(PECL eio >= 0.0.1dev)
eio_fallocate — Allows the caller to directly manipulate the allocated disk space for a file
$fd
,$mode
,$offset
,$length
,$pri
= EIO_PRI_DEFAULT,$callback
= NULL,$data
= NULLeio_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
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
.
eio_fallocate() returns request resource on success, or false
on failure.