gdb/inferior.c

   1 /* Multi-process control for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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/>.  */
  19
  20 #include "defs.h"
  21 #include "exec.h"
  22 #include "inferior.h"
  23 #include "target.h"
  24 #include "command.h"
  25 #include "completer.h"
  26 #include "gdbcmd.h"
  27 #include "gdbthread.h"
  28 #include "ui-out.h"
  29 #include "observer.h"
  30 #include "gdbcore.h"
  31 #include "symfile.h"
  32 #include "environ.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"
  38
  39 void _initialize_inferiors (void);
  40
  41 /* Keep a registry of per-inferior data-pointers required by other GDB
  42    modules.  */
  43
  44 DEFINE_REGISTRY (inferior, REGISTRY_ACCESS_FIELD)
  45
  46 struct inferior *inferior_list = NULL;
  47 static int highest_inferior_num;
  48
  49 /* Print notices on inferior events (attach, detach, etc.), set with
  50    `set print inferior-events'.  */
  51 static int print_inferior_events = 0;
  52
  53 /* The Current Inferior.  */
  54 static struct inferior *current_inferior_ = NULL;
  55
  56 struct inferior*
  57 current_inferior (void)
  58 {
  59   return current_inferior_;
  60 }
  61
  62 void
  63 set_current_inferior (struct inferior *inf)
  64 {
  65   /* There's always an inferior.  */
  66   gdb_assert (inf != NULL);
  67
  68   current_inferior_ = inf;
  69 }
  70
  71 /* A cleanups callback, helper for save_current_program_space
  72    below.  */
  73
  74 static void
  75 restore_inferior (void *arg)
  76 {
  77   struct inferior *saved_inferior = (struct inferior *) arg;
  78
  79   set_current_inferior (saved_inferior);
  80 }
  81
  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.  */
  85
  86 struct cleanup *
  87 save_current_inferior (void)
  88 {
  89   struct cleanup *old_chain = make_cleanup (restore_inferior,
  90                                             current_inferior_);
  91
  92   return old_chain;
  93 }
  94
  95 static void
  96 free_inferior (struct inferior *inf)
  97 {
  98   discard_all_inferior_continuations (inf);
  99   inferior_free_data (inf);
 100   xfree (inf->args);
 101   xfree (inf->terminal);
 102   free_environ (inf->environment);
 103   target_desc_info_free (inf->tdesc_info);
 104   xfree (inf->priv);
 105   xfree (inf);
 106 }
 107
 108 void
 109 init_inferior_list (void)
 110 {
 111   struct inferior *inf, *infnext;
 112
 113   highest_inferior_num = 0;
 114   if (!inferior_list)
 115     return;
 116
 117   for (inf = inferior_list; inf; inf = infnext)
 118     {
 119       infnext = inf->next;
 120       free_inferior (inf);
 121     }
 122
 123   inferior_list = NULL;
 124 }
 125
 126 struct inferior *
 127 add_inferior_silent (int pid)
 128 {
 129   struct inferior *inf;
 130
 131   inf = XNEW (struct inferior);
 132   memset (inf, 0, sizeof (*inf));
 133   inf->pid = pid;
 134
 135   inf->control.stop_soon = NO_STOP_QUIETLY;
 136
 137   inf->num = ++highest_inferior_num;
 138   inf->next = inferior_list;
 139   inferior_list = inf;
 140
 141   inf->environment = make_environ ();
 142   init_environ (inf->environment);
 143
 144   inferior_alloc_data (inf);
 145
 146   observer_notify_inferior_added (inf);
 147
 148   if (pid != 0)
 149     inferior_appeared (inf, pid);
 150
 151   return inf;
 152 }
 153
 154 struct inferior *
 155 add_inferior (int pid)
 156 {
 157   struct inferior *inf = add_inferior_silent (pid);
 158
 159   if (print_inferior_events)
 160     printf_unfiltered (_("[New inferior %d]\n"), pid);
 161
 162   return inf;
 163 }
 164
 165 struct delete_thread_of_inferior_arg
 166 {
 167   int pid;
 168   int silent;
 169 };
 170
 171 static int
 172 delete_thread_of_inferior (struct thread_info *tp, void *data)
 173 {
 174   struct delete_thread_of_inferior_arg *arg
 175     = (struct delete_thread_of_inferior_arg *) data;
 176
 177   if (ptid_get_pid (tp->ptid) == arg->pid)
 178     {
 179       if (arg->silent)
 180         delete_thread_silent (tp->ptid);
