io.multiplex/foreign-unix.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; indent-tabs-mode: nil -*-
   2 ;;;
   3 ;;; --- Linux-specific definitions.
   4 ;;;
   5 ;;; Copyright (C) 2005-2006, Matthew Backes  <lucca@accela.net>
   6 ;;; Copyright (C) 2005-2006, Dan Knapp  <dankna@accela.net>
   7 ;;;
   8 ;;; Permission is hereby granted, free of charge, to any person
   9 ;;; obtaining a copy of this software and associated documentation
  10 ;;; files (the "Software"), to deal in the Software without
  11 ;;; restriction, including without limitation the rights to use, copy,
  12 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
  13 ;;; of the Software, and to permit persons to whom the Software is
  14 ;;; furnished to do so, subject to the following conditions:
  15 ;;;
  16 ;;; The above copyright notice and this permission notice shall be
  17 ;;; included in all copies or substantial portions of the Software.
  18 ;;;
  19 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  20 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  22 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  23 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  24 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  26 ;;; DEALINGS IN THE SOFTWARE.
  27
  28 (in-package :io.multiplex)
  29
  30 ;;;; sys/select.h
  31
  32 ;;; FIXME: too low level?
  33 (defsyscall "select" :int
  34   "Scan for I/O activity on multiple file descriptors."
  35   (nfds      :int)
  36   (readfds   :pointer)
  37   (writefds  :pointer)
  38   (exceptfds :pointer)
  39   (timeout   :pointer))
  40
  41 ;;; FIXME: document these.
  42 (declaim (inline fd-zero fd-clr fd-set fd-isset))
  43
  44 (defun fd-zero (fd-set)
  45   (bzero fd-set size-of-fd-set)
  46   (values fd-set))
  47
  48 (defun copy-fd-set (from to)
  49   (nix:memcpy to from size-of-fd-set)
  50   (values to))
  51
  52 (deftype select-file-descriptor ()
  53   `(mod #.fd-setsize))
  54
  55 (defun fd-isset (fd fd-set)
  56   (multiple-value-bind (byte-off bit-off) (floor fd 8)
  57     (let ((oldval (mem-aref fd-set :uint8 byte-off)))
  58       (logbitp bit-off oldval))))
  59
  60 (defun fd-clr (fd fd-set)
  61   (multiple-value-bind (byte-off bit-off) (floor fd 8)
  62     (let ((oldval (mem-aref fd-set :uint8 byte-off)))
  63       (setf (mem-aref fd-set :uint8 byte-off)
  64             (logandc2 oldval (ash 1 bit-off)))))
  65   (values fd-set))
  66
  67 (defun fd-set (fd fd-set)
  68   (multiple-value-bind (byte-off bit-off) (floor fd 8)
  69     (let ((oldval (mem-aref fd-set :uint8 byte-off)))
  70       (setf (mem-aref fd-set :uint8 byte-off)
  71             (logior oldval (ash 1 bit-off)))))
  72   (values fd-set))
  73
  74 ;;;; sys/poll.h
  75
  76 (defsyscall "poll" :int
  77   "Scan for I/O activity on multiple file descriptors."
  78   (fds     :pointer)
  79   (nfds    nfds)
  80   (timeout :int))