From 2d45a04b92df641158ca400873a522fede1d9a01 Mon Sep 17 00:00:00 2001
From: sin <sin@2f30.org>
Date: Sun, 30 Nov 2014 13:04:47 +0000
Subject: [PATCH] Check if 0, 1, 2 are valid tty file descriptors

---
 login.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/login.c b/login.c
index e0930c5..45b69ea 100644
--- a/login.c
+++ b/login.c
@@ -71,8 +71,8 @@ main(int argc, char *argv[])
 	if (argc < 1)
 		usage();
 
-	if (isatty(STDIN_FILENO) == 0)
-		eprintf("stdin is not a tty\n");
+	if (isatty(0) == 0 || isatty(1) == 0 || isatty(2) == 0)
+		eprintf("no tty");
 
 	user = argv[0];
 	errno = 0;