1 /* Multi-process control for GDB, the GNU debugger.
3 Copyright (C) 2008-2017 Free Software Foundation, Inc.
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/>. */
25 #include "completer.h"
27 #include "gdbthread.h"
33 #include "cli/cli-utils.h"
34 #include "continuations.h"
35 #include "arch-utils.h"
36 #include "target-descriptions.h"
37 #include "readline/tilde.h"
39 void _initialize_inferiors (void);
41 /* Keep a registry of per-inferior data-pointers required by other GDB
44 DEFINE_REGISTRY (inferior
, REGISTRY_ACCESS_FIELD
)
46 struct inferior
*inferior_list
= NULL
;
47 static int highest_inferior_num
;
49 /* Print notices on inferior events (attach, detach, etc.), set with
50 `set print inferior-events'. */
51 static int print_inferior_events
= 0;
53 /* The Current Inferior. */
54 static struct inferior
*current_inferior_
= NULL
;
57 current_inferior (void)
59 return current_inferior_
;
63 set_current_inferior (struct inferior
*inf
)
65 /* There's always an inferior. */
66 gdb_assert (inf
!= NULL
);
68 current_inferior_
= inf
;
71 /* A cleanups callback, helper for save_current_program_space
75 restore_inferior (void *arg
)
77 struct inferior
*saved_inferior
= (struct inferior
*) arg
;
79 set_current_inferior (saved_inferior
);
82 /* Save the current program space so that it may be restored by a later
83 call to do_cleanups. Returns the struct cleanup pointer needed for
84 later doing the cleanup. */
87 save_current_inferior (void)
89 struct cleanup
*old_chain
= make_cleanup (restore_inferior
,
96 free_inferior (struct inferior
*inf
)
98 discard_all_inferior_continuations (inf
);
99 inferior_free_data (inf
);
101 xfree (inf
->terminal
);
102 free_environ (inf
->environment
);
103 target_desc_info_free (inf
->tdesc_info
);
109 init_inferior_list (void)
111 struct inferior
*inf
, *infnext
;
113 highest_inferior_num
= 0;
117 for (inf
= inferior_list
; inf
; inf
= infnext
)
123 inferior_list
= NULL
;
127 add_inferior_silent (int pid
)
129 struct inferior
*inf
;
131 inf
= XNEW (struct inferior
);
132 memset (inf
, 0, sizeof (*inf
));
135 inf
->control
.stop_soon
= NO_STOP_QUIETLY
;
137 inf
->num
= ++highest_inferior_num
;
139 if (inferior_list
== NULL
)
143 struct inferior
*last
;
145 for (last
= inferior_list
; last
->next
!= NULL
; last
= last
->next
)
150 inf
->environment
= make_environ ();
151 init_environ (inf
->environment
);
153 inferior_alloc_data (inf
);
155 observer_notify_inferior_added (inf
);
158 inferior_appeared (inf
, pid
);
164 add_inferior (int pid
)
166 struct inferior
*inf
= add_inferior_silent (pid
);
168 if (print_inferior_events
)
169 printf_unfiltered (_("[New inferior %d]\n"), pid
);
174 struct delete_thread_of_inferior_arg
181 delete_thread_of_inferior (struct thread_info
*tp
, void *data
)
183 struct delete_thread_of_inferior_arg
*arg
184 = (struct delete_thread_of_inferior_arg
*) data
;
186 if (ptid_get_pid (tp
->ptid
) == arg
->pid
)
189 delete_thread_silent (tp
->ptid
);
191 delete_thread (tp
->ptid
);
198 delete_inferior (struct inferior
*todel
)
200 struct inferior
*inf
, *infprev
;
201 struct delete_thread_of_inferior_arg arg
;
205 for (inf
= inferior_list
; inf
; infprev
= inf
, inf
= inf
->next
)
215 iterate_over_threads (delete_thread_of_inferior
, &arg
);
218 infprev
->next
= inf
->next
;
220 inferior_list
= inf
->next
;
222 observer_notify_inferior_removed (inf
);
224 /* If this program space is rendered useless, remove it. */
225 if (program_space_empty_p (inf
->pspace
))
226 delete_program_space (inf
->pspace
);
231 /* If SILENT then be quiet -- don't announce a inferior exit, or the
232 exit of its threads. */
235 exit_inferior_1 (struct inferior
*inftoex
, int silent
)
237 struct inferior
*inf
;
238 struct delete_thread_of_inferior_arg arg
;
240 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
250 iterate_over_threads (delete_thread_of_inferior
, &arg
);
252 observer_notify_inferior_exit (inf
);
259 if (inf
->vfork_parent
!= NULL
)
261 inf
->vfork_parent
->vfork_child
= NULL
;
262 inf
->vfork_parent
= NULL
;
264 if (inf
->vfork_child
!= NULL
)
266 inf
->vfork_child
->vfork_parent
= NULL
;
267 inf
->vfork_child
= NULL
;
270 inf
->pending_detach
= 0;
274 exit_inferior (int pid
)
276 struct inferior
*inf
