gdb/inferior.h

   1 /* Variables that describe the inferior process running under GDB:
   2    Where it is, why it stopped, and how to step it.
   3
   4    Copyright (C) 1986-2020 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #if !defined (INFERIOR_H)
  22 #define INFERIOR_H 1
  23
  24 struct target_waitstatus;
  25 struct frame_info;
  26 struct ui_file;
  27 struct type;
  28 struct gdbarch;
  29 struct regcache;
  30 struct ui_out;
  31 struct terminal_info;
  32 struct target_desc_info;
  33 struct continuation;
  34 struct inferior;
  35 struct thread_info;
  36
  37 /* For bpstat.  */
  38 #include "breakpoint.h"
  39
  40 /* For enum gdb_signal.  */
  41 #include "target.h"
  42
  43 /* For struct frame_id.  */
  44 #include "frame.h"
  45
  46 /* For gdb_environ.  */
  47 #include "gdbsupport/environ.h"
  48
  49 #include "progspace.h"
  50 #include "registry.h"
  51
  52 #include "symfile-add-flags.h"
  53 #include "gdbsupport/refcounted-object.h"
  54 #include "gdbsupport/forward-scope-exit.h"
  55 #include "gdbsupport/gdb_unique_ptr.h"
  56
  57 #include "gdbsupport/common-inferior.h"
  58 #include "gdbthread.h"
  59 #include "thread-map.h"
  60
  61 #include "process-stratum-target.h"
  62
  63 struct infcall_suspend_state;
  64 struct infcall_control_state;
  65
  66 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  67 extern void restore_infcall_control_state (struct infcall_control_state *);
  68
  69 /* A deleter for infcall_suspend_state that calls
  70    restore_infcall_suspend_state.  */
  71 struct infcall_suspend_state_deleter
  72 {
  73   void operator() (struct infcall_suspend_state *state) const
  74   {
  75     try
  76       {
  77         restore_infcall_suspend_state (state);
  78       }
  79     catch (const gdb_exception_error &e)
  80       {
  81         /* If we are restoring the inferior state due to an exception,
  82            some error message will be printed.  So, only warn the user
  83            when we cannot restore during normal execution.  */
  84         if (!std::uncaught_exception ())
  85           warning (_("Failed to restore inferior state: %s"), e.what ());
  86       }
  87   }
  88 };
  89
  90 /* A unique_ptr specialization for infcall_suspend_state.  */
  91 typedef std::unique_ptr<infcall_suspend_state, infcall_suspend_state_deleter>
  92     infcall_suspend_state_up;
  93
  94 extern infcall_suspend_state_up save_infcall_suspend_state ();
  95
  96 /* A deleter for infcall_control_state that calls
  97    restore_infcall_control_state.  */
  98 struct infcall_control_state_deleter
  99 {
 100   void operator() (struct infcall_control_state *state) const
 101   {
 102     restore_infcall_control_state (state);
 103   }
 104 };
 105
 106 /* A unique_ptr specialization for infcall_control_state.  */
 107 typedef std::unique_ptr<infcall_control_state, infcall_control_state_deleter>
 108     infcall_control_state_up;
 109
 110 extern infcall_control_state_up save_infcall_control_state ();
 111
 112 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
 113 extern void discard_infcall_control_state (struct infcall_control_state *);
 114
 115 extern readonly_detached_regcache *
 116   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
 117
 118 extern void set_sigint_trap (void);
 119
 120 extern void clear_sigint_trap (void);
 121
 122 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 123    no inferior, inferior_ptid.pid () will be 0.  */
 124
 125 extern ptid_t inferior_ptid;
 126
 127 extern void generic_mourn_inferior (void);
 128
 129 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 130                                               struct type *type,
 131                                               const gdb_byte *buf);
 132 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 133                                          struct type *type, gdb_byte *buf,
 134                                          CORE_ADDR addr);
 135 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 136                                             struct type *type,
 137                                             const gdb_byte *buf);
 138 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 139                                        struct type *type, gdb_byte *buf,
 140                                        CORE_ADDR addr);
 141
 142 extern void reopen_exec_file (void);
 143
 144 /* From misc files */
 145
 146 extern void default_print_registers_info (struct gdbarch *gdbarch,
 147                                           struct ui_file *file,
