How to find out pid of the process from a signal is initiated in c++ in linux?

Question

My application create child process using fork(). I have a signal handler in parent process. In signal handler i have to do different logic for parent and child. ie in signal handler

case SIGSEGV:
              if (parent)
              {
                  cout<<"signal from parent";
              }
              else
              {
                  cout <<"signal from child";
              }

Is it possible? or i have to keep two different signal handlers?

Answer 1

Check the usage of signalfd ( man signalfd ) with select and read as this last will give you signalfd_siginfo structure, which has

uint32_t ssi_pid;     /* PID of sender */

Maybe this will help you.