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"
29 #include "gdbthread.h"
31 static int fetch_inferior_event_wrapper (gdb_client_data client_data);
34 inferior_event_handler_wrapper (gdb_client_data client_data)
36 inferior_event_handler (INF_QUIT_REQ, client_data);
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. */
44 inferior_event_handler (enum inferior_event_type event_type,
45 gdb_client_data client_data)
47 struct gdb_exception e;
52 printf_unfiltered (_("error detected from target.\n"));
53 target_async (NULL, 0);
55 do_all_continuations (1);
56 async_enable_stdin ();
60 /* Use catch errors for now, until the inner layers of
61 fetch_inferior_event (i.e. readchar) can return meaningful
62 error status. If an error occurs while getting an event from
63 the target, just get rid of the target. */
64 if (!catch_errors (fetch_inferior_event_wrapper,
65 client_data, "", RETURN_MASK_ALL))
67 target_async (NULL, 0);
69 do_all_continuations (1);
70 async_enable_stdin ();
71 display_gdb_prompt (0);
75 case INF_EXEC_COMPLETE:
76 /* Unregister the inferior from the event loop. This is done so that
77 when the inferior is not running we don't get distracted by
78 spurious inferior output. */
79 if (target_has_execution)
80 target_async (NULL, 0);
82 /* The call to async_enable_stdin below resets 'sync_execution'.
83 However, if sync_execution is 1 now, we also need to show the
84 prompt below, so save the current value. */
85 was_sync = sync_execution;
86 async_enable_stdin ();
88 /* If we were doing a multi-step (eg: step n, next n), but it
89 got interrupted by a breakpoint, still do the pending
90 continuations. The continuation itself is responsible for
91 distinguishing the cases. The continuations are allowed to
92 touch the inferior memory, e.g. to remove breakpoints, so run
93 them before running breakpoint commands, which may resume the
95 do_all_intermediate_continuations (0);
97 /* Always finish the previous command before running any
98 breakpoint commands. Any stop cancels the previous command.
99 E.g. a "finish" or "step-n" command interrupted by an
100 unrelated breakpoint is canceled. */
101 do_all_continuations (0);
103 if (current_language != expected_language
104 && language_mode == language_mode_auto)
105 language_info (1); /* Print what changed. */
107 /* Don't propagate breakpoint commands errors. Either we're
108 stopping or some command resumes the inferior. The user will
110 TRY_CATCH (e, RETURN_MASK_ALL)
112 bpstat_do_actions (&stop_bpstat);
115 /* If no breakpoint command resumed the inferior, prepare for
116 interaction with the user. */
117 if (!is_running (inferior_ptid))
121 display_gdb_prompt (0);
125 if (exec_done_display_p)
126 printf_unfiltered (_("completed.\n"));
131 case INF_EXEC_CONTINUE:
132 /* Is there anything left to do for the command issued to
134 do_all_intermediate_continuations (0);
138 /* FIXME: ezannoni 1999-10-04. This call should really be a
139 target vector entry, so that it can be used for any kind of
141 async_remote_interrupt_twice (NULL);
146 printf_unfiltered (_("Event type not recognized.\n"));
152 fetch_inferior_event_wrapper (gdb_client_data client_data)
154 fetch_inferior_event (client_data);