io.multiplex/utils.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Indent-tabs-mode: NIL -*-
   2 ;;;
   3 ;;; utils.lisp --- Miscellaneous utilities.
   4 ;;;
   5 ;;; Copyright (C) 2006-2008, 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.multiplex)
  25
  26 (defun timeout->timeval (timeout tv)
  27   (with-foreign-slots ((sec usec) tv timeval)
  28     (multiple-value-bind (%sec %usec) (decode-timeout timeout)
  29      (setf sec  %sec
  30            usec %usec))))
  31
  32 (defun timeout->timespec (timeout ts)
  33   (with-foreign-slots ((sec nsec) ts timespec)
  34     (multiple-value-bind (%sec %usec) (decode-timeout timeout)
  35       (setf sec  %sec
  36             nsec (* 1000 %usec)))))
  37
  38 (defun timeout->milisec (timeout)
  39   (if timeout
  40       (multiple-value-bind (sec usec) (decode-timeout timeout)
  41         (+ (* sec 1000)
  42            (truncate usec 1000)))
  43       -1))
  44
  45 (defmacro flags-case (mask &body clauses)
  46   (once-only (mask)
  47     `(progn ,@(loop :for clause :in clauses
  48                  :collect `(when (logtest ,(let ((flags (first clause)))
  49                                                 (if (listp flags)
  50                                                     `(logior ,@flags)
  51                                                     flags))
  52                                           ,mask)
  53                              ,(second clause))))))
  54
  55 (defmacro ignore-and-print-errors (&body body)
  56   `(handler-case (locally ,@body)
  57      (error (error)
  58        (warn "Caught a ~A: ~A, ignoring it."
  59              (type-of error) error))))