1//===-- Unittests for posix_madvise ---------------------------------------===//
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/sys/mman/mmap.h"
10#include "src/sys/mman/munmap.h"
11#include "src/sys/mman/posix_madvise.h"
12#include "test/UnitTest/ErrnoCheckingTest.h"
13#include "test/UnitTest/ErrnoSetterMatcher.h"
14#include "test/UnitTest/Test.h"
15
16#include <sys/mman.h>
17
18using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
19using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
20using LlvmLibcPosixMadviseTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
21
22TEST_F(LlvmLibcPosixMadviseTest, NoError) {
23 size_t alloc_size = 128;
24 void *addr = LIBC_NAMESPACE::mmap(nullptr, alloc_size, PROT_READ,
25 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
26 ASSERT_ERRNO_SUCCESS();
27 EXPECT_NE(addr, MAP_FAILED);
28
29 EXPECT_EQ(LIBC_NAMESPACE::posix_madvise(addr, alloc_size, POSIX_MADV_RANDOM),
30 0);
31
32 int *array = reinterpret_cast<int *>(addr);
33 // Reading from the memory should not crash the test.
34 // Since we used the MAP_ANONYMOUS flag, the contents of the newly
35 // allocated memory should be initialized to zero.
36 EXPECT_EQ(array[0], 0);
37 EXPECT_THAT(LIBC_NAMESPACE::munmap(addr, alloc_size), Succeeds());
38}
39
40TEST_F(LlvmLibcPosixMadviseTest, Error_BadPtr) {
41 // posix_madvise is a no-op on DONTNEED, so it shouldn't fail even with the
42 // nullptr.
43 EXPECT_EQ(LIBC_NAMESPACE::posix_madvise(nullptr, 8, POSIX_MADV_DONTNEED), 0);
44
45 // posix_madvise doesn't set errno, but the return value is actually the error
46 // code.
47 EXPECT_EQ(LIBC_NAMESPACE::posix_madvise(nullptr, 8, POSIX_MADV_SEQUENTIAL),
48 ENOMEM);
49}
50

source code of libc/test/src/sys/mman/linux/posix_madvise_test.cpp