/*
 * Copyright 2002-2019 Intel Corporation.
 * 
 * This software is provided to you as Sample Source Code as defined in the accompanying
 * End User License Agreement for the Intel(R) Software Development Products ("Agreement")
 * section 1.L.
 * 
 * This software and the related documents are provided as is, with no express or implied
 * warranties, other than those that are expressly stated in the License.
 */

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


void Handle(int, siginfo_t*, void*);
void MakeSegv();

int First = 1;


int main()
{
    struct sigaction sigact;

    sigact.sa_sigaction = Handle;
    sigact.sa_flags = (SA_RESETHAND | SA_SIGINFO);
    sigemptyset(&sigact.sa_mask);
    sigaddset(&sigact.sa_mask, SIGUSR1);
    if (sigaction(SIGSEGV, &sigact, 0) == -1)
    {
        printf("Unable to handle signal\n");
        return 1;
    }
    if (sigaction(SIGBUS, &sigact, 0) == -1)
    {
        printf("Unable to handle signal\n");
        return 1;
    }

    MakeSegv();
    printf("Should not return from first SEGV\n");
    return 1;
}

void Handle(int sig, siginfo_t* info, void* vctxt)
{
    struct sigaction sigact;

    if (sig == SIGSEGV)
        printf("Got signal SEGV\n");
    else if(sig == SIGBUS)
        printf("Got signal SIGBUS\n");
    else
        printf("Got signal %d\n", sig);

    /*
     * Print out some information about the SEGV disposition.  The handler should
     * be reset to SIG_DFL.  I'm not sure if the standard defines what happens to
     * the other fields.
     */
    if (sigaction(sig, 0, &sigact) == -1)
    {
        printf("Unable to read signal information\n");
        exit(1);
    }
    if (sigact.sa_handler == SIG_DFL)
        printf("sa_handler = SIG_DFL\n");
    else
        printf("sa_handler = 0x%p\n", sigact.sa_handler);
    if (sigact.sa_flags & (SA_RESETHAND | SA_SIGINFO))
        printf("sa_flags = [SA_RESETHAND, SA_SIGINFO]\n");
    else if (sigact.sa_flags & SA_RESETHAND)
        printf("sa_flags = [SA_RESETHAND]\n");
    else if (sigact.sa_flags & SA_SIGINFO)
        printf("sa_flags = [SA_SIGINFO]\n");
    else
        printf("sa_flags = []\n");
    if (sigismember(&sigact.sa_mask, SIGUSR1))
        printf("sa_mask = [SIGUSR1]\n");
    else
        printf("sa_mask = []\n");
    fflush(stdout);

    if (First)
    {
        First = 0;
        MakeSegv();
        /* does not return */
    }

    printf("Should not receive second SEGV\n");
    exit(1);
}

void MakeSegv()
{
    volatile int * p;
    int i;

    p = (volatile int *)0x9;
    i = *p;
}