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 25 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)) {} 29 ~PageHolder() { 30 if (addr != MAP_FAILED) 31 LIBC_NAMESPACE::munmap(addr, size); 32 } 33 34 char &operator[](size_t i) { return reinterpret_cast<char *>(addr)[i]; } 35 36 bool is_valid() { return addr != MAP_FAILED; } 37 }; 38 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 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 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 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