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

# eio_fsync

(PECL eio >= 0.0.1dev)

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

### Description

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

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

### Parameters

`fd`
  Stream, Socket resource, or numeric file descriptor.
`pri`

  The request priority: `EIO_PRI_DEFAULT`, `EIO_PRI_MIN`, `EIO_PRI_MAX`, or `null`. If `null` passed, `pri` internally is set to `EIO_PRI_DEFAULT`.

`callback`

  `callback` function is called when the request is done. It should match the following prototype:

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

    is custom data passed to the request.

  `result`

    request-specific result value; basically, the value returned by corresponding system call.

  `req`

    is optional request resource which can be used with functions like eio_get_last_error().

`data`
  Arbitrary variable passed to `callback`.

### Return Values

eio_fsync() returns request resource on success, or `false` on failure.

### See Also

- eio_sync() - Commit buffer cache to disk

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