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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 .