Hvordan bruger man sigaction sammen med klasser?

Hvordan bruger man dette når kan opbygget med klasser:
The following C code illustrates how to use the SIGINT and SIGQUIT signals to shutdown a UNIX application process when a user types control-C or control-\, respectively. Much of the error handling logic has been omitted to save space and reduce unnecessary details.

/* Global variables that control
  process shutdown. */
sig_atomic_t graceful_quit = 0;
sig_atomic_t abortive_quit = 0;

/* Signal handler for SIGINT. */
void SIGINT_handler (int signum)
{
  assert (signum == SIGINT);
  graceful_quit = 1;
}

/* Signal handler for SIGQUIT. */
void SIGQUIT_handler (int signum)
{
  assert (signum == SIGQUIT);
  abortive_quit = 1;
}

/* ... */

int main (void)
{
  struct sigaction sa;
  sigemptyset (&sa.sa_mask);
  sa.sa_flags = 0;

  /* Register the handler for SIGINT. */
  sa.sa_handler = SIGINT_handler;
  sigaction (SIGINT, &sa, 0);

  /* Register the handler for SIGQUIT. */
  sa.sa_handler =  SIGQUIT_handler;
  sigaction (SIGQUIT, &sa, 0);

  /* Run the main event loop. */
  while (graceful_quit == 0
        && abortive_quit == 0)
    do_work ();

  if (abortive_quit == 1) {
    _exit (1);
  }
  else if graceful_quit {
    clean_up ();
    exit (0);
  }

  /* NOTREACHED */
}



Det er reelt dette som er problemet: sa.sa_handler = SIGQUIT_handler;

Hvis SIGQUIT_handler-funktionen er en medlemsfunktion får man en compiler fejl.