sa_sigaction
act.sa_sigaction = &ssh_sandbox_violation;
act.sa_sigaction = (__siginfohandler_t *)&sigcancel_handler;
(__sighandler_t *)act->sa_sigaction;
sa.sa_sigaction = exc_segfault;
sa.sa_sigaction = exc_debugger;
sa.sa_sigaction = ipisig;
sa.sa_sigaction = stopsig;
sa.sa_sigaction = kqueuesig;
sa.sa_sigaction = timersig;
sa.sa_sigaction = cosig;
sa.sa_sigaction = infosig;
sa.sa_sigaction = &sig_handler;