gettimeofday.c

来自「打魔兽战网的都知道他是什么」· C语言 代码 · 共 73 行

/*
 * Copyright (C) 2000  Ross Combs ([e-mail])
 *
 * 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 "common/setup_before.h"
#ifndef HAVE_GETTIMEOFDAY

#include <errno.h>
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif
#ifdef HAVE_SYS_TIMEB_H
# include <sys/timeb.h>
#endif
#include "gettimeofday.h"
#include "common/setup_after.h"


extern int gettimeofday(struct timeval * tv, struct timezone * tz)
{
#ifdef HAVE_FTIME
    struct timeb tb;
#endif
    
    if (!tv)
    {
	errno = EFAULT;
	return -1;
    }
    
#ifdef HAVE_FTIME
    tb.millitm = 0; /* apparently the MS CRT version of this doesn't set this member */
    /* FIXME: what would be a more appropriate function for that platform? */
    ftime(&tb); /* FIXME: some versions are void return others int */
    
    tv->tv_sec  = tb.time;
    tv->tv_usec = ((long)tb.millitm)*1000;
    if (tz)
    {
	tz->tz_minuteswest = 0;
	tz->tz_dsttime     = 0;
    }
    
    return 0;
#else
# error "This program requires either gettimeofday() or ftime()"
#endif
}

#else
typedef int filenotempty; /* make ISO standard happy */
#endif