1//===-- Unittests for mmap and munmap -------------------------------------===//
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/errno/libc_errno.h"
10#include "src/sys/mman/mmap.h"
11#include "src/sys/mman/munmap.h"
12#include "test/UnitTest/ErrnoSetterMatcher.h"
13#include "test/UnitTest/Test.h"
14
15#include <sys/mman.h>
16
17using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
18using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
19
20TEST(LlvmLibcMMapTest, NoError) {
21 size_t alloc_size = 128;
22 LIBC_NAMESPACE::libc_errno = 0;
23 void *addr = LIBC_NAMESPACE::mmap(addr: nullptr, size: alloc_size, PROT_READ,
24 MAP_ANONYMOUS | MAP_PRIVATE, fd: -1, offset: 0);
25 ASSERT_ERRNO_SUCCESS();
26 EXPECT_NE(addr, MAP_FAILED);
27
28 int *array = reinterpret_cast<int *>(addr);
29 // Reading from the memory should not crash the test.
30 // Since we used the MAP_ANONYMOUS flag, the contents of the newly
31 // allocated memory should be initialized to zero.
32 EXPECT_EQ(array[0], 0);
33 EXPECT_THAT(LIBC_NAMESPACE::munmap(addr, alloc_size), Succeeds());
34}
35
36TEST(LlvmLibcMMapTest, Error_InvalidSize) {
37 LIBC_NAMESPACE::libc_errno = 0;
38 void *addr = LIBC_NAMESPACE::mmap(addr: nullptr, size: 0, PROT_READ,
39 MAP_ANONYMOUS | MAP_PRIVATE, fd: -1, offset: 0);
40 EXPECT_THAT(addr, Fails(EINVAL, MAP_FAILED));
41
42 EXPECT_THAT(LIBC_NAMESPACE::munmap(0, 0), Fails(EINVAL));
43}
44

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