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 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 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 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 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