ISASTREAM(3P) POSIX Programmer's Manual ISASTREAM(3P)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.
NAMEisastream — test a file descriptor (STREAMS)
SYNOPSIS
#include <stropts.h>
int isastream(int fildes);
DESCRIPTION
The isastream() function shall test whether fildes, an open file
descriptor, is associated with a STREAMS-based file.
RETURN VALUE
Upon successful completion, isastream() shall return 1 if fildes refers
to a STREAMS-based file and 0 if not. Otherwise, isastream() shall
return −1 and set errno to indicate the error.
ERRORS
The isastream() function shall fail if:
EBADF The fildes argument is not a valid open file descriptor.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
The isastream() function may be removed in a future version.
SEE ALSO
The Base Definitions volume of POSIX.1‐2008, <stropts.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
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.ker‐
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 ISASTREAM(3P)
