1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
2 Copyright (C) 1999, 2007, 2008 Free Software Foundation, Inc.
3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
5 This file is part of GDB.
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 3 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "inferior.h" /* For fetch_inferior_event. */
22 #include "target.h" /* For enum inferior_event_type. */
23 #include "event-loop.h"
24 #include "event-top.h"
27 #include "exceptions.h"
30 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
33 inferior_event_handler_wrapper (gdb_client_data client_data)
35 inferior_event_handler (INF_QUIT_REQ, client_data);
38 /* General function to handle events in the inferior. So far it just
39 takes care of detecting errors reported by select() or poll(),
40 otherwise it assumes that all is OK, and goes on reading data from
41 the fd. This however may not always be what we want to do. */
43 inferior_event_handler (enum inferior_event_type event_type,
44 gdb_client_data client_data)
50 printf_unfiltered (_("error detected from target.\n"));
51 target_async (NULL, 0);
53 discard_all_continuations ();
54 async_enable_stdin ();
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))
65 target_async (NULL, 0);
67 discard_all_continuations ();
68 async_enable_stdin ();
69 display_gdb_prompt (0);
73 case INF_EXEC_COMPLETE:
75 /* This is the first thing to do -- so that continuations know that
76 the target is stopped. For example, command_line_handler_continuation
77 will run breakpoint commands, and if we think that the target is
78 running, we'll refuse to execute most commands. MI continuation
79 presently uses target_executing to either print or not print *stopped. */
82 /* Unregister the inferior from the event loop. This is done so that
83 when the inferior is not running we don't get distracted by
84 spurious inferior output. */
85 if (target_has_execution)
86 target_async (NULL, 0);
88 /* The call to async_enable_stdin below resets 'sync_execution'.
89 However, if sync_execution is 1 now, we also need to show the
90 prompt below, so save the current value. */
91 was_sync = sync_execution;
92 async_enable_stdin ();
94 /* If we were doing a multi-step (eg: step n, next n), but it
95 got interrupted by a breakpoint, still do the pending
96 continuations. The continuation itself is responsible for
97 distinguishing the cases. */
98 do_all_intermediate_continuations ();
100 do_all_continuations ();
102 if (current_language != expected_language)
104 if (language_mode == language_mode_auto)
106 language_info (1); /* Print what changed. */
110 /* If the continuation did not start the target again,
111 prepare for interation with the user. */
112 if (!target_executing)
116 display_gdb_prompt (0);
120 if (exec_done_display_p)
121 printf_unfiltered (_("completed.\n"));
126 case INF_EXEC_CONTINUE:
127 /* Is there anything left to do for the command issued to
129 do_all_intermediate_continuations ();
133 /* FIXME: ezannoni 1999-10-04. This call should really be a
134 target vector entry, so that it can be used for any kind of
136 async_remote_interrupt_twice (NULL);
141 printf_unfiltered (_("Event type not recognized.\n"));
147 fetch_inferior_event_wrapper (gdb_client_data client_data)
149 fetch_inferior_event (client_data);