How to execute a handler function before quit the program when receiving kill signal from“killall” or “kill -p pid”?

Question

I have the following code:

#include 
#include 
#include 

pthread_t test_thread;

void *thread_test_run (void *v)         


        

Answer 1

Because killall sends the signal SIGTERM by default, you can handle this type of signal.

#include 

void handler(int sig)
{
     /* ... */
}

signal (SIGTERM, handler);