source: trunk/minix/commands/simple/mesg.c@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 1.1 KB
Line 
1/* mesg - enable or disable communications. Author: John J. Ribera */
2
3/*
4 * mesg - enable or disable communications.
5 *
6 * Usage: mesg [ y | n ]
7 *
8 * 'mesg n' will turn off group and world permissions of the
9 * user's terminal.
10 * 'mesg y' will enable group and world to write to the user's
11 * tty.
12 * mesg with no parameters will put the writeable status
13 * onto stdout.
14 *
15 * Author: John J. Ribera, Jr. 09/09/90
16 */
17#include <sys/types.h>
18#include <sys/stat.h>
19#include <stdio.h>
20#include <stdlib.h>
21#include <unistd.h>
22
23_PROTOTYPE( int main, (int argc, char *argv []) );
24
25int main(argc, argv)
26int argc;
27char *argv[];
28{
29 struct stat statb;
30 char *tty_name;
31
32 if ((tty_name = ttyname(0)) == NULL) exit(2);
33 if (stat(tty_name, &statb) == -1) exit(2);
34 if (--argc) {
35 if (*argv[1] == 'n') statb.st_mode = 0600;
36 else if (*argv[1] == 'y') statb.st_mode = 0620;
37 else {
38 fprintf(stderr, "mesg: usage: mesg [n|y]\n");
39 exit(2);
40 }
41 if (chmod(tty_name, statb.st_mode) == -1) exit(2);
42 } else printf((statb.st_mode & 020) ? "is y\n" : "is n\n");
43
44 if (statb.st_mode & 020) exit(0);
45
46 exit(1);
47}
48
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