 148                                           struct frame_info *frame,
 149                                           int regnum, int all);
 150
 151 /* Default implementation of gdbarch_print_float_info.  Print
 152    the values of all floating point registers.  */
 153
 154 extern void default_print_float_info (struct gdbarch *gdbarch,
 155                                       struct ui_file *file,
 156                                       struct frame_info *frame,
 157                                       const char *args);
 158
 159 extern void child_terminal_info (struct target_ops *self, const char *, int);
 160
 161 extern void child_terminal_ours (struct target_ops *self);
 162
 163 extern void child_terminal_ours_for_output (struct target_ops *self);
 164
 165 extern void child_terminal_inferior (struct target_ops *self);
 166
 167 extern void child_terminal_save_inferior (struct target_ops *self);
 168
 169 extern void child_terminal_init (struct target_ops *self);
 170
 171 extern void child_terminal_init_with_pgrp (int pgrp);
 172
 173 extern void child_pass_ctrlc (struct target_ops *self);
 174
 175 extern void child_interrupt (struct target_ops *self);
 176
 177 /* From fork-child.c */
 178
 179 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
 180    This function already calls set_executing.  Return the ptid_t from
 181    STARTUP_INFERIOR.  */
 182 extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
 183
 184 /* From infcmd.c */
 185
 186 /* Initial inferior setup.  Determines the exec file is not yet known,
 187    takes any necessary post-attaching actions, fetches the target
 188    description and syncs the shared library list.  */
 189
 190 extern void setup_inferior (int from_tty);
 191
 192 extern void post_create_inferior (struct target_ops *, int);
 193
 194 extern void attach_command (const char *, int);
 195
 196 extern const char *get_inferior_args (void);
 197
 198 extern void set_inferior_args (const char *);
 199
 200 extern void set_inferior_args_vector (int, char **);
 201
 202 extern void registers_info (const char *, int);
 203
 204 extern void continue_1 (int all_threads);
 205
 206 extern void interrupt_target_1 (bool all_threads);
 207
 208 using delete_longjmp_breakpoint_cleanup
 209   = FORWARD_SCOPE_EXIT (delete_longjmp_breakpoint);
 210
 211 extern void detach_command (const char *, int);
 212
 213 extern void notice_new_inferior (struct thread_info *, int, int);
 214
 215 extern struct value *get_return_value (struct value *function,
 216                                        struct type *value_type);
 217
 218 /* Prepare for execution command.  TARGET is the target that will run
 219    the command.  BACKGROUND determines whether this is a foreground
 220    (synchronous) or background (asynchronous) command.  */
 221
 222 extern void prepare_execution_command (struct target_ops *target,
 223                                        int background);
 224
 225 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 226
 227 extern enum stop_stack_kind stop_stack_dummy;
 228
 229 /* Nonzero if program stopped due to a random (unexpected) signal in
 230    inferior process.  */
 231
 232 extern int stopped_by_random_signal;
 233
 234 /* Print notices on inferior events (attach, detach, etc.), set with
 235    `set print inferior-events'.  */
 236 extern bool print_inferior_events;
 237
 238 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 239    will handle it themselves.  STOP_QUIETLY is used when running in
 240    the shell before the child program has been exec'd and when running
 241    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 242    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 243    except that there is no need to hide a signal.  */
 244
 245 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 246    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 247    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 248    a ptraced process has changed.  Earlier versions of the kernel
 249    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 250    other signal, i.e. it is not muffled.
 251
 252    If the gdb user does a 'continue' after the 'attach', gdb passes
 253    the global variable stop_signal (which stores the signal from the
 254    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 255    problematic, because the kernel doesn't ignore such SIGSTOP
 256    now.  I.e. it is reported back to gdb, which in turn presents it
 257    back to the user.
 258
 259    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 260    gdb to clear the value of stop_signal after the attach, so that it
 261    is not passed back down to the kernel.  */
 262
 263 enum stop_kind
 264   {
 265     NO_STOP_QUIETLY = 0,
 266     STOP_QUIETLY,
 267     STOP_QUIETLY_REMOTE,
 268     STOP_QUIETLY_NO_SIGSTOP
 269   };
 270
 271 \f
 272 /* Possible values for gdbarch_call_dummy_location.  */
 273 #define ON_STACK 1
 274 #define AT_ENTRY_POINT 4
 275
 276 /* Base class for target-specific inferior data.  */
 277
 278 struct private_inferior
 279 {
 280   virtual ~private_inferior () = 0;
 281 };
 282
 283 /* Inferior process specific part of `struct infcall_control_state'.
 284
 285    Inferior thread counterpart is `struct thread_control_state'.  */
 286
 287 struct inferior_control_state
 288 {
 289   inferior_control_state ()
 290     : stop_soon (NO_STOP_QUIETLY)
 291   {
 292   }
 293
 294   explicit inferior_control_state (enum stop_kind when)
 295     : stop_soon (when)
 296   {
 297   }
 298
 299   /* See the definition of stop_kind above.  */
 300   enum stop_kind stop_soon;
 301 };
 302
 303 /* Return a pointer to the current inferior.  */
 304 extern inferior *current_inferior ();
 305
 306 extern void set_current_inferior (inferior *);
 307
 308 /* Switch inferior (and program space) to INF, and switch to no thread
 309    selected.  */
 310 extern void switch_to_inferior_no_thread (inferior *inf);
 311
 312 /* GDB represents the state of each program execution with an object
 313    called an inferior.  An inferior typically corresponds to a process
 314    but is more general and applies also to targets that do not have a
 315    notion of processes.  Each run of an executable creates a new
 316    inferior, as does each attachment to an existing process.
 317    Inferiors have unique internal identifiers that are different from
 318    target process ids.  Each inferior may in turn have multiple
 319    threads running in it.
 320
 321    Inferiors are intrusively refcounted objects.  Unlike thread
 322    objects, being the user-selected inferior is considered a strong
 323    reference and is thus accounted for in the inferior object's
 324    refcount (see set_current_inferior).  When GDB needs to remember
 325    the selected inferior to later restore it, GDB temporarily bumps
 326    the inferior object's refcount, to prevent something deleting the
 327    inferior object before reverting back (e.g., due to a
 328    "remove-inferiors" command (see
 329    scoped_restore_current_inferior).  All other inferior
 330    references are considered weak references.  Inferiors are always
 331    listed exactly once in the inferior list, so placing an inferior in
 332    the inferior list is an implicit, not counted strong reference.  */
 333
 334 class inferior : public refcounted_object
 335 {
 336 public:
 337   explicit inferior (int pid);
 338   ~inferior ();
 339
 340   /* Returns true if we can delete this inferior.  */
 341   bool deletable () const { return refcount () == 0; }
 342
 343   /* Push T in this inferior's target stack.  */
 344   void push_target (struct target_ops *t)
 345   { m_target_stack.push (t); }
 346
 347   /* Unpush T from this inferior's target stack.  */
 348   int unpush_target (struct target_ops *t)
 349   { return m_target_stack.unpush (t); }
 350
 351   /* Returns true if T is pushed in this inferior's target stack.  */
 352   bool target_is_pushed (target_ops *t)
 353   { return m_target_stack.is_pushed (t); }
 354
 355   /* Find the target beneath T in this inferior's target stack.  */
 356   target_ops *find_target_beneath (const target_ops *t)
 357   { return m_target_stack.find_beneath (t); }
 358
 359   /* Return the target at the top of this inferior's target stack.  */