= find_inferior_pid (pid
);
278 exit_inferior_1 (inf
, 0);
280 if (print_inferior_events
)
281 printf_unfiltered (_("[Inferior %d exited]\n"), pid
);
285 exit_inferior_silent (int pid
)
287 struct inferior
*inf
= find_inferior_pid (pid
);
289 exit_inferior_1 (inf
, 1);
293 exit_inferior_num_silent (int num
)
295 struct inferior
*inf
= find_inferior_id (num
);
297 exit_inferior_1 (inf
, 1);
301 detach_inferior (int pid
)
303 struct inferior
*inf
= find_inferior_pid (pid
);
305 exit_inferior_1 (inf
, 0);
307 if (print_inferior_events
)
308 printf_unfiltered (_("[Inferior %d detached]\n"), pid
);
312 inferior_appeared (struct inferior
*inf
, int pid
)
315 inf
->has_exit_code
= 0;
318 observer_notify_inferior_appeared (inf
);
322 discard_all_inferiors (void)
324 struct inferior
*inf
;
326 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
329 exit_inferior_silent (inf
->pid
);
334 find_inferior_id (int num
)
336 struct inferior
*inf
;
338 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
346 find_inferior_pid (int pid
)
348 struct inferior
*inf
;
350 /* Looking for inferior pid == 0 is always wrong, and indicative of
351 a bug somewhere else. There may be more than one with pid == 0,
353 gdb_assert (pid
!= 0);
355 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
365 find_inferior_ptid (ptid_t ptid
)
367 return find_inferior_pid (ptid_get_pid (ptid
));
370 /* See inferior.h. */
373 find_inferior_for_program_space (struct program_space
*pspace
)
375 struct inferior
*inf
= current_inferior ();
377 if (inf
->pspace
== pspace
)
380 for (inf
= inferior_list
; inf
!= NULL
; inf
= inf
->next
)
382 if (inf
->pspace
== pspace
)
390 iterate_over_inferiors (int (*callback
) (struct inferior
*, void *),
393 struct inferior
*inf
, *infnext
;
395 for (inf
= inferior_list
; inf
; inf
= infnext
)
398 if ((*callback
) (inf
, data
))
406 valid_gdb_inferior_id (int num
)
408 struct inferior
*inf
;
410 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
418 pid_to_gdb_inferior_id (int pid
)
420 struct inferior
*inf
;
422 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
430 gdb_inferior_id_to_pid (int num
)
432 struct inferior
*inferior
= find_inferior_id (num
);
434 return inferior
->pid
;
440 in_inferior_list (int pid
)
442 struct inferior
*inf
;
444 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
452 have_inferiors (void)
454 struct inferior
*inf
;
456 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
463 /* Return the number of live inferiors. We account for the case
464 where an inferior might have a non-zero pid but no threads, as
465 in the middle of a 'mourn' operation. */
468 number_of_live_inferiors (void)
470 struct inferior
*inf
;
473 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
476 struct thread_info
*tp
;
478 ALL_NON_EXITED_THREADS (tp
)
479 if (tp
&& ptid_get_pid (tp
->ptid
) == inf
->pid
)
480 if (target_has_execution_1 (tp
->ptid
))
482 /* Found a live thread in this inferior, go to the next
492 /* Return true if there is at least one live inferior. */
495 have_live_inferiors (void)
497 return number_of_live_inferiors () > 0;
500 /* Prune away any unused inferiors, and then prune away no longer used
504 prune_inferiors (void)
506 struct inferior
*ss
, **ss_link
;
507 struct inferior
*current
= current_inferior ();
510 ss_link
= &inferior_list
;
523 delete_inferior (ss
);
528 /* Simply returns the count of inferiors. */
531 number_of_inferiors (void)
533 struct inferior
*inf
;
536 for (inf
= inferior_list
; inf
!= NULL
; inf
= inf
->next
)
542 /* Converts an inferior process id to a string. Like
543 target_pid_to_str, but special cases the null process. */
546 inferior_pid_to_str (int pid
)
549 return target_pid_to_str (pid_to_ptid (pid
));
554 /* See inferior.h. */
557 print_selected_inferior (struct ui_out
*uiout
)
559 struct inferior
*inf
= current_inferior ();
560 const char *filename
= inf
->pspace
->pspace_exec_filename
;
562 if (filename
== NULL
)
563 filename
= _("<noexec>");
565 uiout
->message (_("[Switching to inferior %d [%s] (%s)]\n"),
566 inf
->num
, inferior_pid_to_str (inf
->pid
), filename
);
569 /* Prints the list of inferiors and their details on UIOUT. This is a
570 version of 'info_inferior_command' suitable for use from MI.
