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// fd_set.cc
// robert - programme du robot 2005. {{{
//
// Copyright (C) 2005 Nicolas Schodet
//
// Robot APB Team/Efrei 2005.
//        Web: http://assos.efrei.fr/robot/
//      Email: robot AT efrei DOT fr
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// }}}
#include "fd_set.hh"
#include "utils/errno_exception.hh"

/// Wait for an read event or timeout in milliseconds, return true on read
/// event.
bool
FdSet::wait (int timeout/*-1*/)
{
    int r;
    if (timeout == -1)
      { 
        // Without timeout.
        r = select (FD_SETSIZE, get (), 0, 0, 0);
      }
    else
      { 
        // With timeout.
        struct timeval tv;
        tv.tv_sec = timeout / 1000;
        tv.tv_usec = (timeout % 1000) * 1000;
        r = select (FD_SETSIZE, get (), 0, 0, &tv);
      }
    if (r == -1)
        // Error.
        throw errno_exception (errno);
    else
	return r != 0;
}