Symbol: SC_TBUSY
sys/net/if_ppp.c
1101
sc->sc_flags &= ~SC_TBUSY;
sys/net/if_ppp.c
1273
if (!(sc->sc_flags & SC_TBUSY) &&
sys/net/if_ppp.c
1278
sc->sc_flags |= SC_TBUSY;