From 0d3e72861810e434c4f79b7a74e5268eac06b3fe Mon Sep 17 00:00:00 2001
From: Archie Cobbs <archie@FreeBSD.org>
Date: Thu, 27 Jul 2000 21:55:48 +0000
Subject: [PATCH] Add '-n' flag: don't attempt to read any data from standard
 input.

---
 usr.sbin/nghook/main.c   | 15 ++++++++++++---
 usr.sbin/nghook/nghook.8 | 18 ++++++++++++++----
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/usr.sbin/nghook/main.c b/usr.sbin/nghook/main.c
index 93ba6cd5cccf..c0ef43d572b6 100644
--- a/usr.sbin/nghook/main.c
+++ b/usr.sbin/nghook/main.c
@@ -72,10 +72,11 @@ main(int ac, char *av[])
 	int     csock, dsock;
 	int     asciiFlag = 0;
 	int     loopFlag = 0;
+	int	noInput = 0;
 	int	ch;
 
 	/* Parse flags */
-	while ((ch = getopt(ac, av, "adl")) != EOF) {
+	while ((ch = getopt(ac, av, "adln")) != EOF) {
 		switch (ch) {
 		case 'a':
 			asciiFlag = 1;
@@ -86,6 +87,9 @@ main(int ac, char *av[])
 		case 'l':
 			loopFlag = 1;
 			break;
+		case 'n':
+			noInput = 1;
+			break;
 		case '?':
 		default:
 			Usage();
@@ -119,13 +123,18 @@ main(int ac, char *av[])
 	    NGM_GENERIC_COOKIE, NGM_CONNECT, &ngc, sizeof(ngc)) < 0)
 		errx(EX_OSERR, "can't connect to node");
 
+	/* Close standard input if not reading from it */
+	if (noInput)
+		fclose(stdin);
+
 	/* Relay data */
 	while (1) {
 		fd_set  rfds;
 
 		/* Setup bits */
 		FD_ZERO(&rfds);
-		FD_SET(0, &rfds);
+		if (!noInput)
+			FD_SET(0, &rfds);
 		FD_SET(dsock, &rfds);
 
 		/* Wait for something to happen */
@@ -224,6 +233,6 @@ WriteAscii(u_char *buf, int len)
 static void
 Usage(void)
 {
-	errx(EX_USAGE, "usage: nghook [-da] path [hookname]");
+	errx(EX_USAGE, "usage: nghook [-adln] path [hookname]");
 }
 
diff --git a/usr.sbin/nghook/nghook.8 b/usr.sbin/nghook/nghook.8
index 746095169778..abab2c2f5a5a 100644
--- a/usr.sbin/nghook/nghook.8
+++ b/usr.sbin/nghook/nghook.8
@@ -46,6 +46,7 @@ node
 .Op Fl a
 .Op Fl d
 .Op Fl l
+.Op Fl n
 .Ar path
 .Op Ar hookname
 .Sh DESCRIPTION
@@ -65,18 +66,27 @@ is assumed.
 At this point all data written to standard input is sent
 to the node and all data received from the node is relayed
 to standard output.
+.Nm
+exits when
+.Dv EOF
+is detected on standard input.
 .Pp
 The options are as follows:
 .Pp
 .Bl -tag -width indent
 .It Fl a
-Output each read packet in
-.Tn ASCII .
+Output each packet read in human-readable decoded
+.Tn ASCII
+form instead of raw binary.
 .It Fl d
 Increase the debugging verbosity level.
 .It Fl l
 Loops all received data back to the hook in addition to writing it
 to standard output.
+.It Fl n
+Don't attempt to read any data from standard input.
+.Nm
+will continue reading from the node until stopped by a signal.
 .El
 .Sh BUGS
 Although all input is read in unbuffered mode, 
@@ -84,7 +94,7 @@ there's no way to control the packetization of the input.
 .Sh SEE ALSO
 .Xr netgraph 4 ,
 .Xr netgraph 3 ,
-.Xr ngctl 8 .
+.Xr ngctl 8
 .Sh HISTORY
 The
 .Em netgraph
@@ -92,5 +102,5 @@ system was designed and first implemented at Whistle Communications, Inc.
 in a version of
 .Fx 2.2
 customized for the Whistle InterJet.
-.Sh AUTHOR
+.Sh AUTHORS
 .An Archie Cobbs Aq archie@whistle.com