 181       else
 182         delete_thread (tp->ptid);
 183     }
 184
 185   return 0;
 186 }
 187
 188 void
 189 delete_inferior (struct inferior *todel)
 190 {
 191   struct inferior *inf, *infprev;
 192   struct delete_thread_of_inferior_arg arg;
 193
 194   infprev = NULL;
 195
 196   for (inf = inferior_list; inf; infprev = inf, inf = inf->next)
 197     if (inf == todel)
 198       break;
 199
 200   if (!inf)
 201     return;
 202
 203   arg.pid = inf->pid;
 204   arg.silent = 1;
 205
 206   iterate_over_threads (delete_thread_of_inferior, &arg);
 207
 208   if (infprev)
 209     infprev->next = inf->next;
 210   else
 211     inferior_list = inf->next;
 212
 213   observer_notify_inferior_removed (inf);
 214
 215   /* If this program space is rendered useless, remove it. */
 216   if (program_space_empty_p (inf->pspace))
 217     delete_program_space (inf->pspace);
 218
 219   free_inferior (inf);
 220 }
 221
 222 /* If SILENT then be quiet -- don't announce a inferior exit, or the
 223    exit of its threads.  */
 224
 225 static void
 226 exit_inferior_1 (struct inferior *inftoex, int silent)
 227 {
 228   struct inferior *inf;
 229   struct delete_thread_of_inferior_arg arg;
 230
 231   for (inf = inferior_list; inf; inf = inf->next)
 232     if (inf == inftoex)
 233       break;
 234
 235   if (!inf)
 236     return;
 237
 238   arg.pid = inf->pid;
 239   arg.silent = silent;
 240
 241   iterate_over_threads (delete_thread_of_inferior, &arg);
 242
 243   /* Notify the observers before removing the inferior from the list,
 244      so that the observers have a chance to look it up.  */
 245   observer_notify_inferior_exit (inf);
 246
 247   inf->pid = 0;
 248   inf->fake_pid_p = 0;
 249   if (inf->vfork_parent != NULL)
 250     {
 251       inf->vfork_parent->vfork_child = NULL;
 252       inf->vfork_parent = NULL;
 253     }
 254   if (inf->vfork_child != NULL)
 255     {
 256       inf->vfork_child->vfork_parent = NULL;
 257       inf->vfork_child = NULL;
 258     }
 259
 260   inf->pending_detach = 0;
 261 }
 262
 263 void
 264 exit_inferior (int pid)
 265 {
 266   struct inferior *inf = find_inferior_pid (pid);
 267
 268   exit_inferior_1 (inf, 0);
 269
 270   if (print_inferior_events)
 271     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 272 }
 273
 274 void
 275 exit_inferior_silent (int pid)
 276 {
 277   struct inferior *inf = find_inferior_pid (pid);
 278
 279   exit_inferior_1 (inf, 1);
 280 }
 281
 282 void
 283 exit_inferior_num_silent (int num)
 284 {
 285   struct inferior *inf = find_inferior_id (num);
 286
 287   exit_inferior_1 (inf, 1);
 288 }
 289
 290 void
 291 detach_inferior (int pid)
 292 {
 293   struct inferior *inf = find_inferior_pid (pid);
 294
 295   exit_inferior_1 (inf, 0);
 296
 297   if (print_inferior_events)
 298     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
 299 }
 300
 301 void
 302 inferior_appeared (struct inferior *inf, int pid)
 303 {
 304   inf->pid = pid;
 305   inf->has_exit_code = 0;
 306   inf->exit_code = 0;
 307
 308   observer_notify_inferior_appeared (inf);
 309 }
 310
 311 void
 312 discard_all_inferiors (void)
 313 {
 314   struct inferior *inf;
 315
 316   for (inf = inferior_list; inf; inf = inf->next)
 317     {
 318       if (inf->pid != 0)
 319         exit_inferior_silent (inf->pid);
 320     }
 321 }
 322
 323 struct inferior *
 324 find_inferior_id (int num)
 325 {
 326   struct inferior *inf;
 327
 328   for (inf = inferior_list; inf; inf = inf->next)
 329     if (inf->num == num)
 330       return inf;
 331
 332   return NULL;
 333 }
 334
 335 struct inferior *
 336 find_inferior_pid (int pid)
 337 {
 338   struct inferior *inf;
 339
 340   /* Looking for inferior pid == 0 is always wrong, and indicative of
 341      a bug somewhere else.  There may be more than one with pid == 0,
 342      for instance.  */
 343   gdb_assert (pid != 0);
 344
 345   for (inf = inferior_list; inf; inf = inf->next)
 346     if (inf->pid == pid)
