[Cppcms-users] Can't catch signals after service::run()

[CN <cn...@fa...>]

I have read
http://cppcms.com/wikipp/en/page/cppcms_1x_reload_application and the
mailing list archive dated 2013-11-19 08:05:50 GMT before posting my
question.

I need to do some clean-up tasks after the program is killed (kill
<pid>), but before it terminates. As shown below, version 1 can catch
signals.

Version 2 fails to catch signals. I wonder this is because
cppcms::service::run() overwrites all the signal specifications set
before it. How do I circumvent it?
//------------------------------------------------
#include <iostream>
#include <signal.h>
#include <unistd.h>
#include <cstring>
#include <cppcms/service.h>
#include <cppcms/thread_pool.h>
void signal_handler(int signal_number);
static bool got_signal=false;

int main(int argc,char ** argv)
{
	struct sigaction actions;
	memset(&actions,0,sizeof(actions));
	sigemptyset(&actions.sa_mask);
	actions.sa_flags=0;
	actions.sa_handler=signal_handler;
	int sig_result;
	if((sig_result=sigaction(SIGHUP,&actions,NULL)) != 0){
		std::cerr << "sigaction(SIGHUP) failed: " << sig_result
		<< std::endl;
		std::terminate();
	}
	if((sig_result=sigaction(SIGTERM,&actions,NULL)) != 0){
		std::cerr << "sigaction(SIGTERM) failed: " << sig_result
		<< std::endl;
		std::terminate();
	}
	/*
	//version 1: signal can be caught.
	while(true){
		std::cerr<<"loop"<<std::endl;
		if(got_signal){
			std::cerr<<"caught signal"<<std::endl;
			break;
		}
		sleep(1);
	}
	*/
	//version 2: signal can NOT be caught.
	cppcms::thread_pool pool(3);
	//pools.post(...);
	cppcms::service s(argc,argv);
	s.run();
	if(got_signal){
		pool.stop(); //Stop all in progress threads before
		program terminates.
		std::cerr<<"caught signal"<<std::endl;
	}
	return 0;
}

void signal_handler(int signal_number)
{
	got_signal=true;
}
//------------------------------------------------
Regards,
CN

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