From 726f69e29ca9d4842f3acb20fffd2466fda62c09 Mon Sep 17 00:00:00 2001 From: Karel Zak Date: Thu, 7 Dec 2006 00:25:33 +0100 Subject: Imported from util-linux-2.5 tarball. --- login-utils/mesg.c | 138 +++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 103 insertions(+), 35 deletions(-) (limited to 'login-utils/mesg.c') diff --git a/login-utils/mesg.c b/login-utils/mesg.c index 07c5fad1f..79d3ef21e 100644 --- a/login-utils/mesg.c +++ b/login-utils/mesg.c @@ -1,44 +1,112 @@ /* - * mesg.c The "mesg" utility. Gives / restrict access to - * your terminal by others. + * Copyright (c) 1987, 1993 + * The 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. * - * Usage: mesg [y|n]. - * Without arguments prints out the current settings. + * 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. + * + * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux + * */ -#include + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1987, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)mesg.c 8.2 (Berkeley) 1/21/94"; +#endif /* not lint */ + +#include #include -#include + +#include #include +#include +#include +#include #include -char *Version = "@(#) mesg 1.0 08-12-92 MvS"; - -int main(int argc, char **argv) +int +main(argc, argv) + int argc; + char *argv[]; { - struct stat st; - - if (!isatty(0)) { - /* Or should we look in /etc/utmp? */ - fprintf(stderr, "stdin: is not a tty"); - return(1); - } - - if (fstat(0, &st) < 0) { - perror("fstat"); - return(1); - } - if (argc < 2) { - printf("Is %s\n", ((st.st_mode & 022) == 022) ? "y" : "n"); - return(0); - } - if (argc > 2 || (argv[1][0] != 'y' && argv[1][0] != 'n')) { - fprintf(stderr, "Usage: mesg [y|n]\n"); - return(1); - } - if (argv[1][0] == 'y') - st.st_mode |= 022; - else - st.st_mode &= ~022; - fchmod(0, st.st_mode); - return(0); + struct stat sb; + char *tty; + int ch; + + while ((ch = getopt(argc, argv, "")) != EOF) + switch (ch) { + case '?': + default: + goto usage; + } + argc -= optind; + argv += optind; + + if ((tty = ttyname(STDERR_FILENO)) == NULL) + err(1, "ttyname"); + if (stat(tty, &sb) < 0) + err(1, "%s", tty); + + if (*argv == NULL) { + if (sb.st_mode & (S_IWGRP | S_IWOTH)) { + (void)fprintf(stderr, "is y\n"); + exit(0); + } + (void)fprintf(stderr, "is n\n"); + exit(1); + } + + switch (*argv[0]) { + case 'y': +#ifdef USE_TTY_GROUP + if (chmod(tty, sb.st_mode | S_IWGRP) < 0) + err(1, "%s", tty); +#else + if (chmod(tty, sb.st_mode | S_IWGRP | S_IWOTH) < 0) + err(1, "%s", tty); +#endif + exit(0); + case 'n': + if (chmod(tty, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0) + err(1, "%s", tty); + exit(1); + } + +usage: (void)fprintf(stderr, "usage: mesg [y | n]\n"); + exit(2); } -- cgit v1.2.3-55-g7522