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);
36 inferior_event_handler_wrapper (gdb_client_data client_data)
38 inferior_event_handler (INF_QUIT_REQ, client_data);
41 /* General function to handle events in the inferior. So far it just
42 takes care of detecting errors reported by select() or poll(),
43 otherwise it assumes that all is OK, and goes on reading data from
44 the fd. This however may not always be what we want to do. */
46 inferior_event_handler (enum inferior_event_type event_type,
47 gdb_client_data client_data)
49 struct gdb_exception e;
55 /* Use catch errors for now, until the inner layers of
56 fetch_inferior_event (i.e. readchar) can return meaningful
57 error status. If an error occurs while getting an event from
58 the target, just cancel the current command. */
59 if (!catch_errors (fetch_inferior_event_wrapper,
60 client_data, "", RETURN_MASK_ALL))
62 do_all_intermediate_continuations (1);
63 do_all_continuations (1);
64 async_enable_stdin ();
65 display_gdb_prompt (0);
69 case INF_EXEC_COMPLETE:
73 /* Unregister the inferior from the event loop. This is done
74 so that when the inferior is not running we don't get
75 distracted by spurious inferior output. */
76 if (target_has_execution)
77 target_async (NULL, 0);
80 /* The call to async_enable_stdin below resets 'sync_execution'.
81 However, if sync_execution is 1 now, we also need to show the
82 prompt below, so save the current value. */
83 was_sync = sync_execution;
84 async_enable_stdin ();
86 /* Do all continuations associated with the whole inferior (not
87 a particular thread). */
88 if (!ptid_equal (inferior_ptid, null_ptid))
89 do_all_inferior_continuations (0);
91 /* If we were doing a multi-step (eg: step n, next n), but it
92 got interrupted by a breakpoint, still do the pending
93 continuations. The continuation itself is responsible for
94 distinguishing the cases. The continuations are allowed to
95 touch the inferior memory, e.g. to remove breakpoints, so run
96 them before running breakpoint commands, which may resume the
99 && target_has_execution
100 && !ptid_equal (inferior_ptid, null_ptid))
101 do_all_intermediate_continuations_thread (inferior_thread (), 0);
103 do_all_intermediate_continuations (0);
105 /* Always finish the previous command before running any
106 breakpoint commands. Any stop cancels the previous command.
107 E.g. a "finish" or "step-n" command interrupted by an
108 unrelated breakpoint is canceled. */
110 && target_has_execution
111 && !ptid_equal (inferior_ptid, null_ptid))
112 do_all_continuations_thread (inferior_thread (), 0);
114 do_all_continuations (0);
117 && current_language != expected_language
118 && language_mode == language_mode_auto)
119 language_info (1); /* Print what changed. */
121 /* Don't propagate breakpoint commands errors. Either we're
122 stopping or some command resumes the inferior. The user will
124 TRY_CATCH (e, RETURN_MASK_ALL)
126 bpstat_do_actions ();
130 && exec_done_display_p
131 && (ptid_equal (inferior_ptid, null_ptid)
132 || !is_running (inferior_ptid)))
133 printf_unfiltered (_("completed.\n"));
136 case INF_EXEC_CONTINUE:
137 /* Is there anything left to do for the command issued to
141 do_all_intermediate_continuations_thread (inferior_thread (), 0);
143 do_all_intermediate_continuations (0);
147 /* FIXME: ezannoni 1999-10-04. This call should really be a
148 target vector entry, so that it can be used for any kind of
150 async_remote_interrupt_twice (NULL);
155 printf_unfiltered (_("Event type not recognized.\n"));
161 fetch_inferior_event_wrapper (gdb_client_data client_data)
163 fetch_inferior_event (client_data);