Add the ability to specify alternate PID file for syslogd.

PR:		25784
Submitted by:	Jon Villarreal <jonv@ivmg.net>
Reviewed by:	iedowse

usr.sbin/syslogd/syslogd.8

@@ -45,6 +45,7 @@
 .Op Fl f Ar config_file
 .Op Fl m Ar mark_interval
 .Op Fl p Ar log_socket
+.Op Fl P Ar pid_file
 .Op Fl l Ar path
 .Sh DESCRIPTION
 The
@@ -172,6 +173,10 @@ Disable dns query for every request.
 Specify the pathname of an alternate log socket to be used instead;
 the default is
 .Pa /var/run/log .
+.It Fl P
+Specify an alternative file in which to store the process id.
+The default is
+.Pa /var/run/syslog.pid .
 .It Fl l
 Specify a location where
 .Nm
@@ -220,7 +225,8 @@ and from the special device
 .Pp
 The
 .Nm
-daemon creates the file
+daemon creates its process id file,
+by default
 .Pa /var/run/syslog.pid ,
 and stores its process
 id there.
@@ -241,8 +247,7 @@ include file
 .It Pa /etc/syslog.conf
 configuration file
 .It Pa /var/run/syslog.pid
-process id of current
-.Nm
+default process id file
 .It Pa /var/run/log
 name of the
 .Tn UNIX

usr.sbin/syslogd/syslogd.c

@@ -325,7 +325,7 @@ main(argc, argv)
 	pid_t ppid = 1;
 	socklen_t len;
 
-	while ((ch = getopt(argc, argv, "46Aa:df:kl:m:np:suv")) != -1)
+	while ((ch = getopt(argc, argv, "46Aa:df:kl:m:np:P:suv")) != -1)
 		switch (ch) {
 		case '4':
 			family = PF_INET;
@@ -367,6 +367,9 @@ main(argc, argv)
 		case 'p':		/* path */
 			funixn[0] = optarg;
 			break;
+		case 'P':		/* path for alt. PID */
+			PidFile = optarg;
+			break;
 		case 's':		/* no network mode */
 			SecureMode++;
 			break;
@@ -596,8 +599,8 @@ usage()
 
 	fprintf(stderr, "%s\n%s\n%s\n",
 		"usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]",
-		"               [-m mark_interval] [-p log_socket]",
-		"               [-l log_socket]");
+		"               [-m mark_interval] [-l log_socket]",
+		"               [-p log_socket] [-P pid_file]");
 	exit(1);
 }