572 If REQUESTED_INFERIORS is not NULL, it's a list of GDB ids of the
573 inferiors that should be printed. Otherwise, all inferiors are
577 print_inferior (struct ui_out
*uiout
, char *requested_inferiors
)
579 struct inferior
*inf
;
580 struct cleanup
*old_chain
;
583 /* Compute number of inferiors we will print. */
584 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
586 if (!number_is_in_list (requested_inferiors
, inf
->num
))
594 uiout
->message ("No inferiors.\n");
598 old_chain
= make_cleanup_ui_out_table_begin_end (uiout
, 4, inf_count
,
600 uiout
->table_header (1, ui_left
, "current", "");
601 uiout
->table_header (4, ui_left
, "number", "Num");
602 uiout
->table_header (17, ui_left
, "target-id", "Description");
603 uiout
->table_header (17, ui_left
, "exec", "Executable");
605 uiout
->table_body ();
606 for (inf
= inferior_list
; inf
; inf
= inf
->next
)
608 struct cleanup
*chain2
;
610 if (!number_is_in_list (requested_inferiors
, inf
->num
))
613 chain2
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
615 if (inf
== current_inferior ())
616 uiout
->field_string ("current", "*");
618 uiout
->field_skip ("current");
620 uiout
->field_int ("number", inf
->num
);
622 uiout
->field_string ("target-id", inferior_pid_to_str (inf
->pid
));
624 if (inf
->pspace
->pspace_exec_filename
!= NULL
)
625 uiout
->field_string ("exec", inf
->pspace
->pspace_exec_filename
);
627 uiout
->field_skip ("exec");
629 /* Print extra info that isn't really fit to always present in
630 tabular form. Currently we print the vfork parent/child
631 relationships, if any. */
632 if (inf
->vfork_parent
)
634 uiout
->text (_("\n\tis vfork child of inferior "));
635 uiout
->field_int ("vfork-parent", inf
->vfork_parent
->num
);
637 if (inf
->vfork_child
)
639 uiout
->text (_("\n\tis vfork parent of inferior "));
640 uiout
->field_int ("vfork-child", inf
->vfork_child
->num
);
644 do_cleanups (chain2
);
647 do_cleanups (old_chain
);
651 detach_inferior_command (char *args
, int from_tty
)
653 struct thread_info
*tp
;
656 error (_("Requires argument (inferior id(s) to detach)"));
658 number_or_range_parser
parser (args
);
659 while (!parser
.finished ())
661 int num
= parser
.get_number ();
663 if (!valid_gdb_inferior_id (num
))
665 warning (_("Inferior ID %d not known."), num
);
669 int pid
= gdb_inferior_id_to_pid (num
);
672 warning (_("Inferior ID %d is not running."), num
);
676 tp
= any_thread_of_process (pid
);
679 warning (_("Inferior ID %d has no threads."), num
);
683 switch_to_thread (tp
->ptid
);
685 detach_command (NULL
, from_tty
);
690 kill_inferior_command (char *args
, int from_tty
)
692 struct thread_info
*tp
;
695 error (_("Requires argument (inferior id(s) to kill)"));
697 number_or_range_parser
parser (args
);
698 while (!parser
.finished ())
700 int num
= parser
.get_number ();
702 if (!valid_gdb_inferior_id (num
))
704 warning (_("Inferior ID %d not known."), num
);
708 int pid
= gdb_inferior_id_to_pid (num
);
711 warning (_("Inferior ID %d is not running."), num
);
715 tp
= any_thread_of_process (pid
);
718 warning (_("Inferior ID %d has no threads."), num
);
722 switch_to_thread (tp
->ptid
);
727 bfd_cache_close_all ();
731 inferior_command (char *args
, int from_tty
)
733 struct inferior
*inf
;
736 num
= parse_and_eval_long (args
);
738 inf
= find_inferior_id (num
);
740 error (_("Inferior ID %d not known."), num
);
744 if (inf
->pid
!= ptid_get_pid (inferior_ptid
))
746 struct thread_info
*tp
;
748 tp
= any_thread_of_process (inf
->pid
);
750 error (_("Inferior has no threads."));
752 switch_to_thread (tp
->ptid
);
755 observer_notify_user_selected_context_changed
756 (USER_SELECTED_INFERIOR
757 | USER_SELECTED_THREAD
758 | USER_SELECTED_FRAME
);
762 set_current_inferior (inf
);
763 switch_to_thread (null_ptid
);
764 set_current_program_space (inf
->pspace
);
