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 .