source: trunk/src/kqueue.lisp

Last change on this file was 6, checked in by psmith, 16 years ago

Moved to standard directory structure

File size: 3.1 KB
Line 
1#|
2Copyright (c) 2006 Risto Laakso
3All rights reserved.
4
5Redistribution and use in source and binary forms, with or without
6modification, are permitted provided that the following conditions
7are met:
81. Redistributions of source code must retain the above copyright
9   notice, this list of conditions and the following disclaimer.
102. Redistributions in binary form must reproduce the above copyright
11   notice, this list of conditions and the following disclaimer in the
12   documentation and/or other materials provided with the distribution.
133. The name of the author may not be used to endorse or promote products
14   derived from this software without specific prior written permission.
15
16THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26|#
27(in-package :event-notification)
28
29#+(or darwin macosx freebsd)
30(progn
31
32  (defun make-event-queue ()
33    (%kqueue))
34
35  (defun ev-set (kevent ident filter flags fflags data udata)
36    (setf (foreign-slot-value kevent 'kevent 'ident) ident
37          (foreign-slot-value kevent 'kevent 'filter) filter
38          (foreign-slot-value kevent 'kevent 'flags) flags
39          (foreign-slot-value kevent 'kevent 'fflags) fflags
40          (foreign-slot-value kevent 'kevent 'data) data
41          (foreign-slot-value kevent 'kevent 'udata) udata))
42
43
44  (defun add-fd (event-queue fd mode &optional (trigger :edge))
45    "Add FD to EVENT-QUEUE in MODE (or :read :write)."
46    (with-foreign-object (ke 'kevent)
47      (ev-set ke fd
48              (ecase mode (:read +evfilt-read+) (:write +evfilt-write+))
49              (logior +ev-add+ (if (eql :edge trigger) +ev-clear+ 0)) 
50              0 0 (null-pointer))
51      (%kevent event-queue ke 1 (null-pointer) 0 (null-pointer)))
52    )
53
54  (defun remove-fd (event-queue fd mode)
55    "Remove FD from EVENT-QUEUE in MODE (or :read :write)."
56    (with-foreign-object (ke 'kevent)
57      (ev-set ke fd
58              (ecase mode (:read +evfilt-read+) (:write +evfilt-write+))
59              +ev-delete+ 0 0 (null-pointer))
60      (%kevent event-queue ke 1 (null-pointer) 0 (null-pointer))))
61
62
63
64  (define-condition poll-error (error) ())
65
66  (defun poll-events (event-queue)
67
68    (with-foreign-object (ke 'kevent 10)
69      (memzero ke (* +kevent-size+ 10))
70      (loop for res = (%kevent event-queue (null-pointer) 0 ke 10 (null-pointer)) do
71           (case res
72             (-1 (error 'poll-error))
73             (0 nil)
74             (t 
75              (let ((idents nil))
76                (loop for i from 0 below res do
77                     (push (foreign-slot-value (mem-aref ke 'kevent i) 'kevent 'ident) idents))
78                (return idents)))))))
79
80  )
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