 347       return inf;
 348
 349   return NULL;
 350 }
 351
 352 /* See inferior.h */
 353
 354 struct inferior *
 355 find_inferior_ptid (ptid_t ptid)
 356 {
 357   return find_inferior_pid (ptid_get_pid (ptid));
 358 }
 359
 360 /* See inferior.h.  */
 361
 362 struct inferior *
 363 find_inferior_for_program_space (struct program_space *pspace)
 364 {
 365   struct inferior *inf = current_inferior ();
 366
 367   if (inf->pspace == pspace)
 368     return inf;
 369
 370   for (inf = inferior_list; inf != NULL; inf = inf->next)
 371     {
 372       if (inf->pspace == pspace)
 373         return inf;
 374     }
 375
 376   return NULL;
 377 }
 378
 379 struct inferior *
 380 iterate_over_inferiors (int (*callback) (struct inferior *, void *),
 381                         void *data)
 382 {
 383   struct inferior *inf, *infnext;
 384
 385   for (inf = inferior_list; inf; inf = infnext)
 386     {
 387       infnext = inf->next;
 388       if ((*callback) (inf, data))
 389         return inf;
 390     }
 391
 392   return NULL;
 393 }
 394
 395 int
 396 valid_gdb_inferior_id (int num)
 397 {
 398   struct inferior *inf;
 399
 400   for (inf = inferior_list; inf; inf = inf->next)
 401     if (inf->num == num)
 402       return 1;
 403
 404   return 0;
 405 }
 406
 407 int
 408 pid_to_gdb_inferior_id (int pid)
 409 {
 410   struct inferior *inf;
 411
 412   for (inf = inferior_list; inf; inf = inf->next)
 413     if (inf->pid == pid)
 414       return inf->num;
 415
 416   return 0;
 417 }
 418
 419 int
 420 gdb_inferior_id_to_pid (int num)
 421 {
 422   struct inferior *inferior = find_inferior_id (num);
 423   if (inferior)
 424     return inferior->pid;
 425   else
 426     return -1;
 427 }
 428
 429 int
 430 in_inferior_list (int pid)
 431 {
 432   struct inferior *inf;
 433
 434   for (inf = inferior_list; inf; inf = inf->next)
 435     if (inf->pid == pid)
 436       return 1;
 437
 438   return 0;
 439 }
 440
 441 int
 442 have_inferiors (void)
 443 {
 444   struct inferior *inf;
 445
 446   for (inf = inferior_list; inf; inf = inf->next)
 447     if (inf->pid != 0)
 448       return 1;
 449
 450   return 0;
 451 }
 452
 453 int
 454 have_live_inferiors (void)
 455 {
 456   struct inferior *inf;
 457
 458   for (inf = inferior_list; inf; inf = inf->next)
 459     if (inf->pid != 0)
 460       {
 461         struct thread_info *tp;
 462
 463         tp = any_thread_of_process (inf->pid);
 464         if (tp && target_has_execution_1 (tp->ptid))
 465           break;
 466       }
 467
 468   return inf != NULL;
 469 }
 470
 471 /* Prune away any unused inferiors, and then prune away no longer used
 472    program spaces.  */
 473
 474 void
 475 prune_inferiors (void)
 476 {
 477   struct inferior *ss, **ss_link;
 478   struct inferior *current = current_inferior ();
 479
 480   ss = inferior_list;
 481   ss_link = &inferior_list;
 482   while (ss)
 483     {
 484       if (ss == current
 485           || !ss->removable
 486           || ss->pid != 0)
 487         {
 488           ss_link = &ss->next;
 489           ss = *ss_link;
 490           continue;
 491         }
 492
 493       *ss_link = ss->next;
 494       delete_inferior (ss);
 495       ss = *ss_link;
 496     }
 497 }
 498
 499 /* Simply returns the count of inferiors.  */
 500
 501 int
 502 number_of_inferiors (void)
 503 {
 504   struct inferior *inf;
 505   int count = 0;
 506
 507   for (inf = inferior_list; inf != NULL; inf = inf->next)
 508     count++;
 509
 510   return count;
 511 }
 512
 513 /* Converts an inferior process id to a string.  Like
 514    target_pid_to_str, but special cases the null process.  */
 515
 516 static char *
 517 inferior_pid_to_str (int pid)
 518 {
 519   if (pid != 0)
 520     return target_pid_to_str (pid_to_ptid (pid));
 521   else
 522     return _("<null>");
 523 }
 524
 525 /* Prints the list of inferiors and their details on UIOUT.  This is a
 526    version of 'info_inferior_command' suitable for use from MI.
