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 "hdr/time_macros.h"
10#include "hdr/types/struct_timespec.h"
11#include "hdr/types/time_t.h"
12#include "src/__support/macros/properties/architectures.h"
13#include "src/time/clock_gettime.h"
14#include "test/UnitTest/Test.h"
15
16TEST(LlvmLibcClockGetTime, RealTime) {
17 timespec tp;
18 int result;
19 result = LIBC_NAMESPACE::clock_gettime(CLOCK_REALTIME, &tp);
20 // The GPU does not implement CLOCK_REALTIME but provides it so programs will
21 // compile.
22#ifdef LIBC_TARGET_ARCH_IS_GPU
23 ASSERT_EQ(result, -1);
24#else
25 ASSERT_EQ(result, 0);
26 ASSERT_GT(tp.tv_sec, time_t(0));
27#endif
28}
29
30#ifdef CLOCK_MONOTONIC
31TEST(LlvmLibcClockGetTime, MonotonicTime) {
32 timespec tp1, tp2;
33 int result;
34 result = LIBC_NAMESPACE::clock_gettime(CLOCK_MONOTONIC, &tp1);
35 ASSERT_EQ(result, 0);
36 ASSERT_GT(tp1.tv_sec, time_t(0));
37 result = LIBC_NAMESPACE::clock_gettime(CLOCK_MONOTONIC, &tp2);
38 ASSERT_EQ(result, 0);
39 ASSERT_GE(tp2.tv_sec, tp1.tv_sec); // The monotonic clock should increase.
40 if (tp2.tv_sec == tp1.tv_sec) {
41 ASSERT_GE(tp2.tv_nsec, tp1.tv_nsec);
42 }
43}
44#endif // CLOCK_MONOTONIC
45

source code of libc/test/src/time/clock_gettime_test.cpp