utils.c

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/*******************************************************************************
#                                                                              #
#      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 <linux/stat.h>
#include <sys/stat.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);

    fr = chdir("/");
    if(fr != 0) {
        fprintf(stderr, "chdir(/) failed\n");
        exit(0);
    }

    close(0);
    close(1);
    close(2);

    open("/dev/null", O_RDWR);

    fr = dup(0);
    fr = dup(0);
}