1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate *
4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate * with the License.
8*7c478bd9Sstevel@tonic-gate *
9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate *
14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate *
20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate */
26*7c478bd9Sstevel@tonic-gate
27*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */
29*7c478bd9Sstevel@tonic-gate
30*7c478bd9Sstevel@tonic-gate
31*7c478bd9Sstevel@tonic-gate /*
32*7c478bd9Sstevel@tonic-gate * mesg -- set current tty to accept or
33*7c478bd9Sstevel@tonic-gate * forbid write permission.
34*7c478bd9Sstevel@tonic-gate *
35*7c478bd9Sstevel@tonic-gate * mesg [-y | -n | y | n]
36*7c478bd9Sstevel@tonic-gate * y allow messages
37*7c478bd9Sstevel@tonic-gate * n forbid messages
38*7c478bd9Sstevel@tonic-gate * return codes
39*7c478bd9Sstevel@tonic-gate * 0 if messages are ON or turned ON
40*7c478bd9Sstevel@tonic-gate * 1 if messages are OFF or turned OFF
41*7c478bd9Sstevel@tonic-gate * 2 if an error occurs
42*7c478bd9Sstevel@tonic-gate */
43*7c478bd9Sstevel@tonic-gate
44*7c478bd9Sstevel@tonic-gate #include <stdio.h>
45*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
46*7c478bd9Sstevel@tonic-gate #include <unistd.h>
47*7c478bd9Sstevel@tonic-gate #include <locale.h>
48*7c478bd9Sstevel@tonic-gate #include <libintl.h>
49*7c478bd9Sstevel@tonic-gate #include <sys/types.h>
50*7c478bd9Sstevel@tonic-gate #include <sys/stat.h>
51*7c478bd9Sstevel@tonic-gate
52*7c478bd9Sstevel@tonic-gate static void error(const char *s);
53*7c478bd9Sstevel@tonic-gate static void newmode(mode_t m);
54*7c478bd9Sstevel@tonic-gate static void usage(void);
55*7c478bd9Sstevel@tonic-gate
56*7c478bd9Sstevel@tonic-gate static char *tty;
57*7c478bd9Sstevel@tonic-gate
58*7c478bd9Sstevel@tonic-gate int
main(int argc,char * argv[])59*7c478bd9Sstevel@tonic-gate main(int argc, char *argv[])
60*7c478bd9Sstevel@tonic-gate {
61*7c478bd9Sstevel@tonic-gate int i, c, r = 0;
62*7c478bd9Sstevel@tonic-gate int action = 0;
63*7c478bd9Sstevel@tonic-gate struct stat sbuf;
64*7c478bd9Sstevel@tonic-gate
65*7c478bd9Sstevel@tonic-gate extern int optind;
66*7c478bd9Sstevel@tonic-gate
67*7c478bd9Sstevel@tonic-gate (void) setlocale(LC_ALL, "");
68*7c478bd9Sstevel@tonic-gate #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
69*7c478bd9Sstevel@tonic-gate #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */
70*7c478bd9Sstevel@tonic-gate #endif
71*7c478bd9Sstevel@tonic-gate (void) textdomain(TEXT_DOMAIN);
72*7c478bd9Sstevel@tonic-gate
73*7c478bd9Sstevel@tonic-gate /*
74*7c478bd9Sstevel@tonic-gate * Check stdin, stdout and stderr, in order, for a tty
75*7c478bd9Sstevel@tonic-gate */
76*7c478bd9Sstevel@tonic-gate for (i = 0; i <= 2; i++) {
77*7c478bd9Sstevel@tonic-gate if ((tty = ttyname(i)) != NULL)
78*7c478bd9Sstevel@tonic-gate break;
79*7c478bd9Sstevel@tonic-gate }
80*7c478bd9Sstevel@tonic-gate
81*7c478bd9Sstevel@tonic-gate if (stat(tty, &sbuf) < 0)
82*7c478bd9Sstevel@tonic-gate error("cannot stat");
83*7c478bd9Sstevel@tonic-gate
84*7c478bd9Sstevel@tonic-gate if (argc < 2) {
85*7c478bd9Sstevel@tonic-gate if (sbuf.st_mode & (S_IWGRP | S_IWOTH)) {
86*7c478bd9Sstevel@tonic-gate (void) printf("is y\n");
87*7c478bd9Sstevel@tonic-gate } else {