766 observer_notify_user_selected_context_changed (USER_SELECTED_INFERIOR
);
770 /* Print information about currently known inferiors. */
773 info_inferiors_command (char *args
, int from_tty
)
775 print_inferior (current_uiout
, args
);
778 /* remove-inferior ID */
781 remove_inferior_command (char *args
, int from_tty
)
783 if (args
== NULL
|| *args
== '\0')
784 error (_("Requires an argument (inferior id(s) to remove)"));
786 number_or_range_parser
parser (args
);
787 while (!parser
.finished ())
789 int num
= parser
.get_number ();
790 struct inferior
*inf
= find_inferior_id (num
);
794 warning (_("Inferior ID %d not known."), num
);
798 if (inf
== current_inferior ())
800 warning (_("Can not remove current inferior %d."), num
);
806 warning (_("Can not remove active inferior %d."), num
);
810 delete_inferior (inf
);
815 add_inferior_with_spaces (void)
817 struct address_space
*aspace
;
818 struct program_space
*pspace
;
819 struct inferior
*inf
;
820 struct gdbarch_info info
;
822 /* If all inferiors share an address space on this system, this
823 doesn't really return a new address space; otherwise, it
825 aspace
= maybe_new_address_space ();
826 pspace
= add_program_space (aspace
);
827 inf
= add_inferior (0);
828 inf
->pspace
= pspace
;
829 inf
->aspace
= pspace
->aspace
;
831 /* Setup the inferior's initial arch, based on information obtained
832 from the global "set ..." options. */
833 gdbarch_info_init (&info
);
834 inf
->gdbarch
= gdbarch_find_by_info (info
);
835 /* The "set ..." options reject invalid settings, so we should
836 always have a valid arch by now. */
837 gdb_assert (inf
->gdbarch
!= NULL
);
842 /* add-inferior [-copies N] [-exec FILENAME] */
845 add_inferior_command (char *args
, int from_tty
)
850 symfile_add_flags add_flags
= 0;
851 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
854 add_flags
|= SYMFILE_VERBOSE
;
858 argv
= gdb_buildargv (args
);
859 make_cleanup_freeargv (argv
);
861 for (; *argv
!= NULL
; argv
++)
865 if (strcmp (*argv
, "-copies") == 0)
869 error (_("No argument to -copies"));
870 copies
= parse_and_eval_long (*argv
);
872 else if (strcmp (*argv
, "-exec") == 0)
876 error (_("No argument to -exec"));
877 exec
= tilde_expand (*argv
);
878 make_cleanup (xfree
, exec
);
882 error (_("Invalid argument"));
886 save_current_space_and_thread ();
888 for (i
= 0; i
< copies
; ++i
)
890 struct inferior
*inf
= add_inferior_with_spaces ();
892 printf_filtered (_("Added inferior %d\n"), inf
->num
);
896 /* Switch over temporarily, while reading executable and
898 set_current_program_space (inf
->pspace
);
899 set_current_inferior (inf
);
900 switch_to_thread (null_ptid
);
902 exec_file_attach (exec
, from_tty
);
903 symbol_file_add_main (exec
, add_flags
);
907 do_cleanups (old_chain
);
910 /* clone-inferior [-copies N] [ID] */
913 clone_inferior_command (char *args
, int from_tty
)
917 struct inferior
*orginf
= NULL
;
918 struct cleanup
*old_chain
= make_cleanup (null_cleanup
, NULL
);
922 argv
= gdb_buildargv (args
);
923 make_cleanup_freeargv (argv
);
925 for (; *argv
!= NULL
; argv
++)
929 if (strcmp (*argv
, "-copies") == 0)
933 error (_("No argument to -copies"));
934 copies
= parse_and_eval_long (*argv
);
937 error (_("Invalid copies number"));
946 /* The first non-option (-) argument specified the
948 num
= parse_and_eval_long (*argv
);
949 orginf
= find_inferior_id (num
);
952 error (_("Inferior ID %d not known."), num
);
956 error (_("Invalid argument"));
961 /* If no inferior id was specified, then the user wants to clone the
964 orginf
= current_inferior ();
966 save_current_space_and_thread ();
968 for (i
= 0; i
< copies
; ++i
)
970 struct address_space
*aspace
;
971 struct program_space
*pspace
;
972 struct inferior
*inf
;
974 /* If all inferiors share an address space on this system, this
975 doesn't really return a new address space; otherwise, it
977 aspace
