Php/docs/function.eio-fallocate
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 withEIO_O_WRONLY
, orEIO_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 constantFALLOC_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
, orNULL
. IfNULL
passed,pri
internally is set toEIO_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 error.