Writing a fault handler

#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#define __USE_GNU
#include <sys/ucontext.h>
 
#define REG_PC    31
 
void setHandler(void (*handler)(int,siginfo_t *,void *))
{
    struct sigaction action;
    action.sa_flags = SA_SIGINFO;
    action.sa_sigaction = handler;
 
    if (sigaction(SIGFPE, &action, NULL) == -1) {
        perror("sigusr: sigaction");
        _exit(1);
    }
    if (sigaction(SIGSEGV, &action, NULL) == -1) {
        perror("sigusr: sigaction");
        _exit(1);
    }
    if (sigaction(SIGILL, &action, NULL) == -1) {
        perror("sigusr: sigaction");
        _exit(1);
    }
    if (sigaction(SIGBUS, &action, NULL) == -1) {
        perror("sigusr: sigaction");
        _exit(1);
    }
 
}
 
void catchit(int signo, siginfo_t *info, void *extra) 
{
    ucontext_t *p=(ucontext_t *)extra;
    int x;
    printf("Signal %d received from parent\n", signo);
    x= p->uc_mcontext.gregs[REG_PC];
    printf("address = %x\n",x);
    printf("siginfo address=%x\n",info->si_addr);
 
    setHandler(SIG_DFL);
    //abort();
 
}
 
int main()
{
    int x=9,y=0,z;
    int *p=20;
 
    setHandler(catchit);
 
    //*p=100;
    z=x/y;
    printf("%d\n",z);
    return 0;
}