gdb/inferior.c

   1 /* Multi-process control for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2012 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
  37 void _initialize_inferiors (void);
  38
  39 /* Keep a registry of per-inferior data-pointers required by other GDB
  40    modules.  */
  41
  42 DEFINE_REGISTRY (inferior, REGISTRY_ACCESS_FIELD)
  43
  44 struct inferior *inferior_list = NULL;
  45 static int highest_inferior_num;
  46
  47 /* Print notices on inferior events (attach, detach, etc.), set with
  48    `set print inferior-events'.  */
  49 static int print_inferior_events = 0;
  50
  51 /* The Current Inferior.  */
  52 static struct inferior *current_inferior_ = NULL;
  53
  54 struct inferior*
  55 current_inferior (void)
  56 {
  57   return current_inferior_;
  58 }
  59
  60 void
  61 set_current_inferior (struct inferior *inf)
  62 {
  63   /* There's always an inferior.  */
  64   gdb_assert (inf != NULL);
  65
  66   current_inferior_ = inf;
  67 }
  68
  69 /* A cleanups callback, helper for save_current_program_space
  70    below.  */
  71
  72 static void
  73 restore_inferior (void *arg)
  74 {
  75   struct inferior *saved_inferior = arg;
  76
  77   set_current_inferior (saved_inferior);
  78 }
  79
  80 /* Save the current program space so that it may be restored by a later
  81    call to do_cleanups.  Returns the struct cleanup pointer needed for
  82    later doing the cleanup.  */
  83
  84 struct cleanup *
  85 save_current_inferior (void)
  86 {
  87   struct cleanup *old_chain = make_cleanup (restore_inferior,
  88                                             current_inferior_);
  89
  90   return old_chain;
  91 }
  92
  93 static void
  94 free_inferior (struct inferior *inf)
  95 {
  96   discard_all_inferior_continuations (inf);
  97   inferior_free_data (inf);
  98   xfree (inf->args);
  99   xfree (inf->terminal);
 100   free_environ (inf->environment);
 101   xfree (inf->private);
 102   xfree (inf);
 103 }
 104
 105 void
 106 init_inferior_list (void)
 107 {
 108   struct inferior *inf, *infnext;
 109
 110   highest_inferior_num = 0;
 111   if (!inferior_list)
 112     return;
 113
 114   for (inf = inferior_list; inf; inf = infnext)
 115     {
 116       infnext = inf->next;
 117       free_inferior (inf);
 118     }
 119
 120   inferior_list = NULL;
 121 }
 122
 123 struct inferior *
 124 add_inferior_silent (int pid)
 125 {
 126   struct inferior *inf;
 127
 128   inf = xmalloc (sizeof (*inf));
 129   memset (inf, 0, sizeof (*inf));
 130   inf->pid = pid;
 131
 132   inf->control.stop_soon = NO_STOP_QUIETLY;
 133
 134   inf->num = ++highest_inferior_num;
 135   inf->next = inferior_list;
 136   inferior_list = inf;
 137
 138   inf->environment = make_environ ();
 139   init_environ (inf->environment);
 140
 141   inferior_alloc_data (inf);
 142
 143   observer_notify_inferior_added (inf);
 144
 145   if (pid != 0)
 146     inferior_appeared (inf, pid);
 147
 148   return inf;
 149 }
 150
 151 struct inferior *
 152 add_inferior (int pid)
 153 {
 154   struct inferior *inf = add_inferior_silent (pid);
 155
 156   if (print_inferior_events)
 157     printf_unfiltered (_("[New inferior %d]\n"), pid);
 158
 159   return inf;
 160 }
 161
 162 struct delete_thread_of_inferior_arg
 163 {
 164   int pid;
 165   int silent;
 166 };
 167
 168 static int
 169 delete_thread_of_inferior (struct thread_info *tp, void *data)
 170 {
 171   struct delete_thread_of_inferior_arg *arg = data;
 172
 173   if (ptid_get_pid (tp->ptid) == arg->pid)
 174     {
 175       if (arg->silent)
 176         delete_thread_silent (tp->ptid);
 177       else
 178         delete_thread (tp->ptid);
 179     }
 180
 181   return 0;
 182 }
 183
 184 /* If SILENT then be quiet -- don't announce a inferior death, or the
