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Annotation of src/usr.bin/mesg/mesg.c, Revision 1.4

1.4     ! flipk       1: /*     $OpenBSD: mesg.c,v 1.3 1997/01/15 23:42:53 millert Exp $        */
1.1       deraadt     2: /*     $NetBSD: mesg.c,v 1.4 1994/12/23 07:16:32 jtc Exp $     */
                      3:
                      4: /*
                      5:  * Copyright (c) 1987, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  * (c) UNIX System Laboratories, Inc.
                      8:  * All or some portions of this file are derived from material licensed
                      9:  * to the University of California by American Telephone and Telegraph
                     10:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
                     11:  * the permission of UNIX System Laboratories, Inc.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  * 3. All advertising materials mentioning features or use of this software
                     22:  *    must display the following acknowledgement:
                     23:  *     This product includes software developed by the University of
                     24:  *     California, Berkeley and its contributors.
                     25:  * 4. Neither the name of the University nor the names of its contributors
                     26:  *    may be used to endorse or promote products derived from this software
                     27:  *    without specific prior written permission.
                     28:  *
                     29:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     30:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     31:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     32:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     33:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     34:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     35:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     36:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     37:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     38:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     39:  * SUCH DAMAGE.
                     40:  */
                     41:
                     42: #ifndef lint
                     43: static char copyright[] =
                     44: "@(#) Copyright (c) 1987, 1993\n\
                     45:        The Regents of the University of California.  All rights reserved.\n";
                     46: #endif /* not lint */
                     47:
                     48: #ifndef lint
                     49: #if 0
                     50: static char sccsid[] = "@(#)mesg.c     8.2 (Berkeley) 1/21/94";
                     51: #endif
1.4     ! flipk      52: static char rcsid[] = "$OpenBSD: mesg.c,v 1.3 1997/01/15 23:42:53 millert Exp $";
1.1       deraadt    53: #endif /* not lint */
                     54:
                     55: #include <sys/types.h>
                     56: #include <sys/stat.h>
                     57:
                     58: #include <err.h>
                     59: #include <errno.h>
                     60: #include <stdio.h>
                     61: #include <stdlib.h>
                     62: #include <string.h>
                     63: #include <unistd.h>
                     64:
                     65: int
                     66: main(argc, argv)
                     67:        int argc;
                     68:        char *argv[];
                     69: {
                     70:        struct stat sb;
                     71:        char *tty;
                     72:        int ch;
                     73:
1.3       millert    74:        while ((ch = getopt(argc, argv, "")) != -1)
1.1       deraadt    75:                switch (ch) {
                     76:                case '?':
                     77:                default:
                     78:                        goto usage;
                     79:                }
                     80:        argc -= optind;
                     81:        argv += optind;
                     82:
                     83:        if ((tty = ttyname(STDERR_FILENO)) == NULL)
1.4     ! flipk      84:                err(2, "ttyname");
1.1       deraadt    85:        if (stat(tty, &sb) < 0)
1.4     ! flipk      86:                err(2, "%s", tty);
1.1       deraadt    87:
                     88:        if (*argv == NULL) {
                     89:                if (sb.st_mode & S_IWGRP) {
                     90:                        (void)fprintf(stderr, "is y\n");
                     91:                        exit(0);
                     92:                }
                     93:                (void)fprintf(stderr, "is n\n");
                     94:                exit(1);
                     95:        }
                     96:
                     97:        switch (*argv[0]) {
                     98:        case 'y':
                     99:                if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
1.4     ! flipk     100:                        err(2, "%s", tty);
1.1       deraadt   101:                exit(0);
                    102:        case 'n':
                    103:                if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
1.4     ! flipk     104:                        err(2, "%s", tty);
1.1       deraadt   105:                exit(1);
                    106:        }
                    107:
                    108: usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
                    109:        exit(2);
                    110: }