66 lines · cpp
1//===-- Unittests for mremap ----------------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sys/mman/mmap.h"10#include "src/sys/mman/mremap.h"11#include "src/sys/mman/munmap.h"12#include "test/UnitTest/ErrnoCheckingTest.h"13#include "test/UnitTest/ErrnoSetterMatcher.h"14#include "test/UnitTest/Test.h"15 16using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;17using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;18using LlvmLibcMremapTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;19 20TEST_F(LlvmLibcMremapTest, NoError) {21 size_t initial_size = 128;22 size_t new_size = 256;23 24 // Allocate memory using mmap.25 void *addr =26 LIBC_NAMESPACE::mmap(nullptr, initial_size, PROT_READ | PROT_WRITE,27 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);28 ASSERT_ERRNO_SUCCESS();29 EXPECT_NE(addr, MAP_FAILED);30 31 int *array = reinterpret_cast<int *>(addr);32 // Writing to the memory should not crash the test.33 array[0] = 123;34 EXPECT_EQ(array[0], 123);35 36 // Re-map the memory using mremap with an increased size.37 void *new_addr =38 LIBC_NAMESPACE::mremap(addr, initial_size, new_size, MREMAP_MAYMOVE);39 ASSERT_ERRNO_SUCCESS();40 EXPECT_NE(new_addr, MAP_FAILED);41 EXPECT_EQ(reinterpret_cast<int *>(new_addr)[0],42 123); // Verify data is preserved.43 44 // Clean up memory by unmapping it.45 EXPECT_THAT(LIBC_NAMESPACE::munmap(new_addr, new_size), Succeeds());46}47 48TEST_F(LlvmLibcMremapTest, Error_InvalidSize) {49 size_t initial_size = 128;50 51 // Allocate memory using mmap.52 void *addr =53 LIBC_NAMESPACE::mmap(nullptr, initial_size, PROT_READ | PROT_WRITE,54 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);55 ASSERT_ERRNO_SUCCESS();56 EXPECT_NE(addr, MAP_FAILED);57 58 // Attempt to re-map the memory with an invalid new size (0).59 void *new_addr =60 LIBC_NAMESPACE::mremap(addr, initial_size, 0, MREMAP_MAYMOVE);61 EXPECT_THAT(new_addr, Fails(EINVAL, MAP_FAILED));62 63 // Clean up the original mapping.64 EXPECT_THAT(LIBC_NAMESPACE::munmap(addr, initial_size), Succeeds());65}66