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Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 66 |
1 files changed, 66 insertions, 0 deletions
@@ -0,0 +1,66 @@ +/*- + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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/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"); +} |