202     auto chunk{::read(fd_, buffer + got, maxBytes - got)};  in Read()  local
203     if (chunk == 0) {  in Read()
205     } else if (chunk < 0) {  in Read()
212       SetPosition(position_ + chunk);  in Read()
213       got += chunk;  in Read()
230     auto chunk{::write(fd_, buffer + put, bytes - put)};  in Write()  local
231     if (chunk >= 0) {  in Write()
232       SetPosition(position_ + chunk);  in Write()
233       put += chunk;  in Write()
275     auto chunk{::pread(fd_, buffer + got, bytes - got, at)};  in ReadAsynchronously()  local
277     auto chunk{Seek(at, handler) ? ::read(fd_, buffer + got, bytes - got) : -1};  in ReadAsynchronously()
279     if (chunk == 0) {  in ReadAsynchronously()
283     if (chunk < 0) {  in ReadAsynchronously()
290       at += chunk;  in ReadAsynchronously()
291       got += chunk;  in ReadAsynchronously()
304     auto chunk{::pwrite(fd_, buffer + put, bytes - put, at)};  in WriteAsynchronously()  local
306     auto chunk{  in WriteAsynchronously()
309     if (chunk >= 0) {  in WriteAsynchronously()
310       at += chunk;  in WriteAsynchronously()
311       put += chunk;  in WriteAsynchronously()