2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/portability/SysTime.h>
23 extern "C" int gettimeofday(timeval* tv, timezone*) {
24 constexpr auto posixWinFtOffset = 116444736000000000ULL;
28 GetSystemTimeAsFileTime(&ft);
29 uint64_t ns = *(uint64_t*)&ft;
30 tv->tv_usec = (long)((ns / 10ULL) % 1000000ULL);
31 tv->tv_sec = (long)((ns - posixWinFtOffset) / 10000000ULL);