[PATCH 5/5] daemon: new option --detach to run git-daemon in background

@@ -662,6 +662,27 @@ static int service_loop(int socknum, int
 	}
 }
 
+static void daemonize(void)
+{
+	int devnull = -1;
+	switch (fork()) {
+		case 0:
+			break;
+		case -1:
+			die("fork failed: %s", strerror(errno));
+		default:
+			exit(0);
+	}
+	if (setsid() == -1)
+		die("setsid failed: %s", strerror(errno));
+	if ((devnull = open("/dev/null", O_RDWR, 0)) == -1)
+		die("open /dev/null failed: %s", strerror(errno));
+	if (dup2(devnull, 0) != 0 ||
+		dup2(devnull, 1) != 1 ||
+		dup2(devnull, 2) != 2)
+		die("dup2 failed: %s", strerror(errno));
+}
+
 /* if any standard file descriptor is missing open it to /dev/null */
 static void sanitize_stdfds(void)
 {

@@ -705,6 +726,7 @@ int main(int argc, char **argv)
 	int port = DEFAULT_GIT_PORT;
 	int inetd_mode = 0;
 	const char *pid_file = NULL;
+	int detach = 0;
 	int i;
 
 	/* Without this we cannot rely on waitpid() to tell

@@ -773,6 +795,11 @@ int main(int argc, char **argv)
 			pid_file = arg + 11;
 			continue;
 		}
+		if (!strcmp(arg, "--detach")) {
+			detach = 1;
+			log_syslog = 1;
+			continue;
+		}
 		if (!strcmp(arg, "--")) {
 			ok_paths = &argv[i+1];
 			break;

@@ -805,7 +832,10 @@ int main(int argc, char **argv)
 		return execute(peer);
 	}
 
-	sanitize_stdfds();
+	if (detach)
+		daemonize();
+	else
+		sanitize_stdfds();
 
 	if (pid_file)
 		store_pid(pid_file);