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/usr/share/doc/racket/unix-socket/blueboxes.rktd is in racket-doc 6.7-3.

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((3) 0 () 1 ((q lib "racket/unix-socket.rkt")) () (h ! (equal) ((c def c (c (? . 0) q unix-socket-accept)) q (455 . 3)) ((c def c (c (? . 0) q unix-socket-connect)) q (42 . 3)) ((c def c (c (? . 0) q unix-socket-path?)) q (156 . 3)) ((c def c (c (? . 0) q unix-socket-listener?)) q (388 . 3)) ((c def c (c (? . 0) q unix-socket-available?)) q (0 . 2)) ((c def c (c (? . 0) q unix-socket-listen)) q (219 . 4))))
value
unix-socket-available? : boolean?
procedure
(unix-socket-connect socket-path) -> input-port? output-port?
  socket-path : unix-socket-path?
procedure
(unix-socket-path? v) -> boolean?
  v : any/c
procedure
(unix-socket-listen socket-path [backlog]) -> unix-socket-listener?
  socket-path : unix-socket-path?
  backlog : exact-nonnegative-integer? = 4
procedure
(unix-socket-listener? v) -> boolean?
  v : any/c
procedure
(unix-socket-accept listener) -> input-port? output-port
  listener : unix-socket-listener?