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Annotation of src/usr.bin/mesg/mesg.c, Revision 1.1

1.1     ! deraadt     1: /*     $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $     */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1987, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  * (c) UNIX System Laboratories, Inc.
        !             7:  * All or some portions of this file are derived from material licensed
        !             8:  * to the University of California by American Telephone and Telegraph
        !             9:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            10:  * the permission of UNIX System Laboratories, Inc.
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. All advertising materials mentioning features or use of this software
        !            21:  *    must display the following acknowledgement:
        !            22:  *     This product includes software developed by the University of
        !            23:  *     California, Berkeley and its contributors.
        !            24:  * 4. Neither the name of the University nor the names of its contributors
        !            25:  *    may be used to endorse or promote products derived from this software
        !            26:  *    without specific prior written permission.
        !            27:  *
        !            28:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            29:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            30:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            31:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            32:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            33:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            34:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            35:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            36:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            37:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            38:  * SUCH DAMAGE.
        !            39:  */
        !            40:
        !            41: #ifndef lint
        !            42: static char copyright[] =
        !            43: "@(#) Copyright (c) 1987, 1993\n\
        !            44:        The Regents of the University of California.  All rights reserved.\n";
        !            45: #endif /* not lint */
        !            46:
        !            47: #ifndef lint
        !            48: #if 0
        !            49: static char sccsid[] = "@(#)mesg.c     8.2 (Berkeley) 1/21/94";
        !            50: #endif
        !            51: static char rcsid[] = "$NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $";
        !            52: #endif /* not lint */
        !            53:
        !            54: #include <sys/types.h>
        !            55: #include <sys/stat.h>
        !            56:
        !            57: #include <err.h>
        !            58: #include <errno.h>
        !            59: #include <stdio.h>
        !            60: #include <stdlib.h>
        !            61: #include <string.h>
        !            62: #include <unistd.h>
        !            63:
        !            64: int
        !            65: main(argc, argv)
        !            66:        int argc;
        !            67:        char *argv[];
        !            68: {
        !            69:        struct stat sb;
        !            70:        char *tty;
        !            71:        int ch;
        !            72:
        !            73:        while ((ch = getopt(argc, argv, "")) != EOF)
        !            74:                switch (ch) {
        !            75:                case '?':
        !            76:                default:
        !            77:                        goto usage;
        !            78:                }
        !            79:        argc -= optind;
        !            80:        argv += optind;
        !            81:
        !            82:        if ((tty = ttyname(STDERR_FILENO)) == NULL)
        !            83:                err(1, "ttyname");
        !            84:        if (stat(tty, &sb) < 0)
        !            85:                err(1, "%s", tty);
        !            86:
        !            87:        if (*argv == NULL) {
        !            88:                if (sb.st_mode & S_IWGRP) {
        !            89:                        (void)fprintf(stderr, "is y\n");
        !            90:                        exit(0);
        !            91:                }
        !            92:                (void)fprintf(stderr, "is n\n");
        !            93:                exit(1);
        !            94:        }
        !            95:
        !            96:        switch (*argv[0]) {
        !            97:        case 'y':
        !            98:                if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
        !            99:                        err(1, "%s", tty);
        !           100:                exit(0);
        !           101:        case 'n':
        !           102:                if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
        !           103:                        err(1, "%s", tty);
        !           104:                exit(1);
        !           105:        }
        !           106:
        !           107: usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
        !           108:        exit(2);
        !           109: }