| 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) %G%"; |
| 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 |
| 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 | } |