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 
getMonotonicTime()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 
getEstimatedHostTimeOffset()43 int64_t SystemTime::getEstimatedHostTimeOffset() {
44   return 0;
45 }
46 
47 }  // namespace chre
48