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 #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 30*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 31*7c478bd9Sstevel@tonic-gate 32*7c478bd9Sstevel@tonic-gate 33*7c478bd9Sstevel@tonic-gate /* 34*7c478bd9Sstevel@tonic-gate * mesg -- set current tty to accept or 35*7c478bd9Sstevel@tonic-gate * forbid write permission. 36*7c478bd9Sstevel@tonic-gate * 37*7c478bd9Sstevel@tonic-gate * mesg [-y | -n | y | n] 38*7c478bd9Sstevel@tonic-gate * y allow messages 39*7c478bd9Sstevel@tonic-gate * n forbid messages 40*7c478bd9Sstevel@tonic-gate * return codes 41*7c478bd9Sstevel@tonic-gate * 0 if messages are ON or turned ON 42*7c478bd9Sstevel@tonic-gate * 1 if messages are OFF or turned OFF 43*7c478bd9Sstevel@tonic-gate * 2 if an error occurs 44*7c478bd9Sstevel@tonic-gate */ 45*7c478bd9Sstevel@tonic-gate 46*7c478bd9Sstevel@tonic-gate #include <stdio.h> 47*7c478bd9Sstevel@tonic-gate #include <stdlib.h> 48*7c478bd9Sstevel@tonic-gate #include <unistd.h> 49*7c478bd9Sstevel@tonic-gate #include <locale.h> 50*7c478bd9Sstevel@tonic-gate #include <libintl.h> 51*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 52*7c478bd9Sstevel@tonic-gate #include <sys/stat.h> 53*7c478bd9Sstevel@tonic-gate 54*7c478bd9Sstevel@tonic-gate static void error(const char *s); 55*7c478bd9Sstevel@tonic-gate static void newmode(mode_t m); 56*7c478bd9Sstevel@tonic-gate static void usage(void); 57*7c478bd9Sstevel@tonic-gate 58*7c478bd9Sstevel@tonic-gate static char *tty; 59*7c478bd9Sstevel@tonic-gate 60*7c478bd9Sstevel@tonic-gate int 61*7c478bd9Sstevel@tonic-gate main(int argc, char *argv[]) 62*7c478bd9Sstevel@tonic-gate { 63*7c478bd9Sstevel@tonic-gate int i, c, r = 0; 64*7c478bd9Sstevel@tonic-gate int action = 0; 65*7c478bd9Sstevel@tonic-gate struct stat sbuf; 66*7c478bd9Sstevel@tonic-gate 67*7c478bd9Sstevel@tonic-gate extern int optind; 68*7c478bd9Sstevel@tonic-gate 69*7c478bd9Sstevel@tonic-gate (void) setlocale(LC_ALL, ""); 70*7c478bd9Sstevel@tonic-gate #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */ 71*7c478bd9Sstevel@tonic-gate #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */ 72*7c478bd9Sstevel@tonic-gate #endif 73*7c478bd9Sstevel@tonic-gate (void) textdomain(TEXT_DOMAIN); 74*7c478bd9Sstevel@tonic-gate 75*7c478bd9Sstevel@tonic-gate /* 76*7c478bd9Sstevel@tonic-gate * Check stdin, stdout and stderr, in order, for a tty 77*7c478bd9Sstevel@tonic-gate */ 78*7c478bd9Sstevel@tonic-gate for (i = 0; i <= 2; i++) { 79*7c478bd9Sstevel@tonic-gate if ((tty = ttyname(i)) != NULL) 80*7c478bd9Sstevel@tonic-gate break; 81*7c478bd9Sstevel@tonic-gate } 82*7c478bd9Sstevel@tonic-gate 83*7c478bd9Sstevel@tonic-gate if (stat(tty, &sbuf) < 0) 84*7c478bd9Sstevel@tonic-gate error("cannot stat"); 85*7c478bd9Sstevel@tonic-gate 86*7c478bd9Sstevel@tonic-gate if (argc < 2) { 87*7c478bd9Sstevel@tonic-gate if (sbuf.st_mode & (S_IWGRP | S_IWOTH)) { 88*7c478bd9Sstevel@tonic-gate (void) printf("is y\n"); 89*7c478bd9Sstevel@tonic-gate } else { 90*7c478bd9Sstevel@tonic-gate r = 1; 91*7c478bd9Sstevel@tonic-gate (void) printf("is n\n"); 92*7c478bd9Sstevel@tonic-gate } 