You may try to register a custom function to a signal (i.e.: SIGTERM) so, when the signal is sent to your app, your function does its job, then the app closes as it does now.
Code is as follows:
@#include <signal.h>
void signalHandler(int signal);
int main(...){
//...
//configure app's reaction to OS signals
struct sigaction act, oact;
memset((void*)&act, 0, sizeof(struct sigaction));
memset((void*)&oact, 0, sizeof(struct sigaction));
act.sa_flags = 0;
act.sa_handler = &signalHandler;
sigaction(SIGINT, &act, &oact);
sigaction(SIGKILL, &act, &oact);
sigaction(SIGQUIT, &act, &oact);
sigaction(SIGSTOP, &act, &oact);
sigaction(SIGTERM, &act, &oact);
sigaction(SIGSEGV, &act, &oact);
//...
}
void signalHandler(int signal)
{
//print received signal
switch(signal){
case SIGINT: printf("SIGINT => "); break;
case SIGKILL: printf("SIGKILL => "); break;
case SIGQUIT: printf("SIGQUIT => "); break;
case SIGSTOP: printf("SIGSTOP => "); break;
case SIGTERM: printf("SIGTERM => "); break;
case SIGSEGV: printf("SIGSEGV => "); break;
default: printf("APPLICATION EXITING => "); break;
}
//print call stack (needs #include <execinfo.h>)
/*int callstack_size = 2048;
void* callstack[callstack_size];
int i, frames = backtrace(callstack, callstack_size);
char** strs = backtrace_symbols(callstack, frames);
for(i = 0; i < frames; i++){
printf("%s\n", strs[i]);
}
free(strs);*/
//... (do something else)
//app ends as expected
fprintf(stderr, "Thus ends!!");
QApplication::quit();
}@
