How to catch segmentation faults

catch_sigsegv.c

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

void myhandler(int signum)
{
    printf("got signal %d\n", signum);
    exit(1);
}

int main(void)
{
    signal(SIGSEGV, myhandler);
    int *a = NULL;
    *a = 42;
    return 0;
}