daemon program sample

sample_daemon.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

int main(void)
{
	/* exit session leader */
	switch (fork()) {
		case -1:
			perror("fork() failed.");
			_exit(1);
		case 0:
			break;	
		default:
			/* exit parent process */
			_exit(0);
	}

	/* daemonize */
	int nochdir = 1;
	int noclose = 1;
	if (daemon(!nochdir, !noclose)) {
		perror("daemon() failed.");
		_exit(1);
	}

	/* close std{in,out,err} */
	fclose(stdin);
	fclose(stdout);
	fclose(stderr);

	/* exec command */
	if (system("/bin/sleep 100 < /dev/null")) {
		perror("system() failed.");
		_exit(1);
	}

	return 0;
}