111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1987 Regents of the University of California.
|
|
* All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* 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
|
|
char copyright[] =
|
|
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
|
|
All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
/*static char sccsid[] = "from: @(#)mesg.c 4.7 (Berkeley) 3/1/91";*/
|
|
static char rcsid[] = "$Id: mesg.c,v 1.3 1994/05/17 04:15:59 cgd Exp $";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* mesg -- set current tty to accept or
|
|
* forbid write permission.
|
|
*
|
|
* mesg [y] [n]
|
|
* y allow messages
|
|
* n forbid messages
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <stdio.h>
|
|
|
|
static char *tty;
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct stat sbuf;
|
|
char *ttyname();
|
|
|
|
if (!(tty = ttyname(2))) {
|
|
fputs("mesg: not a device in /dev.\n", stderr);
|
|
exit(-1);
|
|
}
|
|
if (stat(tty, &sbuf) < 0) {
|
|
perror("mesg");
|
|
exit(-1);
|
|
}
|
|
if (argc < 2) {
|
|
if (sbuf.st_mode & 020) {
|
|
fputs("is y\n", stderr);
|
|
exit(0);
|
|
}
|
|
fputs("is n\n", stderr);
|
|
exit(1);
|
|
}
|
|
#define OTHER_WRITE 020
|
|
switch(*argv[1]) {
|
|
case 'y':
|
|
newmode(sbuf.st_mode | OTHER_WRITE);
|
|
exit(0);
|
|
case 'n':
|
|
newmode(sbuf.st_mode &~ OTHER_WRITE);
|
|
exit(1);
|
|
default:
|
|
fputs("usage: mesg [y] [n]\n", stderr);
|
|
exit(-1);
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
newmode(m)
|
|
u_short m;
|
|
{
|
|
if (chmod(tty, m) < 0) {
|
|
perror("mesg");
|
|
exit(-1);
|
|
}
|
|
}
|