// 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/win/time.h" #include #include "base/logging.h" namespace crashpad { namespace { const uint64_t kMicrosecondsPerSecond = static_cast(1E6); uint64_t FiletimeToMicroseconds(const FILETIME& filetime) { uint64_t t = (static_cast(filetime.dwHighDateTime) << 32) | filetime.dwLowDateTime; return t / 10; // 100 nanosecond intervals to microseconds. } timeval MicrosecondsToTimeval(uint64_t microseconds) { timeval tv; tv.tv_sec = static_cast(microseconds / kMicrosecondsPerSecond); tv.tv_usec = static_cast(microseconds % kMicrosecondsPerSecond); return tv; } } // namespace timeval FiletimeToTimevalEpoch(const FILETIME& filetime) { uint64_t microseconds = FiletimeToMicroseconds(filetime); // 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. const uint64_t kNumSecondsFrom1601To1970 = (369 * 365 + 89) * 86400ULL; 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