isastream(3C)isastream(3C)NAMEisastream - test a file descriptor
SYNOPSIS
#include <sys/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 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 ALSOstreamio(7)
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