#include <stdio.h>
#include <pthread.h>
#include <signal.h>
#include <sys/mman.h>

sig_atomic_t abort_program = 0;

void signal_handler(int sig)
{
  abort_program = 1;
  printf("signal handled in: %lx\n", pthread_self());
}

int main(void)
{
    int err;
    struct sigaction action;
    sigset_t mask;

    printf("main thread: %lx\n", pthread_self());

    err = mlockall(MCL_CURRENT | MCL_FUTURE);
    printf("mlockall returned %d\n", err);

    action.sa_handler = signal_handler;
    sigemptyset(&action.sa_mask);
    action.sa_flags = 0;
    err = sigaction(SIGINT, &action, NULL);
    printf("sigaction returned %d\n", err);
    
    sigemptyset(&mask);
    sigaddset(&mask, SIGINT);
    err = pthread_sigmask(SIG_BLOCK, &mask, NULL);
    printf("pthread_sigmask returned %d\n", err);    

    while(!abort_program)
    {}

    printf("end of main\n");
  
    return 0;
}