;; Taken from the chicken 3.x daemon egg
;;
;; Copyright (c) 2007  Hans Bulfone <jsb@nil.at>
;; All rights reserved.
;; 
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are met:
;; 
;;     * Redistributions of source code must retain the above copyright notice,
;;       this list of conditions and the following disclaimer.
;;     * Redistributions in binary form must reproduce the above copyright
;;       notice, this list of conditions and the following disclaimer in the
;;       documentation and/or other materials provided with the distribution.
;;     * Neither the name of the author nor the names of his contributors may
;;       be used to endorse or promote products derived from this software
;;       without specific prior written permission.
;; 
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
;; THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
;; PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
;; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
;; EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
;; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
;; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
;; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
;; ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

(declare (unit daemon))

(define (daemon:ize)
  (change-directory "/")
  (let ((fd-r (file-open "/dev/null" open/rdonly))
        (fd-w (file-open "/dev/null" open/wronly)))
    (duplicate-fileno fd-r 0)
    (duplicate-fileno fd-w 1)
    (file-close fd-r)
    (file-close fd-w))
  (let ((child-pid (process-fork)))
    (if (not (zero? child-pid))
        (exit 0)))
  (create-session)
  (duplicate-fileno 1 2)
  (void))