isastream(3C) — C LIBRARY FUNCTIONS
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.