gdb/inferior.c

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