gdb/inferior.c

   1 /* Multi-process control for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2016 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
 139   if (inferior_list == NULL)
 140     inferior_list = inf;
 141   else
 142     {
 143       struct inferior *last;
 144
 145       for (last = inferior_list; last->next != NULL; last = last->next)
 146         ;
 147       last->next = inf;
 148     }
 149
 150   inf->environment = make_environ ();
 151   init_environ (inf->environment);
 152
 153   inferior_alloc_data (inf);
 154
 155   observer_notify_inferior_added (inf);
 156
 157   if (pid != 0)
 158     inferior_appeared (inf, pid);
 159
 160   return inf;
 161 }
 162
 163 struct inferior *
 164 add_inferior (int pid)
 165 {
 166   struct inferior *inf = add_inferior_silent (pid);
 167
 168   if (print_inferior_events)
 169     printf_unfiltered (_("[New inferior %d]\n"), pid);
 170
 171   return inf;
 172 }
 173
 174 struct delete_thread_of_inferior_arg
 175 {
 176   int pid;
 177   int silent;
 178 };
 179
 180 static int
 181 delete_thread_of_inferior (struct thread_info *tp, void *data)
 182 {
 183   struct delete_thread_of_inferior_arg *arg
 184     = (struct delete_thread_of_inferior_arg *) data;
 185
 186   if (ptid_get_pid (tp->ptid) == arg->pid)
 187     {
 188       if (arg->silent)
 189         delete_thread_silent (tp->ptid);
 190       else
 191         delete_thread (tp->ptid);
 192     }
 193
 194   return 0;
 195 }
 196
 197 void
 198 delete_inferior (struct inferior *todel)
 199 {
 200   struct inferior *inf, *infprev;
 201   struct delete_thread_of_inferior_arg arg;
 202
 203   infprev = NULL;
 204
 205   for (inf = inferior_list; inf; infprev = inf, inf = inf->next)
 206     if (inf == todel)
 207       break;
 208
 209   if (!inf)
 210     return;
 211
 212   arg.pid = inf->pid;
 213   arg.silent = 1;
 214
 215   iterate_over_threads (delete_thread_of_inferior, &arg);
 216
 217   if (infprev)
 218     infprev->next = inf->next;
 219   else
 220     inferior_list = inf->next;
 221
 222   observer_notify_inferior_removed (inf);
 223
 224   /* If this program space is rendered useless, remove it. */
 225   if (program_space_empty_p (inf->pspace))
 226     delete_program_space (inf->pspace);
 227
 228   free_inferior (inf);
 229 }
 230
 231 /* If SILENT then be quiet -- don't announce a inferior exit, or the
 232    exit of its threads.  */
 233
 234 static void
 235 exit_inferior_1 (struct inferior *inftoex, int silent)
 236 {
 237   struct inferior *inf;
 238   struct delete_thread_of_inferior_arg arg;
 239
 240   for (inf = inferior_list; inf; inf = inf->next)
 241     if (inf == inftoex)
 242       break;
 243
 244   if (!inf)
 245     return;
 246
 247   arg.pid = inf->pid;
 248   arg.silent = silent;
 249
 250   iterate_over_threads (delete_thread_of_inferior, &arg);
 251
 252   observer_notify_inferior_exit (inf);
 253
 254   inf->pid = 0;
 255   inf->fake_pid_p = 0;
 256   xfree (inf->priv);
 257   inf->priv = NULL;
 258
 259   if (inf->vfork_parent != NULL)
 260     {
 261       inf->vfork_parent->vfork_child = NULL;
 262       inf->vfork_parent = NULL;
 263     }
 264   if (inf->vfork_child != NULL)
 265     {
 266       inf->vfork_child->vfork_parent = NULL;
 267       inf->vfork_child = NULL;
 268     }
 269
 270   inf->pending_detach = 0;
 271 }
 272
 273 void
