virtual int sync()
If a put area exists (e.g. the file was opened for writing), calls Template:rlpf to write all pending output to the file.
If a get area exists (e.g. the file was opened for reading), the effect is implementation-defined. Typical implementation may empty out the get area and move the current file position back by the corresponding number of bytes.
0 in case of success, -1 in case of failure.
|This section is incomplete|
Reason: no example