34   DCHECK_EQ(kPageSize, static_cast<decltype(kPageSize)>(PAGE_SIZE));  in TEST()
37   void* map = mmap(nullptr, kPageSize * 4, PROT_READ | PROT_WRITE,  in TEST()
41   char* page2 = page1 + kPageSize;  in TEST()
42   char* page3 = page2 + kPageSize;  in TEST()
43   char* page4 = page3 + kPageSize;  in TEST()
44   ASSERT_EQ(0, mprotect(page1 + kPageSize, kPageSize, PROT_NONE));  in TEST()
45   ASSERT_EQ(0, munmap(page4, kPageSize));  in TEST()
48   page1[kPageSize - 1] = 'z';  in TEST()
51   page3[kPageSize - 1] = 'y';  in TEST()
53   char buf[kPageSize];  in TEST()
57   EXPECT_EQ(static_cast<ssize_t>(kPageSize), SafeCopy(buf, page1, kPageSize)) << strerror(errno);  in TEST()
58   EXPECT_EQ(0, memcmp(buf, page1, kPageSize));  in TEST()
62   EXPECT_EQ(static_cast<ssize_t>(kPageSize - 1), SafeCopy(buf, page1 + 1, kPageSize));  in TEST()
63   EXPECT_EQ(0, memcmp(buf, page1 + 1, kPageSize - 1));  in TEST()
67   EXPECT_EQ(0, SafeCopy(buf, page2 + kPageSize - 1, kPageSize));  in TEST()
71   EXPECT_EQ(static_cast<ssize_t>(kPageSize), SafeCopy(buf, page3, kPageSize * 2));  in TEST()
72   EXPECT_EQ(0, memcmp(buf, page3, kPageSize));  in TEST()
75   EXPECT_EQ(0, SafeCopy(buf, page1 + kPageSize, kPageSize));  in TEST()
78   ASSERT_EQ(0, munmap(map, kPageSize * 3));  in TEST()
82   DCHECK_EQ(kPageSize, static_cast<decltype(kPageSize)>(PAGE_SIZE));  in TEST()
85   void* src_map = mmap(nullptr, kPageSize * 3, PROT_READ | PROT_WRITE,  in TEST()
90   void* dst_map = mmap(nullptr, kPageSize * 4, PROT_READ | PROT_WRITE,  in TEST()
96   ASSERT_EQ(0, mprotect(dst + 3 * kPageSize, kPageSize, PROT_NONE));  in TEST()
99   src[kPageSize * 3 - 512 - 1] = 'z';  in TEST()
101   EXPECT_EQ(static_cast<ssize_t>(kPageSize * 3 - 1024),  in TEST()
102             SafeCopy(dst + 1024, src + 512, kPageSize * 3 - 1024));  in TEST()
103   EXPECT_EQ(0, memcmp(dst + 1024, src + 512, kPageSize * 3 - 1024));  in TEST()
105   ASSERT_EQ(0, munmap(src_map, kPageSize * 3));  in TEST()
106   ASSERT_EQ(0, munmap(dst_map, kPageSize * 4));  in TEST()