From 3605e6ed71680cea447769db8b4be9160675265e Mon Sep 17 00:00:00 2001
From: Nick Peng <pymumu@gmail.com>
Date: Fri, 5 Aug 2022 22:13:26 +0800
Subject: [PATCH] smartdns: support no create pid file.

---
 src/smartdns.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/smartdns.c b/src/smartdns.c
index cd61858..025f42c 100644
--- a/src/smartdns.c
+++ b/src/smartdns.c
@@ -132,7 +132,7 @@ static void _help(void)
 		"Start smartdns server.\n"
 		"  -f            run forground.\n"
 		"  -c [conf]     config file.\n"
-		"  -p [pid]      pid file path\n"
+		"  -p [pid]      pid file path, '-' means don't create pid file.\n"
 		"  -S            ignore segment fault signal.\n"
 		"  -x            verbose screen.\n"
 		"  -v            dispaly version.\n"
@@ -571,7 +571,7 @@ int main(int argc, char *argv[])
 		_reg_signal();
 	}
 
-	if (create_pid_file(pid_file) != 0) {
+	if (strncmp(pid_file, "-", 2) != 0 && create_pid_file(pid_file) != 0) {
 		goto errout;
 	}