xref: /titanic_51/usr/src/lib/libc/port/gen/isatty.c (revision bbaa8b60dd95d714741fc474adad3cf710ef4efd)
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