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