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Annotation of 43BSDReno/usr.bin/mesg/mesg.c, revision 1.1.1.1

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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