S_IGN
action = S_IGN;
action = S_IGN;
action = S_IGN;
tsig = S_IGN;
case S_IGN: sigact = SIG_IGN; break;
if (sigmode[signo] != S_IGN && sigmode[signo] != S_HARD_IGN) {
sigmode[signo] = S_IGN;
if (*sm == S_IGN) {