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/* Handling of inferior events for the event loop for GDB, the GNU debugger.

   Copyright (C) 1999, 2007, 2008 Free Software Foundation, Inc.

   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

#include "defs.h"

#include "inferior.h"           /* For fetch_inferior_event. */

#include "target.h"             /* For enum inferior_event_type. */

#include "event-loop.h"

#include "event-top.h"

#include "inf-loop.h"

#include "remote.h"

#include "exceptions.h"

static int fetch_inferior_event_wrapper (gdb_client_data client_data);

static void complete_execution (void);

void

inferior_event_handler_wrapper (gdb_client_data client_data)

{

  inferior_event_handler (INF_QUIT_REQ, client_data);

}

/* General function to handle events in the inferior. So far it just

   takes care of detecting errors reported by select() or poll(),

   otherwise it assumes that all is OK, and goes on reading data from

   the fd. This however may not always be what we want to do. */

void

inferior_event_handler (enum inferior_event_type event_type,

                        gdb_client_data client_data)

{

  switch (event_type)

    {

    case INF_ERROR:

      printf_unfiltered (_("error detected from target.\n"));

      target_async (NULL, 0);

      pop_target ();

      discard_all_continuations ();

      do_exec_error_cleanups (ALL_CLEANUPS);

      break;

    case INF_REG_EVENT:

      /* Use catch errors for now, until the inner layers of

         fetch_inferior_event (i.e. readchar) can return meaningful

         error status.  If an error occurs while getting an event from

         the target, just get rid of the target. */

      if (!catch_errors (fetch_inferior_event_wrapper,

                         client_data, "", RETURN_MASK_ALL))

        {

          target_async (NULL, 0);

          pop_target ();

          discard_all_continuations ();

          do_exec_error_cleanups (ALL_CLEANUPS);

          display_gdb_prompt (0);

        }

      break;

    case INF_EXEC_COMPLETE:

      /* Is there anything left to do for the command issued to

         complete? */

      do_all_continuations ();

      /* Reset things after target has stopped for the async commands. */

      complete_execution ();

      break;

    case INF_EXEC_CONTINUE:

      /* Is there anything left to do for the command issued to

         complete? */

      do_all_intermediate_continuations ();

      break;

    case INF_QUIT_REQ:

      /* FIXME: ezannoni 1999-10-04. This call should really be a

         target vector entry, so that it can be used for any kind of

         targets. */

      async_remote_interrupt_twice (NULL);

      break;

    case INF_TIMER:

    default:

      printf_unfiltered (_("Event type not recognized.\n"));

      break;

    }

}

static int

fetch_inferior_event_wrapper (gdb_client_data client_data)

{

  fetch_inferior_event (client_data);

  return 1;

}

/* Reset proper settings after an asynchronous command has finished.

   If the execution command was in synchronous mode, register stdin

   with the event loop, and reset the prompt. */

static void

complete_execution (void)

{

  target_executing = 0;

  /* Unregister the inferior from the event loop. This is done so that

     when the inferior is not running we don't get distracted by

     spurious inferior output. */

  target_async (NULL, 0);

  if (sync_execution)

    {

      do_exec_error_cleanups (ALL_CLEANUPS);

      display_gdb_prompt (0);

    }

  else

    {

      if (exec_done_display_p)

        printf_unfiltered (_("completed.\n"));

    }

}