 527
 528    If REQUESTED_INFERIORS is not NULL, it's a list of GDB ids of the
 529    inferiors that should be printed.  Otherwise, all inferiors are
 530    printed.  */
 531
 532 static void
 533 print_inferior (struct ui_out *uiout, char *requested_inferiors)
 534 {
 535   struct inferior *inf;
 536   struct cleanup *old_chain;
 537   int inf_count = 0;
 538
 539   /* Compute number of inferiors we will print.  */
 540   for (inf = inferior_list; inf; inf = inf->next)
 541     {
 542       if (!number_is_in_list (requested_inferiors, inf->num))
 543         continue;
 544
 545       ++inf_count;
 546     }
 547
 548   if (inf_count == 0)
 549     {
 550       ui_out_message (uiout, 0, "No inferiors.\n");
 551       return;
 552     }
 553
 554   old_chain = make_cleanup_ui_out_table_begin_end (uiout, 4, inf_count,
 555                                                    "inferiors");
 556   ui_out_table_header (uiout, 1, ui_left, "current", "");
 557   ui_out_table_header (uiout, 4, ui_left, "number", "Num");
 558   ui_out_table_header (uiout, 17, ui_left, "target-id", "Description");
 559   ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
 560
 561   ui_out_table_body (uiout);
 562   for (inf = inferior_list; inf; inf = inf->next)
 563     {
 564       struct cleanup *chain2;
 565
 566       if (!number_is_in_list (requested_inferiors, inf->num))
 567         continue;
 568
 569       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 570
 571       if (inf == current_inferior ())
 572         ui_out_field_string (uiout, "current", "*");
 573       else
 574         ui_out_field_skip (uiout, "current");
 575
 576       ui_out_field_int (uiout, "number", inf->num);
 577
 578       ui_out_field_string (uiout, "target-id",
 579                            inferior_pid_to_str (inf->pid));
 580
 581       if (inf->pspace->pspace_exec_filename != NULL)
 582         ui_out_field_string (uiout, "exec", inf->pspace->pspace_exec_filename);
 583       else
 584         ui_out_field_skip (uiout, "exec");
 585
 586       /* Print extra info that isn't really fit to always present in
 587          tabular form.  Currently we print the vfork parent/child
 588          relationships, if any.  */
 589       if (inf->vfork_parent)
 590         {
 591           ui_out_text (uiout, _("\n\tis vfork child of inferior "));
 592           ui_out_field_int (uiout, "vfork-parent", inf->vfork_parent->num);
 593         }
 594       if (inf->vfork_child)
 595         {
 596           ui_out_text (uiout, _("\n\tis vfork parent of inferior "));
 597           ui_out_field_int (uiout, "vfork-child", inf->vfork_child->num);
 598         }
 599
 600       ui_out_text (uiout, "\n");
 601       do_cleanups (chain2);
 602     }
 603
 604   do_cleanups (old_chain);
 605 }
 606
 607 static void
 608 detach_inferior_command (char *args, int from_tty)
 609 {
 610   int num, pid;
 611   struct thread_info *tp;
 612   struct get_number_or_range_state state;
 613
 614   if (!args || !*args)
 615     error (_("Requires argument (inferior id(s) to detach)"));
 616
 617   init_number_or_range (&state, args);
 618   while (!state.finished)
 619     {
 620       num = get_number_or_range (&state);
 621
 622       if (!valid_gdb_inferior_id (num))
 623         {
 624           warning (_("Inferior ID %d not known."), num);
 625           continue;
 626         }
 627
 628       pid = gdb_inferior_id_to_pid (num);
 629       if (pid == 0)
 630         {
 631           warning (_("Inferior ID %d is not running."), num);
 632           continue;
 633         }
 634
 635       tp = any_thread_of_process (pid);
 636       if (!tp)
 637         {
 638           warning (_("Inferior ID %d has no threads."), num);
 639           continue;
 640         }
 641
 642       switch_to_thread (tp->ptid);
 643
 644       detach_command (NULL, from_tty);
 645     }
 646 }
 647
 648 static void
 649 kill_inferior_command (char *args, int from_tty)
 650 {
 651   int num, pid;
 652   struct thread_info *tp;
 653   struct get_number_or_range_state state;
 654
 655   if (!args || !*args)
 656     error (_("Requires argument (inferior id(s) to kill)"));
 657
 658   init_number_or_range (&state, args);
