public abstract bool truncate (int64 offset, Cancellable? cancellable = null) throws Error
Sets the length of the stream to
If the stream was previously larger than
offset, the extra data is discarded. If the stream was previously shorter than
offset, it is extended with NUL ('\0') bytes.
cancellable is not null, then the operation can be cancelled by triggering the cancellable
object from another thread. If the operation was cancelled, the error g_io_error_cancelled will be returned.
If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.
new length for this, in bytes.
optional Cancellable object, null to ignore.
true if successful. If an error has occurred, this function will return false and set throws appropriately if present.