 185    exit of its threads.  */
 186
 187 void
 188 delete_inferior_1 (struct inferior *todel, int silent)
 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 = silent;
 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   free_inferior (inf);
 215 }
 216
 217 void
 218 delete_inferior (int pid)
 219 {
 220   struct inferior *inf = find_inferior_pid (pid);
 221
 222   delete_inferior_1 (inf, 0);
 223
 224   if (print_inferior_events)
 225     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 226 }
 227
 228 void
 229 delete_inferior_silent (int pid)
 230 {
 231   struct inferior *inf = find_inferior_pid (pid);
 232
 233   delete_inferior_1 (inf, 1);
 234 }
 235
 236
 237 /* If SILENT then be quiet -- don't announce a inferior exit, or the
 238    exit of its threads.  */
 239
 240 static void
 241 exit_inferior_1 (struct inferior *inftoex, int silent)
 242 {
 243   struct inferior *inf;
 244   struct delete_thread_of_inferior_arg arg;
 245
 246   for (inf = inferior_list; inf; inf = inf->next)
 247     if (inf == inftoex)
 248       break;
 249
 250   if (!inf)
 251     return;
 252
 253   arg.pid = inf->pid;
 254   arg.silent = silent;
 255
 256   iterate_over_threads (delete_thread_of_inferior, &arg);
 257
 258   /* Notify the observers before removing the inferior from the list,
 259      so that the observers have a chance to look it up.  */
 260   observer_notify_inferior_exit (inf);
 261
 262   inf->pid = 0;
 263   inf->fake_pid_p = 0;
 264   if (inf->vfork_parent != NULL)
 265     {
 266       inf->vfork_parent->vfork_child = NULL;
 267       inf->vfork_parent = NULL;
 268     }
 269   if (inf->vfork_child != NULL)
 270     {
 271       inf->vfork_child->vfork_parent = NULL;
 272       inf->vfork_child = NULL;
 273     }
 274
 275   inf->has_exit_code = 0;
 276   inf->exit_code = 0;
 277   inf->pending_detach = 0;
 278 }
 279
 280 void
 281 exit_inferior (int pid)
 282 {
 283   struct inferior *inf = find_inferior_pid (pid);
 284
 285   exit_inferior_1 (inf, 0);
 286
 287   if (print_inferior_events)
 288     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 289 }
 290
 291 void
 292 exit_inferior_silent (int pid)
 293 {
 294   struct inferior *inf = find_inferior_pid (pid);
 295
 296   exit_inferior_1 (inf, 1);
 297 }
 298
 299 void
 300 exit_inferior_num_silent (int num)
 301 {
 302   struct inferior *inf = find_inferior_id (num);
 303
 304   exit_inferior_1 (inf, 1);
 305 }
 306
 307 void
 308 detach_inferior (int pid)
 309 {
 310   struct inferior *inf = find_inferior_pid (pid);
 311
 312   exit_inferior_1 (inf, 1);
 313
 314   if (print_inferior_events)
 315     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
 316 }
 317
 318 void
 319 inferior_appeared (struct inferior *inf, int pid)
 320 {
 321   inf->pid = pid;
 322
 323   observer_notify_inferior_appeared (inf);
 324 }
 325
 326 void
 327 discard_all_inferiors (void)
 328 {
 329   struct inferior *inf;
 330
 331   for (inf = inferior_list; inf; inf = inf->next)
 332     {
 333       if (inf->pid != 0)
 334         exit_inferior_silent (inf->pid);
 335     }
 336 }
 337
 338 struct inferior *
 339 find_inferior_id (int num)
 340 {
 341   struct inferior *inf;
 342
 343   for (inf = inferior_list; inf; inf = inf->next)
 344     if (inf->num == num)
 345       return inf;
 346
 347   return NULL;
 348 }
 349
 350 struct inferior *
 351 find_inferior_pid (int pid)
 352 {
 353   struct inferior *inf;
 354
 355   /* Looking for inferior pid == 0 is always wrong, and indicative of
 356      a bug somewhere else.  There may be more than one with pid == 0,
 357      for instance.  */
 358   gdb_assert (pid != 0);
 359
 360   for (inf = inferior_list; inf; inf = inf->next)
 361     if (inf->pid == pid)
 362       return inf;
