summaryrefslogtreecommitdiff
path: root/init/mesg.c
blob: 77bfe0e211d13e4fac662bf7bf7e2927d79f2c7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
/* vi: set sw=4 ts=4: */
/*
 * mesg implementation for busybox
 *
 * Copyright (c) 2002 Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include "busybox.h"

#ifdef USE_TTY_GROUP
#define S_IWGRP_OR_S_IWOTH	S_IWGRP
#else
#define S_IWGRP_OR_S_IWOTH	(S_IWGRP | S_IWOTH)
#endif

int mesg_main(int argc, char **argv);
int mesg_main(int argc, char **argv)
{
	struct stat sb;
	const char *tty;
	char c = 0;

	if (--argc == 0
	 || (argc == 1 && ((c = **++argv) == 'y' || c == 'n'))
	) {
		tty = ttyname(STDERR_FILENO);
		if (tty == NULL) {
			tty = "ttyname";
		} else if (stat(tty, &sb) == 0) {
			mode_t m;
			if (argc == 0) {
				puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
				return EXIT_SUCCESS;
			}
			m = (c == 'y') ? sb.st_mode | S_IWGRP_OR_S_IWOTH
			               : sb.st_mode & ~(S_IWGRP|S_IWOTH);
			if (chmod(tty, m) == 0) {
				return EXIT_SUCCESS;
			}
		}
		bb_perror_msg_and_die("%s", tty);
	}
	bb_show_usage();
}