isastream(3C)                                          isastream(3C)


       NAME
             isastream - test a file descriptor

       SYNOPSIS
             #include <stropts.h>
             int isastream(int fildes);

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

          Return Values
             On success, isastream returns 1 if fildes represents a STREAMS
             file, and 0 if not.  On failure, isastream returns -1 and sets
             errno to identify the error.

          Errors
             Under the following conditions, isastream fails and sets errno
             to:

             EBADF        fildes is not a valid open file.

       REFERENCES
             streamio(7), unistd(4)
























                           Copyright 1994 Novell, Inc.               Page 1