 363
 364   return NULL;
 365 }
 366
 367 /* Find an inferior bound to PSPACE.  */
 368
 369 struct inferior *
 370 find_inferior_for_program_space (struct program_space *pspace)
 371 {
 372   struct inferior *inf;
 373
 374   for (inf = inferior_list; inf != NULL; inf = inf->next)
 375     {
 376       if (inf->pspace == pspace)
 377         return inf;
 378     }
 379
 380   return NULL;
 381 }
 382
 383 struct inferior *
 384 iterate_over_inferiors (int (*callback) (struct inferior *, void *),
 385                         void *data)
 386 {
 387   struct inferior *inf, *infnext;
 388
 389   for (inf = inferior_list; inf; inf = infnext)
 390     {
 391       infnext = inf->next;
 392       if ((*callback) (inf, data))
 393         return inf;
 394     }
 395
 396   return NULL;
 397 }
 398
 399 int
 400 valid_gdb_inferior_id (int num)
 401 {
 402   struct inferior *inf;
 403
 404   for (inf = inferior_list; inf; inf = inf->next)
 405     if (inf->num == num)
 406       return 1;
 407
 408   return 0;
 409 }
 410
 411 int
 412 pid_to_gdb_inferior_id (int pid)
 413 {
 414   struct inferior *inf;
 415
 416   for (inf = inferior_list; inf; inf = inf->next)
 417     if (inf->pid == pid)
 418       return inf->num;
 419
 420   return 0;
 421 }
 422
 423 int
 424 gdb_inferior_id_to_pid (int num)
 425 {
 426   struct inferior *inferior = find_inferior_id (num);
 427   if (inferior)
 428     return inferior->pid;
 429   else
 430     return -1;
 431 }
 432
 433 int
 434 in_inferior_list (int pid)
 435 {
 436   struct inferior *inf;
 437
 438   for (inf = inferior_list; inf; inf = inf->next)
 439     if (inf->pid == pid)
 440       return 1;
 441
 442   return 0;
 443 }
 444
 445 int
 446 have_inferiors (void)
 447 {
 448   struct inferior *inf;
 449
 450   for (inf = inferior_list; inf; inf = inf->next)
 451     if (inf->pid != 0)
 452       return 1;
 453
 454   return 0;
 455 }
 456
 457 int
 458 have_live_inferiors (void)
 459 {
 460   struct inferior *inf;
 461
 462   for (inf = inferior_list; inf; inf = inf->next)
 463     if (inf->pid != 0)
 464       {
 465         struct thread_info *tp;
 466
 467         tp = any_thread_of_process (inf->pid);
 468         if (tp && target_has_execution_1 (tp->ptid))
 469           break;
 470       }
 471
 472   return inf != NULL;
 473 }
 474
 475 /* Prune away automatically added program spaces that aren't required
 476    anymore.  */
 477
 478 void
 479 prune_inferiors (void)
 480 {
 481   struct inferior *ss, **ss_link;
 482   struct inferior *current = current_inferior ();
 483
 484   ss = inferior_list;
 485   ss_link = &inferior_list;
 486   while (ss)
 487     {
 488       if (ss == current
 489           || !ss->removable
 490           || ss->pid != 0)
 491         {
 492           ss_link = &ss->next;
 493           ss = *ss_link;
 494           continue;
 495         }
 496
 497       *ss_link = ss->next;
 498       delete_inferior_1 (ss, 1);
 499       ss = *ss_link;
 500     }
 501
 502   prune_program_spaces ();
 503 }
 504
 505 /* Simply returns the count of inferiors.  */
 506
 507 int
 508 number_of_inferiors (void)
 509 {
 510   struct inferior *inf;
 511   int count = 0;
 512
 513   for (inf = inferior_list; inf != NULL; inf = inf->next)
 514     count++;
 515
 516   return count;
 517 }
 518
 519 /* Converts an inferior process id to a string.  Like
 520    target_pid_to_str, but special cases the null process.  */
 521
 522 static char *
 523 inferior_pid_to_str (int pid)
 524 {
 525   if (pid != 0)
 526     return target_pid_to_str (pid_to_ptid (pid));
 527   else
 528     return _("<null>");
 529 }
 530
 531 /* Prints the list of inferiors and their details on UIOUT.  This is a
 532    version of 'info_inferior_command' suitable for use from MI.
