Synchronize a file's in-core state with storage device

# eio_fdatasync

(PECL eio >= 0.0.1dev)

eio_fdatasync — Synchronize a file's in-core state with storage device

### 说明

function eio_fdatasync(
mixed `$fd`,
int `$pri` = EIO_PRI_DEFAULT,
callable `$callback` = NULL,
mixed `$data` = NULL
): resource

eio_fdatasync() synchronizes a file's in-core state with storage device.

### 参数

`fd`
  Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open().
`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_fdatasync() returns request resource on success, 或者在失败时返回 `false`.

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