From 4bf1b65f3ca244e47e9a7d6f0c475f402aea0d44 Mon Sep 17 00:00:00 2001
From: Brent Cook <busterb@gmail.com>
Date: Wed, 31 Dec 2014 08:26:41 -0600
Subject: [PATCH 16/16] add -p option to create a pid file

This is used in both the Gentoo and Debian ports.

Origin: https://bugs.gentoo.org/show_bug.cgi?id=493082
---
 src/usr.sbin/ntpd/ntpd.8 |  4 ++++
 src/usr.sbin/ntpd/ntpd.c | 33 ++++++++++++++++++++++++++++-----
 src/usr.sbin/ntpd/ntpd.h |  1 +
 3 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/src/usr.sbin/ntpd/ntpd.8 b/src/usr.sbin/ntpd/ntpd.8
index 18b12e8..9eb1fee 100644
--- a/src/usr.sbin/ntpd/ntpd.8
+++ b/src/usr.sbin/ntpd/ntpd.8
@@ -25,6 +25,7 @@
 .Bk -words
 .Op Fl dnSsv
 .Op Fl f Ar file
+.Op Fl p Ar file
 .Ek
 .Sh DESCRIPTION
 The
@@ -56,6 +57,9 @@ instead of the default
 .It Fl n
 Configtest mode.
 Only check the configuration file for validity.
+.It Fl p Ar file
+Write pid to
+.Ar file
 .It Fl S
 Do not set the time immediately at startup.
 This is the default.
diff --git a/src/usr.sbin/ntpd/ntpd.c b/src/usr.sbin/ntpd/ntpd.c
index 3622a13..b6b3663 100644
--- a/src/usr.sbin/ntpd/ntpd.c
+++ b/src/usr.sbin/ntpd/ntpd.c
@@ -84,6 +84,18 @@ sighdlr(int sig)
 	}
 }
 
+void
+writepid(struct ntpd_conf *lconf)
+{
+	if (lconf->pid_file != NULL) {
+		FILE *f = fopen(lconf->pid_file, "w");
+		if (f == NULL)
+			fatal("couldn't open pid file");
+		fprintf(f, "%ld\n", (long) getpid());
+		fclose(f);
+	}
+}
+
 __dead void
 usage(void)
 {
@@ -92,7 +104,7 @@ usage(void)
 	if (strcmp(__progname, "ntpctl") == 0)
 		fprintf(stderr, "usage: ntpctl [-s all | peers | Sensors | status]\n");
 	else
-		fprintf(stderr, "usage: %s [-dnSsv] [-f file]\n",
+		fprintf(stderr, "usage: %s [-dnSsv] [-f file] [-p file]\n",
 		    __progname);
 	exit(1);
 }
@@ -124,7 +136,7 @@ main(int argc, char *argv[])
 
 	log_init(1);		/* log to stderr until daemonized */
 
-	while ((ch = getopt(argc, argv, "df:nsSv")) != -1) {
+	while ((ch = getopt(argc, argv, "df:np:sSv")) != -1) {
 		switch (ch) {
 		case 'd':
 			lconf.debug = 1;
@@ -135,6 +147,9 @@ main(int argc, char *argv[])
 		case 'n':
 			lconf.noaction = 1;
 			break;
+		case 'p':
+			lconf.pid_file = optarg;
+			break;
 		case 's':
 			lconf.settime = 1;
 			break;
@@ -175,9 +190,11 @@ main(int argc, char *argv[])
 	reset_adjtime();
 	if (!lconf.settime) {
 		log_init(lconf.debug);
-		if (!lconf.debug)
+		if (!lconf.debug) {
 			if (daemon(1, 0))
 				fatal("daemon");
+			writepid(&lconf);
+		}
 	} else
 		timeout = SETTIME_TIMEOUT * 1000;
 
@@ -227,9 +244,11 @@ main(int argc, char *argv[])
 			log_init(lconf.debug);
 			log_debug("no reply received in time, skipping initial "
 			    "time setting");
-			if (!lconf.debug)
+			if (!lconf.debug) {
 				if (daemon(1, 0))
 					fatal("daemon");
+				writepid(&lconf);
+			}
 		}
 
 		if (nfds > 0 && (pfd[PFD_PIPE].revents & POLLOUT))
@@ -268,6 +287,8 @@ main(int argc, char *argv[])
 	msgbuf_clear(&ibuf->w);
 	free(ibuf);
 	log_info("Terminating");
+	if (lconf.pid_file != NULL)
+		unlink(lconf.pid_file);
 	return (0);
 }
 
@@ -343,9 +364,11 @@ dispatch_imsg(struct ntpd_conf *lconf)
 			memcpy(&d, imsg.data, sizeof(d));
 			ntpd_settime(d);
 			/* daemonize now */
-			if (!lconf->debug)
+			if (!lconf->debug) {
 				if (daemon(1, 0))
 					fatal("daemon");
+				writepid(lconf);
+			}
 			lconf->settime = 0;
 			timeout = INFTIM;
 			break;
diff --git a/src/usr.sbin/ntpd/ntpd.h b/src/usr.sbin/ntpd/ntpd.h
index efb0c61..136bdd2 100644
--- a/src/usr.sbin/ntpd/ntpd.h
+++ b/src/usr.sbin/ntpd/ntpd.h
@@ -201,6 +201,7 @@ struct ntpd_conf {
 	u_int8_t					debug;
 	u_int8_t					noaction;
 	u_int8_t					filters;
+	char						*pid_file;
 };
 
 struct ctl_show_status {
-- 
1.9.1