 533
 534    If REQUESTED_INFERIORS is not NULL, it's a list of GDB ids of the
 535    inferiors that should be printed.  Otherwise, all inferiors are
 536    printed.  */
 537
 538 static void
 539 print_inferior (struct ui_out *uiout, char *requested_inferiors)
 540 {
 541   struct inferior *inf;
 542   struct cleanup *old_chain;
 543   int inf_count = 0;
 544
 545   /* Compute number of inferiors we will print.  */
 546   for (inf = inferior_list; inf; inf = inf->next)
 547     {
 548       if (!number_is_in_list (requested_inferiors, inf->num))
 549         continue;
 550
 551       ++inf_count;
 552     }
 553
 554   if (inf_count == 0)
 555     {
 556       ui_out_message (uiout, 0, "No inferiors.\n");
 557       return;
 558     }
 559
 560   old_chain = make_cleanup_ui_out_table_begin_end (uiout, 4, inf_count,
 561                                                    "inferiors");
 562   ui_out_table_header (uiout, 1, ui_left, "current", "");
 563   ui_out_table_header (uiout, 4, ui_left, "number", "Num");
 564   ui_out_table_header (uiout, 17, ui_left, "target-id", "Description");
 565   ui_out_table_header (uiout, 17, ui_left, "exec", "Executable");
 566
 567   ui_out_table_body (uiout);
 568   for (inf = inferior_list; inf; inf = inf->next)
 569     {
 570       struct cleanup *chain2;
 571
 572       if (!number_is_in_list (requested_inferiors, inf->num))
 573         continue;
 574
 575       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 576
 577       if (inf == current_inferior ())
 578         ui_out_field_string (uiout, "current", "*");
 579       else
 580         ui_out_field_skip (uiout, "current");
 581
 582       ui_out_field_int (uiout, "number", inf->num);
 583
 584       ui_out_field_string (uiout, "target-id",
 585                            inferior_pid_to_str (inf->pid));
 586
 587       if (inf->pspace->ebfd)
 588         ui_out_field_string (uiout, "exec",
 589                              bfd_get_filename (inf->pspace->ebfd));
 590       else
 591         ui_out_field_skip (uiout, "exec");
 592
 593       /* Print extra info that isn't really fit to always present in
 594          tabular form.  Currently we print the vfork parent/child
 595          relationships, if any.  */
 596       if (inf->vfork_parent)
 597         {
 598           ui_out_text (uiout, _("\n\tis vfork child of inferior "));
 599           ui_out_field_int (uiout, "vfork-parent", inf->vfork_parent->num);
 600         }
 601       if (inf->vfork_child)
 602         {
 603           ui_out_text (uiout, _("\n\tis vfork parent of inferior "));
 604           ui_out_field_int (uiout, "vfork-child", inf->vfork_child->num);
 605         }
 606
 607       ui_out_text (uiout, "\n");
 608       do_cleanups (chain2);
 609     }
 610
 611   do_cleanups (old_chain);
 612 }
 613
 614 static void
 615 detach_inferior_command (char *args, int from_tty)
 616 {
 617   int num, pid;
 618   struct thread_info *tp;
 619   struct get_number_or_range_state state;
 620
 621   if (!args || !*args)
 622     error (_("Requires argument (inferior id(s) to detach)"));
 623
 624   init_number_or_range (&state, args);
 625   while (!state.finished)
 626     {
 627       num = get_number_or_range (&state);
 628
 629       if (!valid_gdb_inferior_id (num))
 630         {
 631           warning (_("Inferior ID %d not known."), num);
 632           continue;
 633         }
 634
 635       pid = gdb_inferior_id_to_pid (num);
 636
 637       tp = any_thread_of_process (pid);
 638       if (!tp)
 639         {
 640           warning (_("Inferior ID %d has no threads."), num);
 641           continue;
 642         }
 643
 644       switch_to_thread (tp->ptid);
 645
 646       detach_command (NULL, from_tty);
 647     }
 648 }
 649
 650 static void
 651 kill_inferior_command (char *args, int from_tty)
 652 {
 653   int num, pid;
 654   struct thread_info *tp;
 655   struct get_number_or_range_state state;
