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

void handler(int s)
{
	if (s == SIGBUS) printf(" now got a bus error signal \n");
	if (s == SIGSEGV) printf(" now got a segmentation violation signal \n");
	if (s == SIGILL) printf(" now got a illegal instruction signal \n");
	exit(1);
}

int main(void)
{
	printf("begin \n");
	int *p = NULL;
	signal(SIGBUS, handler);
	signal(SIGSEGV, handler);
	signal(SIGILL, handler);
	*p = 0;
	printf("end \n");
}