 659   while (!state.finished)
 660     {
 661       num = get_number_or_range (&state);
 662
 663       if (!valid_gdb_inferior_id (num))
 664         {
 665           warning (_("Inferior ID %d not known."), num);
 666           continue;
 667         }
 668
 669       pid = gdb_inferior_id_to_pid (num);
 670       if (pid == 0)
 671         {
 672           warning (_("Inferior ID %d is not running."), num);
 673           continue;
 674         }
 675
 676       tp = any_thread_of_process (pid);
 677       if (!tp)
 678         {
 679           warning (_("Inferior ID %d has no threads."), num);
 680           continue;
 681         }
 682
 683       switch_to_thread (tp->ptid);
 684
 685       target_kill ();
 686     }
 687
 688   bfd_cache_close_all ();
 689 }
 690
 691 static void
 692 inferior_command (char *args, int from_tty)
 693 {
 694   struct inferior *inf;
 695   int num;
 696
 697   num = parse_and_eval_long (args);
 698
 699   inf = find_inferior_id (num);
 700   if (inf == NULL)
 701     error (_("Inferior ID %d not known."), num);
 702
 703   printf_filtered (_("[Switching to inferior %d [%s] (%s)]\n"),
 704                    inf->num,
 705                    inferior_pid_to_str (inf->pid),
 706                    (inf->pspace->pspace_exec_filename != NULL
 707                     ? inf->pspace->pspace_exec_filename
 708                     : _("<noexec>")));
 709
 710   if (inf->pid != 0)
 711     {
 712       if (inf->pid != ptid_get_pid (inferior_ptid))
 713         {
 714           struct thread_info *tp;
 715
 716           tp = any_thread_of_process (inf->pid);
 717           if (!tp)
 718             error (_("Inferior has no threads."));
 719
 720           switch_to_thread (tp->ptid);
 721         }
 722
 723       printf_filtered (_("[Switching to thread %d (%s)] "),
 724                        pid_to_thread_id (inferior_ptid),
 725                        target_pid_to_str (inferior_ptid));
 726     }
 727   else
 728     {
 729       struct inferior *inf;
 730
 731       inf = find_inferior_id (num);
 732       set_current_inferior (inf);
 733       switch_to_thread (null_ptid);
 734       set_current_program_space (inf->pspace);
 735     }
 736
 737   if (inf->pid != 0 && is_running (inferior_ptid))
 738     ui_out_text (current_uiout, "(running)\n");
 739   else if (inf->pid != 0)
 740     {
 741       ui_out_text (current_uiout, "\n");
 742       print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
 743     }
 744 }
 745
 746 /* Print information about currently known inferiors.  */
 747
 748 static void
 749 info_inferiors_command (char *args, int from_tty)
 750 {
 751   print_inferior (current_uiout, args);
 752 }
 753
 754 /* remove-inferior ID */
 755
 756 static void
 757 remove_inferior_command (char *args, int from_tty)
 758 {
 759   int num;
 760   struct inferior *inf;
 761   struct get_number_or_range_state state;
 762
 763   if (args == NULL || *args == '\0')
 764     error (_("Requires an argument (inferior id(s) to remove)"));
 765
 766   init_number_or_range (&state, args);
 767   while (!state.finished)
 768     {
 769       num = get_number_or_range (&state);
 770       inf = find_inferior_id (num);
 771
 772       if (inf == NULL)
 773         {
 774           warning (_("Inferior ID %d not known."), num);
 775           continue;
 776         }
 777
 778       if (inf == current_inferior ())
 779         {
 780           warning (_("Can not remove current symbol inferior %d."), num);
 781           continue;
 782         }
 783
 784       if (inf->pid != 0)
 785         {
 786           warning (_("Can not remove active inferior %d."), num);
 787           continue;
 788         }
 789
 790       delete_inferior (inf);
 791     }
 792 }
 793
 794 struct inferior *
 795 add_inferior_with_spaces (void)
 796 {
 797   struct address_space *aspace;
 798   struct program_space *pspace;
 799   struct inferior *inf;
 800   struct gdbarch_info info;
 801
 802   /* If all inferiors share an address space on this system, this
 803      doesn't really return a new address space; otherwise, it
 804      really does.  */
 805   aspace = maybe_new_address_space ();
 806   pspace = add_program_space (aspace);