= maybe_new_address_space ();
978 pspace
= add_program_space (aspace
);
979 inf
= add_inferior (0);
980 inf
->pspace
= pspace
;
981 inf
->aspace
= pspace
->aspace
;
982 inf
->gdbarch
= orginf
->gdbarch
;
984 /* If the original inferior had a user specified target
985 description, make the clone use it too. */
986 if (target_desc_info_from_user_p (inf
->tdesc_info
))
987 copy_inferior_target_desc_info (inf
, orginf
);
989 printf_filtered (_("Added inferior %d.\n"), inf
->num
);
991 set_current_inferior (inf
);
992 switch_to_thread (null_ptid
);
993 clone_program_space (pspace
, orginf
->pspace
);
996 do_cleanups (old_chain
);
999 /* Print notices when new inferiors are created and die. */
1001 show_print_inferior_events (struct ui_file
*file
, int from_tty
,
1002 struct cmd_list_element
*c
, const char *value
)
1004 fprintf_filtered (file
, _("Printing of inferior events is %s.\n"), value
);
1007 /* Return a new value for the selected inferior's id. */
1009 static struct value
*
1010 inferior_id_make_value (struct gdbarch
*gdbarch
, struct internalvar
*var
,
1013 struct inferior
*inf
= current_inferior ();
1015 return value_from_longest (builtin_type (gdbarch
)->builtin_int
, inf
->num
);
1018 /* Implementation of `$_inferior' variable. */
1020 static const struct internalvar_funcs inferior_funcs
=
1022 inferior_id_make_value
,
1030 initialize_inferiors (void)
1032 struct cmd_list_element
*c
= NULL
;
1034 /* There's always one inferior. Note that this function isn't an
1035 automatic _initialize_foo function, since other _initialize_foo
1036 routines may need to install their per-inferior data keys. We
1037 can only allocate an inferior when all those modules have done
1038 that. Do this after initialize_progspace, due to the
1039 current_program_space reference. */
1040 current_inferior_
= add_inferior (0);
1041 current_inferior_
->pspace
= current_program_space
;
1042 current_inferior_
->aspace
= current_program_space
->aspace
;
1043 /* The architecture will be initialized shortly, by
1044 initialize_current_architecture. */
1046 add_info ("inferiors", info_inferiors_command
,
1047 _("IDs of specified inferiors (all inferiors if no argument)."));
1049 c
= add_com ("add-inferior", no_class
, add_inferior_command
, _("\
1050 Add a new inferior.\n\
1051 Usage: add-inferior [-copies <N>] [-exec <FILENAME>]\n\
1052 N is the optional number of inferiors to add, default is 1.\n\
1053 FILENAME is the file name of the executable to use\n\
1054 as main program."));
1055 set_cmd_completer (c
, filename_completer
);
1057 add_com ("remove-inferiors", no_class
, remove_inferior_command
, _("\
1058 Remove inferior ID (or list of IDs).\n\
1059 Usage: remove-inferiors ID..."));
1061 add_com ("clone-inferior", no_class
, clone_inferior_command
, _("\
1062 Clone inferior ID.\n\
1063 Usage: clone-inferior [-copies <N>] [ID]\n\
1064 Add N copies of inferior ID. The new inferior has the same\n\
1065 executable loaded as the copied inferior. If -copies is not specified,\n\
1066 adds 1 copy. If ID is not specified, it is the current inferior\n\
1069 add_cmd ("inferiors", class_run
, detach_inferior_command
, _("\
1070 Detach from inferior ID (or list of IDS)."),
1073 add_cmd ("inferiors", class_run
, kill_inferior_command
, _("\
1074 Kill inferior ID (or list of IDs)."),
1077 add_cmd ("inferior", class_run
, inferior_command
, _("\
1078 Use this command to switch between inferiors.\n\
1079 The new inferior ID must be currently known."),
1082 add_setshow_boolean_cmd ("inferior-events", no_class
,
1083 &print_inferior_events
, _("\
1084 Set printing of inferior events (e.g., inferior start and exit)."), _("\
1085 Show printing of inferior events (e.g., inferior start and exit)."), NULL
,
1087 show_print_inferior_events
,
1088 &setprintlist
, &showprintlist
);
1090 create_internalvar_type_lazy ("_inferior", &inferior_funcs
, NULL
);