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43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
// Copyright 2015 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/win/time.h"
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#include <inttypes.h>
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#include <windows.h>
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#include "base/logging.h"
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namespace crashpad {
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void GetTimeOfDay(timeval* tv) {
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FILETIME filetime;
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GetSystemTimeAsFileTime(&filetime);
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uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
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filetime.dwLowDateTime;
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t /= 10; // 100 nanosecond intervals to microseconds.
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// Windows epoch is 1601-01-01, and FILETIME ticks are 100 nanoseconds.
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// 1601 to 1970 is 369 years + 89 leap days = 134774 days * 86400 seconds per
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// day. It's not entirely clear, but it appears that these are solar seconds,
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// not SI seconds, so there are no leap seconds to be considered.
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const uint64_t kNumSecondsFrom1601To1970 = (369 * 365 + 89) * 86400ULL;
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const uint64_t kMicrosecondsPerSecond = static_cast<uint64_t>(1E6);
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DCHECK_GE(t, kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond);
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t -= kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond;
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tv->tv_sec = static_cast<long>(t / kMicrosecondsPerSecond);
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tv->tv_usec = static_cast<long>(t % kMicrosecondsPerSecond);
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}
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} // namespace crashpad
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