sig.c

android-w.song.android.widget

    {
      /* Skip a signal if it's trapped or handled specially, because the
	 trap code will restore the correct value. */
      if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i)))
	continue;

      act.sa_handler = XHANDLER (i);
      act.sa_flags = XSAFLAGS (i);
      sigaction (XSIG (i), &act, (struct sigaction *) NULL);
    }
#else /* !HAVE_POSIX_SIGNALS */
  for (i = 0; i < TERMSIGS_LENGTH; i++)
    {
      if (signal_is_trapped (XSIG (i)) || signal_is_special (XSIG (i)))
	continue;

      signal (XSIG (i), XHANDLER (i));
    }
#endif /* !HAVE_POSIX_SIGNALS */
}
#undef XSIG
#undef XHANDLER

/* Run some of the cleanups that should be performed when we run
   jump_to_top_level from a builtin command context.  XXX - might want to
   also call reset_parser here. */
void
top_level_cleanup ()
{
  /* Clean up string parser environment. */
  while (parse_and_execute_level)
    parse_and_execute_cleanup ();

#if defined (PROCESS_SUBSTITUTION)
  unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */

  run_unwind_protects ();
  loop_level = continuing = breaking = funcnest = 0;
  executing_list = comsub_ignore_return = return_catch_flag = 0;
}

/* What to do when we've been interrupted, and it is safe to handle it. */
void
throw_to_top_level ()
{
  int print_newline = 0;

  if (interrupt_state)
    {
      print_newline = 1;
      DELINTERRUPT;
    }

  if (interrupt_state)
    return;

  last_command_exit_signal = (last_command_exit_value > 128) ?
				(last_command_exit_value - 128) : 0;
  last_command_exit_value |= 128;

  /* Run any traps set on SIGINT. */
  run_interrupt_trap ();

  /* Clean up string parser environment. */
  while (parse_and_execute_level)
    parse_and_execute_cleanup ();

#if defined (JOB_CONTROL)
  give_terminal_to (shell_pgrp, 0);
#endif /* JOB_CONTROL */

#if defined (JOB_CONTROL) || defined (HAVE_POSIX_SIGNALS)
  /* This should not be necessary on systems using sigsetjmp/siglongjmp. */
  sigprocmask (SIG_SETMASK, &top_level_mask, (sigset_t *)NULL);
#endif

  reset_parser ();

#if defined (READLINE)
  if (interactive)
    bashline_reset ();
#endif /* READLINE */

#if defined (PROCESS_SUBSTITUTION)
  unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */

  run_unwind_protects ();
  loop_level = continuing = breaking = funcnest = 0;
  executing_list = comsub_ignore_return = return_catch_flag = 0;

  if (interactive && print_newline)
    {
      fflush (stdout);
      fprintf (stderr, "\n");
      fflush (stderr);
    }

  /* An interrupted `wait' command in a script does not exit the script. */
  if (interactive || (interactive_shell && !shell_initialized) ||
      (print_newline && signal_is_trapped (SIGINT)))
    jump_to_top_level (DISCARD);
  else
    jump_to_top_level (EXITPROG);
}

/* This is just here to isolate the longjmp calls. */
void
jump_to_top_level (value)
     int value;
{
  longjmp (top_level, value);
}

sighandler
termsig_sighandler (sig)
     int sig;
{
  /* If we get called twice with the same signal before handling it,
     terminate right away. */
  if (
#ifdef SIGHUP
    sig != SIGHUP &&
#endif
#ifdef SIGINT
    sig != SIGINT &&
#endif
#ifdef SIGDANGER
    sig != SIGDANGER &&
#endif
#ifdef SIGPIPE
    sig != SIGPIPE &&
#endif
#ifdef SIGALRM
    sig != SIGALRM &&
#endif
#ifdef SIGTERM
    sig != SIGTERM &&
#endif
#ifdef SIGXCPU
    sig != SIGXCPU &&
#endif
#ifdef SIGXFSZ
    sig != SIGXFSZ &&
#endif
#ifdef SIGVTALRM
    sig != SIGVTALRM &&
#endif
#ifdef SIGLOST
    sig != SIGLOST &&
#endif
#ifdef SIGUSR1
    sig != SIGUSR1 &&
#endif
#ifdef SIGUSR2
   sig != SIGUSR2 &&
#endif
   sig == terminating_signal)
    terminate_immediately = 1;

  terminating_signal = sig;

