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29
30 // memory_mapped_file_unittest.cc:
31 // Unit tests for google_breakpad::MemoryMappedFile.
32
33 #include <fcntl.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 #include <string>
38
39 #include "breakpad_googletest_includes.h"
40 #include "common/linux/memory_mapped_file.h"
41 #include "common/tests/auto_tempdir.h"
42 #include "common/tests/file_utils.h"
43 #include "common/using_std_string.h"
44
45 using google_breakpad::AutoTempDir;
46 using google_breakpad::MemoryMappedFile;
47 using google_breakpad::WriteFile;
48
49 namespace {
50
51 class MemoryMappedFileTest : public testing::Test {
52 protected:
ExpectNoMappedData(const MemoryMappedFile & mapped_file)53 void ExpectNoMappedData(const MemoryMappedFile& mapped_file) {
54 EXPECT_TRUE(mapped_file.content().IsEmpty());
55 EXPECT_TRUE(mapped_file.data() == NULL);
56 EXPECT_EQ(0U, mapped_file.size());
57 }
58 };
59
60 } // namespace
61
TEST_F(MemoryMappedFileTest,DefaultConstructor)62 TEST_F(MemoryMappedFileTest, DefaultConstructor) {
63 MemoryMappedFile mapped_file;
64 ExpectNoMappedData(mapped_file);
65 }
66
TEST_F(MemoryMappedFileTest,UnmapWithoutMap)67 TEST_F(MemoryMappedFileTest, UnmapWithoutMap) {
68 MemoryMappedFile mapped_file;
69 mapped_file.Unmap();
70 }
71
TEST_F(MemoryMappedFileTest,MapNonexistentFile)72 TEST_F(MemoryMappedFileTest, MapNonexistentFile) {
73 {
74 MemoryMappedFile mapped_file("nonexistent-file", 0);
75 ExpectNoMappedData(mapped_file);
76 }
77 {
78 MemoryMappedFile mapped_file;
79 EXPECT_FALSE(mapped_file.Map("nonexistent-file", 0));
80 ExpectNoMappedData(mapped_file);
81 }
82 }
83
TEST_F(MemoryMappedFileTest,MapEmptyFile)84 TEST_F(MemoryMappedFileTest, MapEmptyFile) {
85 AutoTempDir temp_dir;
86 string test_file = temp_dir.path() + "/empty_file";
87 ASSERT_TRUE(WriteFile(test_file.c_str(), NULL, 0));
88
89 {
90 MemoryMappedFile mapped_file(test_file.c_str(), 0);
91 ExpectNoMappedData(mapped_file);
92 }
93 {
94 MemoryMappedFile mapped_file;
95 EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
96 ExpectNoMappedData(mapped_file);
97 }
98 }
99
TEST_F(MemoryMappedFileTest,MapNonEmptyFile)100 TEST_F(MemoryMappedFileTest, MapNonEmptyFile) {
101 char data[256];
102 size_t data_size = sizeof(data);
103 for (size_t i = 0; i < data_size; ++i) {
104 data[i] = i;
105 }
106
107 AutoTempDir temp_dir;
108 string test_file = temp_dir.path() + "/test_file";
109 ASSERT_TRUE(WriteFile(test_file.c_str(), data, data_size));
110
111 {
112 MemoryMappedFile mapped_file(test_file.c_str(), 0);
113 EXPECT_FALSE(mapped_file.content().IsEmpty());
114 EXPECT_TRUE(mapped_file.data() != NULL);
115 EXPECT_EQ(data_size, mapped_file.size());
116 EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
117 }
118 {
119 MemoryMappedFile mapped_file;
120 EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
121 EXPECT_FALSE(mapped_file.content().IsEmpty());
122 EXPECT_TRUE(mapped_file.data() != NULL);
123 EXPECT_EQ(data_size, mapped_file.size());
124 EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
125 }
126 }
127
TEST_F(MemoryMappedFileTest,RemapAfterMap)128 TEST_F(MemoryMappedFileTest, RemapAfterMap) {
129 char data1[256];
130 size_t data1_size = sizeof(data1);
131 for (size_t i = 0; i < data1_size; ++i) {
132 data1[i] = i;
133 }
134
135 char data2[50];
136 size_t data2_size = sizeof(data2);
137 for (size_t i = 0; i < data2_size; ++i) {
138 data2[i] = 255 - i;
139 }
140
141 AutoTempDir temp_dir;
142 string test_file1 = temp_dir.path() + "/test_file1";
143 string test_file2 = temp_dir.path() + "/test_file2";
144 ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
145 ASSERT_TRUE(WriteFile(test_file2.c_str(), data2, data2_size));
146
147 {
148 MemoryMappedFile mapped_file(test_file1.c_str(), 0);
149 EXPECT_FALSE(mapped_file.content().IsEmpty());
150 EXPECT_TRUE(mapped_file.data() != NULL);
151 EXPECT_EQ(data1_size, mapped_file.size());
152 EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
153
154 mapped_file.Map(test_file2.c_str(), 0);
155 EXPECT_FALSE(mapped_file.content().IsEmpty());
156 EXPECT_TRUE(mapped_file.data() != NULL);
157 EXPECT_EQ(data2_size, mapped_file.size());
158 EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
159 }
160 {
161 MemoryMappedFile mapped_file;
162 EXPECT_TRUE(mapped_file.Map(test_file1.c_str(), 0));
163 EXPECT_FALSE(mapped_file.content().IsEmpty());
164 EXPECT_TRUE(mapped_file.data() != NULL);
165 EXPECT_EQ(data1_size, mapped_file.size());
166 EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
167
168 mapped_file.Map(test_file2.c_str(), 0);
169 EXPECT_FALSE(mapped_file.content().IsEmpty());
170 EXPECT_TRUE(mapped_file.data() != NULL);
171 EXPECT_EQ(data2_size, mapped_file.size());
172 EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
173 }
174 }
175
TEST_F(MemoryMappedFileTest,MapWithOffset)176 TEST_F(MemoryMappedFileTest, MapWithOffset) {
177 // Put more data in the test file this time. Offsets can only be
178 // done on page boundaries, so we need a two page file to test this.
179 const int page_size = 4096;
180 char data1[2 * page_size];
181 size_t data1_size = sizeof(data1);
182 for (size_t i = 0; i < data1_size; ++i) {
183 data1[i] = i & 0x7f;
184 }
185
186 AutoTempDir temp_dir;
187 string test_file1 = temp_dir.path() + "/test_file1";
188 ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
189 {
190 MemoryMappedFile mapped_file(test_file1.c_str(), page_size);
191 EXPECT_FALSE(mapped_file.content().IsEmpty());
192 EXPECT_TRUE(mapped_file.data() != NULL);
193 EXPECT_EQ(data1_size - page_size, mapped_file.size());
194 EXPECT_EQ(
195 0,
196 memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
197 }
198 {
199 MemoryMappedFile mapped_file;
200 mapped_file.Map(test_file1.c_str(), page_size);
201 EXPECT_FALSE(mapped_file.content().IsEmpty());
202 EXPECT_TRUE(mapped_file.data() != NULL);
203 EXPECT_EQ(data1_size - page_size, mapped_file.size());
204 EXPECT_EQ(
205 0,
206 memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
207 }
208 }
209