1 /*-
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 04/02/94";
10 #endif /* not lint */
11
12 #include <sys/types.h>
13 #include <sys/stat.h>
14
15 #include <err.h>
16 #include <stdio.h>
17 #include <stdlib.h>
18 #include <unistd.h>
19
20 #include "stty.h"
21 #include "extern.h"
22
23 /*
24 * Gross, but since we're changing the control descriptor from 1 to 0, most
25 * users will be probably be doing "stty > /dev/sometty" by accident. If 1
26 * and 2 are both ttys, but not the same, assume that 1 was incorrectly
27 * redirected.
28 */
29 void
checkredirect()30 checkredirect()
31 {
32 struct stat sb1, sb2;
33
34 if (isatty(STDOUT_FILENO) && isatty(STDERR_FILENO) &&
35 !fstat(STDOUT_FILENO, &sb1) && !fstat(STDERR_FILENO, &sb2) &&
36 (sb1.st_rdev != sb2.st_rdev))
37 warn("stdout appears redirected, but stdin is the control descriptor");
38 }
39