 807   inf = add_inferior (0);
 808   inf->pspace = pspace;
 809   inf->aspace = pspace->aspace;
 810
 811   /* Setup the inferior's initial arch, based on information obtained
 812      from the global "set ..." options.  */
 813   gdbarch_info_init (&info);
 814   inf->gdbarch = gdbarch_find_by_info (info);
 815   /* The "set ..." options reject invalid settings, so we should
 816      always have a valid arch by now.  */
 817   gdb_assert (inf->gdbarch != NULL);
 818
 819   return inf;
 820 }
 821
 822 /* add-inferior [-copies N] [-exec FILENAME]  */
 823
 824 static void
 825 add_inferior_command (char *args, int from_tty)
 826 {
 827   int i, copies = 1;
 828   char *exec = NULL;
 829   char **argv;
 830   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 831
 832   if (args)
 833     {
 834       argv = gdb_buildargv (args);
 835       make_cleanup_freeargv (argv);
 836
 837       for (; *argv != NULL; argv++)
 838         {
 839           if (**argv == '-')
 840             {
 841               if (strcmp (*argv, "-copies") == 0)
 842                 {
 843                   ++argv;
 844                   if (!*argv)
 845                     error (_("No argument to -copies"));
 846                   copies = parse_and_eval_long (*argv);
 847                 }
 848               else if (strcmp (*argv, "-exec") == 0)
 849                 {
 850                   ++argv;
 851                   if (!*argv)
 852                     error (_("No argument to -exec"));
 853                   exec = tilde_expand (*argv);
 854                   make_cleanup (xfree, exec);
 855                 }
 856             }
 857           else
 858             error (_("Invalid argument"));
 859         }
 860     }
 861
 862   save_current_space_and_thread ();
 863
 864   for (i = 0; i < copies; ++i)
 865     {
 866       struct inferior *inf = add_inferior_with_spaces ();
 867
 868       printf_filtered (_("Added inferior %d\n"), inf->num);
 869
 870       if (exec != NULL)
 871         {
 872           /* Switch over temporarily, while reading executable and
 873              symbols.q.  */
 874           set_current_program_space (inf->pspace);
 875           set_current_inferior (inf);
 876           switch_to_thread (null_ptid);
 877
 878           exec_file_attach (exec, from_tty);
 879           symbol_file_add_main (exec, from_tty);
 880         }
 881     }
 882
 883   do_cleanups (old_chain);
 884 }
 885
 886 /* clone-inferior [-copies N] [ID] */
 887
 888 static void
 889 clone_inferior_command (char *args, int from_tty)
 890 {
 891   int i, copies = 1;
 892   char **argv;
 893   struct inferior *orginf = NULL;
 894   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 895
 896   if (args)
 897     {
 898       argv = gdb_buildargv (args);
 899       make_cleanup_freeargv (argv);
 900
 901       for (; *argv != NULL; argv++)
 902         {
 903           if (**argv == '-')
 904             {
 905               if (strcmp (*argv, "-copies") == 0)
 906                 {
 907                   ++argv;
 908                   if (!*argv)
 909                     error (_("No argument to -copies"));
 910                   copies = parse_and_eval_long (*argv);
 911
 912                   if (copies < 0)
 913                     error (_("Invalid copies number"));
 914                 }
 915             }
 916           else
 917             {
 918               if (orginf == NULL)
 919                 {
 920                   int num;
 921
 922                   /* The first non-option (-) argument specified the
 923                      program space ID.  */
 924                   num = parse_and_eval_long (*argv);
 925                   orginf = find_inferior_id (num);
 926
 927                   if (orginf == NULL)
 928                     error (_("Inferior ID %d not known."), num);
 929                   continue;
 930                 }
 931               else
 932                 error (_("Invalid argument"));
 933             }
 934         }
 935     }
 936
 937   /* If no inferior id was specified, then the user wants to clone the
 938      current inferior.  */
 939   if (orginf == NULL)
 940     orginf = current_inferior ();
 941
