blob: 34c9d390d7bcc76ac557292aedfd5974bd0f4e8f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Check to see if a file descriptor is that of a stream.
* Return 1 with errno set to 0 if it is. Otherwise,
* return 0 with errno set to 0.
* The only error returned is that case of a bad file desc.
*
*/
#pragma weak _isastream = isastream
#include "lint.h"
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <stropts.h>
int
isastream(int fd)
{
int rval;
rval = ioctl(fd, I_CANPUT, 0);
if (rval == -1 && errno == EBADF)
return (-1);
errno = 0;
if (rval == 0 || rval == 1)
return (1);
return (0);
}
|
