gettimeofday.c

这是一个完全开放的

/*
 * $PostgreSQL: /cvsroot/pgsql-server/src/port/gettimeofday.c,v 1.3 2003/11/29 19:52:13 pgsql Exp $
 *
 * Copyright (c) 2003 SRA, Inc.
 * Copyright (c) 2003 SKC, Inc.
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose, without fee, and without a
 * written agreement is hereby granted, provided that the above
 * copyright notice and this paragraph and the following two
 * paragraphs appear in all copies.
 *
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
 * INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
 * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
 * DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS
 * IS" BASIS, AND THE AUTHOR HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE,
 * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifndef HAVE_GETTIMEOFDAY

#include "ac-stdint.h"

#include <time.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/timeb.h>
#include <windows.h>

#include "subst.h"

/* FILETIME of Jan 1 1970 00:00:00. */
static const unsigned __int64 epoch = 116444736000000000L;

/*
 * timezone information is stored outside the kernel so tzp isn't used anymore.
 */

int
gettimeofday(struct timeval * tp, struct timezone * tzp)
{
	FILETIME	file_time;
	SYSTEMTIME	system_time;
	ULARGE_INTEGER ularge;

	GetSystemTime(&system_time);
	SystemTimeToFileTime(&system_time, &file_time);
	ularge.LowPart = file_time.dwLowDateTime;
	ularge.HighPart = file_time.dwHighDateTime;

	tp->tv_sec = (long) ((ularge.QuadPart - epoch) / 10000000L);
	tp->tv_usec = (long) (system_time.wMilliseconds * 1000);

	return 0;
}

#endif