system/kernel/signal.cpp

596 		ExecuteSignalHandler(uint32 signal, struct sigaction* handler)
599 			fHandler((void*)handler->sa_handler)
606 			out.Print("signal exec handler: signal: %" B_PRIu32 " (%s), "
607 				"handler: %p", fSignal, signal_name(fSignal), fHandler);
654 				"action: {handler: %p, flags: %#x, mask: %#" B_PRIx64 "}",
800 	\param handler The installed signal handler for the signal.
806 notify_debugger(Thread* thread, Signal* signal, struct sigaction& handler,
836 	return user_debug_handle_signal(signal->Number(), &handler, &info, deadly);
898 	// handler function
900 	frameData.handler = frameData.siginfo_handler
924 	signal handler is prepared, or whatever the signal demands.
1013 		struct sigaction handler;
1015 			handler = team->SignalActionFor(signal->Number());
1017 			handler.sa_handler = SIG_DFL;
1018 			handler.sa_flags = 0;
1021 		if ((handler.sa_flags & SA_ONESHOT) != 0
1022 			&& handler.sa_handler != SIG_IGN && handler.sa_handler != SIG_DFL) {
1040 		if (handler.sa_handler == SIG_IGN) {
1046 				notify_debugger(thread, signal, handler, false);
1048 		} else if (handler.sa_handler == SIG_DFL) {
1056 					notify_debugger(thread, signal, handler, false);
1067 						notify_debugger(thread, signal, handler, false);
1076 					// set up the signal handler
1077 					handler.sa_handler = thread->cancel_function;
1078 					handler.sa_flags = 0;
1079 					handler.sa_mask = 0;
1080 					handler.sa_userdata = NULL;
1095 						&& !notify_debugger(thread, signal, handler, false))
1120 						&& !notify_debugger(thread, signal, handler, false))
1200 						&& !notify_debugger(thread, signal, handler, true)) {
1238 		// User defined signal handler
1241 		if (debugSignal && !notify_debugger(thread, signal, handler, false))
1245 				|| (!alwaysRestart && (handler.sa_flags & SA_RESTART) == 0)) {
1249 		T(ExecuteSignalHandler(signal->Number(), &handler));
1251 		TRACE(("### Setting up custom signal handler frame...\n"));
1253 		// save the old block mask -- we may need to adjust it for the handler
1260 		// Update the block mask while the signal handler is running -- it
1262 		thread->sig_block_mask |= handler.sa_mask & BLOCKABLE_SIGNALS;
1264 		if ((handler.sa_flags & SA_NOMASK) == 0) {
1273 		setup_signal_frame(thread, &handler, signal, oldBlockMask);
1277 		// accordingly so that after the handler returns the thread's signal
2186 	// a signal handler, or restart the syscall, if there wasn't anything to
2458 	handler call.
2459 	This syscall is invoked when a signal handler function returns. It
2460 	deconstructs the signal handler frame and restores the stack and register
2469 		handler. Potentially some data (e.g. registers) have been modified by
2470 		the signal handler.