  /* XXX - should this also trigger when interrupt_immediately is set? */
  if (terminate_immediately)
    {
#if defined (HISTORY)
      /* XXX - will inhibit history file being written */
      history_lines_this_session = 0;
#endif
      terminate_immediately = 0;
      termsig_handler (sig);
    }

  SIGRETURN (0);
}

void
termsig_handler (sig)
     int sig;
{
  static int handling_termsig = 0;

  /* Simple semaphore to keep this function from being executed multiple
     times.  Since we no longer are running as a signal handler, we don't
     block multiple occurrences of the terminating signals while running. */
  if (handling_termsig)
    return;
  handling_termsig = 1;
  terminating_signal = 0;	/* keep macro from re-testing true. */

  /* I don't believe this condition ever tests true. */
  if (sig == SIGINT && signal_is_trapped (SIGINT))
    run_interrupt_trap ();

#if defined (HISTORY)
  if (interactive_shell && sig != SIGABRT)
    maybe_save_shell_history ();
#endif /* HISTORY */

#if defined (JOB_CONTROL)
  if (sig == SIGHUP && (interactive || (subshell_environment & (SUBSHELL_COMSUB|SUBSHELL_PROCSUB))))
    hangup_all_jobs ();
  end_job_control ();
#endif /* JOB_CONTROL */

#if defined (PROCESS_SUBSTITUTION)
  unlink_fifo_list ();
#endif /* PROCESS_SUBSTITUTION */

  /* Reset execution context */
  loop_level = continuing = breaking = funcnest = 0;
  executing_list = comsub_ignore_return = return_catch_flag = 0;

  run_exit_trap ();
  set_signal_handler (sig, SIG_DFL);
  kill (getpid (), sig);
}

/* What we really do when SIGINT occurs. */
sighandler
sigint_sighandler (sig)
     int sig;
{
#if defined (MUST_REINSTALL_SIGHANDLERS)
  signal (sig, sigint_sighandler);
#endif

  /* interrupt_state needs to be set for the stack of interrupts to work
     right.  Should it be set unconditionally? */
  if (interrupt_state == 0)
    ADDINTERRUPT;

  if (interrupt_immediately)
    {
      interrupt_immediately = 0;
      last_command_exit_value = 128 + sig;
      throw_to_top_level ();
    }

  SIGRETURN (0);
}

#if defined (SIGWINCH)
sighandler
sigwinch_sighandler (sig)
     int sig;
{
#if defined (MUST_REINSTALL_SIGHANDLERS)
  set_signal_handler (SIGWINCH, sigwinch_sighandler);
#endif /* MUST_REINSTALL_SIGHANDLERS */
  sigwinch_received = 1;
  SIGRETURN (0);
}
#endif /* SIGWINCH */

void
set_sigwinch_handler ()
{
#if defined (SIGWINCH)
 old_winch = set_signal_handler (SIGWINCH, sigwinch_sighandler);
#endif
}

void
unset_sigwinch_handler ()
{
#if defined (SIGWINCH)
  set_signal_handler (SIGWINCH, old_winch);
#endif
}

/* Signal functions used by the rest of the code. */
#if !defined (HAVE_POSIX_SIGNALS)

#if defined (JOB_CONTROL)
/* Perform OPERATION on NEWSET, perhaps leaving information in OLDSET. */
sigprocmask (operation, newset, oldset)
     int operation, *newset, *oldset;
{
  int old, new;

  if (newset)
    new = *newset;
  else
    new = 0;

  switch (operation)
    {
    case SIG_BLOCK:
      old = sigblock (new);
      break;

    case SIG_SETMASK:
      sigsetmask (new);
      break;

    default:
      internal_error (_("sigprocmask: %d: invalid operation"), operation);
    }

  if (oldset)
    *oldset = old;
}
#endif /* JOB_CONTROL */

#else

#if !defined (SA_INTERRUPT)
#  define SA_INTERRUPT 0
#endif

#if !defined (SA_RESTART)
#  define SA_RESTART 0
#endif

SigHandler *
set_signal_handler (sig, handler)
     int sig;
     SigHandler *handler;
{
  struct sigaction act, oact;

  act.sa_handler = handler;
  act.sa_flags = 0;

  /* XXX - bash-4.2 */
  /* We don't want a child death to interrupt interruptible system calls, even
     if we take the time to reap children */
  if (sig == SIGCHLD)
    act.sa_flags |= SA_RESTART;		/* XXX */

  sigemptyset (&act.sa_mask);
  sigemptyset (&oact.sa_mask);
  sigaction (sig, &act, &oact);
  return (oact.sa_handler);
}
#endif /* HAVE_POSIX_SIGNALS */