Daemonise.c

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// [[[[http://www.organicdesign.co.nz/peerd|peerd]]]] - nodal p2p wiki daemon
// This article and all its includes are licenced under LGPL
// GPL: [[[[http://www.gnu.org/copyleft/lesser.html]]]]
// SRC: [[[[http://www.organicdesign.co.nz/daemonise.c]]]]
// included in [[[[http://www.organicdesign.co.nz/category:peerd/files/C|peerd]]]][[[[http://www.organicdesign.co.nz/peerd.c|/peerd.c]]]]

int peerdInit();


// ----------------------------------------------------------------------------------------- //
// daemonise.c

int peerdInit() {

	// Fork so parent can exit and return control to what invoked it
	pid_t pid = fork();
	if (pid > 0) exit(EXIT_SUCCESS);
	if (pid < 0) {
		logAdd("daemonise: First fork() failed!");
		exit(EXIT_FAILURE);
		}

	// Become a new session leader with no controlling term
	if (setsid() < 0) {
		logAdd("daemonise: setsid() failed!");
		exit(EXIT_FAILURE);
		}

	// Fork again to be a non-session-leader which can't gain a controlling term
	pid = fork();
	if (pid > 0) exit(EXIT_SUCCESS);
	if (pid < 0) {
		logAdd("daemonise: second fork() failed!");
		exit(EXIT_FAILURE);
		}

	errno = 0;
	// Should be /home/lc(peer)
	chdir("/home/peerd");

	// Don't inherit any file perms mask
	umask(0);

	//close(STDIN_FILENO);
	//close(STDOUT_FILENO);
	//close(STDERR_FILENO);

	return errno;
	}