gdb/inferior.c

   1 /* Multi-process control for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008, 2009 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 "inferior.h"
  22 #include "target.h"
  23 #include "command.h"
  24 #include "gdbcmd.h"
  25 #include "gdbthread.h"
  26 #include "ui-out.h"
  27 #include "observer.h"
  28
  29 void _initialize_inferiors (void);
  30
  31 static struct inferior *inferior_list = NULL;
  32 static int highest_inferior_num;
  33
  34 /* Print notices on inferior events (attach, detach, etc.), set with
  35    `set print inferior-events'.  */
  36 static int print_inferior_events = 0;
  37
  38 struct inferior*
  39 current_inferior (void)
  40 {
  41   struct inferior *inf = find_inferior_pid (ptid_get_pid (inferior_ptid));
  42   gdb_assert (inf);
  43   return inf;
  44 }
  45
  46 static void
  47 free_inferior (struct inferior *inf)
  48 {
  49   discard_all_inferior_continuations (inf);
  50   xfree (inf->private);
  51   xfree (inf);
  52 }
  53
  54 void
  55 init_inferior_list (void)
  56 {
  57   struct inferior *inf, *infnext;
  58
  59   highest_inferior_num = 0;
  60   if (!inferior_list)
  61     return;
  62
  63   for (inf = inferior_list; inf; inf = infnext)
  64     {
  65       infnext = inf->next;
  66       free_inferior (inf);
  67     }
  68
  69   inferior_list = NULL;
  70 }
  71
  72 struct inferior *
  73 add_inferior_silent (int pid)
  74 {
  75   struct inferior *inf;
  76
  77   inf = xmalloc (sizeof (*inf));
  78   memset (inf, 0, sizeof (*inf));
  79   inf->pid = pid;
  80
  81   inf->stop_soon = NO_STOP_QUIETLY;
  82
  83   inf->num = ++highest_inferior_num;
  84   inf->next = inferior_list;
  85   inferior_list = inf;
  86
  87   return inf;
  88 }
  89
  90 struct inferior *
  91 add_inferior (int pid)
  92 {
  93   struct inferior *inf = add_inferior_silent (pid);
  94
  95   observer_notify_new_inferior (pid);
  96
  97   if (print_inferior_events)
  98     printf_unfiltered (_("[New inferior %d]\n"), pid);
  99
 100   return inf;
 101 }
 102
 103 struct delete_thread_of_inferior_arg
 104 {
 105   int pid;
 106   int silent;
 107 };
 108
 109 static int
 110 delete_thread_of_inferior (struct thread_info *tp, void *data)
 111 {
 112   struct delete_thread_of_inferior_arg *arg = data;
 113
 114   if (ptid_get_pid (tp->ptid) == arg->pid)
 115     {
 116       if (arg->silent)
 117         delete_thread_silent (tp->ptid);
 118       else
 119         delete_thread (tp->ptid);
 120     }
 121
 122   return 0;
 123 }
 124
 125 /* If SILENT then be quiet -- don't announce a inferior death, or the
 126    exit of its threads.  */
 127 static void
 128 delete_inferior_1 (int pid, int silent)
 129 {
 130   struct inferior *inf, *infprev;
 131   struct delete_thread_of_inferior_arg arg = { pid, silent };
 132
 133   infprev = NULL;
 134
 135   for (inf = inferior_list; inf; infprev = inf, inf = inf->next)
 136     if (inf->pid == pid)
 137       break;
 138
 139   if (!inf)
 140     return;
 141
 142   if (infprev)
 143     infprev->next = inf->next;
 144   else
 145     inferior_list = inf->next;
 146
 147   free_inferior (inf);
 148
 149   arg.pid = pid;
 150   arg.silent = silent;
 151
 152   iterate_over_threads (delete_thread_of_inferior, &arg);
 153
 154   observer_notify_inferior_exit (pid);
 155 }
 156
 157 void
 158 delete_inferior (int pid)
 159 {
 160   delete_inferior_1 (pid, 0);
 161
 162   if (print_inferior_events)
 163     printf_unfiltered (_("[Inferior %d exited]\n"), pid);
 164 }
 165
 166 void
 167 delete_inferior_silent (int pid)
 168 {
 169   delete_inferior_1 (pid, 1);
 170 }
 171
 172 void
 173 detach_inferior (int pid)
 174 {
 175   delete_inferior_1 (pid, 1);
 176
 177   if (print_inferior_events)
 178     printf_unfiltered (_("[Inferior %d detached]\n"), pid);
 179 }
 180
 181 void
 182 discard_all_inferiors (void)
 183 {
 184   struct inferior *inf, *infnext;
 185
 186   for (inf = inferior_list; inf; inf = infnext)
 187     {
 188       infnext = inf->next;
 189       delete_inferior_silent (inf->pid);
 190     }
 191 }
 192
 193 static struct inferior *
 194 find_inferior_id (int num)
