1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 #include "chre/platform/system_time.h" 18 19 #include <cerrno> 20 #include <cstring> 21 #include <ctime> 22 23 #include "chre/platform/assert.h" 24 #include "chre/platform/log.h" 25 26 namespace chre { 27 28 Nanoseconds SystemTime::getMonotonicTime() { 29 struct timespec timeNow; 30 if (clock_gettime(CLOCK_MONOTONIC, &timeNow)) { 31 CHRE_ASSERT_LOG(false, "Failed to obtain time with error: %s", 32 strerror(errno)); 33 return Nanoseconds(UINT64_MAX); 34 } 35 36 // The C++11 spec guarantees that tv_sec and tv_nsec only have values >= 0 and 37 // [0, 999999999]. It is safe to static cast these to their unsigned 38 // counterpart. 39 return Seconds(static_cast<uint64_t>(timeNow.tv_sec)) 40 + Nanoseconds(static_cast<uint64_t>(timeNow.tv_nsec)); 41 } 42 43 int64_t SystemTime::getEstimatedHostTimeOffset() { 44 return 0; 45 } 46 47 } // namespace chre 48