 656
 657   if (!args || !*args)
 658     error (_("Requires argument (inferior id(s) to kill)"));
 659
 660   init_number_or_range (&state, args);
 661   while (!state.finished)
 662     {
 663       num = get_number_or_range (&state);
 664
 665       if (!valid_gdb_inferior_id (num))
 666         {
 667           warning (_("Inferior ID %d not known."), num);
 668           continue;
 669         }
 670
 671       pid = gdb_inferior_id_to_pid (num);
 672
 673       tp = any_thread_of_process (pid);
 674       if (!tp)
 675         {
 676           warning (_("Inferior ID %d has no threads."), num);
 677           continue;
 678         }
 679
 680       switch_to_thread (tp->ptid);
 681
 682       target_kill ();
 683     }
 684
 685   bfd_cache_close_all ();
 686 }
 687
 688 static void
 689 inferior_command (char *args, int from_tty)
 690 {
 691   struct inferior *inf;
 692   int num;
 693
 694   num = parse_and_eval_long (args);
 695
 696   inf = find_inferior_id (num);
 697   if (inf == NULL)
 698     error (_("Inferior ID %d not known."), num);
 699
 700   printf_filtered (_("[Switching to inferior %d [%s] (%s)]\n"),
 701                    inf->num,
 702                    inferior_pid_to_str (inf->pid),
 703                    (inf->pspace->ebfd
 704                     ? bfd_get_filename (inf->pspace->ebfd)
 705                     : _("<noexec>")));
 706
 707   if (inf->pid != 0)
 708     {
 709       if (inf->pid != ptid_get_pid (inferior_ptid))
 710         {
 711           struct thread_info *tp;
 712
 713           tp = any_thread_of_process (inf->pid);
 714           if (!tp)
 715             error (_("Inferior has no threads."));
 716
 717           switch_to_thread (tp->ptid);
 718         }
 719
 720       printf_filtered (_("[Switching to thread %d (%s)] "),
 721                        pid_to_thread_id (inferior_ptid),
 722                        target_pid_to_str (inferior_ptid));
 723     }
 724   else
 725     {
 726       struct inferior *inf;
 727
 728       inf = find_inferior_id (num);
 729       set_current_inferior (inf);
 730       switch_to_thread (null_ptid);
 731       set_current_program_space (inf->pspace);
 732     }
 733
 734   if (inf->pid != 0 && is_running (inferior_ptid))
 735     ui_out_text (current_uiout, "(running)\n");
 736   else if (inf->pid != 0)
 737     {
 738       ui_out_text (current_uiout, "\n");
 739       print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
 740     }
 741 }
 742
 743 /* Print information about currently known inferiors.  */
 744
 745 static void
 746 info_inferiors_command (char *args, int from_tty)
 747 {
 748   print_inferior (current_uiout, args);
 749 }
 750
 751 /* remove-inferior ID */
 752
 753 static void
 754 remove_inferior_command (char *args, int from_tty)
 755 {
 756   int num;
 757   struct inferior *inf;
 758   struct get_number_or_range_state state;
 759
 760   if (args == NULL || *args == '\0')
 761     error (_("Requires an argument (inferior id(s) to remove)"));
 762
 763   init_number_or_range (&state, args);
 764   while (!state.finished)
 765     {
 766       num = get_number_or_range (&state);
 767       inf = find_inferior_id (num);
 768
 769       if (inf == NULL)
 770         {
 771           warning (_("Inferior ID %d not known."), num);
 772           continue;
 773         }
 774
 775       if (inf == current_inferior ())
 776         {
 777           warning (_("Can not remove current symbol inferior %d."), num);
 778           continue;
 779         }
 780
 781       if (inf->pid != 0)
 782         {
 783           warning (_("Can not remove active inferior %d."), num);
 784           continue;
 785         }
 786
 787       delete_inferior_1 (inf, 1);
 788     }
 789 }
 790
 791 struct inferior *
 792 add_inferior_with_spaces (void)
 793 {
 794   struct address_space *aspace;
 795   struct program_space *pspace;
 796   struct inferior *inf;
