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
)
46 struct gdb_exception e
;
51 printf_unfiltered (_("error detected from target.\n"));
52 target_async (NULL
, 0);
54 do_all_continuations (1);
55 async_enable_stdin ();
59 /* Use catch errors for now, until the inner layers of
60 fetch_inferior_event (i.e. readchar) can return meaningful
61 error status. If an error occurs while getting an event from
62 the target, just get rid of the target. */
63 if (!catch_errors (fetch_inferior_event_wrapper
,
64 client_data
, "", RETURN_MASK_ALL
))
66 target_async (NULL
, 0);
68 do_all_continuations (1);
69 async_enable_stdin ();
70 display_gdb_prompt (0);
74 case INF_EXEC_COMPLETE
:
76 /* This is the first thing to do -- so that continuations know that
77 the target is stopped. For example, command_line_handler_continuation
78 will run breakpoint commands, and if we think that the target is
79 running, we'll refuse to execute most commands. MI continuation
80 presently uses target_executing to either print or not print *stopped. */
83 /* Unregister the inferior from the event loop. This is done so that
84 when the inferior is not running we don't get distracted by
85 spurious inferior output. */
86 if (target_has_execution
)
87 target_async (NULL
, 0);
89 /* The call to async_enable_stdin below resets 'sync_execution'.
90 However, if sync_execution is 1 now, we also need to show the
91 prompt below, so save the current value. */
92 was_sync
= sync_execution
;
93 async_enable_stdin ();
95 /* If we were doing a multi-step (eg: step n, next n), but it
96 got interrupted by a breakpoint, still do the pending
97 continuations. The continuation itself is responsible for
98 distinguishing the cases. The continuations are allowed to
99 touch the inferior memory, e.g. to remove breakpoints, so run
100 them before running breakpoint commands, which may resume the
102 do_all_intermediate_continuations (0);
104 /* Always finish the previous command before running any
105 breakpoint commands. Any stop cancels the previous command.
106 E.g. a "finish" or "step-n" command interrupted by an
107 unrelated breakpoint is canceled. */
108 do_all_continuations (0);
110 if (current_language
!= expected_language
111 && language_mode
== language_mode_auto
)
112 language_info (1); /* Print what changed. */
114 /* Don't propagate breakpoint commands errors. Either we're
115 stopping or some command resumes the inferior. The user will
117 TRY_CATCH (e
, RETURN_MASK_ALL
)
119 bpstat_do_actions (&stop_bpstat
);
122 /* If no breakpoint command resumed the inferior, prepare for
123 interaction with the user. */
124 if (!target_executing
)
128 display_gdb_prompt (0);
132 if (exec_done_display_p
)
133 printf_unfiltered (_("completed.\n"));
138 case INF_EXEC_CONTINUE
:
139 /* Is there anything left to do for the command issued to
141 do_all_intermediate_continuations (0);
145 /* FIXME: ezannoni 1999-10-04. This call should really be a
146 target vector entry, so that it can be used for any kind of
148 async_remote_interrupt_twice (NULL
);
153 printf_unfiltered (_("Event type not recognized.\n"));
159 fetch_inferior_event_wrapper (gdb_client_data client_data
)
161 fetch_inferior_event (client_data
);