File: select.c

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/* select replacement for DOS computers for ms only

  Copyright (C) 1995,1998,2000,2003,2007 Free Software Foundation, Inc.

  This file is part of Gforth.

  Gforth 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 3
  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, see http://www.gnu.org/licenses/.
*/


#include <sys/time.h>

int select(int n, fd_set *a, fd_set *b, fd_set *c, struct timeval * timeout)
{
   struct timeval time1;
   struct timeval time2;
   struct timezone zone1;

   gettimeofday(&time1,&zone1);
   time1.tv_sec += timeout->tv_sec;
   time1.tv_usec += timeout->tv_usec;
   if(time1.tv_usec >= 1000000) {
     time1.tv_sec += time1.tv_usec / 1000000;
     time1.tv_usec %= 1000000;
   }
   do {
     gettimeofday(&time2,&zone1);
   } while((time2.tv_sec < time1.tv_sec) ||
           ((time2.tv_usec < time1.tv_usec) &&
	    (time2.tv_sec == time1.tv_sec)));
}