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

[Artyom B. <art...@ya...>]

By default, when the SIGTERM is sent to the application, the cppcms::run() exits and you can perform any cleanup you need.

No need to do anything special.

The situation described in wiki is for reloading (i.e. restarting the service rather than exiting the full program)

Artyom Beilis
--------------
CppCMS - C++ Web Framework:   http://cppcms.com/
CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/

--------------------------------------------
On Mon, 12/9/13, CN <cn...@fa...> wrote:

 Subject: [Cppcms-users] Can't catch signals after service::run()
 To: cpp...@li...
 Date: Monday, December 9, 2013, 5:35 PM
 
 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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 http://www.fastmail.fm - mmm... Fastmail...
 
 
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