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annotate src/build-msvctools/compat/gettimeofday.c @ 3061:f8299bb6c872

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Initial support for native MSVC compilation. * add MSVC support files: compiler wrappers and support libraries * adapt libiconv to work with MSVC * adapt gettext to work with MSVC
author Michael Goffioul <michael.goffioul@gmail.com>
date Mon, 17 Jun 2013 22:43:11 -0400
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3061
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1 /*
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2 * gettimeofday
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3 * Implementation according to:
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4 * The Open Group Base Specifications Issue 6
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5 * IEEE Std 1003.1, 2004 Edition
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6 */
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7
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8 /*
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9 * THIS SOFTWARE IS NOT COPYRIGHTED
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10 *
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11 * This source code is offered for use in the public domain. You may
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12 * use, modify or distribute it freely.
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13 *
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14 * This code is distributed in the hope that it will be useful but
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15 * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
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16 * DISCLAIMED. This includes but is not limited to warranties of
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17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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18 *
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19 * Contributed by:
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20 * Danny Smith <dannysmith@users.sourceforge.net>
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21 */
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22
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23 #include <sys/time.h>
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24 #define WIN32_LEAN_AND_MEAN
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25 #include <windows.h>
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26
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27 /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
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28 #define _W32_FT_OFFSET (116444736000000000ULL)
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29
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30
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31 int __cdecl gettimeofday(struct timeval *__restrict__ tp,
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32 void *__restrict__ tzp __attribute__((unused)))
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33 {
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34 union {
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35 unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
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36 FILETIME ft;
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37 } _now;
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38
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39 if(tp)
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40 {
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41 GetSystemTimeAsFileTime (&_now.ft);
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42 tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
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43 tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
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44 }
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45 /* Always return 0 as per Open Group Base Specifications Issue 6.
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46 Do not set errno on error. */
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47 return 0;
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48 }
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