/bin/stty/util.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 64 lines · 24 code · 6 blank · 34 comment · 4 complexity · 9a177efd399a9ecaf2ca9b02706fe8b9 MD5 · raw file
- /*-
- * Copyright (c) 1991, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 4/2/94";
- #endif
- #endif /* not lint */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <err.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include "stty.h"
- #include "extern.h"
- /*
- * Gross, but since we're changing the control descriptor from 1 to 0, most
- * users will be probably be doing "stty > /dev/sometty" by accident. If 1
- * and 2 are both ttys, but not the same, assume that 1 was incorrectly
- * redirected.
- */
- void
- checkredirect(void)
- {
- struct stat sb1, sb2;
- if (isatty(STDOUT_FILENO) && isatty(STDERR_FILENO) &&
- !fstat(STDOUT_FILENO, &sb1) && !fstat(STDERR_FILENO, &sb2) &&
- (sb1.st_rdev != sb2.st_rdev))
- warnx("stdout appears redirected, but stdin is the control descriptor");
- }