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//===-- Unittests for mremap ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/sys/mman/mmap.h"
#include "src/sys/mman/mremap.h"
#include "src/sys/mman/munmap.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
using LlvmLibcMremapTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
TEST_F(LlvmLibcMremapTest, NoError) {
size_t initial_size = 128;
size_t new_size = 256;
// Allocate memory using mmap.
void *addr =
LIBC_NAMESPACE::mmap(nullptr, initial_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_ERRNO_SUCCESS();
EXPECT_NE(addr, MAP_FAILED);
int *array = reinterpret_cast<int *>(addr);
// Writing to the memory should not crash the test.
array[0] = 123;
EXPECT_EQ(array[0], 123);
// Re-map the memory using mremap with an increased size.
void *new_addr =
LIBC_NAMESPACE::mremap(addr, initial_size, new_size, MREMAP_MAYMOVE);
ASSERT_ERRNO_SUCCESS();
EXPECT_NE(new_addr, MAP_FAILED);
EXPECT_EQ(reinterpret_cast<int *>(new_addr)[0],
123); // Verify data is preserved.
// Clean up memory by unmapping it.
EXPECT_THAT(LIBC_NAMESPACE::munmap(new_addr, new_size), Succeeds());
}
TEST_F(LlvmLibcMremapTest, Error_InvalidSize) {
size_t initial_size = 128;
// Allocate memory using mmap.
void *addr =
LIBC_NAMESPACE::mmap(nullptr, initial_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_ERRNO_SUCCESS();
EXPECT_NE(addr, MAP_FAILED);
// Attempt to re-map the memory with an invalid new size (0).
void *new_addr =
LIBC_NAMESPACE::mremap(addr, initial_size, 0, MREMAP_MAYMOVE);
EXPECT_THAT(new_addr, Fails(EINVAL, MAP_FAILED));
// Clean up the original mapping.
EXPECT_THAT(LIBC_NAMESPACE::munmap(addr, initial_size), Succeeds());
}
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