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Annotation of 43BSDTahoe/usr.bin/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: char copyright[] =
                     20: "@(#) Copyright (c) 1987 Regents of the University of California.\n\
                     21:  All rights reserved.\n";
                     22: #endif /* not lint */
                     23: 
                     24: #ifndef lint
                     25: static char sccsid[] = "@(#)mesg.c     4.5 (Berkeley) 6/29/88";
                     26: #endif /* not lint */
                     27: 
                     28: /*
                     29:  * mesg -- set current tty to accept or
                     30:  *     forbid write permission.
                     31:  *
                     32:  *     mesg [y] [n]
                     33:  *             y allow messages
                     34:  *             n forbid messages
                     35:  */
                     36: 
                     37: #include <sys/types.h>
                     38: #include <sys/stat.h>
                     39: #include <stdio.h>
                     40: 
                     41: static char *tty;
                     42: 
                     43: main(argc, argv)
                     44:        int argc;
                     45:        char **argv;
                     46: {
                     47:        struct stat sbuf;
                     48:        char *ttyname();
                     49: 
                     50:        if (!(tty = ttyname(2))) {
                     51:                fputs("mesg: not a device in /dev.\n", stderr);
                     52:                exit(-1);
                     53:        }
                     54:        if (stat(tty, &sbuf) < 0) {
                     55:                perror("mesg");
                     56:                exit(-1);
                     57:        }
                     58:        if (argc < 2) {
                     59:                if (sbuf.st_mode & 020) {
                     60:                        fputs("is y\n", stderr);
                     61:                        exit(0);
                     62:                }
                     63:                fputs("is n\n", stderr);
                     64:                exit(1);
                     65:        }
                     66: #define        OTHER_WRITE     020
                     67:        switch(*argv[1]) {
                     68:        case 'y':
                     69:                newmode(sbuf.st_mode | OTHER_WRITE);
                     70:                exit(0);
                     71:        case 'n':
                     72:                newmode(sbuf.st_mode &~ OTHER_WRITE);
                     73:                exit(1);
                     74:        default:
                     75:                fputs("usage: mesg [y] [n]\n", stderr);
                     76:                exit(-1);
                     77:        }
                     78:        /*NOTREACHED*/
                     79: }
                     80: 
                     81: static
                     82: newmode(m)
                     83:        u_short m;
                     84: {
                     85:        if (chmod(tty, m) < 0) {
                     86:                perror("mesg");
                     87:                exit(-1);
                     88:        }
                     89: }

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