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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 dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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(3P)