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Annotation of 43BSDReno/usr.bin/mesg/mesg.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1987 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1987 Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)mesg.c     4.6 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: /*
        !            31:  * mesg -- set current tty to accept or
        !            32:  *     forbid write permission.
        !            33:  *
        !            34:  *     mesg [y] [n]
        !            35:  *             y allow messages
        !            36:  *             n forbid messages
        !            37:  */
        !            38: 
        !            39: #include <sys/types.h>
        !            40: #include <sys/stat.h>
        !            41: #include <stdio.h>
        !            42: 
        !            43: static char *tty;
        !            44: 
        !            45: main(argc, argv)
        !            46:        int argc;
        !            47:        char **argv;
        !            48: {
        !            49:        struct stat sbuf;
        !            50:        char *ttyname();
        !            51: 
        !            52:        if (!(tty = ttyname(2))) {
        !            53:                fputs("mesg: not a device in /dev.\n", stderr);
        !            54:                exit(-1);
        !            55:        }
        !            56:        if (stat(tty, &sbuf) < 0) {
        !            57:                perror("mesg");
        !            58:                exit(-1);
        !            59:        }
        !            60:        if (argc < 2) {
        !            61:                if (sbuf.st_mode & 020) {
        !            62:                        fputs("is y\n", stderr);
        !            63:                        exit(0);
        !            64:                }
        !            65:                fputs("is n\n", stderr);
        !            66:                exit(1);
        !            67:        }
        !            68: #define        OTHER_WRITE     020
        !            69:        switch(*argv[1]) {
        !            70:        case 'y':
        !            71:                newmode(sbuf.st_mode | OTHER_WRITE);
        !            72:                exit(0);
        !            73:        case 'n':
        !            74:                newmode(sbuf.st_mode &~ OTHER_WRITE);
        !            75:                exit(1);
        !            76:        default:
        !            77:                fputs("usage: mesg [y] [n]\n", stderr);
        !            78:                exit(-1);
        !            79:        }
        !            80:        /*NOTREACHED*/
        !            81: }
        !            82: 
        !            83: static
        !            84: newmode(m)
        !            85:        u_short m;
        !            86: {
        !            87:        if (chmod(tty, m) < 0) {
        !            88:                perror("mesg");
        !            89:                exit(-1);
        !            90:        }
        !            91: }

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