 274 exit_inferior (int pid)
 275 {
 276   struct inferior *inf = find_inferior_pid (pid);
 277
 278   exit_inferior_1 (inf, 0);
 279
 280   if (print_inferior_events)
 281     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 282 }
 283
 284 void
 285 exit_inferior_silent (int pid)
 286 {
 287   struct inferior *inf = find_inferior_pid (pid);
 288
 289   exit_inferior_1 (inf, 1);
 290 }
 291
 292 void
 293 exit_inferior_num_silent (int num)
 294 {
 295   struct inferior *inf = find_inferior_id (num);
 296
 297   exit_inferior_1 (inf, 1);
 298 }
 299
 300 void
 301 detach_inferior (int pid)
 302 {
 303   struct inferior *inf = find_inferior_pid (pid);
 304
 305   exit_inferior_1 (inf, 0);
 306
 307   if (print_inferior_events)
 308     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
 309 }
 310
 311 void
 312 inferior_appeared (struct inferior *inf, int pid)
 313 {
 314   inf->pid = pid;
 315   inf->has_exit_code = 0;
 316   inf->exit_code = 0;
 317
 318   observer_notify_inferior_appeared (inf);
 319 }
 320
 321 void
 322 discard_all_inferiors (void)
 323 {
 324   struct inferior *inf;
 325
 326   for (inf = inferior_list; inf; inf = inf->next)
 327     {
 328       if (inf->pid != 0)
 329         exit_inferior_silent (inf->pid);
 330     }
 331 }
 332
 333 struct inferior *
 334 find_inferior_id (int num)
 335 {
 336   struct inferior *inf;
 337
 338   for (inf = inferior_list; inf; inf = inf->next)
 339     if (inf->num == num)
 340       return inf;
 341
 342   return NULL;
 343 }
 344
 345 struct inferior *
 346 find_inferior_pid (int pid)
 347 {
 348   struct inferior *inf;
 349
 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,
 352      for instance.  */
 353   gdb_assert (pid != 0);
 354
 355   for (inf = inferior_list; inf; inf = inf->next)
 356     if (inf->pid == pid)
 357       return inf;
 358
 359   return NULL;
 360 }
 361
 362 /* See inferior.h */
 363
 364 struct inferior *
 365 find_inferior_ptid (ptid_t ptid)
 366 {
 367   return find_inferior_pid (ptid_get_pid (ptid));
 368 }
 369
 370 /* See inferior.h.  */
 371
 372 struct inferior *
 373 find_inferior_for_program_space (struct program_space *pspace)
 374 {
 375   struct inferior *inf = current_inferior ();
 376
 377   if (inf->pspace == pspace)
 378     return inf;
 379
 380   for (inf = inferior_list; inf != NULL; inf = inf->next)
 381     {
 382       if (inf->pspace == pspace)
 383         return inf;
 384     }
 385
 386   return NULL;
 387 }
 388
 389 struct inferior *
 390 iterate_over_inferiors (int (*callback) (struct inferior *, void *),
 391                         void *data)
 392 {
 393   struct inferior *inf, *infnext;
 394
 395   for (inf = inferior_list; inf; inf = infnext)
 396     {
 397       infnext = inf->next;
 398       if ((*callback) (inf, data))
 399         return inf;
 400     }
 401
 402   return NULL;
 403 }
 404
 405 int
 406 valid_gdb_inferior_id (int num)
 407 {
 408   struct inferior *inf;
 409
 410   for (inf = inferior_list; inf; inf = inf->next)
 411     if (inf->num == num)
 412       return 1;
 413
 414   return 0;
 415 }
 416
 417 int
 418 pid_to_gdb_inferior_id (int pid)
 419 {
 420   struct inferior *inf;
 421
 422   for (inf = inferior_list; inf; inf = inf->next)
 423     if (inf->pid == pid)
 424       return inf->num;
 425
 426   return 0;
 427 }
 428
 429 int
 430 gdb_inferior_id_to_pid (int num)
 431 {
 432   struct inferior *inferior = find_inferior_id (num);
 433   if (inferior)
 434     return inferior->pid;
 435   else
 436     return -1;
 437 }
 438
 439 int
 440 in_inferior_list (int pid)
 441 {
 442   struct inferior *inf;
 443
 444   for (inf = inferior_list; inf; inf = inf->next)
 445     if (inf->pid == pid)
 446       return 1;
 447
 448   return 0;
 449 }
 450
 451 int
 452 have_inferiors (void)
 453 {
 454   struct inferior *inf;
 455
 456   for (inf = inferior_list; inf; inf = inf->next)
 457     if (inf->pid != 0)
 458       return 1;
 459
 460   return 0;
 461 }
 462
 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.  */
 466
 467 int
 468 number_of_live_inferiors (void)
 469 {
 470   struct inferior *inf;
 471   int num_inf = 0;
 472
 473   for (inf = inferior_list; inf; inf = inf->next)
 474     if (inf->pid != 0)
 475       {
 476         struct thread_info *tp;
 477
 478         ALL_NON_EXITED_THREADS (tp)
 479          if (tp && ptid_get_pid (tp->ptid) == inf->pid)
 480            if (target_has_execution_1 (tp->ptid))
 481              {
 482                /* Found a live thread in this inferior, go to the next
 483                   inferior.  */
 484                ++num_inf;
 485                break;
 486              }
 487       }
 488
 489   return num_inf;
 490 }
 491
 492 /* Return true if there is at least one live inferior.  */
 493
 494 int
 495 have_live_inferiors (void)
 496 {
 497   return number_of_live_inferiors () > 0;
 498 }
 499
 500 /* Prune away any unused inferiors, and then prune away no longer used
 501    program spaces.  */
 502
 503 void
 504 prune_inferiors (void)
 505 {
 506   struct inferior *ss, **ss_link;
 507   struct inferior *current = current_inferior ();
 508
 509   ss = inferior_list;
 510   ss_link = &inferior_list;
 511   while (ss)
 512     {
 513       if (ss == current
 514           || !ss->removable
 515           || ss->pid != 0)
 516         {
 517           ss_link = &ss->next;
 518           ss = *ss_link;
 519           continue;
 520         }
 521
 522       *ss_link = ss->next;
 523       delete_inferior (ss);
 524       ss = *ss_link;
 525     }
 526 }
 527
 528 /* Simply returns the count of inferiors.  */
 529
 530 int
 531 number_of_inferiors (void)
 532 {
 533   struct inferior *inf;
 534   int count = 0;
 535
 536   for (inf = inferior_list; inf != NULL; inf = inf->next)
 537     count++;
 538
 539   return count;
 540 }
 541
 542 /* Converts an inferior process id to a string.  Like
 543    target_pid_to_str, but special cases the null process.  */
 544
 545 static char *
 546 inferior_pid_to_str (int pid)
 547 {
 548   if (pid != 0)
 549     return target_pid_to_str (pid_to_ptid (pid));
 550   else
 551     return _("<null>");
 552 }
 553
 554 /* See inferior.h.  */
 555
 556 void
 557 print_selected_inferior (struct ui_out *uiout)
 558 {
 559   struct inferior *inf = current_inferior ();
 560   const char *filename = inf->pspace->pspace_exec_filename;
 561   if (filename == NULL)
 562     filename = _("<noexec>");
 563   ui_out_message (uiout, _("[Switching to inferior %d [%s] (%s)]\n"),
 564                   inf->num, inferior_pid_to_str (inf->pid), filename);
 565 }
 566
 567 /* Prints the list of inferiors and their details on UIOUT.  This is a
 568    version of 'info_inferior_command' suitable for use from MI.
 569
 570    If REQUESTED_INFERIORS is not NULL, it's a list of GDB ids of the
 571    inferiors that should be printed.  Otherwise, all inferiors are
 572    printed.  */
 573
 574 static void
 575 print_inferior (struct ui_out *uiout, char *requested_inferiors)
 576 {
 577   struct inferior *inf;
 578   struct cleanup *old_chain;
 579   int inf_count = 0;
 580
 581   /* Compute number of inferiors we will print.  */
 582   for (inf = inferior_list; inf; inf = inf->next)
 583     {
 584       if (!number_is_in_list (requested_inferiors, inf->num))
 585         continue;
 586
 587       ++inf_count;
 588     }
 589
 590   if (inf_count == 0)
 591     {
 592       ui_out_message (uiout, "No inferiors.\n");
 593       return;
 594     }
 595
 596   old_chain = make_cleanup_ui_out_table_begin_end (uiout, 4, inf_count,
 597                                                    "inferiors");
 598   ui_out_table_header (uiout, 1, ui_left, "current", "");
 599   ui_out_table_header (uiout, 4, ui_left, "number", "Num");
 600   ui_out_table_header (uiout, 17, ui_left, "target-id", "Description");
 601   ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
 602
 603   ui_out_table_body (uiout);
 604   for (inf = inferior_list; inf; inf = inf->next)
 605     {
 606       struct cleanup *chain2;
 607
 608       if (!number_is_in_list (requested_inferiors, inf->num))
 609         continue;
 610
 611       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 612
 613       if (inf == current_inferior ())
 614         ui_out_field_string (uiout, "current", "*");
 615       else
 616         ui_out_field_skip (uiout, "current");
 617
 618       ui_out_field_int (uiout, "number", inf->num);
 619
 620       ui_out_field_string (uiout, "target-id",
 621                            inferior_pid_to_str (inf->pid));
 622
 623       if (inf->pspace->pspace_exec_filename != NULL)
 624         ui_out_field_string (uiout, "exec", inf->pspace->pspace_exec_filename);
 625       else
 626         ui_out_field_skip (uiout, "exec");
 627
 628       /* Print extra info that isn't really fit to always present in
 629          tabular form.  Currently we print the vfork parent/child
 630          relationships, if any.  */
 631       if (inf->vfork_parent)
 632         {
 633           ui_out_text (uiout, _("\n\tis vfork child of inferior "));
 634           ui_out_field_int (uiout, "vfork-parent", inf->vfork_parent->num);
 635         }
 636       if (inf->vfork_child)
 637         {
 638           ui_out_text (uiout, _("\n\tis vfork parent of inferior "));
 639           ui_out_field_int (uiout, "vfork-child", inf->vfork_child->num);
 640         }
 641
 642       ui_out_text (uiout, "\n");
 643       do_cleanups (chain2);
 644     }
 645
 646   do_cleanups (old_chain);
 647 }
 648
 649 static void
 650 detach_inferior_command (char *args, int from_tty)
 651 {
 652   struct thread_info *tp;
 653
 654   if (!args || !*args)
 655     error (_("Requires argument (inferior id(s) to detach)"));
 656
 657   number_or_range_parser parser (args);
 658   while (!parser.finished ())
 659     {
 660       int num = parser.get_number ();
 661
 662       if (!valid_gdb_inferior_id (num))
 663         {
 664           warning (_("Inferior ID %d not known."), num);
 665           continue;
 666         }
 667
 668       int pid = gdb_inferior_id_to_pid (num);
 669       if (pid == 0)
 670         {
 671           warning (_("Inferior ID %d is not running."), num);
 672           continue;
 673         }
 674
 675       tp = any_thread_of_process (pid);
 676       if (!tp)
 677         {
 678           warning (_("Inferior ID %d has no threads."), num);
 679           continue;
 680         }
 681
 682       switch_to_thread (tp->ptid);
 683
 684       detach_command (NULL, from_tty);
 685     }
 686 }
 687
 688 static void
 689 kill_inferior_command (char *args, int from_tty)
 690 {
 691   struct thread_info *tp;
 692
 693   if (!args || !*args)
 694     error (_("Requires argument (inferior id(s) to kill)"));
 695
 696   number_or_range_parser parser (args);
 697   while (!parser.finished ())
 698     {
 699       int num = parser.get_number ();
 700
 701       if (!valid_gdb_inferior_id (num))
 702         {
 703           warning (_("Inferior ID %d not known."), num);
 704           continue;
 705         }
 706
 707       int pid = gdb_inferior_id_to_pid (num);
 708       if (pid == 0)
 709         {
 710           warning (_("Inferior ID %d is not running."), num);
 711           continue;
 712         }
 713
 714       tp = any_thread_of_process (pid);
 715       if (!tp)
 716         {
 717           warning (_("Inferior ID %d has no threads."), num);
 718           continue;
 719         }
 720
 721       switch_to_thread (tp->ptid);
 722
 723       target_kill ();
 724     }
 725
 726   bfd_cache_close_all ();
 727 }
 728
 729 static void
 730 inferior_command (char *args, int from_tty)
 731 {
 732   struct inferior *inf;
 733   int num;
 734
 735   num = parse_and_eval_long (args);
 736
 737   inf = find_inferior_id (num);
 738   if (inf == NULL)
 739     error (_("Inferior ID %d not known."), num);
 740
 741   if (inf->pid != 0)
 742     {
 743       if (inf->pid != ptid_get_pid (inferior_ptid))
 744         {
 745           struct thread_info *tp;
 746
 747           tp = any_thread_of_process (inf->pid);
 748           if (!tp)
 749             error (_("Inferior has no threads."));
 750
 751           switch_to_thread (tp->ptid);
 752         }
 753
 754       observer_notify_user_selected_context_changed
 755         (USER_SELECTED_INFERIOR
 756          | USER_SELECTED_THREAD
 757          | USER_SELECTED_FRAME);
 758     }
 759   else
 760     {
 761       set_current_inferior (inf);
 762       switch_to_thread (null_ptid);
 763       set_current_program_space (inf->pspace);
 764
 765       observer_notify_user_selected_context_changed (USER_SELECTED_INFERIOR);
 766     }
 767 }
 768
 769 /* Print information about currently known inferiors.  */
 770
 771 static void
 772 info_inferiors_command (char *args, int from_tty)
 773 {
 774   print_inferior (current_uiout, args);
 775 }
 776
 777 /* remove-inferior ID */
 778
 779 static void
 780 remove_inferior_command (char *args, int from_tty)
 781 {
 782   if (args == NULL || *args == '\0')
 783     error (_("Requires an argument (inferior id(s) to remove)"));
 784
 785   number_or_range_parser parser (args);
 786   while (!parser.finished ())
 787     {
 788       int num = parser.get_number ();
 789       struct inferior *inf = find_inferior_id (num);
 790
 791       if (inf == NULL)
 792         {
 793           warning (_("Inferior ID %d not known."), num);
 794           continue;
 795         }
 796
 797       if (inf == current_inferior ())
 798         {
 799           warning (_("Can not remove current inferior %d."), num);
 800           continue;
 801         }
 802
 803       if (inf->pid != 0)
 804         {
 805           warning (_("Can not remove active inferior %d."), num);
 806           continue;
 807         }
 808
 809       delete_inferior (inf);
 810     }
 811 }
 812
 813 struct inferior *
 814 add_inferior_with_spaces (void)
 815 {
 816   struct address_space *aspace;
 817   struct program_space *pspace;
 818   struct inferior *inf;
 819   struct gdbarch_info info;
 820
 821   /* If all inferiors share an address space on this system, this
 822      doesn't really return a new address space; otherwise, it
 823      really does.  */
 824   aspace = maybe_new_address_space ();
 825   pspace = add_program_space (aspace);
 826   inf = add_inferior (0);
 827   inf->pspace = pspace;
 828   inf->aspace = pspace->aspace;
 829
 830   /* Setup the inferior's initial arch, based on information obtained
 831      from the global "set ..." options.  */
 832   gdbarch_info_init (&info);
 833   inf->gdbarch = gdbarch_find_by_info (info);
 834   /* The "set ..." options reject invalid settings, so we should
 835      always have a valid arch by now.  */
 836   gdb_assert (inf->gdbarch != NULL);
 837
 838   return inf;
 839 }
 840
 841 /* add-inferior [-copies N] [-exec FILENAME]  */
 842
 843 static void
 844 add_inferior_command (char *args, int from_tty)
 845 {
 846   int i, copies = 1;
 847   char *exec = NULL;
 848   char **argv;
 849   symfile_add_flags add_flags = 0;
 850   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 851
 852   if (from_tty)
 853     add_flags |= SYMFILE_VERBOSE;
 854
 855   if (args)
 856     {
 857       argv = gdb_buildargv (args);
 858       make_cleanup_freeargv (argv);
 859
 860       for (; *argv != NULL; argv++)
 861         {
 862           if (**argv == '-')
 863             {
 864               if (strcmp (*argv, "-copies") == 0)
 865                 {
 866                   ++argv;
 867                   if (!*argv)
 868                     error (_("No argument to -copies"));
 869                   copies = parse_and_eval_long (*argv);
 870                 }
 871               else if (strcmp (*argv, "-exec") == 0)
 872                 {
 873                   ++argv;
 874                   if (!*argv)
 875                     error (_("No argument to -exec"));
 876                   exec = tilde_expand (*argv);
 877                   make_cleanup (xfree, exec);
 878                 }
 879             }
 880           else
 881             error (_("Invalid argument"));
 882         }
 883     }
 884
 885   save_current_space_and_thread ();
 886
 887   for (i = 0; i < copies; ++i)
 888     {
 889       struct inferior *inf = add_inferior_with_spaces ();
 890
 891       printf_filtered (_("Added inferior %d\n"), inf->num);
 892
 893       if (exec != NULL)
 894         {
 895           /* Switch over temporarily, while reading executable and
 896              symbols.q.  */
 897           set_current_program_space (inf->pspace);
 898           set_current_inferior (inf);
 899           switch_to_thread (null_ptid);
 900
 901           exec_file_attach (exec, from_tty);
 902           symbol_file_add_main (exec, add_flags);
 903         }
 904     }
 905
 906   do_cleanups (old_chain);
 907 }
 908
 909 /* clone-inferior [-copies N] [ID] */
 910
 911 static void
 912 clone_inferior_command (char *args, int from_tty)
 913 {
 914   int i, copies = 1;
 915   char **argv;
 916   struct inferior *orginf = NULL;
 917   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 918
 919   if (args)
 920     {
 921       argv = gdb_buildargv (args);
 922       make_cleanup_freeargv (argv);
 923
 924       for (; *argv != NULL; argv++)
 925         {
 926           if (**argv == '-')
 927             {
 928               if (strcmp (*argv, "-copies") == 0)
 929                 {
 930                   ++argv;
 931                   if (!*argv)
 932                     error (_("No argument to -copies"));
 933                   copies = parse_and_eval_long (*argv);
 934
 935                   if (copies < 0)
 936                     error (_("Invalid copies number"));
 937                 }
 938             }
 939           else
 940             {
 941               if (orginf == NULL)
 942                 {
 943                   int num;
 944
 945                   /* The first non-option (-) argument specified the
 946                      program space ID.  */
 947                   num = parse_and_eval_long (*argv);
 948                   orginf = find_inferior_id (num);
 949
 950                   if (orginf == NULL)
 951                     error (_("Inferior ID %d not known."), num);
 952                   continue;
 953                 }
 954               else
 955                 error (_("Invalid argument"));
 956             }
 957         }
 958     }
 959
 960   /* If no inferior id was specified, then the user wants to clone the
 961      current inferior.  */
 962   if (orginf == NULL)
 963     orginf = current_inferior ();
 964
 965   save_current_space_and_thread ();
 966
 967   for (i = 0; i < copies; ++i)
 968     {
 969       struct address_space *aspace;
 970       struct program_space *pspace;
 971       struct inferior *inf;
 972
 973       /* If all inferiors share an address space on this system, this
 974          doesn't really return a new address space; otherwise, it
 975          really does.  */
 976       aspace = maybe_new_address_space ();
 977       pspace = add_program_space (aspace);
 978       inf = add_inferior (0);
 979       inf->pspace = pspace;
 980       inf->aspace = pspace->aspace;
 981       inf->gdbarch = orginf->gdbarch;
 982
 983       /* If the original inferior had a user specified target
 984          description, make the clone use it too.  */
 985       if (target_desc_info_from_user_p (inf->tdesc_info))
 986         copy_inferior_target_desc_info (inf, orginf);
 987
 988       printf_filtered (_("Added inferior %d.\n"), inf->num);
 989
 990       set_current_inferior (inf);
 991       switch_to_thread (null_ptid);
 992       clone_program_space (pspace, orginf->pspace);
 993     }
 994
 995   do_cleanups (old_chain);
 996 }
 997
 998 /* Print notices when new inferiors are created and die.  */
 999 static void
1000 show_print_inferior_events (struct ui_file *file, int from_tty,
1001                            struct cmd_list_element *c, const char *value)
1002 {
1003   fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
1004 }
1005
1006 /* Return a new value for the selected inferior's id.  */
1007
1008 static struct value *
1009 inferior_id_make_value (struct gdbarch *gdbarch, struct internalvar *var,
1010                         void *ignore)
1011 {
1012   struct inferior *inf = current_inferior ();
1013
1014   return value_from_longest (builtin_type (gdbarch)->builtin_int, inf->num);
1015 }
1016
1017 /* Implementation of `$_inferior' variable.  */
1018
1019 static const struct internalvar_funcs inferior_funcs =
1020 {
1021   inferior_id_make_value,
1022   NULL,
1023   NULL
1024 };
1025
1026 \f
1027
1028 void
1029 initialize_inferiors (void)
1030 {
1031   struct cmd_list_element *c = NULL;
1032
1033   /* There's always one inferior.  Note that this function isn't an
1034      automatic _initialize_foo function, since other _initialize_foo
1035      routines may need to install their per-inferior data keys.  We
1036      can only allocate an inferior when all those modules have done
1037      that.  Do this after initialize_progspace, due to the
1038      current_program_space reference.  */
1039   current_inferior_ = add_inferior (0);
1040   current_inferior_->pspace = current_program_space;
1041   current_inferior_->aspace = current_program_space->aspace;
1042   /* The architecture will be initialized shortly, by
1043      initialize_current_architecture.  */
1044
1045   add_info ("inferiors", info_inferiors_command,
1046             _("IDs of specified inferiors (all inferiors if no argument)."));
1047
1048   c = add_com ("add-inferior", no_class, add_inferior_command, _("\
1049 Add a new inferior.\n\
1050 Usage: add-inferior [-copies <N>] [-exec <FILENAME>]\n\
1051 N is the optional number of inferiors to add, default is 1.\n\
1052 FILENAME is the file name of the executable to use\n\
1053 as main program."));
1054   set_cmd_completer (c, filename_completer);
1055
1056   add_com ("remove-inferiors", no_class, remove_inferior_command, _("\
1057 Remove inferior ID (or list of IDs).\n\
1058 Usage: remove-inferiors ID..."));
1059
1060   add_com ("clone-inferior", no_class, clone_inferior_command, _("\
1061 Clone inferior ID.\n\
1062 Usage: clone-inferior [-copies <N>] [ID]\n\
1063 Add N copies of inferior ID.  The new inferior has the same\n\
1064 executable loaded as the copied inferior.  If -copies is not specified,\n\
1065 adds 1 copy.  If ID is not specified, it is the current inferior\n\
1066 that is cloned."));
1067
1068   add_cmd ("inferiors", class_run, detach_inferior_command, _("\
1069 Detach from inferior ID (or list of IDS)."),
1070            &detachlist);
1071
1072   add_cmd ("inferiors", class_run, kill_inferior_command, _("\
1073 Kill inferior ID (or list of IDs)."),
1074            &killlist);
1075
1076   add_cmd ("inferior", class_run, inferior_command, _("\
1077 Use this command to switch between inferiors.\n\
1078 The new inferior ID must be currently known."),
1079            &cmdlist);
1080
1081   add_setshow_boolean_cmd ("inferior-events", no_class,
1082          &print_inferior_events, _("\
1083 Set printing of inferior events (e.g., inferior start and exit)."), _("\
1084 Show printing of inferior events (e.g., inferior start and exit)."), NULL,
1085          NULL,
1086          show_print_inferior_events,
1087          &setprintlist, &showprintlist);
1088
1089   create_internalvar_type_lazy ("_inferior", &inferior_funcs, NULL);
1090 }