93*7c478bd9Sstevel@tonic-gate exit(r); 94*7c478bd9Sstevel@tonic-gate } 95*7c478bd9Sstevel@tonic-gate 96*7c478bd9Sstevel@tonic-gate while ((c = getopt(argc, argv, "yn")) != EOF) { 97*7c478bd9Sstevel@tonic-gate switch (c) { 98*7c478bd9Sstevel@tonic-gate case 'y': 99*7c478bd9Sstevel@tonic-gate if (action > 0) 100*7c478bd9Sstevel@tonic-gate usage(); 101*7c478bd9Sstevel@tonic-gate 102*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP); 103*7c478bd9Sstevel@tonic-gate action++; 104*7c478bd9Sstevel@tonic-gate break; 105*7c478bd9Sstevel@tonic-gate 106*7c478bd9Sstevel@tonic-gate case 'n': 107*7c478bd9Sstevel@tonic-gate if (action > 0) 108*7c478bd9Sstevel@tonic-gate usage(); 109*7c478bd9Sstevel@tonic-gate 110*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR); 111*7c478bd9Sstevel@tonic-gate r = 1; 112*7c478bd9Sstevel@tonic-gate action++; 113*7c478bd9Sstevel@tonic-gate break; 114*7c478bd9Sstevel@tonic-gate 115*7c478bd9Sstevel@tonic-gate case '?': 116*7c478bd9Sstevel@tonic-gate usage(); 117*7c478bd9Sstevel@tonic-gate break; 118*7c478bd9Sstevel@tonic-gate } 119*7c478bd9Sstevel@tonic-gate } 120*7c478bd9Sstevel@tonic-gate 121*7c478bd9Sstevel@tonic-gate /* 122*7c478bd9Sstevel@tonic-gate * Required for POSIX.2 123*7c478bd9Sstevel@tonic-gate */ 124*7c478bd9Sstevel@tonic-gate if (argc > optind) { 125*7c478bd9Sstevel@tonic-gate if (action > 0) 126*7c478bd9Sstevel@tonic-gate usage(); 127*7c478bd9Sstevel@tonic-gate 128*7c478bd9Sstevel@tonic-gate switch (*argv[optind]) { 129*7c478bd9Sstevel@tonic-gate case 'y': 130*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR | S_IWGRP); 131*7c478bd9Sstevel@tonic-gate break; 132*7c478bd9Sstevel@tonic-gate 133*7c478bd9Sstevel@tonic-gate case 'n': 134*7c478bd9Sstevel@tonic-gate newmode(S_IRUSR | S_IWUSR); 135*7c478bd9Sstevel@tonic-gate r = 1; 136*7c478bd9Sstevel@tonic-gate break; 137*7c478bd9Sstevel@tonic-gate 138*7c478bd9Sstevel@tonic-gate default: 139*7c478bd9Sstevel@tonic-gate usage(); 140*7c478bd9Sstevel@tonic-gate break; 141*7c478bd9Sstevel@tonic-gate } 142*7c478bd9Sstevel@tonic-gate } 143*7c478bd9Sstevel@tonic-gate 144*7c478bd9Sstevel@tonic-gate return (r); 145*7c478bd9Sstevel@tonic-gate } 146*7c478bd9Sstevel@tonic-gate 147*7c478bd9Sstevel@tonic-gate void 148*7c478bd9Sstevel@tonic-gate error(const char *s) 149*7c478bd9Sstevel@tonic-gate { 150*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, "mesg: "); 151*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, "%s\n", s); 152*7c478bd9Sstevel@tonic-gate exit(2); 153*7c478bd9Sstevel@tonic-gate } 154*7c478bd9Sstevel@tonic-gate 155*7c478bd9Sstevel@tonic-gate void 156*7c478bd9Sstevel@tonic-gate newmode(mode_t m) 157*7c478bd9Sstevel@tonic-gate { 158*7c478bd9Sstevel@tonic-gate if (chmod(tty, m) < 0) 159*7c478bd9Sstevel@tonic-gate error("cannot change mode"); 160*7c478bd9Sstevel@tonic-gate } 161*7c478bd9Sstevel@tonic-gate 162*7c478bd9Sstevel@tonic-gate void 163*7c478bd9Sstevel@tonic-gate usage(void) 164*7c478bd9Sstevel@tonic-gate { 165*7c478bd9Sstevel@tonic-gate (void) fprintf(stderr, gettext("usage: mesg [-y | -n | y | n]\n")); 166*7c478bd9Sstevel@tonic-gate exit(2); 167*7c478bd9Sstevel@tonic-gate } 168