gdb/inf-loop.c

   1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
   2    Copyright (C) 1999 Free Software Foundation, Inc.
   3    Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA. */
  21
  22 #include "defs.h"
  23 #include "inferior.h"           /* For fetch_inferior_event. */
  24 #include "target.h"             /* For enum inferior_event_type. */
  25 #include "event-loop.h"
  26 #include "event-top.h"
  27 #include "inf-loop.h"
  28 #include "remote.h"
  29 #include "exceptions.h"
  30
  31 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
  32 static void complete_execution (void);
  33
  34 void
  35 inferior_event_handler_wrapper (gdb_client_data client_data)
  36 {
  37   inferior_event_handler (INF_QUIT_REQ, client_data);
  38 }
  39
  40 /* General function to handle events in the inferior. So far it just
  41    takes care of detecting errors reported by select() or poll(),
  42    otherwise it assumes that all is OK, and goes on reading data from
  43    the fd. This however may not always be what we want to do. */
  44 void
  45 inferior_event_handler (enum inferior_event_type event_type,
  46                         gdb_client_data client_data)
  47 {
  48   switch (event_type)
  49     {
  50     case INF_ERROR:
  51       printf_unfiltered (_("error detected from target.\n"));
  52       target_async (NULL, 0);
  53       pop_target ();
  54       discard_all_continuations ();
  55       do_exec_error_cleanups (ALL_CLEANUPS);
  56       break;
  57
  58     case INF_REG_EVENT:
  59       /* Use catch errors for now, until the inner layers of
  60          fetch_inferior_event (i.e. readchar) can return meaningful
  61          error status.  If an error occurs while getting an event from
  62          the target, just get rid of the target. */
  63       if (!catch_errors (fetch_inferior_event_wrapper,
  64                          client_data, "", RETURN_MASK_ALL))
  65         {
  66           target_async (NULL, 0);
  67           pop_target ();
  68           discard_all_continuations ();
  69           do_exec_error_cleanups (ALL_CLEANUPS);
  70           display_gdb_prompt (0);
  71         }
  72       break;
  73
  74     case INF_EXEC_COMPLETE:
  75       /* Is there anything left to do for the command issued to
  76          complete? */
  77       do_all_continuations ();
  78       /* Reset things after target has stopped for the async commands. */
  79       complete_execution ();
  80       break;
  81
  82     case INF_EXEC_CONTINUE:
  83       /* Is there anything left to do for the command issued to
  84          complete? */
  85       do_all_intermediate_continuations ();
  86       break;
  87
  88     case INF_QUIT_REQ:
  89       /* FIXME: ezannoni 1999-10-04. This call should really be a
  90          target vector entry, so that it can be used for any kind of
  91          targets. */
  92       async_remote_interrupt_twice (NULL);
  93       break;
  94
  95     case INF_TIMER:
  96     default:
  97       printf_unfiltered (_("Event type not recognized.\n"));
  98       break;
  99     }
 100 }
 101
 102 static int
 103 fetch_inferior_event_wrapper (gdb_client_data client_data)
 104 {
 105   fetch_inferior_event (client_data);
 106   return 1;
 107 }
 108
 109 /* Reset proper settings after an asynchronous command has finished.
 110    If the execution command was in synchronous mode, register stdin
 111    with the event loop, and reset the prompt. */
 112
 113 static void
 114 complete_execution (void)
 115 {
 116   target_executing = 0;
 117
 118   /* Unregister the inferior from the event loop. This is done so that
 119      when the inferior is not running we don't get distracted by
 120      spurious inferior output. */
 121   target_async (NULL, 0);
 122
 123   if (sync_execution)
 124     {
 125       do_exec_error_cleanups (ALL_CLEANUPS);
 126       display_gdb_prompt (0);
 127     }
 128   else
 129     {
 130       if (exec_done_display_p)
 131         printf_unfiltered (_("completed.\n"));
 132     }
 133 }