Ejemplo n.º 1
0
void
initialize_info_signal_handler (void)
{
#ifdef SA_NOCLDSTOP
  /* (Based on info from Paul Eggert found in coreutils.)  Don't use
     HAVE_SIGACTION to decide whether to use the sa_handler, sa_flags,
     sa_mask members, as some systems (Solaris 7+) don't define them.  Use
     SA_NOCLDSTOP instead; it's been part of POSIX.1 since day 1 (in 1988).  */
  info_signal_handler.sa_handler = info_signal_proc;
  info_signal_handler.sa_flags = 0;
  mask_termsig (&info_signal_handler.sa_mask);
#endif /* SA_NOCLDSTOP */

#if defined (SIGTSTP)
  set_termsig (SIGTSTP, &old_TSTP);
  set_termsig (SIGTTOU, &old_TTOU);
  set_termsig (SIGTTIN, &old_TTIN);
#endif /* SIGTSTP */

#if defined (SIGWINCH)
  set_termsig (SIGWINCH, &old_WINCH);
#endif

#if defined (SIGQUIT)
  set_termsig (SIGQUIT, &old_QUIT);
#endif

#if defined (SIGINT)
  set_termsig (SIGINT, &old_INT);
#endif

#if defined (SIGTERM)
  set_termsig (SIGTERM, &old_TERM);
#endif

#if defined (SIGUSR1)
  /* Used by DJGPP to simulate SIGTSTP on Ctrl-Z.  */
  set_termsig (SIGUSR1, &old_USR1);
#endif
}
Ejemplo n.º 2
0
static RETSIGTYPE
info_signal_proc (int sig)
{
  signal_info *old_signal_handler = NULL;

#if !defined (HAVE_SIGACTION)
  /* best effort: first increment this counter and later block signals */
  if (term_conf_busy)
    return;
  term_conf_busy++;
#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
    {
      sigset_t nvar, ovar;
      sigemptyset (&nvar);
      mask_termsig (&nvar);
      sigprocmask (SIG_BLOCK, &nvar, &ovar);
    }
#endif /* HAVE_SIGPROCMASK || HAVE_SIGSETMASK */
#endif /* !HAVE_SIGACTION */
  switch (sig)
    {
#if defined (SIGTSTP)
    case SIGTSTP:
    case SIGTTOU:
    case SIGTTIN:
#endif
#if defined (SIGQUIT)
    case SIGQUIT:
#endif
#if defined (SIGINT)
    case SIGINT:
#endif
      {
#if defined (SIGTSTP)
        if (sig == SIGTSTP)
          old_signal_handler = &old_TSTP;
        if (sig == SIGTTOU)
          old_signal_handler = &old_TTOU;
        if (sig == SIGTTIN)
          old_signal_handler = &old_TTIN;
#endif /* SIGTSTP */
#if defined (SIGQUIT)
        if (sig == SIGQUIT)
          old_signal_handler = &old_QUIT;
#endif /* SIGQUIT */
#if defined (SIGINT)
        if (sig == SIGINT)
          old_signal_handler = &old_INT;
#endif /* SIGINT */

        /* For stop signals, restore the terminal IO, leave the cursor
           at the bottom of the window, and stop us. */
        terminal_goto_xy (0, screenheight - 1);
        terminal_clear_to_eol ();
        fflush (stdout);
        terminal_unprep_terminal ();
	restore_termsig (sig, old_signal_handler);
	UNBLOCK_SIGNAL (sig);
	kill (getpid (), sig);

        /* The program is returning now.  Restore our signal handler,
           turn on terminal handling, redraw the screen, and place the
           cursor where it belongs. */
        terminal_prep_terminal ();
	set_termsig (sig, old_signal_handler);
	/* window size might be changed while sleeping */
	reset_info_window_sizes ();
      }
      break;

#if defined (SIGWINCH) || defined (SIGUSR1)
#ifdef SIGWINCH
    case SIGWINCH:
#endif
#ifdef SIGUSR1
    case SIGUSR1:
#endif
      {
	/* Turn off terminal IO, tell our parent that the window has changed,
	   then reinitialize the terminal and rebuild our windows. */
#ifdef SIGWINCH
	if (sig == SIGWINCH)
	  old_signal_handler = &old_WINCH;
#endif
#ifdef SIGUSR1
	if (sig == SIGUSR1)
	  old_signal_handler = &old_USR1;
#endif
	terminal_goto_xy (0, 0);
	fflush (stdout);
	terminal_unprep_terminal (); /* needless? */
	restore_termsig (sig, old_signal_handler);
	UNBLOCK_SIGNAL (sig);
	kill (getpid (), sig);

	/* After our old signal handler returns... */
	set_termsig (sig, old_signal_handler); /* needless? */
	terminal_prep_terminal ();
	reset_info_window_sizes ();
      }
      break;
#endif /* SIGWINCH || SIGUSR1 */
    }
#if !defined (HAVE_SIGACTION)
  /* at this time it is safer to perform unblock after decrement */
  term_conf_busy--;
#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
    {
      sigset_t nvar, ovar;
      sigemptyset (&nvar);
      mask_termsig (&nvar);
      sigprocmask (SIG_UNBLOCK, &nvar, &ovar);
    }
#endif /* HAVE_SIGPROCMASK || HAVE_SIGSETMASK */
#endif /* !HAVE_SIGACTION */
}