eio_fallocate

(PECL eio >= 0.0.1dev)

eio_fallocate — Allows the caller to directly manipulate the allocated disk space for a file

說明

resource eio_fallocate ( mixed $fd , int $mode , int $offset , int $length [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]] )

eio_fallocate() allows the caller to directly manipulate the allocated disk space for the file specified by fd file descriptor for the byte range starting at offset and continuing for length bytes.

Note: File should be opened for writing

EIO_O_CREAT should be logically OR'd with EIO_O_WRONLY, or EIO_O_RDWR

參數

fd

Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open().

mode

Currently only one flag is supported for mode: EIO_FALLOC_FL_KEEP_SIZE (the same as POSIX constant FALLOC_FL_KEEP_SIZE).

offset

Specifies start of the byte range.

length

Specifies length the byte range.

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

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