1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #pragma weak _isatty = isatty 33 34 #include "lint.h" 35 #include <sys/types.h> 36 #include <sys/termio.h> 37 #include <errno.h> 38 #include <unistd.h> 39 40 /* 41 * Returns 1 iff file is a tty 42 */ 43 int 44 isatty(int f) 45 { 46 struct termio tty; 47 int err; 48 49 err = errno; 50 if (ioctl(f, TCGETA, &tty) < 0) { 51 errno = err; 52 return (0); 53 } 54 return (1); 55 } 56