eio_sync_file_range

(PECL eio >= 0.0.1dev)

eio_sync_file_rangeSync a file segment with disk

說明

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.

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 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

請求的優先順序:EIO_PRI_DEFAULTEIO_PRI_MINEIO_PRI_MAXNULL。如果是 NULLpri 將設為 EIO_PRI_DEFAULT

callback

callback 函式在請求完成時被呼叫。其應匹配以下原型:

void callback(mixed $data, int $result[, resource $req]);
data

傳遞給請求的用戶資料。

result

針對請求的結果值。通常是對應的系統較回傳值。

req

可選擇的請求資源,可被 eio_get_last_error() 之類的函式使用。

data

Arbitrary variable passed to callback.

回傳值

eio_sync_file_range() returns request resource on success or FALSE on error.

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