SC_TBUSY          965 net/if_ppp.c       sc->sc_flags &= ~SC_TBUSY;
SC_TBUSY         1116 net/if_ppp.c   	if (!(sc->sc_flags & SC_TBUSY)
SC_TBUSY         1119 net/if_ppp.c   	    sc->sc_flags |= SC_TBUSY;