Php/docs/function.eio-ftruncate
eio_ftruncate
(PECL eio >= 0.0.1dev)
eio_ftruncate — Truncate a file
Description
eio_ftruncate
( mixed $fd
[, int $offset
= 0
[, int $pri
= EIO_PRI_DEFAULT
[, callable $callback
= NULL
[, mixed $data
= NULL
]]]] ) : resource
eio_ftruncate() causes a regular file referenced by
fd
file descriptor to be truncated to precisely
length
bytes.
Parameters
fd
Stream, Socket resource, or numeric file descriptor.
offset
Offset from beginning of the file
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_ftruncate() returns request resource on success or FALSE
on error.