 360   target_ops *top_target ()
 361   { return m_target_stack.top (); }
 362
 363   /* Return the target at process_stratum level in this inferior's
 364      target stack.  */
 365   struct process_stratum_target *process_target ()
 366   { return (process_stratum_target *) m_target_stack.at (process_stratum); }
 367
 368   /* Return the target at STRATUM in this inferior's target stack.  */
 369   target_ops *target_at (enum strata stratum)
 370   { return m_target_stack.at (stratum); }
 371
 372   bool has_execution ()
 373   { return target_has_execution_1 (this); }
 374
 375   /* Pointer to next inferior in singly-linked list of inferiors.  */
 376   struct inferior *next = NULL;
 377
 378   /* This inferior's thread list.  */
 379   thread_info *thread_list = nullptr;
 380
 381   /* This inferior's ptid to thread map, only contains non exited threads.  */
 382   ptid_thread_map thread_map;
 383
 384   /* Returns a range adapter covering the inferior's threads,
 385      including exited threads.  Used like this:
 386
 387        for (thread_info *thr : inf->threads ())
 388          { .... }
 389   */
 390   inf_threads_range threads ()
 391   { return inf_threads_range (this->thread_list); }
 392
 393   /* Returns a range adapter covering the inferior's non-exited
 394      threads.  Used like this:
 395
 396        for (thread_info *thr : inf->non_exited_threads ())
 397          { .... }
 398   */
 399   inf_non_exited_threads_range non_exited_threads ()
 400   { return inf_non_exited_threads_range (this->thread_list); }
 401
 402   /* Like inferior::threads(), but returns a range adapter that can be
 403      used with range-for, safely.  I.e., it is safe to delete the
 404      currently-iterated thread, like this:
 405
 406      for (thread_info *t : inf->threads_safe ())
 407        if (some_condition ())
 408          delete f;
 409   */
 410   inline safe_inf_threads_range threads_safe ()
 411   { return safe_inf_threads_range (this->thread_list); }
 412
 413   /* Set/get file name for default use for standard in/out in the
 414      inferior.  On Unix systems, we try to make TERMINAL_NAME the
 415      inferior's controlling terminal.  If TERMINAL_NAME is nullptr or
 416      the empty string, then the inferior inherits GDB's terminal (or
 417      GDBserver's if spawning a remote process).  */
 418   void set_tty (const char *terminal_name);
 419   const char *tty ();
 420
 421   /* Convenient handle (GDB inferior id).  Unique across all
 422      inferiors.  */
 423   int num = 0;
 424
 425   /* Actual target inferior id, usually, a process id.  This matches
 426      the ptid_t.pid member of threads of this inferior.  */
 427   int pid = 0;
 428   /* True if the PID was actually faked by GDB.  */
 429   bool fake_pid_p = false;
 430
 431   /* The highest thread number this inferior ever had.  */
 432   int highest_thread_num = 0;
 433
 434   /* State of GDB control of inferior process execution.
 435      See `struct inferior_control_state'.  */
 436   inferior_control_state control;
 437
 438   /* True if this was an auto-created inferior, e.g. created from
 439      following a fork; false, if this inferior was manually added by
 440      the user, and we should not attempt to prune it
 441      automatically.  */
 442   bool removable = false;
 443
 444   /* The address space bound to this inferior.  */
 445   struct address_space *aspace = NULL;
 446
 447   /* The program space bound to this inferior.  */
 448   struct program_space *pspace = NULL;
 449
 450   /* The arguments string to use when running.  */
 451   char *args = NULL;
 452
 453   /* The size of elements in argv.  */
 454   int argc = 0;
 455
 456   /* The vector version of arguments.  If ARGC is nonzero,
 457      then we must compute ARGS from this (via the target).
