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dvbd / src / select.h @ 904d298f

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// -*- c++ -*-
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/*
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  Copyright 2003 John Knottenbelt
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  This program is free software; you can redistribute it and/or modify
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  it under the terms of the GNU General Public License as published by
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  the Free Software Foundation; either version 2 of the License, or
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  (at your option) any later version.
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  This program is distributed in the hope that it will be useful,
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  GNU General Public License for more details.
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  You should have received a copy of the GNU General Public License
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  along with this program; if not, write to the Free Software
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  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
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*/
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#if !defined __SELECT_H
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#define __SELECT_H
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#include <sys/select.h>                // for fd_set below
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class Select;
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// Selectable interface
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class Selectable {
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public:
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  virtual void addSelectFDs(Select &) const = 0;
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  virtual bool isReady(const Select &) const = 0;
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};
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// Class wrapping select() system call
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class Select {
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public:
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  Select();
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  void clearFDs();
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  void addReadFD(int fd);
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  void addWriteFD(int fd);
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  void addExceptFD(int fd);
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  void addAlarm(long tv_sec, long tv_usec);
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  int wait();
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  bool readyToRead(int fd) const;
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  bool readyToWrite(int fd) const;
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  bool readyToExcept(int fd) const;
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private:
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  int maxFD;
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  fd_set readfds, writefds, exceptfds;
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  long tv_sec, tv_usec;
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  void setMaxFD(int fd);
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};
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#endif