突然想到這個老掉牙的笑話

sid = setsid();
printf("Starting daemon, sid = %dn", sid);
printf("Disabling each standard file pipes... n");
int FilePipe[3] = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
for(int i = 0; i < sizeof(FilePipe)/sizeof(int); ++i)
	close(FilePipe[i]);
printf("Donen");