 458      This is always coming from main's argv and therefore
 459      should never be freed.  */
 460   char **argv = NULL;
 461
 462   /* The current working directory that will be used when starting
 463      this inferior.  */
 464   gdb::unique_xmalloc_ptr<char> cwd;
 465
 466   /* The terminal state as set by the last target_terminal::terminal_*
 467      call.  */
 468   target_terminal_state terminal_state = target_terminal_state::is_ours;
 469
 470   /* Environment to use for running inferior,
 471      in format described in environ.h.  */
 472   gdb_environ environment;
 473
 474   /* True if this child process was attached rather than forked.  */
 475   bool attach_flag = false;
 476
 477   /* If this inferior is a vfork child, then this is the pointer to
 478      its vfork parent, if GDB is still attached to it.  */
 479   inferior *vfork_parent = NULL;
 480
 481   /* If this process is a vfork parent, this is the pointer to the
 482      child.  Since a vfork parent is left frozen by the kernel until
 483      the child execs or exits, a process can only have one vfork child
 484      at a given time.  */
 485   inferior *vfork_child = NULL;
 486
 487   /* True if this inferior should be detached when it's vfork sibling
 488      exits or execs.  */
 489   bool pending_detach = false;
 490
 491   /* True if this inferior is a vfork parent waiting for a vfork child
 492      not under our control to be done with the shared memory region,
 493      either by exiting or execing.  */
 494   bool waiting_for_vfork_done = false;
 495
 496   /* True if we're in the process of detaching from this inferior.  */
 497   bool detaching = false;
 498
 499   /* What is left to do for an execution command after any thread of
 500      this inferior stops.  For continuations associated with a
 501      specific thread, see `struct thread_info'.  */
 502   continuation *continuations = NULL;
 503
 504   /* True if setup_inferior wasn't called for this inferior yet.
 505      Until that is done, we must not access inferior memory or
 506      registers, as we haven't determined the target
 507      architecture/description.  */
 508   bool needs_setup = false;
 509
 510   /* Private data used by the target vector implementation.  */
 511   std::unique_ptr<private_inferior> priv;
 512
 513   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 514      In this case, the EXIT_CODE field is also valid.  */
 515   bool has_exit_code = false;
 516   LONGEST exit_code = 0;
 517
 518   /* Default flags to pass to the symbol reading functions.  These are
 519      used whenever a new objfile is created.  */
 520   symfile_add_flags symfile_flags = 0;
 521
 522   /* Info about an inferior's target description (if it's fetched; the
 523      user supplied description's filename, if any; etc.).  */
 524   target_desc_info *tdesc_info = NULL;
 525
 526   /* The architecture associated with the inferior through the
 527      connection to the target.
 528
 529      The architecture vector provides some information that is really
 530      a property of the inferior, accessed through a particular target:
 531      ptrace operations; the layout of certain RSP packets; the
 532      solib_ops vector; etc.  To differentiate architecture accesses to
 533      per-inferior/target properties from
 534      per-thread/per-frame/per-objfile properties, accesses to
 535      per-inferior/target properties should be made through
 536      this gdbarch.  */
 537   struct gdbarch *gdbarch = NULL;
 538
 539   /* Data related to displaced stepping.  */
 540   displaced_step_inferior_state displaced_step_state;
 541
 542   /* Per inferior data-pointers required by other GDB modules.  */
 543   REGISTRY_FIELDS;
 544
 545 private:
 546   /* The inferior's target stack.  */
 547   target_stack m_target_stack;
 548
 549   /* The name of terminal device to use for I/O.  */
 550   gdb::unique_xmalloc_ptr<char> m_terminal;
 551 };
 552
 553 /* Keep a registry of per-inferior data-pointers required by other GDB
 554    modules.  */
 555
 556 DECLARE_REGISTRY (inferior);
 557
 558 /* Add an inferior to the inferior list, print a message that a new
 559    inferior is found, and return the pointer to the new inferior.
