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117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1987, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <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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static void usage(void);
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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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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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usage();
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}
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argc -= optind;
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argv += optind;
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if ((tty = ttyname(STDIN_FILENO)) == NULL &&
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(tty = ttyname(STDOUT_FILENO)) == NULL &&
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(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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if (*argv == NULL) {
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if (sb.st_mode & S_IWGRP) {
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(void)puts("is y");
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exit(0);
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}
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(void)puts("is 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();
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return(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: mesg [n | y]\n");
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exit(2);
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}
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