(PECL eio >= 0.0.1dev)
eio_fdatasync — Synchronize a file's in-core state with storage device
$pri= EIO_PRI_DEFAULT [, callable
$callback= NULL [, mixed
$data= NULL ]]] ) : resource
eio_fdatasync() synchronizes a file's in-core state with storage device.
Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open().
The request priority:
pri internally is set to
callback function is called when the request is done.
It should match the following prototype: