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"
35 static int fetch_inferior_event_wrapper (gdb_client_data client_data
);
37 /* General function to handle events in the inferior. So far it just
38 takes care of detecting errors reported by select() or poll(),
39 otherwise it assumes that all is OK, and goes on reading data from
40 the fd. This however may not always be what we want to do. */
42 inferior_event_handler (enum inferior_event_type event_type
,
43 gdb_client_data client_data
)
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
:
68 /* Unregister the inferior from the event loop. This is done
69 so that when the inferior is not running we don't get
70 distracted by spurious inferior output. */
71 if (target_has_execution
)
72 target_async (NULL
, 0);
75 /* Do all continuations associated with the whole inferior (not
76 a particular thread). */
77 if (!ptid_equal (inferior_ptid
, null_ptid
))
78 do_all_inferior_continuations (0);
80 /* If we were doing a multi-step (eg: step n, next n), but it
81 got interrupted by a breakpoint, still do the pending
82 continuations. The continuation itself is responsible for
83 distinguishing the cases. The continuations are allowed to
84 touch the inferior memory, e.g. to remove breakpoints, so run
85 them before running breakpoint commands, which may resume the
88 && target_has_execution
89 && !ptid_equal (inferior_ptid
, null_ptid
))
90 do_all_intermediate_continuations_thread (inferior_thread (), 0);
92 do_all_intermediate_continuations (0);
94 /* Always finish the previous command before running any
95 breakpoint commands. Any stop cancels the previous command.
96 E.g. a "finish" or "step-n" command interrupted by an
97 unrelated breakpoint is canceled. */
99 && target_has_execution
100 && !ptid_equal (inferior_ptid
, null_ptid
))
101 do_all_continuations_thread (inferior_thread (), 0);
103 do_all_continuations (0);
105 /* When running a command list (from a user command, say), these
106 are only run when the command list is all done. */
107 if (interpreter_async
)
109 volatile struct gdb_exception e
;
111 check_frame_language_change ();
113 /* Don't propagate breakpoint commands errors. Either we're
114 stopping or some command resumes the inferior. The user will
116 TRY_CATCH (e
, RETURN_MASK_ALL
)
118 bpstat_do_actions ();
120 exception_print (gdb_stderr
, e
);
124 case INF_EXEC_CONTINUE
:
125 /* Is there anything left to do for the command issued to
129 do_all_intermediate_continuations_thread (inferior_thread (), 0);
131 do_all_intermediate_continuations (0);
136 printf_unfiltered (_("Event type not recognized.\n"));
140 discard_cleanups (cleanup_if_error
);
144 fetch_inferior_event_wrapper (gdb_client_data client_data
)
146 fetch_inferior_event (client_data
);