(PECL eio >= 0.0.1dev)
eio_dup2 — Duplicate a file descriptor
$fd
, mixed $fd2
[, int $pri = EIO_PRI_DEFAULT
[, callable $callback = NULL
[, mixed $data = NULL
]]] )eio_dup2() duplicates file descriptor.
fd
Source stream, Socket resource, or numeric file descriptor
fd2
Target stream, Socket resource, or numeric file descriptor
pri
请求的优先级: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL.
如果是 NULL , pri 将设为
EIO_PRI_DEFAULT.
callback
callback 函数将在请求结束时被调用.
必须符合此原型:
void callback($data, $result);
$data 是传给该请求的特定数据.
$result 包含特定请求的结果值, 通常是相应的系统调用的返回值.
data
Arbitrary variable passed to callback.
eio_dup2() returns request resource on success or FALSE on error.