upstream commit

Unlink PidFile on SIGHUP and always recreate it when the
new sshd starts. Regression tests (and possibly other things) depend on the
pidfile being recreated after SIGHUP, and unlinking it means it won't contain
a stale pid if sshd fails to restart.  ok djm@ markus@

Upstream-ID: 132dd6dda0c77dd49d2f15b2573b5794f6160870
diff --git a/sshd.c b/sshd.c
index fafcd34..53107ca 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sshd.c,v 1.478 2016/11/30 00:28:31 dtucker Exp $ */
+/* $OpenBSD: sshd.c,v 1.479 2016/12/04 22:27:25 dtucker Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -290,6 +290,8 @@
 sighup_restart(void)
 {
 	logit("Received SIGHUP; restarting.");
+	if (options.pid_file != NULL)
+		unlink(options.pid_file);
 	platform_pre_restart();
 	close_listen_socks();
 	close_startup_pipes();
@@ -1841,7 +1843,7 @@
 		 * Write out the pid file after the sigterm handler
 		 * is setup and the listen sockets are bound
 		 */
-		if (options.pid_file != NULL && !debug_flag && !already_daemon) {
+		if (options.pid_file != NULL && !debug_flag) {
 			FILE *f = fopen(options.pid_file, "w");
 
 			if (f == NULL) {