(PECL eio >= 0.0.1dev)
eio_fallocate — Allows the caller to directly manipulate the allocated disk space for a file
$fd
, int $mode
, int $offset
, int $length
[, int $pri
= EIO_PRI_DEFAULT
[, callable $callback
= NULL
[, mixed $data
= NULL
]]] )
eio_fallocate() allows the caller to directly manipulate the allocated disk space for the
file specified by fd
file descriptor for the byte
range starting at offset
and continuing for
length
bytes.
Note: File should be opened for writing
EIO_O_CREAT
should be logically OR'd withEIO_O_WRONLY
, orEIO_O_RDWR
fd
The file descriptor, e.g. returned by eio_open().
mode
Currently only one flag is supported for mode:
EIO_FALLOC_FL_KEEP_SIZE
(the same as POSIX constant
FALLOC_FL_KEEP_SIZE
).
offset
Specifies start of the byte range.
length
Specifies length the byte range.
pri
The request priority: EIO_PRI_DEFAULT
, EIO_PRI_MIN
, EIO_PRI_MAX
, or NULL
.
If NULL
passed, pri
internally is set to
EIO_PRI_DEFAULT
.
callback
callback
function is called when the request is done.
It should match the following prototype:
void callback($data, $result);
$data
is custom
data passed to the request.
$result
contains
request-specific result value; basically, the value returned by corresponding
system call.
data
Arbitrary variable passed to callback
.
eio_fallocate() returns request resource on success or FALSE
on error.