SA_NODEFER
oact->sa_flags |= SA_NODEFER;
if (act->sa_flags & SA_NODEFER)
sa.sa_flags |= SA_NODEFER;
sa.sa_flags |= SA_NODEFER;
sa.sa_flags |= SA_SIGINFO | SA_NODEFER;
sa.sa_flags &= ~SA_NODEFER;
#define SV_NODEFER SA_NODEFER
act.sa_flags = SA_NODEFER;