fd-gray's Introduction

fd-gray

fd-gray streams are binary gray streams operating on (unsigned-byte 8) data using unistd:read, unistd:write and unistd:close to embed Unix file descriptors in standard Common Lisp streams.

fd-gray:input-stream fd --> stream

Creates an input stream for file descriptor fd.

(let ((seq (make-array 128 '(unsigned-byte 8))))
  (read-sequence seq (fd-gray:input-stream 0)))

fd-gray:output-stream fd --> stream

Creates an output stream for file descriptor fd.

(let ((seq (make-array 128 '(unsigned-byte 8))))
  (write-sequence seq (fd-gray:output-stream 1)))

fd-gray:io-stream fd --> stream

Creates an input/output stream for file descriptor fd.

(let ((seq (make-array 128 '(unsigned-byte 8))
      (stream (fd-gray:io-stream (fcntl:open "file.bin" fcntl:+o-rdwr+))))
  (read-sequence seq stream)
  (write-sequence seq stream))

fd-gray:with-input-stream (var fd) &body body --> result

Creates an input stream for file descriptor fd that will be closed returning from body.

(fd-gray:with-input-stream (in (fcntl:open "file.bin" fcntl:+o-rdonly+))
  (let ((seq (make-array 128 '(unsigned-byte 8))))
    (read-sequence seq in)
    seq))

fd-gray:with-output-stream (var fd) &body body --> result

Creates an output stream for file descriptor fd that will be closed returning from body.

(let ((seq (make-array 128 '(unsigned-byte 8))))
  (fd-gray:with-output-stream (out (fcntl:open "file.bin" fcntl:+o-wronly+))
    (write-sequence seq out)))

fd-gray:with-io-stream (var fd) &body body --> result

Creates an input/output stream for file descriptor fd that will be closed returning from body.

(fd-gray:with-io-stream (out (fcntl:open "file.bin" fcntl:+o-rdwr+))
  (let ((seq (make-array 128 '(unsigned-byte 8))))
    (read-sequence seq out)
    (write-sequence seq out)))

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