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(PECL eio >= 0.0.1dev)
eio_sendfile — Transfer data between file descriptors
$out_fd
, mixed $in_fd
, int $offset
, int $length
[, int $pri
[, callable $callback
[, string $data
]]] )eio_sendfile() copies data between one file descriptor and another. See SENDFILE(2) man page for details.
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.
eio_sendfile() returns request resource on success or FALSE on error.