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 "include/errno.h"
10 #include "include/sys/mman.h"
11 #include "src/errno/llvmlibc_errno.h"
12 #include "src/sys/mman/mmap.h"
13 #include "src/sys/mman/munmap.h"
14 #include "test/ErrnoSetterMatcher.h"
15 #include "utils/UnitTest/Test.h"
16 
17 using __llvm_libc::testing::ErrnoSetterMatcher::Fails;
18 using __llvm_libc::testing::ErrnoSetterMatcher::Succeeds;
19 
20 TEST(LlvmLibcMMapTest, NoError) {
21   size_t alloc_size = 128;
22   llvmlibc_errno = 0;
23   void *addr = __llvm_libc::mmap(nullptr, alloc_size, PROT_READ,
24                                  MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
25   EXPECT_EQ(0, llvmlibc_errno);
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(__llvm_libc::munmap(addr, alloc_size), Succeeds());
34 }
35 
36 TEST(LlvmLibcMMapTest, Error_InvalidSize) {
37   llvmlibc_errno = 0;
38   void *addr = __llvm_libc::mmap(nullptr, 0, PROT_READ,
39                                  MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
40   EXPECT_THAT(addr, Fails(EINVAL, MAP_FAILED));
41 
42   EXPECT_THAT(__llvm_libc::munmap(0, 0), Fails(EINVAL));
43 }
44