 797
 798   /* If all inferiors share an address space on this system, this
 799      doesn't really return a new address space; otherwise, it
 800      really does.  */
 801   aspace = maybe_new_address_space ();
 802   pspace = add_program_space (aspace);
 803   inf = add_inferior (0);
 804   inf->pspace = pspace;
 805   inf->aspace = pspace->aspace;
 806
 807   return inf;
 808 }
 809
 810 /* add-inferior [-copies N] [-exec FILENAME]  */
 811
 812 static void
 813 add_inferior_command (char *args, int from_tty)
 814 {
 815   int i, copies = 1;
 816   char *exec = NULL;
 817   char **argv;
 818   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 819
 820   if (args)
 821     {
 822       argv = gdb_buildargv (args);
 823       make_cleanup_freeargv (argv);
 824
 825       for (; *argv != NULL; argv++)
 826         {
 827           if (**argv == '-')
 828             {
 829               if (strcmp (*argv, "-copies") == 0)
 830                 {
 831                   ++argv;
 832                   if (!*argv)
 833                     error (_("No argument to -copies"));
 834                   copies = parse_and_eval_long (*argv);
 835                 }
 836               else if (strcmp (*argv, "-exec") == 0)
 837                 {
 838                   ++argv;
 839                   if (!*argv)
 840                     error (_("No argument to -exec"));
 841                   exec = *argv;
 842                 }
 843             }
 844           else
 845             error (_("Invalid argument"));
 846         }
 847     }
 848
 849   save_current_space_and_thread ();
 850
 851   for (i = 0; i < copies; ++i)
 852     {
 853       struct inferior *inf = add_inferior_with_spaces ();
 854
 855       printf_filtered (_("Added inferior %d\n"), inf->num);
 856
 857       if (exec != NULL)
 858         {
 859           /* Switch over temporarily, while reading executable and
 860              symbols.q.  */
 861           set_current_program_space (inf->pspace);
 862           set_current_inferior (inf);
 863           switch_to_thread (null_ptid);
 864
 865           exec_file_attach (exec, from_tty);
 866           symbol_file_add_main (exec, from_tty);
 867         }
 868     }
 869
 870   do_cleanups (old_chain);
 871 }
 872
 873 /* clone-inferior [-copies N] [ID] */
 874
 875 static void
 876 clone_inferior_command (char *args, int from_tty)
 877 {
 878   int i, copies = 1;
 879   char **argv;
 880   struct inferior *orginf = NULL;
 881   struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
 882
 883   if (args)
 884     {
 885       argv = gdb_buildargv (args);
 886       make_cleanup_freeargv (argv);
 887
 888       for (; *argv != NULL; argv++)
 889         {
 890           if (**argv == '-')
 891             {
 892               if (strcmp (*argv, "-copies") == 0)
 893                 {
 894                   ++argv;
 895                   if (!*argv)
 896                     error (_("No argument to -copies"));
 897                   copies = parse_and_eval_long (*argv);
 898
 899                   if (copies < 0)
 900                     error (_("Invalid copies number"));
 901                 }
 902             }
 903           else
 904             {
 905               if (orginf == NULL)
 906                 {
 907                   int num;
 908
 909                   /* The first non-option (-) argument specified the
 910                      program space ID.  */
 911                   num = parse_and_eval_long (*argv);
 912                   orginf = find_inferior_id (num);
 913
 914                   if (orginf == NULL)
 915                     error (_("Inferior ID %d not known."), num);
 916                   continue;
 917                 }
 918               else
 919                 error (_("Invalid argument"));
 920             }
 921         }
 922     }
 923
 924   /* If no inferior id was specified, then the user wants to clone the