 195 {
 196   struct inferior *inf;
 197
 198   for (inf = inferior_list; inf; inf = inf->next)
 199     if (inf->num == num)
 200       return inf;
 201
 202   return NULL;
 203 }
 204
 205 struct inferior *
 206 find_inferior_pid (int pid)
 207 {
 208   struct inferior *inf;
 209
 210   for (inf = inferior_list; inf; inf = inf->next)
 211     if (inf->pid == pid)
 212       return inf;
 213
 214   return NULL;
 215 }
 216
 217 struct inferior *
 218 iterate_over_inferiors (int (*callback) (struct inferior *, void *),
 219                         void *data)
 220 {
 221   struct inferior *inf, *infnext;
 222
 223   for (inf = inferior_list; inf; inf = infnext)
 224     {
 225       infnext = inf->next;
 226       if ((*callback) (inf, data))
 227         return inf;
 228     }
 229
 230   return NULL;
 231 }
 232
 233 int
 234 valid_gdb_inferior_id (int num)
 235 {
 236   struct inferior *inf;
 237
 238   for (inf = inferior_list; inf; inf = inf->next)
 239     if (inf->num == num)
 240       return 1;
 241
 242   return 0;
 243 }
 244
 245 int
 246 pid_to_gdb_inferior_id (int pid)
 247 {
 248   struct inferior *inf;
 249
 250   for (inf = inferior_list; inf; inf = inf->next)
 251     if (inf->pid == pid)
 252       return inf->num;
 253
 254   return 0;
 255 }
 256
 257 int
 258 gdb_inferior_id_to_pid (int num)
 259 {
 260   struct inferior *inferior = find_inferior_id (num);
 261   if (inferior)
 262     return inferior->pid;
 263   else
 264     return -1;
 265 }
 266
 267 int
 268 in_inferior_list (int pid)
 269 {
 270   struct inferior *inf;
 271
 272   for (inf = inferior_list; inf; inf = inf->next)
 273     if (inf->pid == pid)
 274       return 1;
 275
 276   return 0;
 277 }
 278
 279 int
 280 have_inferiors (void)
 281 {
 282   return inferior_list != NULL;
 283 }
 284
 285 /* Prints the list of inferiors and their details on UIOUT.  This is a
 286    version of 'info_inferior_command' suitable for use from MI.
 287
 288    If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior that
 289    should be printed.  Otherwise, all inferiors are printed.  */
 290 void
 291 print_inferior (struct ui_out *uiout, int requested_inferior)
 292 {
 293   struct inferior *inf;
 294   struct cleanup *old_chain;
 295
 296   old_chain = make_cleanup_ui_out_list_begin_end (uiout, "inferiors");
 297
 298   for (inf = inferior_list; inf; inf = inf->next)
 299     {
 300       struct cleanup *chain2;
 301
 302       if (requested_inferior != -1 && inf->num != requested_inferior)
 303         continue;
 304
 305       chain2 = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 306
 307       if (inf->pid == ptid_get_pid (inferior_ptid))
 308         ui_out_text (uiout, "* ");
 309       else
 310         ui_out_text (uiout, "  ");
 311
 312       ui_out_field_int (uiout, "id", inf->num);
 313       ui_out_text (uiout, " ");
 314       ui_out_field_int (uiout, "target-id", inf->pid);
 315
 316       ui_out_text (uiout, "\n");
 317       do_cleanups (chain2);
 318     }
 319
 320   do_cleanups (old_chain);
 321 }
 322
 323 /* Print information about currently known inferiors.  */
 324
 325 static void
 326 info_inferiors_command (char *arg, int from_tty)
 327 {
 328   print_inferior (uiout, -1);
 329 }
 330
 331 /* Print notices when new inferiors are created and die.  */
 332 static void
 333 show_print_inferior_events (struct ui_file *file, int from_tty,
 334                            struct cmd_list_element *c, const char *value)
 335 {
 336   fprintf_filtered (file, _("Printing of inferior events is %s.\n"), value);
 337 }
 338
 339 void
 340 _initialize_inferiors (void)
 341 {
 342   add_info ("inferiors", info_inferiors_command,
 343             _("IDs of currently known inferiors."));
 344
 345   add_setshow_boolean_cmd ("inferior-events", no_class,
 346          &print_inferior_events, _("\
 347 Set printing of inferior events (e.g., inferior start and exit)."), _("\
 348 Show printing of inferior events (e.g., inferior start and exit)."), NULL,
 349          NULL,
 350          show_print_inferior_events,
 351          &setprintlist, &showprintlist);
 352 }