* Called from the post_select function of the wng task. It must keep
* track of the the number of bytes consumed from the wng's buffer via
* the wn->written variable (which may be modified by the wng handling
* Called from the post_select function of the wng task. It must keep
* track of the the number of bytes consumed from the wng's buffer via
* the wn->written variable (which may be modified by the wng handling