signals.c

来自「android-w.song.android.widget」· C语言 代码 · 共 672 行 · 第 1/2 页

{
  sighandler_cxt dummy;
  SigHandler *oh;
#if defined (HAVE_POSIX_SIGNALS)
  static int sigmask_set = 0;
  static sigset_t bset, oset;
#endif

#if defined (HAVE_POSIX_SIGNALS)
  if (rl_catch_signals && sigmask_set == 0)
    {
      sigemptyset (&bset);

      sigaddset (&bset, SIGINT);
      sigaddset (&bset, SIGTERM);
#if defined (SIGQUIT)
      sigaddset (&bset, SIGQUIT);
#endif
#if defined (SIGALRM)
      sigaddset (&bset, SIGALRM);
#endif
#if defined (SIGTSTP)
      sigaddset (&bset, SIGTSTP);
#endif
#if defined (SIGTTIN)
      sigaddset (&bset, SIGTTIN);
#endif
#if defined (SIGTTOU)
      sigaddset (&bset, SIGTTOU);
#endif
      sigmask_set = 1;
    }      
#endif /* HAVE_POSIX_SIGNALS */

  if (rl_catch_signals && signals_set_flag == 0)
    {
#if defined (HAVE_POSIX_SIGNALS)
      sigemptyset (&oset);
      sigprocmask (SIG_BLOCK, &bset, &oset);
#endif

      rl_maybe_set_sighandler (SIGINT, rl_signal_handler, &old_int);
      rl_maybe_set_sighandler (SIGTERM, rl_signal_handler, &old_term);
#if defined (SIGQUIT)
      rl_maybe_set_sighandler (SIGQUIT, rl_signal_handler, &old_quit);
#endif

#if defined (SIGALRM)
      oh = rl_set_sighandler (SIGALRM, rl_signal_handler, &old_alrm);
      if (oh == (SigHandler *)SIG_IGN)
	rl_sigaction (SIGALRM, &old_alrm, &dummy);
#if defined (HAVE_POSIX_SIGNALS) && defined (SA_RESTART)
      /* If the application using readline has already installed a signal
	 handler with SA_RESTART, SIGALRM will cause reads to be restarted
	 automatically, so readline should just get out of the way.  Since
	 we tested for SIG_IGN above, we can just test for SIG_DFL here. */
      if (oh != (SigHandler *)SIG_DFL && (old_alrm.sa_flags & SA_RESTART))
	rl_sigaction (SIGALRM, &old_alrm, &dummy);
#endif /* HAVE_POSIX_SIGNALS */
#endif /* SIGALRM */

#if defined (SIGTSTP)
      rl_maybe_set_sighandler (SIGTSTP, rl_signal_handler, &old_tstp);
#endif /* SIGTSTP */

#if defined (SIGTTOU)
      rl_maybe_set_sighandler (SIGTTOU, rl_signal_handler, &old_ttou);
#endif /* SIGTTOU */

#if defined (SIGTTIN)
      rl_maybe_set_sighandler (SIGTTIN, rl_signal_handler, &old_ttin);
#endif /* SIGTTIN */

      signals_set_flag = 1;

#if defined (HAVE_POSIX_SIGNALS)
      sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
#endif
    }

#if defined (SIGWINCH)
  if (rl_catch_sigwinch && sigwinch_set_flag == 0)
    {
      rl_maybe_set_sighandler (SIGWINCH, rl_sigwinch_handler, &old_winch);
      sigwinch_set_flag = 1;
    }
#endif /* SIGWINCH */

  return 0;
}

int
rl_clear_signals ()
{
  sighandler_cxt dummy;

  if (rl_catch_signals && signals_set_flag == 1)
    {
      sigemptyset (&dummy.sa_mask);

      rl_sigaction (SIGINT, &old_int, &dummy);
      rl_sigaction (SIGTERM, &old_term, &dummy);
#if defined (SIGQUIT)
      rl_sigaction (SIGQUIT, &old_quit, &dummy);
#endif
#if defined (SIGALRM)
      rl_sigaction (SIGALRM, &old_alrm, &dummy);
#endif

#if defined (SIGTSTP)
      rl_sigaction (SIGTSTP, &old_tstp, &dummy);
#endif /* SIGTSTP */

#if defined (SIGTTOU)
      rl_sigaction (SIGTTOU, &old_ttou, &dummy);
#endif /* SIGTTOU */

#if defined (SIGTTIN)
      rl_sigaction (SIGTTIN, &old_ttin, &dummy);
#endif /* SIGTTIN */

      signals_set_flag = 0;
    }

#if defined (SIGWINCH)
  if (rl_catch_sigwinch && sigwinch_set_flag == 1)
    {
      sigemptyset (&dummy.sa_mask);
      rl_sigaction (SIGWINCH, &old_winch, &dummy);
      sigwinch_set_flag = 0;
    }
#endif

  return 0;
}

/* Clean up the terminal and readline state after catching a signal, before
   resending it to the calling application. */
void
rl_cleanup_after_signal ()
{
  _rl_clean_up_for_exit ();
  if (rl_deprep_term_function)
    (*rl_deprep_term_function) ();
  rl_clear_pending_input ();
  rl_clear_signals ();
}