 925      current inferior.  */
 926   if (orginf == NULL)
 927     orginf = current_inferior ();
 928
 929   save_current_space_and_thread ();
 930
 931   for (i = 0; i < copies; ++i)
 932     {
 933       struct address_space *aspace;
 934       struct program_space *pspace;
 935       struct inferior *inf;
 936
 937       /* If all inferiors share an address space on this system, this
 938          doesn't really return a new address space; otherwise, it
 939          really does.  */
 940       aspace = maybe_new_address_space ();
 941       pspace = add_program_space (aspace);
 942       inf = add_inferior (0);
 943       inf->pspace = pspace;
 944       inf->aspace = pspace->aspace;
 945
 946       printf_filtered (_("Added inferior %d.\n"), inf->num);
 947
 948       set_current_inferior (inf);
 949       switch_to_thread (null_ptid);
 950       clone_program_space (pspace, orginf->pspace);
 951     }
 952
 953   do_cleanups (old_chain);
 954 }
 955
 956 /* Print notices when new inferiors are created and die.  */
 957 static void
 958 show_print_inferior_events (struct ui_file *file, int from_tty,
 959                            struct cmd_list_element *c, const char *value)
 960 {
 961   fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
 962 }
 963
 964 \f
 965
 966 void
 967 initialize_inferiors (void)
 968 {
 969   struct cmd_list_element *c = NULL;
 970
 971   /* There's always one inferior.  Note that this function isn't an
 972      automatic _initialize_foo function, since other _initialize_foo
 973      routines may need to install their per-inferior data keys.  We
 974      can only allocate an inferior when all those modules have done
 975      that.  Do this after initialize_progspace, due to the
 976      current_program_space reference.  */
 977   current_inferior_ = add_inferior (0);
 978   current_inferior_->pspace = current_program_space;
 979   current_inferior_->aspace = current_program_space->aspace;
 980
 981   add_info ("inferiors", info_inferiors_command,
 982             _("IDs of specified inferiors (all inferiors if no argument)."));
 983
 984   c = add_com ("add-inferior", no_class, add_inferior_command, _("\
 985 Add a new inferior.\n\
 986 Usage: add-inferior [-copies <N>] [-exec <FILENAME>]\n\
 987 N is the optional number of inferiors to add, default is 1.\n\
 988 FILENAME is the file name of the executable to use\n\
 989 as main program."));
 990   set_cmd_completer (c, filename_completer);
 991
 992   add_com ("remove-inferiors", no_class, remove_inferior_command, _("\
 993 Remove inferior ID (or list of IDs).\n\
 994 Usage: remove-inferiors ID..."));
 995
 996   add_com ("clone-inferior", no_class, clone_inferior_command, _("\
 997 Clone inferior ID.\n\
 998 Usage: clone-inferior [-copies <N>] [ID]\n\
 999 Add N copies of inferior ID.  The new inferior has the same\n\
1000 executable loaded as the copied inferior.  If -copies is not specified,\n\
1001 adds 1 copy.  If ID is not specified, it is the current inferior\n\
1002 that is cloned."));
1003
1004   add_cmd ("inferiors", class_run, detach_inferior_command, _("\
1005 Detach from inferior ID (or list of IDS)."),
1006            &detachlist);
1007
1008   add_cmd ("inferiors", class_run, kill_inferior_command, _("\
1009 Kill inferior ID (or list of IDs)."),
1010            &killlist);
1011
1012   add_cmd ("inferior", class_run, inferior_command, _("\
1013 Use this command to switch between inferiors.\n\
1014 The new inferior ID must be currently known."),
1015            &cmdlist);
1016
1017   add_setshow_boolean_cmd ("inferior-events", no_class,
1018          &print_inferior_events, _("\
1019 Set printing of inferior events (e.g., inferior start and exit)."), _("\
1020 Show printing of inferior events (e.g., inferior start and exit)."), NULL,
1021          NULL,
1022          show_print_inferior_events,
1023          &setprintlist, &showprintlist);
1024
1025 }