From 80a29058832fc0077e285b748cf89c7a186bd8e1 Mon Sep 17 00:00:00 2001
From: Sofian Brabez <sbz@FreeBSD.org>
Date: Tue, 16 Aug 2016 14:15:09 +0000
Subject: [PATCH] tty: Use proper definition of exit status code and stdin
 macro

Reviewed by:	bapt, bdrewery
Differential Revision:	https://reviews.freebsd.org/D6828
---
 usr.bin/tty/tty.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/usr.bin/tty/tty.c b/usr.bin/tty/tty.c
index 450722a6698..fac74d034b5 100644
--- a/usr.bin/tty/tty.c
+++ b/usr.bin/tty/tty.c
@@ -63,17 +63,18 @@ main(int argc, char *argv[])
 		case '?':
 		default:
 			usage();
+			/* NOTREACHED */
 		}
 
-	t = ttyname(0);
+	t = ttyname(STDIN_FILENO);
 	if (!sflag)
 		puts(t ? t : "not a tty");
-	exit(t ? 0 : 1);
+	exit(t ? EXIT_SUCCESS : EXIT_FAILURE);
 }
 
 static void
 usage(void)
 {
-	fprintf(stderr, "usage: tty [-s]\n");
+	fprintf(stderr, "usage: %s [-s]\n", getprogname());
 	exit(2);
 }