libc/test/src/time/clock_gettime_test.cpp

   1 //===-- Unittests for clock_gettime ---------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/time/clock_gettime.h"
  10 #include "test/UnitTest/Test.h"
  11
  12 #include <time.h>
  13
  14 TEST(LlvmLibcClockGetTime, RealTime) {
  15   struct timespec tp;
  16   int result;
  17   result = clock_gettime(CLOCK_REALTIME, &tp);
  18   ASSERT_EQ(result, 0);
  19   ASSERT_GT(tp.tv_sec, time_t(0));
  20 }
  21
  22 #ifdef CLOCK_MONOTONIC
  23 TEST(LlvmLibcClockGetTime, MonotonicTime) {
  24   struct timespec tp1, tp2;
  25   int result;
  26   result = clock_gettime(CLOCK_MONOTONIC, &tp1);
  27   ASSERT_EQ(result, 0);
  28   ASSERT_GT(tp1.tv_sec, time_t(0));
  29   result = clock_gettime(CLOCK_MONOTONIC, &tp2);
  30   ASSERT_EQ(result, 0);
  31   ASSERT_GE(tp2.tv_sec, tp1.tv_sec); // The monotonic clock should increase.
  32   if (tp2.tv_sec == tp1.tv_sec) {
  33     ASSERT_GE(tp2.tv_nsec, tp1.tv_nsec);
  34   }
  35 }
  36 #endif // CLOCK_MONOTONIC