CHANNEL_FLAGS_BUFSIZE_CHANGED
ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) {
priv->channel[CTCM_READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;
priv->channel[CTCM_WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED;