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 Technol-
       ogy -- 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)