eio_sync_file_range
(PECL eio >= 0.0.1dev)
eio_sync_file_range — Sync a file segment with disk
Description
resource eio_sync_file_range ( mixed $fd , int $offset , int $nbytes , int $flags [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]] ) eio_sync_file_range() permits fine control when synchronizing the open file referred to by the file descriptor fd with disk.
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
The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, pri internally is set to EIO_PRI_DEFAULT.
callback
callback function is called when the request is done. It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]); data
is custom data passed to the request.
result
request-specific result value; basically, the value returned by corresponding system call.
req
is optional request resource which can be used with functions like eio_get_last_error()
`data` Arbitrary variable passed to callback.
Return Values
eio_sync_file_range() returns request resource on success or FALSE on error.
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