Source code
Revision control
Copy as Markdown
Other Tools
// Copyright (c) 2011, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// memory_mapped_file_unittest.cc:
// Unit tests for google_breakpad::MemoryMappedFile.
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include "breakpad_googletest_includes.h"
#include "common/linux/memory_mapped_file.h"
#include "common/tests/auto_tempdir.h"
#include "common/tests/file_utils.h"
#include "common/using_std_string.h"
using google_breakpad::AutoTempDir;
using google_breakpad::MemoryMappedFile;
using google_breakpad::WriteFile;
namespace {
class MemoryMappedFileTest : public testing::Test {
protected:
void ExpectNoMappedData(const MemoryMappedFile& mapped_file) {
EXPECT_TRUE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() == NULL);
EXPECT_EQ(0U, mapped_file.size());
}
};
} // namespace
TEST_F(MemoryMappedFileTest, DefaultConstructor) {
MemoryMappedFile mapped_file;
ExpectNoMappedData(mapped_file);
}
TEST_F(MemoryMappedFileTest, UnmapWithoutMap) {
MemoryMappedFile mapped_file;
mapped_file.Unmap();
}
TEST_F(MemoryMappedFileTest, MapNonexistentFile) {
{
MemoryMappedFile mapped_file("nonexistent-file", 0);
ExpectNoMappedData(mapped_file);
}
{
MemoryMappedFile mapped_file;
EXPECT_FALSE(mapped_file.Map("nonexistent-file", 0));
ExpectNoMappedData(mapped_file);
}
}
TEST_F(MemoryMappedFileTest, MapEmptyFile) {
AutoTempDir temp_dir;
string test_file = temp_dir.path() + "/empty_file";
ASSERT_TRUE(WriteFile(test_file.c_str(), NULL, 0));
{
MemoryMappedFile mapped_file(test_file.c_str(), 0);
ExpectNoMappedData(mapped_file);
}
{
MemoryMappedFile mapped_file;
EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
ExpectNoMappedData(mapped_file);
}
}
TEST_F(MemoryMappedFileTest, MapNonEmptyFile) {
char data[256];
size_t data_size = sizeof(data);
for (size_t i = 0; i < data_size; ++i) {
data[i] = i;
}
AutoTempDir temp_dir;
string test_file = temp_dir.path() + "/test_file";
ASSERT_TRUE(WriteFile(test_file.c_str(), data, data_size));
{
MemoryMappedFile mapped_file(test_file.c_str(), 0);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
}
{
MemoryMappedFile mapped_file;
EXPECT_TRUE(mapped_file.Map(test_file.c_str(), 0));
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data, mapped_file.data(), data_size));
}
}
TEST_F(MemoryMappedFileTest, RemapAfterMap) {
char data1[256];
size_t data1_size = sizeof(data1);
for (size_t i = 0; i < data1_size; ++i) {
data1[i] = i;
}
char data2[50];
size_t data2_size = sizeof(data2);
for (size_t i = 0; i < data2_size; ++i) {
data2[i] = 255 - i;
}
AutoTempDir temp_dir;
string test_file1 = temp_dir.path() + "/test_file1";
string test_file2 = temp_dir.path() + "/test_file2";
ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
ASSERT_TRUE(WriteFile(test_file2.c_str(), data2, data2_size));
{
MemoryMappedFile mapped_file(test_file1.c_str(), 0);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data1_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
mapped_file.Map(test_file2.c_str(), 0);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data2_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
}
{
MemoryMappedFile mapped_file;
EXPECT_TRUE(mapped_file.Map(test_file1.c_str(), 0));
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data1_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data1, mapped_file.data(), data1_size));
mapped_file.Map(test_file2.c_str(), 0);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data2_size, mapped_file.size());
EXPECT_EQ(0, memcmp(data2, mapped_file.data(), data2_size));
}
}
TEST_F(MemoryMappedFileTest, MapWithOffset) {
// Put more data in the test file this time. Offsets can only be
// done on page boundaries, so we need a two page file to test this.
const int page_size = 4096;
char data1[2 * page_size];
size_t data1_size = sizeof(data1);
for (size_t i = 0; i < data1_size; ++i) {
data1[i] = i & 0x7f;
}
AutoTempDir temp_dir;
string test_file1 = temp_dir.path() + "/test_file1";
ASSERT_TRUE(WriteFile(test_file1.c_str(), data1, data1_size));
{
MemoryMappedFile mapped_file(test_file1.c_str(), page_size);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data1_size - page_size, mapped_file.size());
EXPECT_EQ(
0,
memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
}
{
MemoryMappedFile mapped_file;
mapped_file.Map(test_file1.c_str(), page_size);
EXPECT_FALSE(mapped_file.content().IsEmpty());
EXPECT_TRUE(mapped_file.data() != NULL);
EXPECT_EQ(data1_size - page_size, mapped_file.size());
EXPECT_EQ(
0,
memcmp(data1 + page_size, mapped_file.data(), data1_size - page_size));
}
}