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daemon.h
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/*
grive-daemon syncs your ~/Google Drive folder by calling grive.
Copyright (C) 2014 Christopher Kyle Horton
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.
*/
#ifndef DAEMON_H
#define DAEMON_H
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <syslog.h>
#include <pwd.h>
#include <fcntl.h>
#include <errno.h>
static void daemonize()
{
pid_t pid;
/* Fork off the parent process */
pid = fork();
if (pid < 0)
exit(EXIT_FAILURE);
/* Success: Let the parent terminate */
if (pid > 0)
exit(EXIT_SUCCESS);
/* On success: The child process becomes session leader */
if (setsid() < 0)
exit(EXIT_FAILURE);
/* Catch, ignore and handle signals */
//TODO: Implement a working signal handler */
signal(SIGCHLD, SIG_IGN);
signal(SIGHUP, SIG_IGN);
/* Fork off for the second time*/
pid = fork();
if (pid < 0)
exit(EXIT_FAILURE);
/* Success: Let the parent terminate */
if (pid > 0)
exit(EXIT_SUCCESS);
umask(0);
openlog ("grive-daemon", LOG_PID, LOG_DAEMON);
/* Close all open file descriptors */
int x;
for (x = sysconf(_SC_OPEN_MAX); x>0; x--)
{
close (x);
}
}
#endif