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+'\" et
+.TH ISASTREAM "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+isastream
+\(em test a file descriptor (\fBSTREAMS\fP)
+.SH SYNOPSIS
+.LP
+.nf
+#include <stropts.h>
+.P
+int isastream(int \fIfildes\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIisastream\fR()
+function shall test whether
+.IR fildes ,
+an open file descriptor, is associated with a STREAMS-based file.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fIisastream\fR()
+shall return 1 if
+.IR fildes
+refers to a STREAMS-based file and 0 if not. Otherwise,
+\fIisastream\fR()
+shall return \-1 and set
+.IR errno
+to indicate the error.
+.SH ERRORS
+The
+\fIisastream\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid open file descriptor.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+The
+\fIisastream\fR()
+function may be removed in a future version.
+.SH "SEE ALSO"
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<stropts.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .