gdb/inferior.c

   1 /* Multi-process control for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2013 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 "gdbthread.h"
  31 #include "gdbcore.h"
  32 #include "symfile.h"
  33 #include "environ.h"
  34 #include "cli/cli-utils.h"
  35 #include "continuations.h"
  36 #include "arch-utils.h"
  37 #include "target-descriptions.h"
  38 #include "readline/tilde.h"
  39
  40 void _initialize_inferiors (void);
  41
  42 /* Keep a registry of per-inferior data-pointers required by other GDB
  43    modules.  */
  44
  45 DEFINE_REGISTRY (inferior, REGISTRY_ACCESS_FIELD)
  46
  47 struct inferior *inferior_list = NULL;
  48 static int highest_inferior_num;
  49
  50 /* Print notices on inferior events (attach, detach, etc.), set with
  51    `set print inferior-events'.  */
  52 static int print_inferior_events = 0;
  53
  54 /* The Current Inferior.  */
  55 static struct inferior *current_inferior_ = NULL;
  56
  57 struct inferior*
  58 current_inferior (void)
  59 {
  60   return current_inferior_;
  61 }
  62
  63 void
  64 set_current_inferior (struct inferior *inf)
  65 {
  66   /* There's always an inferior.  */
  67   gdb_assert (inf != NULL);
  68
  69   current_inferior_ = inf;
  70 }
  71
  72 /* A cleanups callback, helper for save_current_program_space
  73    below.  */
  74
  75 static void
  76 restore_inferior (void *arg)
  77 {
  78   struct inferior *saved_inferior = arg;
  79
  80   set_current_inferior (saved_inferior);
  81 }
  82
  83 /* Save the current program space so that it may be restored by a later
  84    call to do_cleanups.  Returns the struct cleanup pointer needed for
  85    later doing the cleanup.  */
  86
  87 struct cleanup *
  88 save_current_inferior (void)
  89 {
  90   struct cleanup *old_chain = make_cleanup (restore_inferior,
  91                                             current_inferior_);
  92
  93   return old_chain;
  94 }
  95
  96 static void
  97 free_inferior (struct inferior *inf)
  98 {
  99   discard_all_inferior_continuations (inf);
 100   inferior_free_data (inf);
 101   xfree (inf->args);
 102   xfree (inf->terminal);
 103   free_environ (inf->environment);
 104   target_desc_info_free (inf->tdesc_info);
 105   xfree (inf->private);
 106   xfree (inf);
 107 }
 108
 109 void
 110 init_inferior_list (void)
 111 {
 112   struct inferior *inf, *infnext;
 113
 114   highest_inferior_num = 0;
 115   if (!inferior_list)
 116     return;
 117
 118   for (inf = inferior_list; inf; inf = infnext)
 119     {
 120       infnext = inf->next;
 121       free_inferior (inf);
 122     }
 123
 124   inferior_list = NULL;
 125 }
 126
 127 struct inferior *
 128 add_inferior_silent (int pid)
 129 {
 130   struct inferior *inf;
 131
 132   inf = xmalloc (sizeof (*inf));
 133   memset (inf, 0, sizeof (*inf));
 134   inf->pid = pid;
 135
 136   inf->control.stop_soon = NO_STOP_QUIETLY;
 137
 138   inf->num = ++highest_inferior_num;
 139   inf->next = inferior_list;
 140   inferior_list = inf;
 141
 142   inf->environment = make_environ ();
 143   init_environ (inf->environment);
 144
 145   inferior_alloc_data (inf);
 146
 147   observer_notify_inferior_added (inf);
 148
 149   if (pid != 0)
 150     inferior_appeared (inf, pid);
 151
 152   return inf;
 153 }
 154
 155 struct inferior *
 156 add_inferior (int pid)
 157 {
 158   struct inferior *inf = add_inferior_silent (pid);
 159
 160   if (print_inferior_events)
 161     printf_unfiltered (_("[New inferior %d]\n"), pid);
 162
 163   return inf;
 164 }
 165
 166 struct delete_thread_of_inferior_arg
 167 {
 168   int pid;
 169   int silent;
 170 };
 171
 172 static int
 173 delete_thread_of_inferior (struct thread_info *tp, void *data)
 174 {
 175   struct delete_thread_of_inferior_arg *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 /* If SILENT then be quiet -- don't announce a inferior death, or the
 189    exit of its threads.  */
 190
 191 void
 192 delete_inferior_1 (struct inferior *todel, int silent)
 193 {
 194   struct inferior *inf, *infprev;
 195   struct delete_thread_of_inferior_arg arg;
 196
 197   infprev = NULL;
 198
 199   for (inf = inferior_list; inf; infprev = inf, inf = inf->next)
 200     if (inf == todel)
 201       break;
 202
 203   if (!inf)
 204     return;
 205
 206   arg.pid = inf->pid;
 207   arg.silent = silent;
 208
 209   iterate_over_threads (delete_thread_of_inferior, &arg);
 210
 211   if (infprev)
 212     infprev->next = inf->next;
 213   else
 214     inferior_list = inf->next;
 215
 216   observer_notify_inferior_removed (inf);
 217
 218   free_inferior (inf);
 219 }
 220
 221 void
 222 delete_inferior (int pid)
 223 {
 224   struct inferior *inf = find_inferior_pid (pid);
 225
 226   delete_inferior_1 (inf, 0);
 227
 228   if (print_inferior_events)
 229     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 230 }
 231
 232 void
 233 delete_inferior_silent (int pid)
 234 {
 235   struct inferior *inf = find_inferior_pid (pid);
 236
 237   delete_inferior_1 (inf, 1);
 238 }
 239
 240
 241 /* If SILENT then be quiet -- don't announce a inferior exit, or the
 242    exit of its threads.  */
 243
 244 static void
 245 exit_inferior_1 (struct inferior *inftoex, int silent)
 246 {
 247   struct inferior *inf;
 248   struct delete_thread_of_inferior_arg arg;
 249
 250   for (inf = inferior_list; inf; inf = inf->next)
 251     if (inf == inftoex)
 252       break;
 253
 254   if (!inf)
 255     return;
 256
 257   arg.pid = inf->pid;
 258   arg.silent = silent;
 259
 260   iterate_over_threads (delete_thread_of_inferior, &arg);
 261
 262   /* Notify the observers before removing the inferior from the list,
 263      so that the observers have a chance to look it up.  */
 264   observer_notify_inferior_exit (inf);
 265
 266   inf->pid = 0;
 267   inf->fake_pid_p = 0;
 268   if (inf->vfork_parent != NULL)
 269     {
 270       inf->vfork_parent->vfork_child = NULL;
 271       inf->vfork_parent = NULL;
 272     }
 273   if (inf->vfork_child != NULL)
 274     {
 275       inf->vfork_child->vfork_parent = NULL;
 276       inf->vfork_child = NULL;
 277     }
 278
 279   inf->has_exit_code = 0;
 280   inf->exit_code = 0;
 281   inf->pending_detach = 0;
 282 }
 283
 284 void
 285 exit_inferior (int pid)
 286 {
 287   struct inferior *inf = find_inferior_pid (pid);
 288
 289   exit_inferior_1 (inf, 0);
 290
 291   if (print_inferior_events)
 292     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 293 }
 294
 295 void
 296 exit_inferior_silent (int pid)
 297 {
 298   struct inferior *inf = find_inferior_pid (pid);
 299
 300   exit_inferior_1 (inf, 1);
 301 }
 302
 303 void
 304 exit_inferior_num_silent (int num)
 305 {
 306   struct inferior *inf = find_inferior_id (num);
 307
 308   exit_inferior_1 (inf, 1);
 309 }
 310
 311 void
 312 detach_inferior (int pid)
 313 {
 314   struct inferior *inf = find_inferior_pid (pid);
 315
 316   exit_inferior_1 (inf, 1);
 317
 318   if (print_inferior_events)
 319     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
 320 }
 321
 322 void
 323 inferior_appeared (struct inferior *inf, int pid)
 324 {
 325   inf->pid = pid;
 326
 327   observer_notify_inferior_appeared (inf);
 328 }
 329
 330 void
 331 discard_all_inferiors (void)
 332 {
 333   struct inferior *inf;
 334
 335   for (inf = inferior_list; inf; inf = inf->next)
 336     {
 337       if (inf->pid != 0)
 338         exit_inferior_silent (inf->pid);
 339     }
 340 }
 341
 342 struct inferior *
 343 find_inferior_id (int num)
 344 {
 345   struct inferior *inf;
 346
 347   for (inf = inferior_list; inf; inf = inf->next)
 348     if (inf->num == num)
 349       return inf;
 350
 351   return NULL;
 352 }
 353
 354 struct inferior *
 355 find_inferior_pid (int pid)
 356 {
 357   struct inferior *inf;
 358
 359   /* Looking for inferior pid == 0 is always wrong, and indicative of
 360      a bug somewhere else.  There may be more than one with pid == 0,
