1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24*0Sstevel@tonic-gate * Use is subject to license terms.
25*0Sstevel@tonic-gate */
26*0Sstevel@tonic-gate
27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
30*0Sstevel@tonic-gate /* All Rights Reserved */
31*0Sstevel@tonic-gate
32*0Sstevel@tonic-gate
33*0Sstevel@tonic-gate /*
34*0Sstevel@tonic-gate * mesg -- set current tty to accept or
35*0Sstevel@tonic-gate * forbid write permission.
36*0Sstevel@tonic-gate *
37*0Sstevel@tonic-gate * mesg [-y | -n | y | n]
38*0Sstevel@tonic-gate * y allow messages
39*0Sstevel@tonic-gate * n forbid messages
40*0Sstevel@tonic-gate * return codes
41*0Sstevel@tonic-gate * 0 if messages are ON or turned ON
42*0Sstevel@tonic-gate * 1 if messages are OFF or turned OFF
43*0Sstevel@tonic-gate * 2 if an error occurs
44*0Sstevel@tonic-gate */
45*0Sstevel@tonic-gate
46*0Sstevel@tonic-gate #include <stdio.h>
47*0Sstevel@tonic-gate #include <stdlib.h>
48*0Sstevel@tonic-gate #include <unistd.h>
49*0Sstevel@tonic-gate #include <locale.h>
50*0Sstevel@tonic-gate #include <libintl.h>
51*0Sstevel@tonic-gate #include <sys/types.h>
52*0Sstevel@tonic-gate #include <sys/stat.h>
53*0Sstevel@tonic-gate
54*0Sstevel@tonic-gate static void error(const char *s);
55*0Sstevel@tonic-gate static void newmode(mode_t m);
56*0Sstevel@tonic-gate static void usage(void);
57*0Sstevel@tonic-gate
58*0Sstevel@tonic-gate static char *tty;
59*0Sstevel@tonic-gate
60*0Sstevel@tonic-gate int
main(int argc,char * argv[])61*0Sstevel@tonic-gate main(int argc, char *argv[])
62*0Sstevel@tonic-gate {
63*0Sstevel@tonic-gate int i, c, r = 0;
64*0Sstevel@tonic-gate int action = 0;
65*0Sstevel@tonic-gate struct stat sbuf;
66*0Sstevel@tonic-gate
67*0Sstevel@tonic-gate extern int optind;
68*0Sstevel@tonic-gate
69*0Sstevel@tonic-gate (void) setlocale(LC_ALL, "");
70*0Sstevel@tonic-gate #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
71*0Sstevel@tonic-gate #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */
72*0Sstevel@tonic-gate #endif
73*0Sstevel@tonic-gate (void) textdomain(TEXT_DOMAIN);
74*0Sstevel@tonic-gate
75*0Sstevel@tonic-gate /*
76*0Sstevel@tonic-gate * Check stdin, stdout and stderr, in order, for a tty
77*0Sstevel@tonic-gate */
78*0Sstevel@tonic-gate for (i = 0; i <= 2; i++) {
79*0Sstevel@tonic-gate if ((tty = ttyname(i)) != NULL)
80*0Sstevel@tonic-gate break;
81*0Sstevel@tonic-gate }
82*0Sstevel@tonic-gate
83*0Sstevel@tonic-gate if (stat(tty, &sbuf) < 0)
84*0Sstevel@tonic-gate error("cannot stat");
85*0Sstevel@tonic-gate
86*0Sstevel@tonic-gate if (argc < 2) {
87*0Sstevel@tonic-gate if (sbuf.st_mode & (S_IWGRP | S_IWOTH)) {
88*0Sstevel@tonic-gate (void) printf("is y\n");
89*0Sstevel@tonic-gate } else {
90*0Sstevel@tonic-gate r = 1;
91*0Sstevel@tonic-gate (void) printf("is n\n");
92*0Sstevel@tonic-gate }
93*0Sstevel@tonic-gate exit(r);
94*0Sstevel@tonic-gate }
95*0Sstevel@tonic-gate
96*0Sstevel@tonic-gate while ((c = getopt(argc, argv, "yn")) != EOF) {
97*0Sstevel@tonic-gate switch (c) {
98*0Sstevel@tonic-gate case 'y':
99*0Sstevel@tonic-gate if (action > 0)
100*0Sstevel@tonic-gate usage();
101*0Sstevel@tonic-gate
102*0Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP);
103*0Sstevel@tonic-gate action++;
104*0Sstevel@tonic-gate break;
105*0Sstevel@tonic-gate
106*0Sstevel@tonic-gate case 'n':
107*0Sstevel@tonic-gate if (action > 0)
108*0Sstevel@tonic-gate usage();
109*0Sstevel@tonic-gate
110*0Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR);
111*0Sstevel@tonic-gate r = 1;
112*0Sstevel@tonic-gate action++;
113*0Sstevel@tonic-gate break;
114*0Sstevel@tonic-gate
115*0Sstevel@tonic-gate case '?':
116*0Sstevel@tonic-gate usage();
117*0Sstevel@tonic-gate break;
118*0Sstevel@tonic-gate }
119*0Sstevel@tonic-gate }
120*0Sstevel@tonic-gate
121*0Sstevel@tonic-gate /*
122*0Sstevel@tonic-gate * Required for POSIX.2
123*0Sstevel@tonic-gate */
124*0Sstevel@tonic-gate if (argc > optind) {
125*0Sstevel@tonic-gate if (action > 0)
126*0Sstevel@tonic-gate usage();
127*0Sstevel@tonic-gate
128*0Sstevel@tonic-gate switch (*argv[optind]) {
129*0Sstevel@tonic-gate case 'y':
130*0Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP);
131*0Sstevel@tonic-gate break;
132*0Sstevel@tonic-gate
133*0Sstevel@tonic-gate case 'n':
134*0Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR);
135*0Sstevel@tonic-gate r = 1;
136*0Sstevel@tonic-gate break;
137*0Sstevel@tonic-gate
138*0Sstevel@tonic-gate default:
139*0Sstevel@tonic-gate usage();
140*0Sstevel@tonic-gate break;
141*0Sstevel@tonic-gate }
142*0Sstevel@tonic-gate }
143*0Sstevel@tonic-gate
144*0Sstevel@tonic-gate return (r);
145*0Sstevel@tonic-gate }
146*0Sstevel@tonic-gate
147*0Sstevel@tonic-gate void
error(const char * s)148*0Sstevel@tonic-gate error(const char *s)
149*0Sstevel@tonic-gate {
150*0Sstevel@tonic-gate (void) fprintf(stderr, "mesg: ");
151*0Sstevel@tonic-gate (void) fprintf(stderr, "%s\n", s);
152*0Sstevel@tonic-gate exit(2);
153*0Sstevel@tonic-gate }
154*0Sstevel@tonic-gate
155*0Sstevel@tonic-gate void
newmode(mode_t m)156*0Sstevel@tonic-gate newmode(mode_t m)
157*0Sstevel@tonic-gate {
158*0Sstevel@tonic-gate if (chmod(tty, m) < 0)
159*0Sstevel@tonic-gate error("cannot change mode");
160*0Sstevel@tonic-gate }
161*0Sstevel@tonic-gate
162*0Sstevel@tonic-gate void
usage(void)163*0Sstevel@tonic-gate usage(void)
164*0Sstevel@tonic-gate {
165*0Sstevel@tonic-gate (void) fprintf(stderr, gettext("usage: mesg [-y | -n | y | n]\n"));
166*0Sstevel@tonic-gate exit(2);
167*0Sstevel@tonic-gate }
168