#define _GNU_SOURCE
#include <stdio.h>
#include <signal.h>
#include <setjmp.h>

static sigjmp_buf buf;

static void handler(int sig)
{
  siglongjmp(buf, 1);
}

int essayer(void (*f)(), int sig)
{
  int r = 0;

  struct sigaction sa, old;
  sa.sa_handler = handler;
  sa.sa_flags = 0;
  sigemptyset(&sa.sa_mask);
  sigaction(sig, &sa, &old);

  if(sigsetjmp(buf, 1) == 0)
    f();
  else r = 1;
  
  sigaction(sig, &old, NULL);

  return r;
}

void toto()
{
  *(int *)0L = 12; // SEGV
}

int main(int argc, char *argv[])
{
  printf("essai de toto : %s\n", essayer(toto, SIGSEGV) == 0 ? "ok" : "echec");
  return 0;
}