isastream(3C)
test a file descriptor
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
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