88*7c478bd9Sstevel@tonic-gate r = 1;
89*7c478bd9Sstevel@tonic-gate (void) printf("is n\n");
90*7c478bd9Sstevel@tonic-gate }
91*7c478bd9Sstevel@tonic-gate exit(r);
92*7c478bd9Sstevel@tonic-gate }
93*7c478bd9Sstevel@tonic-gate
94*7c478bd9Sstevel@tonic-gate while ((c = getopt(argc, argv, "yn")) != EOF) {
95*7c478bd9Sstevel@tonic-gate switch (c) {
96*7c478bd9Sstevel@tonic-gate case 'y':
97*7c478bd9Sstevel@tonic-gate if (action > 0)
98*7c478bd9Sstevel@tonic-gate usage();
99*7c478bd9Sstevel@tonic-gate
100*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP);
101*7c478bd9Sstevel@tonic-gate action++;
102*7c478bd9Sstevel@tonic-gate break;
103*7c478bd9Sstevel@tonic-gate
104*7c478bd9Sstevel@tonic-gate case 'n':
105*7c478bd9Sstevel@tonic-gate if (action > 0)
106*7c478bd9Sstevel@tonic-gate usage();
107*7c478bd9Sstevel@tonic-gate
108*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR);
109*7c478bd9Sstevel@tonic-gate r = 1;
110*7c478bd9Sstevel@tonic-gate action++;
111*7c478bd9Sstevel@tonic-gate break;
112*7c478bd9Sstevel@tonic-gate
113*7c478bd9Sstevel@tonic-gate case '?':
114*7c478bd9Sstevel@tonic-gate usage();
115*7c478bd9Sstevel@tonic-gate break;
116*7c478bd9Sstevel@tonic-gate }
117*7c478bd9Sstevel@tonic-gate }
118*7c478bd9Sstevel@tonic-gate
119*7c478bd9Sstevel@tonic-gate /*
120*7c478bd9Sstevel@tonic-gate * Required for POSIX.2
121*7c478bd9Sstevel@tonic-gate */
122*7c478bd9Sstevel@tonic-gate if (argc > optind) {
123*7c478bd9Sstevel@tonic-gate if (action > 0)
124*7c478bd9Sstevel@tonic-gate usage();
125*7c478bd9Sstevel@tonic-gate
126*7c478bd9Sstevel@tonic-gate switch (*argv[optind]) {
127*7c478bd9Sstevel@tonic-gate case 'y':
128*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP);
129*7c478bd9Sstevel@tonic-gate break;
130*7c478bd9Sstevel@tonic-gate
131*7c478bd9Sstevel@tonic-gate case 'n':
132*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR);
133*7c478bd9Sstevel@tonic-gate r = 1;
134*7c478bd9Sstevel@tonic-gate break;
135*7c478bd9Sstevel@tonic-gate
136*7c478bd9Sstevel@tonic-gate default:
137*7c478bd9Sstevel@tonic-gate usage();
138*7c478bd9Sstevel@tonic-gate break;
139*7c478bd9Sstevel@tonic-gate }
140*7c478bd9Sstevel@tonic-gate }
141*7c478bd9Sstevel@tonic-gate
142*7c478bd9Sstevel@tonic-gate return (r);
143*7c478bd9Sstevel@tonic-gate }
144*7c478bd9Sstevel@tonic-gate
145*7c478bd9Sstevel@tonic-gate void
error(const char * s)146*7c478bd9Sstevel@tonic-gate error(const char *s)
147*7c478bd9Sstevel@tonic-gate {
148*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, "mesg: ");
149*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, "%s\n", s);
150*7c478bd9Sstevel@tonic-gate exit(2);
151*7c478bd9Sstevel@tonic-gate }
152*7c478bd9Sstevel@tonic-gate
153*7c478bd9Sstevel@tonic-gate void
newmode(mode_t m)154*7c478bd9Sstevel@tonic-gate newmode(mode_t m)
155*7c478bd9Sstevel@tonic-gate {
156*7c478bd9Sstevel@tonic-gate if (chmod(tty, m) < 0)
157*7c478bd9Sstevel@tonic-gate error("cannot change mode");
158*7c478bd9Sstevel@tonic-gate }
159*7c478bd9Sstevel@tonic-gate
160*7c478bd9Sstevel@tonic-gate void
usage(void)161*7c478bd9Sstevel@tonic-gate usage(void)
162*7c478bd9Sstevel@tonic-gate {
163*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, gettext("usage: mesg [-y | -n | y | n]\n"));
164*7c478bd9Sstevel@tonic-gate exit(2);
165*7c478bd9Sstevel@tonic-gate }
166