278     for (const auto& handler : chains[signo].special_handlers_) {  in Handler()  local
279       if (handler.sc_sigaction == nullptr) {  in Handler()
286       bool handler_noreturn = (handler.sc_flags & SIGCHAIN_ALLOW_NORETURN);  in Handler()
288       linked_sigprocmask(SIG_SETMASK, &handler.sc_mask, &previous_mask);  in Handler()
295       if (handler.sc_sigaction(signo, siginfo, ucontext_raw)) {  in Handler()
326     auto handler = chains[signo].action_.sa_handler;  in Handler()  local
327     if (handler == SIG_IGN) {  in Handler()
329     } else if (handler == SIG_DFL) {  in Handler()
332       handler(signo);  in Handler()
381 extern "C" sighandler_t signal(int signo, sighandler_t handler) {  in signal()  argument
391   sa.sa_handler = handler;  in signal()
414 extern "C" sighandler_t bsd_signal(int signo, sighandler_t handler) {  in bsd_signal()  argument
417   return signal(signo, handler);  in bsd_signal()