Check if 0, 1, 2 are valid tty file descriptors

2014-11-30 13:04:47 +00:00 · 2014-11-30 13:04:47 +00:00 · 2d45a04b92
commit 2d45a04b92
parent 6da76775cb
1 changed files with 2 additions and 2 deletions
--- 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;