233   unique_fd fd(  in PrepareFile()  local
235   ASSERT_NE(fd.get(), -1);  in PrepareFile()
239     write(fd.get(), buffer, sizeof(buffer));  in PrepareFile()
276     unique_fd fd;  in FindChanged()  local
278       fd = unique_fd(open(loop_device_.c_str(), O_RDONLY));  in FindChanged()
280       fd = unique_fd(open(bow_device_.c_str(), O_RDONLY));  in FindChanged()
281     EXPECT_NE(fd.get(), -1);  in FindChanged()
282     if (fd.get() == -1) return;  in FindChanged()
297       EXPECT_NE(lseek(fd.get(), i * sector_size_, SEEK_SET), -1);  in FindChanged()
298       EXPECT_EQ(read(fd.get(), buffer, sizeof(buffer)), sizeof(buffer));  in FindChanged()
452   unique_fd fd(open(MOUNT_POINT, O_RDONLY));  in Trim()  local
453   EXPECT_NE(fd.get(), -1);  in Trim()
456   EXPECT_EQ(ioctl(fd, FITRIM, &range), 0);  in Trim()