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ISASTREAM(P)               POSIX Programmer's Manual              ISASTREAM(P)

NAME
       isastream - 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
       None.

SEE ALSO
       The Base Definitions volume of IEEE Std 1003.1-2001, <stropts.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 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 .

IEEE/The Open Group                  2003                         ISASTREAM(P)

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