 560    Caller may use this pointer to initialize the private inferior
 561    data.  */
 562 extern struct inferior *add_inferior (int pid);
 563
 564 /* Same as add_inferior, but don't print new inferior notifications to
 565    the CLI.  */
 566 extern struct inferior *add_inferior_silent (int pid);
 567
 568 extern void delete_inferior (struct inferior *todel);
 569
 570 /* Delete an existing inferior list entry, due to inferior detaching.  */
 571 extern void detach_inferior (inferior *inf);
 572
 573 extern void exit_inferior (inferior *inf);
 574
 575 extern void exit_inferior_silent (inferior *inf);
 576
 577 extern void exit_inferior_num_silent (int num);
 578
 579 extern void inferior_appeared (struct inferior *inf, int pid);
 580
 581 /* Search function to lookup an inferior of TARG by target 'pid'.  */
 582 extern struct inferior *find_inferior_pid (process_stratum_target *targ,
 583                                            int pid);
 584
 585 /* Search function to lookup an inferior of TARG whose pid is equal to
 586    'ptid.pid'. */
 587 extern struct inferior *find_inferior_ptid (process_stratum_target *targ,
 588                                             ptid_t ptid);
 589
 590 /* Search function to lookup an inferior by GDB 'num'.  */
 591 extern struct inferior *find_inferior_id (int num);
 592
 593 /* Find an inferior bound to PSPACE, giving preference to the current
 594    inferior.  */
 595 extern struct inferior *
 596   find_inferior_for_program_space (struct program_space *pspace);
 597
 598 /* Returns true if the inferior list is not empty.  */
 599 extern int have_inferiors (void);
 600
 601 /* Returns the number of live inferiors running on PROC_TARGET (real
 602    live processes with execution).  */
 603 extern int number_of_live_inferiors (process_stratum_target *proc_target);
 604
 605 /* Returns true if there are any live inferiors in the inferior list
 606    (not cores, not executables, real live processes).  */
 607 extern int have_live_inferiors (void);
 608
 609 /* Save/restore the current inferior.  */
 610
 611 class scoped_restore_current_inferior
 612 {
 613 public:
 614   scoped_restore_current_inferior ()
 615     : m_saved_inf (current_inferior ())
 616   {}
 617
 618   ~scoped_restore_current_inferior ()
 619   { set_current_inferior (m_saved_inf); }
 620
 621   DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior);
 622
 623 private:
 624   inferior *m_saved_inf;
 625 };
 626
 627
 628 /* Traverse all inferiors.  */
 629
 630 extern struct inferior *inferior_list;
 631
 632 /* Pull in the internals of the inferiors ranges and iterators.  Must
 633    be done after struct inferior is defined.  */
 634 #include "inferior-iter.h"
 635
 636 /* Return a range that can be used to walk over all inferiors
 637    inferiors, with range-for, safely.  I.e., it is safe to delete the
 638    currently-iterated inferior.  When combined with range-for, this
 639    allow convenient patterns like this:
 640
 641      for (inferior *inf : all_inferiors_safe ())
 642        if (some_condition ())
 643          delete inf;
 644 */
 645
 646 inline all_inferiors_safe_range
 647 all_inferiors_safe ()
 648 {
 649   return {};
 650 }
 651
 652 /* Returns a range representing all inferiors, suitable to use with
 653    range-for, like this:
 654
 655    for (inferior *inf : all_inferiors ())
 656      [...]
 657 */
 658
 659 inline all_inferiors_range
 660 all_inferiors (process_stratum_target *proc_target = nullptr)
 661 {
 662   return all_inferiors_range (proc_target);
 663 }
 664
 665 /* Return a range that can be used to walk over all inferiors with PID
 666    not zero, with range-for.  */
 667
 668 inline all_non_exited_inferiors_range
 669 all_non_exited_inferiors (process_stratum_target *proc_target = nullptr)
 670 {
 671   return all_non_exited_inferiors_range (proc_target);
 672 }
 673
 674 /* Prune away automatically added inferiors that aren't required
 675    anymore.  */
 676 extern void prune_inferiors (void);
 677
 678 extern int number_of_inferiors (void);
 679
 680 extern struct inferior *add_inferior_with_spaces (void);
 681
 682 /* Print the current selected inferior.  */
 683 extern void print_selected_inferior (struct ui_out *uiout);
 684
 685 #endif /* !defined (INFERIOR_H) */