338 static int __sigaction(int signal, const SigactionType* new_action,  in __sigaction()  argument
346   if (signal <= 0 || signal >= _NSIG) {  in __sigaction()
351   if (chains[signal].IsClaimed()) {  in __sigaction()
352     SigactionType saved_action = chains[signal].GetAction<SigactionType>();  in __sigaction()
354       chains[signal].SetAction(new_action);  in __sigaction()
364   return linked(signal, new_action, old_action);  in __sigaction()
367 extern "C" int sigaction(int signal, const struct sigaction* new_action,  in sigaction()  argument
370   return __sigaction(signal, new_action, old_action, linked_sigaction);  in sigaction()
374 extern "C" int sigaction64(int signal, const struct sigaction64* new_action,  in sigaction64()  argument
377   return __sigaction(signal, new_action, old_action, linked_sigaction64);  in sigaction64()
381 extern "C" sighandler_t signal(int signo, sighandler_t handler) {  in signal()  function
417   return signal(signo, handler);  in bsd_signal()
463 extern "C" void AddSpecialSignalHandlerFn(int signal, SigchainAction* sa) {  in AddSpecialSignalHandlerFn()  argument
466   if (signal <= 0 || signal >= _NSIG) {  in AddSpecialSignalHandlerFn()
467     fatal("Invalid signal %d", signal);  in AddSpecialSignalHandlerFn()
471   chains[signal].AddSpecialHandler(sa);  in AddSpecialSignalHandlerFn()
472   chains[signal].Claim(signal);  in AddSpecialSignalHandlerFn()
475 extern "C" void RemoveSpecialSignalHandlerFn(int signal, bool (*fn)(int, siginfo_t*, void*)) {  in RemoveSpecialSignalHandlerFn()  argument
478   if (signal <= 0 || signal >= _NSIG) {  in RemoveSpecialSignalHandlerFn()
479     fatal("Invalid signal %d", signal);  in RemoveSpecialSignalHandlerFn()
482   chains[signal].RemoveSpecialHandler(fn);  in RemoveSpecialSignalHandlerFn()
485 extern "C" void EnsureFrontOfChain(int signal) {  in EnsureFrontOfChain()  argument
488   if (signal <= 0 || signal >= _NSIG) {  in EnsureFrontOfChain()
489     fatal("Invalid signal %d", signal);  in EnsureFrontOfChain()
495   linked_sigaction64(signal, nullptr, &current_action);  in EnsureFrontOfChain()
498   linked_sigaction(signal, nullptr, &current_action);  in EnsureFrontOfChain()
505     chains[signal].Register(signal);  in EnsureFrontOfChain()