10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * CDDL HEADER START
30Sstevel@tonic-gate *
40Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*6812Sraf * Common Development and Distribution License (the "License").
6*6812Sraf * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate *
80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate * See the License for the specific language governing permissions
110Sstevel@tonic-gate * and limitations under the License.
120Sstevel@tonic-gate *
130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate *
190Sstevel@tonic-gate * CDDL HEADER END
200Sstevel@tonic-gate */
21*6812Sraf
220Sstevel@tonic-gate /*
23*6812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
240Sstevel@tonic-gate * Use is subject to license terms.
250Sstevel@tonic-gate */
260Sstevel@tonic-gate
270Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
280Sstevel@tonic-gate /* All Rights Reserved */
290Sstevel@tonic-gate
30*6812Sraf #pragma ident "%Z%%M% %I% %E% SMI"
310Sstevel@tonic-gate
320Sstevel@tonic-gate /*
330Sstevel@tonic-gate * Check to see if a file descriptor is that of a stream.
340Sstevel@tonic-gate * Return 1 with errno set to 0 if it is. Otherwise,
350Sstevel@tonic-gate * return 0 with errno set to 0.
360Sstevel@tonic-gate * The only error returned is that case of a bad file desc.
370Sstevel@tonic-gate *
380Sstevel@tonic-gate */
390Sstevel@tonic-gate
40*6812Sraf #pragma weak _isastream = isastream
410Sstevel@tonic-gate
42*6812Sraf #include "lint.h"
430Sstevel@tonic-gate #include <sys/types.h>
440Sstevel@tonic-gate #include <stdio.h>
450Sstevel@tonic-gate #include <errno.h>
460Sstevel@tonic-gate #include <stropts.h>
470Sstevel@tonic-gate
480Sstevel@tonic-gate int
isastream(int fd)490Sstevel@tonic-gate isastream(int fd)
500Sstevel@tonic-gate {
510Sstevel@tonic-gate int rval;
520Sstevel@tonic-gate
530Sstevel@tonic-gate rval = ioctl(fd, I_CANPUT, 0);
540Sstevel@tonic-gate if (rval == -1 && errno == EBADF)
550Sstevel@tonic-gate return (-1);
560Sstevel@tonic-gate
570Sstevel@tonic-gate errno = 0;
580Sstevel@tonic-gate if (rval == 0 || rval == 1)
590Sstevel@tonic-gate return (1);
600Sstevel@tonic-gate
610Sstevel@tonic-gate return (0);
620Sstevel@tonic-gate }
63