}

	C.changeSignalStack()
	defer C.restoreSignalStack()
	defer func() {
		if recover() == nil {
			t.Error("did not see expected panic")
		}
	}()
	v := 1 / int(C.zero())
	t.Errorf("unexpected success of division by zero == %d", v)

		return 2;
	}
	oldHandler = osa.sa_sigaction;

	return 0;
}

int check_handler() {
	if (sigaction(SIGSEGV, NULL, &sa) < 0) {
		perror("sigaction check");
		return 2;
	}
	if (sa.sa_sigaction != handler) {
		fprintf(stderr, "ERROR: wrong signal handler: %p != %p\n", sa.sa_sigaction, handler);
		return 2;
	}
	return 0;

	if (stack1 == NULL) {
		perror("malloc");
		exit(1);
	}

	// Allocate the second stack before freeing the first to ensure we don't get
	// the same address from malloc.
	//
	// Will be freed in stackSwitchThread2.
	stack2 = malloc(STACK_SIZE);
	if (stack1 == NULL) {
		perror("malloc");
		exit(1);
	}

	if (getcontext(&uctx_switch) == -1) {
		perror("getcontext");
		exit(1);
	}

	pthread_sigmask(SIG_SETMASK, &ign, &oset);

	pthread_attr_init(&attr);

	if (pthread_attr_getstack(&attr, &base, &size) != 0)
		perror("runtime/cgo: pthread_attr_getstack failed");
	if (size == 0) {
		ts->g->stackhi = 2 << 20;
		if (pthread_attr_setstack(&attr, NULL, ts->g->stackhi) != 0)
			perror("runtime/cgo: pthread_attr_setstack failed");
	} else {
		ts->g->stackhi = size;
	}

	void* base = mmap(0, CSIGSTKSZ, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
	if (base == MAP_FAILED) {
		perror("mmap failed");
		abort();
	}
	stack_t st = {}, ost = {};
	st.ss_sp = (char*)base;
	st.ss_flags = 0;
	st.ss_size = CSIGSTKSZ;
	if (sigaltstack(&st, &ost) < 0) {
		perror("sigaltstack failed");
		abort();
	}

	// Call Go.
	SigStackCallback();

	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_ONSTACK;
	sa.sa_handler = raise_usr2;

	if (sigaction(SIGUSR1, &sa, NULL) != 0) {
		perror("failed to register SIGUSR1 handler");
		exit(EXIT_FAILURE);
	}
}
*/
import "C"

func main() {
	ch := make(chan os.Signal, 1)
	signal.Notify(ch, syscall.SIGUSR2)

package main

/*
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

// Raise SIGPIPE.
static void CRaiseSIGPIPE() {
	int fds[2];

	if (pipe(fds) == -1) {
		perror("pipe");
		exit(EXIT_FAILURE);
	}
	// Close the reader end
	close(fds[0]);
	// Write to the writer end to provoke a SIGPIPE
	if (write(fds[1], "some data", 9) != -1) {

      ;
    printf("Child exiting: pid=%d ppid=%d\n", getpid(), getppid());
    return 0;
  } else if (pid > 0) {
    printf("Parent exiting: pid=%d ppid=%d\n", getpid(), getppid());
    return 0;
  }
  perror("Could not create child");
  return 1;

	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
	sa.sa_sigaction = forwardSignal;

	if (sigaction(SIGSEGV, &sa, &prev_sa) != 0) {
		perror("failed to register SEGV forwarder");
		exit(EXIT_FAILURE);
	}
}
*/
import "C"

func main() {
	C.registerSegvFowarder()

	defer func() {
		recover()
	}()
	var nilp *int
	*nilp = 42

static void register_handler() {
	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = SA_SIGINFO;
	sa.sa_sigaction = check_params;

	if (sigaction(SIGUSR1, &sa, NULL) != 0) {
		perror("failed to register SIGUSR1 handler");
		exit(EXIT_FAILURE);
	}
}
*/
import "C"

import "syscall"

func init() {
	C.raise(C.int(syscall.SIGUSR1))
}