gdb/inf-loop.c

   1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
   2    Copyright 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., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, 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
  30 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
  31 static void complete_execution (void);
  32
  33 void
  34 inferior_event_handler_wrapper (gdb_client_data client_data)
  35 {
  36   inferior_event_handler (INF_QUIT_REQ, client_data);
  37 }
  38
  39 /* General function to handle events in the inferior. So far it just
  40    takes care of detecting errors reported by select() or poll(),
  41    otherwise it assumes that all is OK, and goes on reading data from
  42    the fd. This however may not always be what we want to do. */
  43 void
  44 inferior_event_handler (enum inferior_event_type event_type,
  45                         gdb_client_data client_data)
  46 {
  47   switch (event_type)
  48     {
  49     case INF_ERROR:
  50       printf_unfiltered ("error detected from target.\n");
  51       target_async (NULL, 0);
  52       pop_target ();
  53       discard_all_continuations ();
  54       do_exec_error_cleanups (ALL_CLEANUPS);
  55       break;
  56
  57     case INF_REG_EVENT:
  58       /* Use catch errors for now, until the inner layers of
  59          fetch_inferior_event (i.e. readchar) can return meaningful
  60          error status.  If an error occurs while getting an event from
  61          the target, just get rid of the target. */
  62       if (!catch_errors (fetch_inferior_event_wrapper,
  63                          client_data, "", RETURN_MASK_ALL))
  64         {
  65           target_async (NULL, 0);
  66           pop_target ();
  67           discard_all_continuations ();
  68           do_exec_error_cleanups (ALL_CLEANUPS);
  69           display_gdb_prompt (0);
  70         }
  71       break;
  72
  73     case INF_EXEC_COMPLETE:
  74       /* Is there anything left to do for the command issued to
  75          complete? */
  76       do_all_continuations ();
  77       /* Reset things after target has stopped for the async commands. */
  78       complete_execution ();
  79       break;
  80
  81     case INF_EXEC_CONTINUE:
  82       /* Is there anything left to do for the command issued to
  83          complete? */
  84       do_all_intermediate_continuations ();
  85       break;
  86
  87     case INF_QUIT_REQ:
  88       /* FIXME: ezannoni 1999-10-04. This call should really be a
  89          target vector entry, so that it can be used for any kind of
  90          targets. */
  91       async_remote_interrupt_twice (NULL);
  92       break;
  93
  94     case INF_TIMER:
  95     default:
  96       printf_unfiltered ("Event type not recognized.\n");
  97       break;
  98     }
  99 }
 100
 101 static int
 102 fetch_inferior_event_wrapper (gdb_client_data client_data)
 103 {
 104   fetch_inferior_event (client_data);
 105   return 1;
 106 }
 107
 108 /* Reset proper settings after an asynchronous command has finished.
 109    If the execution command was in synchronous mode, register stdin
 110    with the event loop, and reset the prompt. */
 111
 112 static void
 113 complete_execution (void)
 114 {
 115   target_executing = 0;
 116
 117   /* Unregister the inferior from the event loop. This is done so that
 118      when the inferior is not running we don't get distracted by
 119      spurious inferior output. */
 120   target_async (NULL, 0);
 121
 122   if (sync_execution)
 123     {
 124       do_exec_error_cleanups (ALL_CLEANUPS);
 125       display_gdb_prompt (0);
 126     }
 127   else
 128     {
 129       if (exec_done_display_p)
 130         printf_unfiltered ("completed.\n");
 131     }
 132 }