io.streams/gray/fd-mixin.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Indent-tabs-mode: NIL -*-
   2 ;;;
   3 ;;; fd-mixin.lisp --- insert description here
   4 ;;;
   5 ;;; Copyright (C) 2006-2007, Stelian Ionescu  <sionescu@common-lisp.net>
   6 ;;;
   7 ;;; This code is free software; you can redistribute it and/or
   8 ;;; modify it under the terms of the version 2.1 of
   9 ;;; the GNU Lesser General Public License as published by
  10 ;;; the Free Software Foundation, as clarified by the
  11 ;;; preamble found here:
  12 ;;;     http://opensource.franz.com/preamble.html
  13 ;;;
  14 ;;; This program is distributed in the hope that it will be useful,
  15 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;;; GNU General Public License for more details.
  18 ;;;
  19 ;;; You should have received a copy of the GNU Lesser General
  20 ;;; Public License along with this library; if not, write to the
  21 ;;; Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  22 ;;; Boston, MA 02110-1301, USA
  23
  24 (in-package :io.streams)
  25
  26 ;;;; Get and Set O_NONBLOCK
  27
  28 (defun %get-fd-nonblock-mode (fd)
  29   (let ((current-flags (nix:fcntl fd nix:f-getfl)))
  30     (logtest nix:o-nonblock current-flags)))
  31
  32 (defun %set-fd-nonblock-mode (fd mode)
  33   (let* ((current-flags (nix:fcntl fd nix:f-getfl))
  34          (new-flags (if mode
  35                         (logior current-flags nix:o-nonblock)
  36                         (logandc2 current-flags nix:o-nonblock))))
  37     (when (/= new-flags current-flags)
  38       (nix:fcntl fd nix:f-setfl new-flags))
  39     (values mode)))
  40
  41 (defmethod input-fd-non-blocking ((fd-mixin dual-channel-fd-mixin))
  42   (%get-fd-nonblock-mode (fd-of fd-mixin)))
  43
  44 (defmethod (setf input-fd-non-blocking) (mode (fd-mixin dual-channel-fd-mixin))
  45   (check-type mode boolean "a boolean value")
  46   (%set-fd-nonblock-mode (fd-of fd-mixin) mode))
  47
  48 (defmethod output-fd-non-blocking ((fd-mixin dual-channel-fd-mixin))
  49   (%get-fd-nonblock-mode (output-fd-of fd-mixin)))
  50
  51 (defmethod (setf output-fd-non-blocking) (mode (fd-mixin dual-channel-fd-mixin))
  52   (check-type mode boolean "a boolean value")
  53   (%set-fd-nonblock-mode (output-fd-of fd-mixin) mode))
  54
  55 (defmethod fd-non-blocking ((fd-mixin dual-channel-single-fd-mixin))
  56   (%get-fd-nonblock-mode (fd-of fd-mixin)))
  57
  58 (defmethod (setf fd-non-blocking) (mode (fd-mixin dual-channel-single-fd-mixin))
  59   (check-type mode boolean "a boolean value")
  60   (%set-fd-nonblock-mode (fd-of fd-mixin) mode))