Annotation of gforth/engine/select.c, revision 1.3

1.1       anton       1: /* select replacement for DOS computers for ms only
                      2: 
1.3     ! anton       3:   Copyright (C) 1995,1998 Free Software Foundation, Inc.
1.1       anton       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;
1.2       pazsan     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);
1.1       anton      41: 
1.2       pazsan     42:    do {
                     43:      gettimeofday(&time2,&zone1);
                     44:    } while(time2.tv_usec < time1.tv_usec &&
                     45:           time2.tv_sec == time1.tv_sec);
1.1       anton      46: }

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