/* Reset the terminal and readline state after a signal handler returns. */
void
rl_reset_after_signal ()
{
  if (rl_prep_term_function)
    (*rl_prep_term_function) (_rl_meta_flag);
  rl_set_signals ();
}

/* Free up the readline variable line state for the current line (undo list,
   any partial history entry, any keyboard macros in progress, and any
   numeric arguments in process) after catching a signal, before calling
   rl_cleanup_after_signal(). */ 
void
rl_free_line_state ()
{
  register HIST_ENTRY *entry;

  rl_free_undo_list ();

  entry = current_history ();
  if (entry)
    entry->data = (char *)NULL;

  _rl_kill_kbd_macro ();
  rl_clear_message ();
  _rl_reset_argument ();
}

#endif  /* HANDLE_SIGNALS */

/* **************************************************************** */
/*								    */
/*			   SIGINT Management			    */
/*								    */
/* **************************************************************** */

#if defined (HAVE_POSIX_SIGNALS)
static sigset_t sigint_set, sigint_oset;
static sigset_t sigwinch_set, sigwinch_oset;
#else /* !HAVE_POSIX_SIGNALS */
#  if defined (HAVE_BSD_SIGNALS)
static int sigint_oldmask;
static int sigwinch_oldmask;
#  endif /* HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

static int sigint_blocked;
static int sigwinch_blocked;

/* Cause SIGINT to not be delivered until the corresponding call to
   release_sigint(). */
void
_rl_block_sigint ()
{
  if (sigint_blocked)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigemptyset (&sigint_set);
  sigemptyset (&sigint_oset);
  sigaddset (&sigint_set, SIGINT);
  sigprocmask (SIG_BLOCK, &sigint_set, &sigint_oset);
#else /* !HAVE_POSIX_SIGNALS */
#  if defined (HAVE_BSD_SIGNALS)
  sigint_oldmask = sigblock (sigmask (SIGINT));
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sighold (SIGINT);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

  sigint_blocked = 1;
}

/* Allow SIGINT to be delivered. */
void
_rl_release_sigint ()
{
  if (sigint_blocked == 0)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigprocmask (SIG_SETMASK, &sigint_oset, (sigset_t *)NULL);
#else
#  if defined (HAVE_BSD_SIGNALS)
  sigsetmask (sigint_oldmask);
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sigrelse (SIGINT);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

  sigint_blocked = 0;
}

/* Cause SIGWINCH to not be delivered until the corresponding call to
   release_sigwinch(). */
void
_rl_block_sigwinch ()
{
  if (sigwinch_blocked)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigemptyset (&sigwinch_set);
  sigemptyset (&sigwinch_oset);
  sigaddset (&sigwinch_set, SIGWINCH);
  sigprocmask (SIG_BLOCK, &sigwinch_set, &sigwinch_oset);
#else /* !HAVE_POSIX_SIGNALS */
#  if defined (HAVE_BSD_SIGNALS)
  sigwinch_oldmask = sigblock (sigmask (SIGWINCH));
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sighold (SIGWINCH);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

  sigwinch_blocked = 1;
}

/* Allow SIGWINCH to be delivered. */
void
_rl_release_sigwinch ()
{
  if (sigwinch_blocked == 0)
    return;

#if defined (HAVE_POSIX_SIGNALS)
  sigprocmask (SIG_SETMASK, &sigwinch_oset, (sigset_t *)NULL);
#else
#  if defined (HAVE_BSD_SIGNALS)
  sigsetmask (sigwinch_oldmask);
#  else /* !HAVE_BSD_SIGNALS */
#    if defined (HAVE_USG_SIGHOLD)
  sigrelse (SIGWINCH);
#    endif /* HAVE_USG_SIGHOLD */
#  endif /* !HAVE_BSD_SIGNALS */
#endif /* !HAVE_POSIX_SIGNALS */

  sigwinch_blocked = 0;
}

/* **************************************************************** */
/*								    */
/*		Echoing special control characters		    */
/*								    */
/* **************************************************************** */
void
rl_echo_signal_char (sig)
     int sig;
{
  char cstr[3];
  int cslen, c;

  if (_rl_echoctl == 0 || _rl_echo_control_chars == 0)
    return;

  switch (sig)
    {
    case SIGINT:  c = _rl_intr_char; break;
#if defined (SIGQUIT)
    case SIGQUIT: c = _rl_quit_char; break;
#endif
#if defined (SIGTSTP)
    case SIGTSTP: c = _rl_susp_char; break;
#endif
    default: return;
    }

  if (CTRL_CHAR (c) || c == RUBOUT)
    {
      cstr[0] = '^';
      cstr[1] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
      cstr[cslen = 2] = '\0';
    }
  else
    {
      cstr[0] = c;
      cstr[cslen = 1] = '\0';
    }

  _rl_output_some_chars (cstr, cslen);
}