eio_sendfile

(PECL eio >= 0.0.1dev)

eio_sendfile — Transfer data between file descriptors

說(shuō)明

eio_sendfile(
    mixed $out_fd,
    mixed $in_fd,
    int $offset,
    int $length,
    int $pri = ?,
    callable $callback = ?,
    string $data = ?
): resource

eio_sendfile() copies data between one file descriptor and another. See SENDFILE(2) man page for details.

參數(shù)

out_fd

Output stream, Socket resource, or file descriptor. Should be opened for writing.

in_fd

Input stream, Socket resource, or file descriptor. Should be opened for reading.

offset

Offset within the source file.

length

Number of bytes to copy.

pri

請(qǐng)求的優(yōu)先級(jí)：EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX 或 null。如果是 null，pri 將設(shè)為 EIO_PRI_DEFAULT。

callback

callback 函數(shù)在請(qǐng)求完成時(shí)被調(diào)用。其應(yīng)匹配一下原型：

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

傳遞給請(qǐng)求的用戶數(shù)據(jù)。

result

針對(duì)請(qǐng)求的結(jié)果的值。通常是相應(yīng)的系統(tǒng)調(diào)用返回的值。

req

可選的請(qǐng)求資源，可被 eio_get_last_error() 之類的函數(shù)使用。

data

Arbitrary variable passed to callback.

返回值

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