File:  [gforth] / gforth / engine / select.c
Revision 1.2: download - view: text, annotated - select for diffs
Sun Nov 22 23:18:11 1998 UTC (23 years, 2 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Added system-specific options for C-part of primitives

    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:      time1.tv_sec += time1.tv_usec / 1000000;
   36:      time1.tv_usec %= 1000000;
   37:    }
   38:    do {
   39:      gettimeofday(&time2,&zone1);
   40:    } while(time2.tv_sec < time1.tv_sec);
   41: 
   42:    do {
   43:      gettimeofday(&time2,&zone1);
   44:    } while(time2.tv_usec < time1.tv_usec &&
   45: 	   time2.tv_sec == time1.tv_sec);
   46: }

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