io.streams/fd-mixin.lisp

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