utils.c

/*******************************************************************************
#                                                                              #
#      MJPG-streamer allows to stream JPG frames from an input-plugin          #
#      to several output plugins                                               #
#                                                                              #
#      Copyright (C) 2007 Tom Stöveken                                         #
#                                                                              #
# 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; version 2 of the License.                      #
#                                                                              #
# 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  02111-1307  USA    #
#                                                                              #
*******************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/types.h>
#include <string.h>
#include <fcntl.h>
#include <wait.h>
#include <time.h>
#include <limits.h>

#include "utils.h"

/******************************************************************************
Description.: 
Input Value.: 
Return Value: 
******************************************************************************/
void daemon_mode(void) {
  int fr=0;

  fr = fork();
  if( fr < 0 ) {
    fprintf(stderr, "fork() failed\n");
    exit(1);
  }
  if ( fr > 0 ) {
    exit(0);
  }

  if( setsid() < 0 ) {
    fprintf(stderr, "setsid() failed\n");
    exit(1);
  }

  fr = fork();
  if( fr < 0 ) {
    fprintf(stderr, "fork() failed\n");
    exit(1);
  }
  if ( fr > 0 ) {
    fprintf(stderr, "forked to background (%d)\n", fr);
    exit(0);
  }

  umask(0);

  chdir("/");
  close(0);
  close(1);
  close(2);

  open("/dev/null", O_RDWR);
  dup(0);
  dup(0);
}