Allows the caller to directly manipulate the allocated disk space for a file

# eio_fallocate

(PECL eio >= 0.0.1dev)

eio_fallocate — Allows the caller to directly manipulate the allocated disk space for a file

### Description

eio_fallocate(
mixed `$fd`,
int `$mode`,
int `$offset`,
int `$length`,
int `$pri` = EIO_PRI_DEFAULT,
callable `$callback` = NULL,
mixed `$data` = NULL
): resource

eio_fallocate() allows the caller to directly manipulate the allocated disk space for the file specified by `fd` file descriptor for the byte range starting at `offset` and continuing for `length` bytes.

> Note: File should be opened for writing
> `EIO_O_CREAT` should be logically OR'd with `EIO_O_WRONLY`, or `EIO_O_RDWR`

### Parameters

`fd`
  Stream, Socket resource, or numeric file descriptor, e.g. returned by eio_open().
`mode`
  Currently only one flag is supported for mode: `EIO_FALLOC_FL_KEEP_SIZE` (the same as POSIX constant `FALLOC_FL_KEEP_SIZE`).
`offset`
  Specifies start of the byte range.
`length`
  Specifies length the byte range.
`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_fallocate() returns request resource on success, or `false` on failure.

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