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

static struct sigaction sa, old;
static sigjmp_buf env;

static void myalarm(int sig)
{
  printf("alarm!\n");
  siglongjmp(env,1);
}

int executer_avant_delai( void (*fun)(void *), void *parametre, int delai_en_seconde)
{
  int ret = 1;
  sa.sa_handler = myalarm;
  sa.sa_flags = 0; // SA_RESETHAND;
  sigemptyset(&sa.sa_mask);
  sigaction(SIGALRM, &sa, &old);

  alarm(delai_en_seconde);
  if(sigsetjmp(env,1) == 0)
    fun(parametre);
  else
    ret = 0; // alarm
  alarm(0);
  sigaction(SIGALRM, &old, NULL);
  return ret;
}