'\" te
.\"  Copyright 1989 AT&T  Copyright (c) 2002, Sun Microsystems, Inc.  All Rights Reserved
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.\" 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.
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.TH ISASTREAM 3C "Jul 24, 2002"
.SH NAME
isastream \- test a file descriptor
.SH SYNOPSIS
.LP
.nf
#include <stropts.h>

\fBint\fR \fBisastream\fR(\fBint\fR \fIfildes\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The  \fBisastream()\fR function determines if a file descriptor represents a
STREAMS file. The \fIfildes\fR argument refers to an open file descriptor.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBisastream()\fR returns \fB1\fR if \fIfildes\fR
represents a STREAMS file, and \fB0\fR if it does not.  Otherwise, \fB\(mi1\fR
is return and \fBerrno\fR is set to indicate the error.
.SH ERRORS
.sp
.LP
The \fBisastream()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEBADF\fR\fR
.ad
.RS 9n
The \fIfildes\fR argument is not a valid file descriptor.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBattributes\fR(5), , \fBstandards\fR(5), \fBstreamio\fR(7I)
.sp
.LP
\fISTREAMS Programming Guide\fR