1 //
2 // Copyright (C) 2022 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 //! Monotonic clock implementation.
17 
18 use kmr_common::crypto;
19 
20 /// Monotonic clock.
21 #[derive(Default)]
22 pub struct StdClock;
23 
24 impl crypto::MonotonicClock for StdClock {
now(&self) -> crypto::MillisecondsSinceEpoch25     fn now(&self) -> crypto::MillisecondsSinceEpoch {
26         let mut time = libc::timespec { tv_sec: 0, tv_nsec: 0 };
27         let rc =
28         // Safety: `time` is a valid structure.
29             unsafe { libc::clock_gettime(libc::CLOCK_BOOTTIME, &mut time as *mut libc::timespec) };
30         if rc < 0 {
31             log::warn!("failed to get time!");
32             return crypto::MillisecondsSinceEpoch(0);
33         }
34         crypto::MillisecondsSinceEpoch((time.tv_sec * 1000) + (time.tv_nsec / 1000 / 1000))
35     }
36 }
37