 361      for instance.  */
 362   gdb_assert (pid != 0);
 363
 364   for (inf = inferior_list; inf; inf = inf->next)
 365     if (inf->pid == pid)
 366       return inf;
 367
 368   return NULL;
 369 }
 370
 371 /* Find an inferior bound to PSPACE.  */
 372
 373 struct inferior *
 374 find_inferior_for_program_space (struct program_space *pspace)
 375 {
 376   struct inferior *inf;
 377
 378   for (inf = inferior_list; inf != NULL; inf = inf->next)
 379     {
 380       if (inf->pspace == pspace)
 381         return inf;
 382     }
 383
 384   return NULL;
 385 }
 386
 387 struct inferior *
 388 iterate_over_inferiors (int (*callback) (struct inferior *, void *),
 389                         void *data)
 390 {
 391   struct inferior *inf, *infnext;
 392
 393   for (inf = inferior_list; inf; inf = infnext)
 394     {
 395       infnext = inf->next;
 396       if ((*callback) (inf, data))
 397         return inf;
 398     }
 399
 400   return NULL;
 401 }
 402
 403 int
 404 valid_gdb_inferior_id (int num)
 405 {
 406   struct inferior *inf;
 407
 408   for (inf = inferior_list; inf; inf = inf->next)
 409     if (inf->num == num)
 410       return 1;
 411
 412   return 0;
 413 }
 414
 415 int
 416 pid_to_gdb_inferior_id (int pid)
 417 {
 418   struct inferior *inf;
 419
 420   for (inf = inferior_list; inf; inf = inf->next)
 421     if (inf->pid == pid)
 422       return inf->num;
 423
 424   return 0;
 425 }
 426
 427 int
 428 gdb_inferior_id_to_pid (int num)
 429 {
 430   struct inferior *inferior = find_inferior_id (num);
 431   if (inferior)
 432     return inferior->pid;
 433   else
 434     return -1;
 435 }
 436
 437 int
 438 in_inferior_list (int pid)
 439 {
 440   struct inferior *inf;
 441
 442   for (inf = inferior_list; inf; inf = inf->next)
 443     if (inf->pid == pid)
 444       return 1;
 445
 446   return 0;
 447 }
 448
 449 int
 450 have_inferiors (void)
 451 {
 452   struct inferior *inf;
 453
 454   for (inf = inferior_list; inf; inf = inf->next)
 455     if (inf->pid != 0)
 456       return 1;
 457
 458   return 0;
 459 }
 460
 461 int
 462 have_live_inferiors (void)
 463 {
 464   struct inferior *inf;
 465
 466   for (inf = inferior_list; inf; inf = inf->next)
 467     if (inf->pid != 0)
 468       {
 469         struct thread_info *tp;
 470
 471         tp = any_thread_of_process (inf->pid);
 472         if (tp && target_has_execution_1 (tp->ptid))
 473           break;
 474       }
 475
 476   return inf != NULL;
 477 }
 478
 479 /* Prune away automatically added program spaces that aren't required
 480    anymore.  */
 481
 482 void
 483 prune_inferiors (void)
 484 {
 485   struct inferior *ss, **ss_link;
 486   struct inferior *current = current_inferior ();
 487
 488   ss = inferior_list;
 489   ss_link = &inferior_list;
 490   while (ss)
 491     {
 492       if (ss == current
 493           || !ss->removable
 494           || ss->pid != 0)
 495         {
 496           ss_link = &ss->next;
 497           ss = *ss_link;
 498           continue;
 499         }
 500
 501       *ss_link = ss->next;
 502       delete_inferior_1 (ss, 1);
 503       ss = *ss_link;
 504     }
 505
 506   prune_program_spaces ();
 507 }
 508
 509 /* Simply returns the count of inferiors.  */
 510
 511 int
 512 number_of_inferiors (void)
 513 {
 514   struct inferior *inf;
 515   int count = 0;
 516
 517   for (inf = inferior_list; inf != NULL; inf = inf->next)
 518     count++;
 519
 520   return count;
 521 }
 522
 523 /* Converts an inferior process id to a string.  Like
 524    target_pid_to_str, but special cases the null process.  */
 525
 526 static char *
 527 inferior_pid_to_str (int pid)
 528 {
 529   if (pid != 0)
 530     return target_pid_to_str (pid_to_ptid (pid));
 531   else
 532     return _("<null>");
 533 }
 534
 535 /* Prints the list of inferiors and their details on UIOUT.  This is a
 536    version of 'info_inferior_command' suitable for use from MI.
