From 37712f2a7bde02580b9dd2ab99ef99029ce8e987 Mon Sep 17 00:00:00 2001
From: Joerg Wunsch <joerg@FreeBSD.org>
Date: Sun, 2 Jul 1995 08:54:27 +0000
Subject: [PATCH] stty fails with a non-obvious error message if it's run on a
 non-tty stream, such as a rsh or vi pipeline.

The error message is:
stty: TIOCGETD: Operation not supported

It's immediately obvious to the knowledgable hacker type, but not
exactly comforting to the user who's not native to unix.  It's
especially confusing if there's a stty command in their .cshrc and
it's showing up on rsh output.

(Fixes PR #bin/573)

Submitted by:	peter@haywire.dialix.com (Peter Wemm)
---
 bin/stty/stty.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/bin/stty/stty.c b/bin/stty/stty.c
index d8ce2ffb76d..9d9f67970b0 100644
--- a/bin/stty/stty.c
+++ b/bin/stty/stty.c
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: stty.c,v 1.3 1995/04/29 15:00:34 bde Exp $
+ *	$Id: stty.c,v 1.4 1995/05/30 00:07:28 rgrimes Exp $
  */
 
 #ifndef lint
@@ -95,10 +95,12 @@ main(argc, argv)
 args:	argc -= optind;
 	argv += optind;
 
+	if (tcgetattr(i.fd, &i.t) < 0) {
+		warn("tcgetattr: not running on a terminal");
+		exit(1);
+	}
 	if (ioctl(i.fd, TIOCGETD, &i.ldisc) < 0)
 		err(1, "TIOCGETD");
-	if (tcgetattr(i.fd, &i.t) < 0)
-		err(1, "tcgetattr");
 	if (ioctl(i.fd, TIOCGWINSZ, &i.win) < 0)
 		warn("TIOCGWINSZ: %s\n", strerror(errno));