roughtime.googlesource.com/roughtime.git@v0.0.0-20201210012726-dd529367052d/sys_time.h (about)

     1  /* Copyright 2016 The Roughtime Authors.
     2   *
     3   * Licensed under the Apache License, Version 2.0 (the "License");
     4   * you may not use this file except in compliance with the License.
     5   * You may obtain a copy of the License at
     6   *
     7   *   http://www.apache.org/licenses/LICENSE-2.0
     8   *
     9   * Unless required by applicable law or agreed to in writing, software
    10   * distributed under the License is distributed on an "AS IS" BASIS,
    11   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12   * See the License for the specific language governing permissions and
    13   * limitations under the License. */
    14  
    15  #ifndef SECURITY_ROUGHTIME_SYS_TIME_H_
    16  #define SECURITY_ROUGHTIME_SYS_TIME_H_
    17  
    18  #include <stdint.h>
    19  
    20  #include "time_source.h"
    21  
    22  namespace roughtime {
    23  
    24  // SystemTimeSource uses gettimeofday to provide the current time and has a
    25  // fixed uncertainly of one second. Roughtime defines time to include smeared
    26  // leap seconds but it's unlikely that the system clock respects that. Thus
    27  // the radius is meant to reflect that and this time source is only provided as
    28  // an example.
    29  class SystemTimeSource : public TimeSource {
    30   public:
    31    SystemTimeSource();
    32    ~SystemTimeSource() override;
    33  
    34    std::pair<uint64_t, uint32_t> Now() override;
    35  };
    36  
    37  }  // namespace roughtime
    38  
    39  #endif  // SECURITY_ROUGHTIME_SYS_TIME_H_