xref: /titanic_41/usr/src/lib/libbc/libc/gen/common/isatty.c (revision e4f5a11d4a234623168c1558fcdf4341e11769e1)
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, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 #pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from S5R3 1.7 */
23 /*	Copyright (c) 1984 AT&T	*/
24 /*	  All Rights Reserved  	*/
25 
26 
27 /*LINTLIBRARY*/
28 /*
29  * Returns 1 iff file is a tty
30  */
31 #include <sys/termio.h>
32 
33 extern int ioctl();
34 extern int errno;
35 
36 int
37 isatty(f)
38 int	f;
39 {
40 	struct termio tty;
41 	int err ;
42 
43 	err = errno;
44 	if(ioctl(f, TCGETA, &tty) < 0)
45 	{
46 		errno = err;
47 		return(0);
48 	}
49 	return(1);
50 }
51