eio_sync_file_range Sync a file segment with disk &reftitle.description; resourceeio_sync_file_range mixedfd intoffset intnbytes intflags intpriEIO_PRI_DEFAULT callablecallbackNULL mixeddataNULL eio_sync_file_range permits fine control when synchronizing the open file referred to by the file descriptor fd with disk. &reftitle.parameters; fd File descriptor offset The starting byte of the file range to be synchronized nbytes Specifies the length of the range to be synchronized, in bytes. If nbytes is zero, then all bytes from offset through to the end of file are synchronized. flags A bit-mask. Can include any of the following values: EIO_SYNC_FILE_RANGE_WAIT_BEFORE, EIO_SYNC_FILE_RANGE_WRITE, EIO_SYNC_FILE_RANGE_WAIT_AFTER. These flags have the same meaning as their SYNC_FILE_RANGE_* counterparts(see SYNC_FILE_RANGE(2) man page). pri &eio.request.pri.values; callback &eio.callback.proto; data Arbitrary variable passed to callback. &reftitle.returnvalues; eio_sync_file_range returns request resource on success,&return.falseforfailure;.