#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>

void usr1handler(int signal);

int main(void) {
    signal(SIGUSR1, usr1handler);

    printf("My pid is: %d\n", getpid());

    for(;;) {
        sleep(1);
    }
    return 0;
}

void usr1handler(int signal) {
    printf("Got a signal: %d\n", signal);
}