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/* $OpenBSD: mesg.c,v 1.12 2016/07/07 09:26:26 semarie Exp $ */ |
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/* $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $ */ |
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/* |
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* Copyright (c) 1987, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* (c) UNIX System Laboratories, Inc. |
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* All or some portions of this file are derived from material licensed |
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* to the University of California by American Telephone and Telegraph |
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with |
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* the permission of UNIX System Laboratories, Inc. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <err.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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int |
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main(int argc, char *argv[]) |
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{ |
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struct stat sb; |
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char *tty; |
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int ch; |
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if (pledge("stdio rpath fattr wpath cpath", NULL) == -1) |
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err(2, "pledge"); |
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while ((ch = getopt(argc, argv, "")) != -1) |
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switch (ch) { |
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case '?': |
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default: |
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goto usage; |
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} |
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argc -= optind; |
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argv += optind; |
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if ((tty = ttyname(STDERR_FILENO)) == NULL) |
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err(2, "ttyname"); |
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if (stat(tty, &sb) < 0) |
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err(2, "%s", tty); |
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sb.st_mode &= ACCESSPERMS; |
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if (*argv == NULL) { |
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if (sb.st_mode & S_IWGRP) { |
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(void)fprintf(stderr, "is y\n"); |
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exit(0); |
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} |
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(void)fprintf(stderr, "is n\n"); |
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exit(1); |
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} |
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switch (*argv[0]) { |
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case 'y': |
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if (chmod(tty, sb.st_mode | S_IWGRP) < 0) |
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err(2, "%s", tty); |
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exit(0); |
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case 'n': |
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if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0) |
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err(2, "%s", tty); |
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exit(1); |
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} |
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usage: (void)fprintf(stderr, "usage: mesg [n | y]\n"); |
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exit(2); |
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} |