PHP Manual
Eio 函数
Transfer data between file descriptors

eio_sendfile

(PECL eio >= 0.0.1dev)

eio_sendfile — Transfer data between file descriptors

说明

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.

参数

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

请求的优先级：EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX 或 NULL。如果是 NULL，pri 将设为 EIO_PRI_DEFAULT。

callback

callback 函数在请求完成时被调用。其应匹配一下原型：

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

data: 传递给请求的用户数据。
result: 针对请求的结果的值。通常是相应的系统调用返回的值。
req: 可选的请求资源，可被 eio_get_last_error() 之类的函数使用。

data

Arbitrary variable passed to callback.

返回值

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

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