NAME
isastream() — determine if a file descriptor refers to a STREAMS device or STREAMS-based pipe
SYNOPSIS
#include <stropts.h>
int isastream(int fd);
DESCRIPTION
The
isastream()
function tests whether an open file descriptor (fd)
corresponds to a
STREAMS device or
STREAMS-based pipe.
RETURN VALUE
Upon successful completion, the
isastream()
function returns a value of 1 when the file descriptor of the open file
specified by
fd
is a
STREAMS device or
STREAMS-based pipe, and 0 (zero)
if it is not a stream, but is a valid open file descriptor.
Otherwise, a value of -1 is returned, and
errno
is set to indicate the error.
ERRORS
If any of the following conditions occur, the
isastream()
function sets
errno
to the corresponding value:
- [EBADF]
The specified file descriptor does not refer to a valid open file.
STANDARDS COMPLIANCE
isastream(): SVID3
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