1 //===-- Unittests for msync -----------------------------------------------===//
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/mlock.h"
11 #include "src/sys/mman/mmap.h"
12 #include "src/sys/mman/msync.h"
13 #include "src/sys/mman/munlock.h"
14 #include "src/sys/mman/munmap.h"
15 #include "src/unistd/sysconf.h"
16 #include "test/UnitTest/ErrnoSetterMatcher.h"
17 #include "test/UnitTest/Test.h"
18
19 using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
20
21 struct PageHolder {
22 size_t size;
23 void *addr;
24
PageHolderPageHolder25 PageHolder()
26 : size(LIBC_NAMESPACE::sysconf(_SC_PAGESIZE)),
27 addr(LIBC_NAMESPACE::mmap(nullptr, size, PROT_READ | PROT_WRITE,
28 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0)) {}
~PageHolderPageHolder29 ~PageHolder() {
30 if (addr != MAP_FAILED)
31 LIBC_NAMESPACE::munmap(addr, size);
32 }
33
operator []PageHolder34 char &operator[](size_t i) { return reinterpret_cast<char *>(addr)[i]; }
35
is_validPageHolder36 bool is_valid() { return addr != MAP_FAILED; }
37 };
38
TEST(LlvmLibcMsyncTest,UnMappedMemory)39 TEST(LlvmLibcMsyncTest, UnMappedMemory) {
40 EXPECT_THAT(LIBC_NAMESPACE::msync(nullptr, 1024, MS_SYNC), Fails(ENOMEM));
41 EXPECT_THAT(LIBC_NAMESPACE::msync(nullptr, 1024, MS_ASYNC), Fails(ENOMEM));
42 }
43
TEST(LlvmLibcMsyncTest,LockedPage)44 TEST(LlvmLibcMsyncTest, LockedPage) {
45 PageHolder page;
46 ASSERT_TRUE(page.is_valid());
47 ASSERT_THAT(LIBC_NAMESPACE::mlock(page.addr, page.size), Succeeds());
48 EXPECT_THAT(
49 LIBC_NAMESPACE::msync(page.addr, page.size, MS_SYNC | MS_INVALIDATE),
50 Fails(EBUSY));
51 ASSERT_THAT(LIBC_NAMESPACE::munlock(page.addr, page.size), Succeeds());
52 EXPECT_THAT(LIBC_NAMESPACE::msync(page.addr, page.size, MS_SYNC), Succeeds());
53 }
54
TEST(LlvmLibcMsyncTest,UnalignedAddress)55 TEST(LlvmLibcMsyncTest, UnalignedAddress) {
56 PageHolder page;
57 ASSERT_TRUE(page.is_valid());
58 EXPECT_THAT(LIBC_NAMESPACE::msync(&page[1], page.size - 1, MS_SYNC),
59 Fails(EINVAL));
60 }
61
TEST(LlvmLibcMsyncTest,InvalidFlag)62 TEST(LlvmLibcMsyncTest, InvalidFlag) {
63 PageHolder page;
64 ASSERT_TRUE(page.is_valid());
65 EXPECT_THAT(LIBC_NAMESPACE::msync(page.addr, page.size, MS_SYNC | MS_ASYNC),
66 Fails(EINVAL));
67 EXPECT_THAT(LIBC_NAMESPACE::msync(page.addr, page.size, -1), Fails(EINVAL));
68 }
69