52   void Unclaim(int signal) {  in Unclaim()  argument
54     sigaction(signal, &action_, nullptr);        // Restore old action.  in Unclaim()
114 static void CheckSignalValid(int signal) {  in CheckSignalValid()  argument
115   if (signal <= 0 || signal >= _NSIG) {  in CheckSignalValid()
116     log("Invalid signal %d", signal);  in CheckSignalValid()
128 extern "C" void ClaimSignalChain(int signal, struct sigaction* oldaction) {  in ClaimSignalChain()  argument
129   CheckSignalValid(signal);  in ClaimSignalChain()
131   user_sigactions[signal].Claim(*oldaction);  in ClaimSignalChain()
134 extern "C" void UnclaimSignalChain(int signal) {  in UnclaimSignalChain()  argument
135   CheckSignalValid(signal);  in UnclaimSignalChain()
137   user_sigactions[signal].Unclaim(signal);  in UnclaimSignalChain()
169       signal(sig, SIG_DFL);  in InvokeUserSignalHandler()
179       signal(sig, SIG_DFL);  in InvokeUserSignalHandler()
185 extern "C" void EnsureFrontOfChain(int signal, struct sigaction* expected_action) {  in EnsureFrontOfChain()  argument
186   CheckSignalValid(signal);  in EnsureFrontOfChain()
190   linked_sigaction(signal, nullptr, &current_action);  in EnsureFrontOfChain()
195     user_sigactions[signal].Claim(current_action);  in EnsureFrontOfChain()
196     linked_sigaction(signal, expected_action, nullptr);  in EnsureFrontOfChain()
200 extern "C" int sigaction(int signal, const struct sigaction* new_action, struct sigaction* old_acti…  in sigaction()  argument
205   if (signal > 0 && signal < _NSIG && user_sigactions[signal].IsClaimed() &&  in sigaction()
207     struct sigaction saved_action = user_sigactions[signal].GetAction();  in sigaction()
209       user_sigactions[signal].SetAction(*new_action, false);  in sigaction()
233   return linked_sigaction(signal, new_action, old_action);  in sigaction()
236 extern "C" sighandler_t signal(int signal, sighandler_t handler) {  in signal()  argument
247   if (signal > 0 && signal < _NSIG && user_sigactions[signal].IsClaimed() && handler != SIG_DFL) {  in signal()
248     oldhandler = reinterpret_cast<sighandler_t>(user_sigactions[signal].GetAction().sa_handler);  in signal()
249     user_sigactions[signal].SetAction(sa, true);  in signal()
268   if (linked_sigaction(signal, &sa, &sa) == -1) {  in signal()
339 extern "C" void SetSpecialSignalHandlerFn(int signal, SpecialSignalHandlerFn fn) {  in SetSpecialSignalHandlerFn()  argument
340   CheckSignalValid(signal);  in SetSpecialSignalHandlerFn()
343   user_sigactions[signal].SetSpecialHandler(fn);  in SetSpecialSignalHandlerFn()
347   if (!user_sigactions[signal].IsClaimed()) {  in SetSpecialSignalHandlerFn()
355     if (sigaction(signal, &act, &old_act) != -1) {  in SetSpecialSignalHandlerFn()
356       user_sigactions[signal].Claim(old_act);  in SetSpecialSignalHandlerFn()