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- // Copyright 2015 The Crashpad Authors. All rights reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
- #include "util/misc/time.h"
- #include <stdint.h>
- #include "base/logging.h"
- namespace crashpad {
- namespace {
- constexpr uint64_t kMicrosecondsPerSecond = static_cast<uint64_t>(1E6);
- constexpr uint64_t kNanosecondsPerFiletimeInterval = static_cast<uint64_t>(100);
- constexpr uint64_t kFiletimeIntervalsPerSecond =
- kNanosecondsPerSecond / kNanosecondsPerFiletimeInterval;
- constexpr uint64_t kFiletimeIntervalsPerMicrosecond =
- kFiletimeIntervalsPerSecond / kMicrosecondsPerSecond;
- // Windows epoch is 1601-01-01, and FILETIME ticks are 100 nanoseconds.
- // 1601 to 1970 is 369 years + 89 leap days = 134774 days * 86400 seconds per
- // day. It's not entirely clear, but it appears that these are solar seconds,
- // not SI seconds, so there are no leap seconds to be considered.
- constexpr uint64_t kNumSecondsFrom1601To1970 = (369 * 365 + 89) * 86400ULL;
- uint64_t FiletimeToMicroseconds(const FILETIME& filetime) {
- uint64_t t = (static_cast<uint64_t>(filetime.dwHighDateTime) << 32) |
- filetime.dwLowDateTime;
- return t / kFiletimeIntervalsPerMicrosecond;
- }
- timeval MicrosecondsToTimeval(uint64_t microseconds) {
- timeval tv;
- tv.tv_sec = static_cast<long>(microseconds / kMicrosecondsPerSecond);
- tv.tv_usec = static_cast<long>(microseconds % kMicrosecondsPerSecond);
- return tv;
- }
- } // namespace
- FILETIME TimespecToFiletimeEpoch(const timespec& ts) {
- uint64_t intervals =
- (kNumSecondsFrom1601To1970 + ts.tv_sec) * kFiletimeIntervalsPerSecond +
- ts.tv_nsec / kNanosecondsPerFiletimeInterval;
- FILETIME filetime;
- filetime.dwLowDateTime = intervals & 0xffffffff;
- filetime.dwHighDateTime = intervals >> 32;
- return filetime;
- }
- timespec FiletimeToTimespecEpoch(const FILETIME& filetime) {
- uint64_t intervals =
- (uint64_t{filetime.dwHighDateTime} << 32) | filetime.dwLowDateTime;
- timespec result;
- result.tv_sec =
- (intervals / kFiletimeIntervalsPerSecond) - kNumSecondsFrom1601To1970;
- result.tv_nsec =
- static_cast<long>(intervals % kFiletimeIntervalsPerSecond) *
- kNanosecondsPerFiletimeInterval;
- return result;
- }
- timeval FiletimeToTimevalEpoch(const FILETIME& filetime) {
- uint64_t microseconds = FiletimeToMicroseconds(filetime);
- DCHECK_GE(microseconds, kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond);
- microseconds -= kNumSecondsFrom1601To1970 * kMicrosecondsPerSecond;
- return MicrosecondsToTimeval(microseconds);
- }
- timeval FiletimeToTimevalInterval(const FILETIME& filetime) {
- return MicrosecondsToTimeval(FiletimeToMicroseconds(filetime));
- }
- void GetTimeOfDay(timeval* tv) {
- FILETIME filetime;
- GetSystemTimeAsFileTime(&filetime);
- *tv = FiletimeToTimevalEpoch(filetime);
- }
- } // namespace crashpad
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