Truncate a file

Beschreibung

resource eio_ftruncate ( mixed $fd [, int $offset = 0 [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]]] )

eio_ftruncate() causes a regular file referenced by fd file descriptor to be truncated to precisely length bytes.

Parameter-Liste

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, 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.

Rückgabewerte

eio_ftruncate() returns request resource on success or FALSE on error.

Siehe auch

eio_truncate