File:  [gforth] / gforth / Attic / select.c
Revision 1.4: download - view: text, annotated - select for diffs
Mon Sep 23 20:42:01 1996 UTC (23 years, 1 month ago) by pazsan
Branches: MAIN
CVS tags: v0-3-0, v0-2-1, v0-2-0, HEAD
Improved DOS-compilability.

    1: /* select replacement for DOS computers for ms only
    2: 
    3:   Copyright (C) 1995 Free Software Foundation, Inc.
    4: 
    5:   This file is part of Gforth.
    6: 
    7:   Gforth is free software; you can redistribute it and/or
    8:   modify it under the terms of the GNU General Public License
    9:   as published by the Free Software Foundation; either version 2
   10:   of the License, or (at your option) any later version.
   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 General Public License
   18:   along with this program; if not, write to the Free Software
   19:   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: */
   21: 
   22: 
   23: #include <sys/time.h>
   24: 
   25: int select(int n, fd_set *a, fd_set *b, fd_set *c, struct timeval * timeout)
   26: {
   27:    struct timeval time1;
   28:    struct timeval time2;
   29:    struct timezone zone1;
   30: 
   31:    gettimeofday(&time1,&zone1);
   32:    time1.tv_sec += timeout->tv_sec;
   33:    time1.tv_usec += timeout->tv_usec;
   34:    if(time1.tv_usec >= 1000000)
   35:      {
   36: 	time1.tv_sec += time1.tv_usec / 1000000;
   37: 	time1.tv_usec %= 1000000;
   38:      }
   39:    do
   40:      {
   41: 	gettimeofday(&time2,&zone1);
   42:      }
   43:    while(time2.tv_sec < time1.tv_sec);
   44: 
   45:    do
   46:      {
   47: 	gettimeofday(&time2,&zone1);
   48:      }
   49:    while(time2.tv_usec < time1.tv_usec &&
   50: 	 time2.tv_sec == time1.tv_sec);
   51: 
   52: }

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