1 /* Handling of inferior events for the event loop for GDB, the GNU debugger.
2 Copyright (C) 1999, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "inferior.h" /* For fetch_inferior_event. */
23 #include "target.h" /* For enum inferior_event_type. */
24 #include "event-loop.h"
25 #include "event-top.h"
28 #include "exceptions.h"
30 #include "gdbthread.h"
31 #include "continuations.h"
33 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
35 /* General function to handle events in the inferior. So far it just
36 takes care of detecting errors reported by select() or poll(),
37 otherwise it assumes that all is OK, and goes on reading data from
38 the fd. This however may not always be what we want to do. */
40 inferior_event_handler (enum inferior_event_type event_type,
41 gdb_client_data client_data)
43 struct gdb_exception e;
45 struct cleanup *cleanup_if_error = make_bpstat_clear_actions_cleanup ();
50 /* Use catch errors for now, until the inner layers of
51 fetch_inferior_event (i.e. readchar) can return meaningful
52 error status. If an error occurs while getting an event from
53 the target, just cancel the current command. */
54 if (!catch_errors (fetch_inferior_event_wrapper,
55 client_data, "", RETURN_MASK_ALL))
57 bpstat_clear_actions ();
58 do_all_intermediate_continuations (1);
59 do_all_continuations (1);
60 async_enable_stdin ();
61 display_gdb_prompt (0);
65 case INF_EXEC_COMPLETE:
69 /* Unregister the inferior from the event loop. This is done
70 so that when the inferior is not running we don't get
71 distracted by spurious inferior output. */
72 if (target_has_execution)
73 target_async (NULL, 0);
76 /* The call to async_enable_stdin below resets 'sync_execution'.
77 However, if sync_execution is 1 now, we also need to show the
78 prompt below, so save the current value. */
79 was_sync = sync_execution;
80 async_enable_stdin ();
82 /* Do all continuations associated with the whole inferior (not
83 a particular thread). */
84 if (!ptid_equal (inferior_ptid, null_ptid))
85 do_all_inferior_continuations (0);
87 /* If we were doing a multi-step (eg: step n, next n), but it
88 got interrupted by a breakpoint, still do the pending
89 continuations. The continuation itself is responsible for
90 distinguishing the cases. The continuations are allowed to
91 touch the inferior memory, e.g. to remove breakpoints, so run
92 them before running breakpoint commands, which may resume the
95 && target_has_execution
96 && !ptid_equal (inferior_ptid, null_ptid))
97 do_all_intermediate_continuations_thread (inferior_thread (), 0);
99 do_all_intermediate_continuations (0);
101 /* Always finish the previous command before running any
102 breakpoint commands. Any stop cancels the previous command.
103 E.g. a "finish" or "step-n" command interrupted by an
104 unrelated breakpoint is canceled. */
106 && target_has_execution
107 && !ptid_equal (inferior_ptid, null_ptid))
108 do_all_continuations_thread (inferior_thread (), 0);
110 do_all_continuations (0);
113 && current_language != expected_language
114 && language_mode == language_mode_auto)
115 language_info (1); /* Print what changed. */
117 /* Don't propagate breakpoint commands errors. Either we're
118 stopping or some command resumes the inferior. The user will
120 TRY_CATCH (e, RETURN_MASK_ALL)
122 bpstat_do_actions ();
124 exception_print (gdb_stderr, e);
127 && exec_done_display_p
128 && (ptid_equal (inferior_ptid, null_ptid)
129 || !is_running (inferior_ptid)))
130 printf_unfiltered (_("completed.\n"));
133 case INF_EXEC_CONTINUE:
134 /* Is there anything left to do for the command issued to
138 do_all_intermediate_continuations_thread (inferior_thread (), 0);
140 do_all_intermediate_continuations (0);
145 printf_unfiltered (_("Event type not recognized.\n"));
149 discard_cleanups (cleanup_if_error);
153 fetch_inferior_event_wrapper (gdb_client_data client_data)
155 fetch_inferior_event (client_data);