isastream(3C)                    DG/UX 5.4.2                   isastream(3C)


NAME
       isastream - test a file descriptor

SYNOPSIS
       int isastream(int fildes);

DESCRIPTION
       The function isastream() determines if a file descriptor represents a
       STREAMS file.  fildes refers to an open file.

RETURN VALUE
       If successful, isastream() returns 1 if fildes represents a STREAMS
       file, and 0 if not.  On failure, isastream() returns -1 with errno
       set to indicate an error.

DIAGNOSTICS
       Under the following conditions, isastream() fails and sets errno to:

       EBADF        fildes is not a valid open file.

SEE ALSO
       streamio(7).
       in the Programmer's Guide: STREAMS


































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