lpd: Add -F flag to prevent daemonizing

This is necessary for use with supervision, e.g. runit.

I chose -F simply because that is what the folks at LPRng use.

Approved by:		pfg, gad, ngie
Differential Revision:	https://reviews.freebsd.org/D29566

2 files changed, 26 insertions, 7 deletions

diff --git a/usr.sbin/lpr/lpd/lpd.8 b/usr.sbin/lpr/lpd/lpd.8
index 2554aba2f834..c9607265ee6f 100644
--- a/usr.sbin/lpr/lpd/lpd.8
+++ b/usr.sbin/lpr/lpd/lpd.8
@@ -108,6 +108,17 @@ This means that
 will not accept any connections from any remote
 hosts, although it will still accept print requests
 from all local users.
+.It Fl F
+By default,
+.Nm
+will daemonize into the background.
+The
+.Fl F
+flag causes
+.Nm
+to remain in the foreground.
+Logging is still performed with
+.Xr syslog 3 .
 .It Fl W
 By default, the
 .Nm
diff --git a/usr.sbin/lpr/lpd/lpd.c b/usr.sbin/lpr/lpd/lpd.c
index f2f8994d1fee..56821d114268 100644
--- a/usr.sbin/lpr/lpd/lpd.c
+++ b/usr.sbin/lpr/lpd/lpd.c
@@ -104,6 +104,7 @@ __FBSDID("$FreeBSD$");
 
 int	lflag;				/* log requests flag */
 int	sflag;				/* no incoming port flag */
+int	Fflag;				/* run in foreground flag */
 int	from_remote;			/* from remote socket */
 
 int		 main(int argc, char **_argv);
@@ -152,7 +153,7 @@ main(int argc, char **argv)
 		errx(EX_NOPERM,"must run as root");
 
 	errs = 0;
-	while ((i = getopt(argc, argv, "cdlpswW46")) != -1)
+	while ((i = getopt(argc, argv, "cdlpswFW46")) != -1)
 		switch (i) {
 		case 'c':
 			/* log all kinds of connection-errors to syslog */
@@ -184,6 +185,9 @@ main(int argc, char **argv)
 			syslog(LOG_WARNING,
 			    "NOTE: please change your lpd config to use -W");
 			/* FALLTHROUGH */
+		case 'F':
+			Fflag++;
+			break;
 		case 'W':
 			/* allow connections coming from a non-reserved port */
 			/* (done by some lpr-implementations for MS-Windows) */ 
@@ -264,12 +268,16 @@ main(int argc, char **argv)
 			     WEXITSTATUS(status));
 	}
 
-#ifndef DEBUG
+#ifdef DEBUG
+	Fflag++;
+#endif
 	/*
-	 * Set up standard environment by detaching from the parent.
+	 * Set up standard environment by detaching from the parent
+	 * if -F not specified
 	 */
-	daemon(0, 0);
-#endif
+	if (Fflag == 0) {
+		daemon(0, 0);
+	}
 
 	openlog("lpd", LOG_PID, LOG_LPR);
 	syslog(LOG_INFO, "lpd startup: logging=%d%s%s", lflag,
@@ -932,9 +940,9 @@ static void
 usage(void)
 {
 #ifdef INET6
-	fprintf(stderr, "usage: lpd [-cdlsW46] [port#]\n");
+	fprintf(stderr, "usage: lpd [-cdlsFW46] [port#]\n");
 #else
-	fprintf(stderr, "usage: lpd [-cdlsW] [port#]\n");
+	fprintf(stderr, "usage: lpd [-cdlsFW] [port#]\n");
 #endif
 	exit(EX_USAGE);
 }