39   if (fd_ < 0) {  in Read()
43   ssize_t rc = TEMP_FAILURE_RETRY(read(fd_, buf, count));  in Read()
51   if (fd_ < 0) {  in Write()
55   ssize_t rc = TEMP_FAILURE_RETRY(write(fd_, buf, count));  in Write()
63   if (fd_ < 0) {  in Seek()
72   off_t newpos = lseek(fd_, pos, SEEK_SET);  in Seek()
83   if (fd_ < 0) {  in Close()
87   bool success = close(fd_) == 0;  in Close()
90   fd_ = -1;  in Close()
96   if (fstat(fd_, &stbuf) == -1)  in GetSize()
104     return ioctl(fd_, BLKGETSIZE64, size);  in GetSize()
107     if (ioctl(fd_, DKIOCGETBLOCKCOUNT, &sectors) == 0) {  in GetSize()
114     off_t pos = lseek(fd_, 0, SEEK_CUR);  in GetSize()
117     off_t end_pos = lseek(fd_, 0, SEEK_END);  in GetSize()
121     lseek(fd_, 0, SEEK_END);  in GetSize()
129     : fd_(fd) {}  in File()