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

void handler(int)
{
    puts("I'm a signal handler");
}

int main()
{
    struct sigaction sa;
    sa.sa_handler = handler;
    sigaction(SIGABRT, &sa, NULL);

    raise(SIGABRT);

    puts("I'm outside the signal handler!");

    return 0;
}