truncate
open fun truncate(offset: Long, cancellable: Cancellable? = null): <Error class: unknown class><Boolean>
Sets the length of the stream to @offset. 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.
If @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.
Return
true if successful. If an error has occurred, this function will return false and set @error appropriately if present.
Parameters
offset
new length for @seekable, in bytes.
cancellable
optional #GCancellable object, null to ignore.