#include <sys/types.h>
#include <sys/signal.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>

#define FAULTADDR       0x123123

static void
handler(int sig, siginfo_t *sip, void *scp)
{
        char buf[1024];

        if (sip == NULL)
                _exit(1);
        if (sip->si_addr == 0)          /* wrong address */
                _exit(1);

        // snprintf(buf, sizeof buf, "addr %p\n", sip->si_addr);
        // write(STDOUT_FILENO, buf, strlen(buf));
        _exit(0);
}


int
main(int argc, char *argv[])
{
        struct sigaction sa;

        memset(&sa, 0, sizeof sa);
        sigfillset(&sa.sa_mask);
        sa.sa_sigaction = handler;
        sa.sa_flags = SA_SIGINFO;

        sigaction(SIGSEGV, &sa, NULL);
        sigaction(SIGBUS, &sa, NULL);

        *(char *)FAULTADDR = 0;
}