mbox_send
return mbox_send(state->mc, &msg, sizeof(msg));
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
mbox_send(sc->sc_mc, NULL, 0);
ret = mbox_send(sc->sc_mc_tx, NULL, 0);
int mbox_send(struct mbox_channel *, const void *, size_t);