21.9. Function EXT:MAKE-STREAM

Function EXT:MAKE-STREAM creates a Lisp stream out of an OS file descriptor: (EXT:MAKE-STREAM object &KEY :DIRECTION :ELEMENT-TYPE :EXTERNAL-FORMAT :BUFFERED)

object designates an OS handle (a file descriptor), and should be one of the following:

number
denotes the file descriptor of this value
:INPUT
denotes CLISP process standard input, that is, the file descriptor corresponding to stdin (0 on UNIX)
:OUTPUT
denotes CLISP process standard output, that is, the file descriptor corresponding to stdout (1 on UNIX)
:ERROR
denotes CLISP process error output, that is, the file descriptor corresponding to stderr (2 on UNIX)
STREAM
denotes the handle of this stream, which should be a FILE-STREAM or a SOCKET:SOCKET-STREAM

Beware of buffering!

When there are several Lisp STREAMs backed by the same OS file descriptor, the behavior may be highly confusing when some of the Lisp streams are :BUFFERED. Use FORCE-OUTPUT for output STREAMs, and bulk input for input STREAMs.

The handle is duplicated (with dup), so it is safe to CLOSE a STREAM returned by EXT:MAKE-STREAM.


These notes document CLISP version 2.49.60+Last modified: 2017-11-21