Created
September 30, 2014 19:56
-
-
Save bfolkens/6118e2af21fddfdaf498 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
* daemonize.c | |
* This example daemonizes a process, writes a few log messages, | |
* sleeps 20 seconds and terminates afterwards. | |
*/ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <signal.h> | |
#include <sys/types.h> | |
#include <sys/stat.h> | |
#include <syslog.h> | |
static void skeleton_daemon() | |
{ | |
pid_t pid; | |
/* Fork off the parent process */ | |
pid = fork(); | |
/* An error occurred */ | |
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(); | |
/* An error occurred */ | |
if (pid < 0) | |
exit(EXIT_FAILURE); | |
/* Success: Let the parent terminate */ | |
if (pid > 0) | |
exit(EXIT_SUCCESS); | |
/* Set new file permissions */ | |
umask(0); | |
/* Change the working directory to the root directory */ | |
/* or another appropriated directory */ | |
chdir("/"); | |
/* Close all open file descriptors */ | |
int x; | |
for (x = sysconf(_SC_OPEN_MAX); x>0; x--) | |
{ | |
close (x); | |
} | |
/* Open the log file */ | |
openlog ("firstdaemon", LOG_PID, LOG_DAEMON); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment