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eio_sync_file_range

(PECL eio >= 0.0.1dev)

eio_sync_file_range — Sync a file segment with disk

說(shuō)明

eio_sync_file_range(
    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 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(yōu)先級：EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX 或 null。如果是 null，pri 將設為 EIO_PRI_DEFAULT。

callback

callback 函數在請求完成時(shí)被調用。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(hù)數據。

result

針對請求的結果的值。通常是相應的系統調用返回的值。

req

可選的請求資源，可被 eio_get_last_error() 之類(lèi)的函數使用。

data

Arbitrary variable passed to callback.

返回值

eio_sync_file_range() returns request resource on success, 或者在失敗時(shí)返回 false.

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