eio_sync_file_range
(PECL eio >= 0.0.1dev)
eio_sync_file_range — Sync a file segment with disk
說明
mixed
$fd,int
$offset,int
$nbytes,int
$flags,int
$pri = EIO_PRI_DEFAULT,callable
$callback = NULL,mixed
$data = NULL): resource
eio_sync_file_range() permits fine control when synchronizing the open file referred to by the file
descriptor fd with disk.
參數
-
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
nbytesis zero, then all bytes fromoffsetthrough 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(seeSYNC_FILE_RANGE(2)man page). -
pri -
請求的優先順序：
EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX或null。如果是null，pri將設為EIO_PRI_DEFAULT。 -
callback -
callback函式在請求完成時被呼叫。其應匹配一下原型：void callback(mixed $data, int $result[, resource $req]);-
data -
傳遞給請求的用戶數據。
-
result -
針對請求的結果的值。通常是相應的系統呼叫返回的值。
-
req -
可選的請求資源，可被 eio_get_last_error() 之類的函式使用。
-
-
data -
Arbitrary variable passed to
callback.
返回值
eio_sync_file_range() returns request resource on success, 或者在失敗時返回 false.