 537
 538    If REQUESTED_INFERIORS is not NULL, it's a list of GDB ids of the
 539    inferiors that should be printed.  Otherwise, all inferiors are
 540    printed.  */
 541
 542 static void
 543 print_inferior (struct ui_out *uiout, char *requested_inferiors)
 544 {
 545   struct inferior *inf;
 546   struct cleanup *old_chain;
 547   int inf_count = 0;
 548
 549   /* Compute number of inferiors we will print.  */
 550   for (inf = inferior_list; inf; inf = inf->next)
 551     {
 552       if (!number_is_in_list (requested_inferiors, inf->num))
 553         continue;
 554
 555       ++inf_count;
 556     }
 557
 558   if (inf_count == 0)
 559     {
 560       ui_out_message (uiout, 0, "No inferiors.\n");
 561       return;
 562     }
 563
 564   old_chain = make_cleanup_ui_out_table_begin_end (uiout, 4, inf_count,
 565                                                    "inferiors");
 566   ui_out_table_header (uiout, 1, ui_left, "current", "");
 567   ui_out_table_header (uiout, 4, ui_left, "number", "Num");
 568   ui_out_table_header (uiout, 17, ui_left, "target-id", "Description");
 569   ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
 570
 571   ui_out_table_body (uiout);
 572   for (inf = inferior_list; inf; inf = inf->next)
 573     {
 574       struct cleanup *chain2;
 575
 576       if (!number_is_in_list (requested_inferiors, inf->num))
 577         continue;
 578
 579       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 580
 581       if (inf == current_inferior ())
 582         ui_out_field_string (uiout, "current", "*");
 583       else
 584         ui_out_field_skip (uiout, "current");
 585
 586       ui_out_field_int (uiout, "number", inf->num);
 587
 588       ui_out_field_string (uiout, "target-id",
 589                            inferior_pid_to_str (inf->pid));
 590
 591       if (inf->pspace->pspace_exec_filename != NULL)
 592         ui_out_field_string (uiout, "exec", inf->pspace->pspace_exec_filename);
 593       else
 594         ui_out_field_skip (uiout, "exec");
 595
 596       /* Print extra info that isn't really fit to always present in
 597          tabular form.  Currently we print the vfork parent/child
 598          relationships, if any.  */
 599       if (inf->vfork_parent)
 600         {
 601           ui_out_text (uiout, _("\n\tis vfork child of inferior "));
 602           ui_out_field_int (uiout, "vfork-parent", inf->vfork_parent->num);
 603         }
 604       if (inf->vfork_child)
 605         {
 606           ui_out_text (uiout, _("\n\tis vfork parent of inferior "));
 607           ui_out_field_int (uiout, "vfork-child", inf->vfork_child->num);
 608         }
 609
 610       ui_out_text (uiout, "\n");
 611       do_cleanups (chain2);
 612     }
 613
 614   do_cleanups (old_chain);
 615 }
 616
 617 static void
 618 detach_inferior_command (char *args, int from_tty)
 619 {
 620   int num, pid;
 621   struct thread_info *tp;
 622   struct get_number_or_range_state state;
 623
 624   if (!args || !*args)
 625     error (_("Requires argument (inferior id(s) to detach)"));
 626
 627   init_number_or_range (&state, args);
 628   while (!state.finished)
 629     {
 630       num = get_number_or_range (&state);
 631
 632       if (!valid_gdb_inferior_id (num))
 633         {
 634           warning (_("Inferior ID %d not known."), num);
 635           continue;
 636         }
 637
 638       pid = gdb_inferior_id_to_pid (num);
 639
 640       tp = any_thread_of_process (pid);
 641       if (!tp)
 642         {
 643           warning (_("Inferior ID %d has no threads."), num);
 644           continue;
 645         }
 646
 647       switch_to_thread (tp->ptid);
 648
 649       detach_command (NULL, from_tty);
 650     }
 651 }
 652
 653 static void
 654 kill_inferior_command (char *args, int from_tty)
 655 {
 656   int num, pid;
 657   struct thread_info *tp;
 658   struct get_number_or_range_state state;
 659
 660   if (!args || !*args)
 661     error (_("Requires argument (inferior id(s) to kill)"));
 662
 663   init_number_or_range (&state, args);
 664   while (!state.finished)
 665     {
 666       num = get_number_or_range (&state);
 667
 668       if (!valid_gdb_inferior_id (num))
 669         {
 670           warning (_("Inferior ID %d not known."), num);
 671           continue;
 672         }
 673
 674       pid = gdb_inferior_id_to_pid (num);
 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_1 (inf, 1);
 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 }