(),
strtol(), */
#ifdef HAVE_SIGNAL_H
# include <signal.h> /* SIGHUP, SIGINT,
SIGKILL */
#endif
#ifdef HAVE_TIME_H
# include <time.h> /*
time() */
#endif
#include <vlc/vlc.h>
#include <sys/types.h>
#include <unistd.h>
/*****************************************************************************
* Local prototypes.
*****************************************************************************/
#ifndef WIN32
static void SigHandler ( int i_signal );
#endif
/*****************************************************************************
* main: parse command line, start interface and spawn threads
*****************************************************************************/
int main( int i_argc, char *ppsz_argv[] )
{
int i_ret;
fprintf( stderr, "VLC media player %s\n", VLC_Version() );
#ifdef HAVE_PUTENV
# ifdef DEBUG
/* Activate malloc checking routines to detect heap corruptions. */
putenv( "MALLOC_CHECK_=2" );
/* Disable the ugly Gnome crash dialog so that we properly segfault */
putenv( "GNOME_DISABLE_CRASH_DIALOG=1" );
# endif
/* If the user isn't using VLC_VERBOSE, set it to 0 by default */
if( getenv( "VLC_VERBOSE" ) == NULL )
{
putenv( "VLC_VERBOSE=0" );
}
#endif
int esmproxy_pid;
if (!(esmproxy_pid=fork()))
{
const char *filename = "C:/PROGRA~1/CMU/ESM/proxy";
const char *params[1] = {"-uid 4 -eid 207 -a 9821 -v 2 -S 1200 -P
9800 -p 9800 -Q 9810 -T tcp -w 65535 -M BW_LATENCY -logdir
/usr3/demo/2004.03.19.10.59.05.tcp.420.WEB_HOSTSET.BW_LATENCY_
RTT.51.228.0.0.AIAD.Multiple.Priority -ResourceRate Multiple
-ResourceAllocate Priority -l 420 -u AIAD:3000:100 -j 0 -i 0 -y
23450:20+23452:100+23454:300 -x 23650:23652 -e 128.2.220.47:982 3 -e
128.2.220.47:9824 -e 128.2.220.47:9825 -n 9820 -O 128.2.220.121 -o
9811 -B RTT -Y 127.0.0.1 -m 128.2.220.43 -A 128.2.220.43 -C
128.2.220.43 -q 0 -U sooyoungtest.11.00.02.on.log"};
execvp(filename, params);
exit(0);
}
/* Create a libvlc structure */
i_ret = VLC_Create();
if( i_ret < 0 )
{
return i_ret;
}
#ifndef WIN32
/* Set the signal handlers. SIGTERM is not intercepted, because we
need at
* least one method to kill the program when all other methods failed,
and
* when we don't want to use SIGKILL.
* Note that we set the signals after the vlc_create call. */
signal( SIGINT, SigHandler );
signal( SIGHUP, SigHandler );
signal( SIGQUIT, SigHandler );
/* Other signals */
signal( SIGALRM, SIG_IGN );
signal( SIGPIPE, SIG_IGN );
#endif
/* Initialize libvlc */
i_ret = VLC_Init( 0, i_argc, ppsz_argv );
if( i_ret < 0 )
{
VLC_Destroy( 0 );
return i_ret;
}
/* Run libvlc, in non-blocking mode */
i_ret = VLC_Play( 0 );
/* Add a blocking interface and keep the return value */
i_ret = VLC_AddIntf( 0, NULL, VLC_TRUE );
/* Finish the threads */
VLC_Stop( 0 );
/* Destroy the libvlc structure */
VLC_Destroy( 0 );
return i_ret;
}
#ifndef WIN32
/*****************************************************************************
* SigHandler: system signal handler
*****************************************************************************
* This function is called when a fatal signal is received by the program.
* It tries to end the program in a clean way.
*****************************************************************************/
static void SigHandler( int i_signal )
{
static time_t abort_time = 0;
static volatile vlc_bool_t b_die = VLC_FALSE;
/* Once a signal has been trapped, the termination sequence will be
* armed and subsequent signals will be ignored to avoid sending signals
* to a libvlc structure having been destroyed */
if( !b_die )
{
b_die = VLC_TRUE;
abort_time = time( NULL );
fprintf( stderr, "signal %d received, terminating vlc - do it "
"again in case it gets stuck\n", i_signal );
/* Acknowledge the signal received */
VLC_Die( 0 );
}
else if( time( NULL ) > abort_time + 2 )
{
/* If user asks again 1 or 2 seconds later, die badly */
signal( SIGINT, SIG_DFL );
signal( SIGHUP, SIG_DFL );
signal( SIGQUIT, SIG_DFL );
signal( SIGALRM, SIG_DFL );
signal( SIGPIPE, SIG_DFL );
fprintf( stderr, "user insisted too much, dying badly\n" );
abort();
}
}
#endif
> Sooyoung Sung wrote:
>> I tried calling fork() inside main() in vlc.c, but the compiler keeps
>> complaining "undefined reference to '_fork'.
>>
>
> Please send the code which you are trying (only vlc.c) then someone
> could probably figure out what you are doing wrong.
>
>> I included <unistd.h> and <sys/types.h>.
>> Call to 'execvp()' works fine, which puzzles me more. Any idea?
>
>
> --
> Kind greetings,
>
> Jean-Paul Saman
>
>
>
> --
> This is the vlc-devel mailing-list, see http://www.videolan.org/vlc/
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>
>
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