Class StringDataInChildProcess

util/process/process_memory_test.cc:453–486

constexpr size_t kChildProcessStringLength = 10;

class StringDataInChildProcess {
 public:
  // This constructor only makes sense in the child process.
  explicit StringDataInChildProcess(const char* cstring, bool valid)
      : address_(FromPointerCast<VMAddress>(cstring)) {
    if (valid) {
      memcpy(expected_value_, cstring, kChildProcessStringLength + 1);
    } else {
      memset(expected_value_, 0xff, kChildProcessStringLength + 1);
    }
  }

  void Write(FileHandle out) {
    CheckedWriteFile(out, &address_, sizeof(address_));
    CheckedWriteFile(out, &expected_value_, sizeof(expected_value_));
  }

  static StringDataInChildProcess Read(FileHandle in) {
    StringDataInChildProcess str;
    EXPECT_TRUE(ReadFileExactly(in, &str.address_, sizeof(str.address_)));
    EXPECT_TRUE(
        ReadFileExactly(in, &str.expected_value_, sizeof(str.expected_value_)));
    return str;
  }

  VMAddress address() const { return address_; }
  std::string expected_value() const { return expected_value_; }

  private:
   StringDataInChildProcess() : address_(0), expected_value_() {}

   VMAddress address_;
   char expected_value_[kChildProcessStringLength + 1];
};

void DoCStringUnmappedTestSetup(
    void* page,