Add and document an option to cause syslogd to run in the

foreground.

This allows a separate process to monitor when and how
syslogd exits. That process can then restart syslogd if needed.

Differential Revision:	https://reviews.freebsd.org/D1985
Submitted by:	Ravi Pokala
Reviewed by:	allanjude (man page)

2 files changed, 19 insertions, 4 deletions

diff --git a/usr.sbin/syslogd/syslogd.8 b/usr.sbin/syslogd/syslogd.8
index 5b175a6..063c83b 100644
--- a/usr.sbin/syslogd/syslogd.8
+++ b/usr.sbin/syslogd/syslogd.8
@@ -36,7 +36,7 @@
 .Nd log systems messages
 .Sh SYNOPSIS
 .Nm
-.Op Fl 468ACcdkNnosTuv
+.Op Fl 468ACcdFkNnosTuv
 .Op Fl a Ar allowed_peer
 .Op Fl b Ar bind_address
 .Op Fl f Ar config_file
@@ -213,6 +213,17 @@ This is probably only of use to developers working on
 Specify the pathname of an alternate configuration file;
 the default is
 .Pa /etc/syslog.conf .
+.It Fl F
+Run
+.Nm
+in the foreground, rather than going into daemon mode. This is useful if
+some other process uses
+.Xr fork 2
+and
+.Xr exec 3
+to run
+.Nm ,
+and wants to monitor when and how it exits.
 .It Fl k
 Disable the translation of
 messages received with facility
diff --git a/usr.sbin/syslogd/syslogd.c b/usr.sbin/syslogd/syslogd.c
index bc054b8..a79086e 100644
--- a/usr.sbin/syslogd/syslogd.c
+++ b/usr.sbin/syslogd/syslogd.c
@@ -271,6 +271,7 @@ static struct filed *Files;	/* Log files that we write to */
 static struct filed consfile;	/* Console */
 
 static int	Debug;		/* debug flag */
+static int	Foreground = 0;	/* Run in foreground, instead of daemonizing */
 static int	resolve = 1;	/* resolve hostname */
 static char	LocalHostName[MAXHOSTNAMELEN];	/* our hostname */
 static const char *LocalDomain;	/* our local domain name */
@@ -360,7 +361,7 @@ main(int argc, char *argv[])
 		dprintf("madvise() failed: %s\n", strerror(errno));
 
 	bindhostname = NULL;
-	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv"))
+	while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv"))
 	    != -1)
 		switch (ch) {
 		case '4':
@@ -396,6 +397,9 @@ main(int argc, char *argv[])
 		case 'f':		/* configuration file */
 			ConfFile = optarg;
 			break;
+		case 'F':		/* run in foreground instead of daemon */
+			Foreground++;
+			break;
 		case 'k':		/* keep remote kern fac */
 			KeepKernFac = 1;
 			break;
@@ -487,14 +491,14 @@ main(int argc, char *argv[])
 		warn("cannot open pid file");
 	}
 
-	if (!Debug) {
+	if ((!Foreground) && (!Debug)) {
 		ppid = waitdaemon(0, 0, 30);
 		if (ppid < 0) {
 			warn("could not become daemon");
 			pidfile_remove(pfh);
 			exit(1);
 		}
-	} else {
+	} else if (Debug) {
 		setlinebuf(stdout);
 	}