isastream(3C)        COMPATIBILITY FUNCTIONS        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.

ERRORS
     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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