 942   save_current_space_and_thread ();
 943
 944   for (i = 0; i < copies; ++i)
 945     {
 946       struct address_space *aspace;
 947       struct program_space *pspace;
 948       struct inferior *inf;
 949
 950       /* If all inferiors share an address space on this system, this
 951          doesn't really return a new address space; otherwise, it
 952          really does.  */
 953       aspace = maybe_new_address_space ();
 954       pspace = add_program_space (aspace);
 955       inf = add_inferior (0);
 956       inf->pspace = pspace;
 957       inf->aspace = pspace->aspace;
 958       inf->gdbarch = orginf->gdbarch;
 959
 960       /* If the original inferior had a user specified target
 961          description, make the clone use it too.  */
 962       if (target_desc_info_from_user_p (inf->tdesc_info))
 963         copy_inferior_target_desc_info (inf, orginf);
 964
 965       printf_filtered (_("Added inferior %d.\n"), inf->num);
 966
 967       set_current_inferior (inf);
 968       switch_to_thread (null_ptid);
 969       clone_program_space (pspace, orginf->pspace);
 970     }
 971
 972   do_cleanups (old_chain);
 973 }
 974
 975 /* Print notices when new inferiors are created and die.  */
 976 static void
 977 show_print_inferior_events (struct ui_file *file, int from_tty,
 978                            struct cmd_list_element *c, const char *value)
 979 {
 980   fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
 981 }
 982
 983 \f
 984
 985 void
 986 initialize_inferiors (void)
 987 {
 988   struct cmd_list_element *c = NULL;
 989
 990   /* There's always one inferior.  Note that this function isn't an
 991      automatic _initialize_foo function, since other _initialize_foo
 992      routines may need to install their per-inferior data keys.  We
 993      can only allocate an inferior when all those modules have done
 994      that.  Do this after initialize_progspace, due to the
 995      current_program_space reference.  */
 996   current_inferior_ = add_inferior (0);
 997   current_inferior_->pspace = current_program_space;
 998   current_inferior_->aspace = current_program_space->aspace;
 999   /* The architecture will be initialized shortly, by
1000      initialize_current_architecture.  */
1001
1002   add_info ("inferiors", info_inferiors_command,
1003             _("IDs of specified inferiors (all inferiors if no argument)."));
1004
1005   c = add_com ("add-inferior", no_class, add_inferior_command, _("\
1006 Add a new inferior.\n\
1007 Usage: add-inferior [-copies <N>] [-exec <FILENAME>]\n\
1008 N is the optional number of inferiors to add, default is 1.\n\
1009 FILENAME is the file name of the executable to use\n\
1010 as main program."));
1011   set_cmd_completer (c, filename_completer);
1012
1013   add_com ("remove-inferiors", no_class, remove_inferior_command, _("\
1014 Remove inferior ID (or list of IDs).\n\
1015 Usage: remove-inferiors ID..."));
1016
1017   add_com ("clone-inferior", no_class, clone_inferior_command, _("\
1018 Clone inferior ID.\n\
1019 Usage: clone-inferior [-copies <N>] [ID]\n\
1020 Add N copies of inferior ID.  The new inferior has the same\n\
1021 executable loaded as the copied inferior.  If -copies is not specified,\n\
1022 adds 1 copy.  If ID is not specified, it is the current inferior\n\
1023 that is cloned."));
1024
1025   add_cmd ("inferiors", class_run, detach_inferior_command, _("\
1026 Detach from inferior ID (or list of IDS)."),
1027            &detachlist);
1028
1029   add_cmd ("inferiors", class_run, kill_inferior_command, _("\
1030 Kill inferior ID (or list of IDs)."),
1031            &killlist);
1032
1033   add_cmd ("inferior", class_run, inferior_command, _("\
1034 Use this command to switch between inferiors.\n\
1035 The new inferior ID must be currently known."),
1036            &cmdlist);
1037
1038   add_setshow_boolean_cmd ("inferior-events", no_class,
1039          &print_inferior_events, _("\
1040 Set printing of inferior events (e.g., inferior start and exit)."), _("\
1041 Show printing of inferior events (e.g., inferior start and exit)."), NULL,
1042          NULL,
1043          show_print_inferior_events,
1044          &setprintlist, &showprintlist);
1045
1046 }