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 #include <exception>
  25
  26 struct target_waitstatus;
  27 struct frame_info;
  28 struct ui_file;
  29 struct type;
  30 struct gdbarch;
  31 struct regcache;
  32 struct ui_out;
  33 struct terminal_info;
  34 struct target_desc_info;
  35 struct continuation;
  36 struct inferior;
  37 struct thread_info;
  38
  39 /* For bpstat.  */
  40 #include "breakpoint.h"
  41
  42 /* For enum gdb_signal.  */
  43 #include "target.h"
  44
  45 /* For struct frame_id.  */
  46 #include "frame.h"
  47
  48 /* For gdb_environ.  */
  49 #include "gdbsupport/environ.h"
  50
  51 #include "progspace.h"
  52 #include "registry.h"
  53
  54 #include "symfile-add-flags.h"
  55 #include "gdbsupport/refcounted-object.h"
  56 #include "gdbsupport/forward-scope-exit.h"
  57 #include "gdbsupport/gdb_unique_ptr.h"
  58
  59 #include "gdbsupport/common-inferior.h"
  60 #include "gdbthread.h"
  61
  62 #include "process-stratum-target.h"
  63
  64 struct infcall_suspend_state;
  65 struct infcall_control_state;
  66
  67 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  68 extern void restore_infcall_control_state (struct infcall_control_state *);
  69
  70 /* A deleter for infcall_suspend_state that calls
  71    restore_infcall_suspend_state.  */
  72 struct infcall_suspend_state_deleter
  73 {
  74   void operator() (struct infcall_suspend_state *state) const
  75   {
  76     try
  77       {
  78         restore_infcall_suspend_state (state);
  79       }
  80     catch (const gdb_exception_error &e)
  81       {
  82         /* If we are restoring the inferior state due to an exception,
  83            some error message will be printed.  So, only warn the user
  84            when we cannot restore during normal execution.  */
  85         bool unwinding;
  86 #if __cpp_lib_uncaught_exceptions
  87         unwinding = std::uncaught_exceptions () > 0;
  88 #else
  89         unwinding = std::uncaught_exception ();
  90 #endif
  91         if (!unwinding)
  92           warning (_("Failed to restore inferior state: %s"), e.what ());
  93       }
  94   }
  95 };
  96
  97 /* A unique_ptr specialization for infcall_suspend_state.  */
  98 typedef std::unique_ptr<infcall_suspend_state, infcall_suspend_state_deleter>
  99     infcall_suspend_state_up;
 100
 101 extern infcall_suspend_state_up save_infcall_suspend_state ();
 102
 103 /* A deleter for infcall_control_state that calls
 104    restore_infcall_control_state.  */
 105 struct infcall_control_state_deleter
 106 {
 107   void operator() (struct infcall_control_state *state) const
 108   {
 109     restore_infcall_control_state (state);
 110   }
 111 };
 112
 113 /* A unique_ptr specialization for infcall_control_state.  */
 114 typedef std::unique_ptr<infcall_control_state, infcall_control_state_deleter>
 115     infcall_control_state_up;
 116
 117 extern infcall_control_state_up save_infcall_control_state ();
 118
 119 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
 120 extern void discard_infcall_control_state (struct infcall_control_state *);
 121
 122 extern readonly_detached_regcache *
 123   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
 124
 125 extern void set_sigint_trap (void);
 126
 127 extern void clear_sigint_trap (void);
 128
 129 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 130    no inferior, inferior_ptid.pid () will be 0.  */
 131
 132 extern ptid_t inferior_ptid;
 133
 134 extern void generic_mourn_inferior (void);
 135
 136 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 137                                               struct type *type,
 138                                               const gdb_byte *buf);
 139 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 140                                          struct type *type, gdb_byte *buf,
 141                                          CORE_ADDR addr);
 142 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 143                                             struct type *type,
 144                                             const gdb_byte *buf);
 145 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 146                                        struct type *type, gdb_byte *buf,
 147                                        CORE_ADDR addr);
 148
 149 extern void reopen_exec_file (void);
 150
 151 /* From misc files */
 152
 153 extern void default_print_registers_info (struct gdbarch *gdbarch,
 154                                           struct ui_file *file,
 155                                           struct frame_info *frame,
 156                                           int regnum, int all);
 157
 158 /* Default implementation of gdbarch_print_float_info.  Print
 159    the values of all floating point registers.  */
 160
 161 extern void default_print_float_info (struct gdbarch *gdbarch,
 162                                       struct ui_file *file,
 163                                       struct frame_info *frame,
 164                                       const char *args);
 165
 166 extern void child_terminal_info (struct target_ops *self, const char *, int);
 167
 168 extern void child_terminal_ours (struct target_ops *self);
 169
 170 extern void child_terminal_ours_for_output (struct target_ops *self);
 171
 172 extern void child_terminal_inferior (struct target_ops *self);
 173
 174 extern void child_terminal_save_inferior (struct target_ops *self);
 175
 176 extern void child_terminal_init (struct target_ops *self);
 177
 178 extern void child_terminal_init_with_pgrp (int pgrp);
 179
 180 extern void child_pass_ctrlc (struct target_ops *self);
 181
 182 extern void child_interrupt (struct target_ops *self);
 183
 184 /* From fork-child.c */
 185
 186 /* Helper function to call STARTUP_INFERIOR with PID and NUM_TRAPS.
 187    This function already calls set_executing.  Return the ptid_t from
 188    STARTUP_INFERIOR.  */
 189 extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
 190
 191 /* From infcmd.c */
 192
 193 /* Initial inferior setup.  Determines the exec file is not yet known,
 194    takes any necessary post-attaching actions, fetches the target
 195    description and syncs the shared library list.  */
 196
 197 extern void setup_inferior (int from_tty);
 198
 199 extern void post_create_inferior (int from_tty);
 200
 201 extern void attach_command (const char *, int);
 202
 203 extern const char *get_inferior_args (void);
 204
 205 extern void set_inferior_args (const char *);
 206
 207 extern void set_inferior_args_vector (int, char **);
 208
 209 extern void registers_info (const char *, int);
 210
 211 extern void continue_1 (int all_threads);
 212
 213 extern void interrupt_target_1 (bool all_threads);
 214
 215 using delete_longjmp_breakpoint_cleanup
 216   = FORWARD_SCOPE_EXIT (delete_longjmp_breakpoint);
 217
 218 extern void detach_command (const char *, int);
 219
 220 extern void notice_new_inferior (struct thread_info *, int, int);
 221
 222 extern struct value *get_return_value (struct value *function,
 223                                        struct type *value_type);
 224
 225 /* Prepare for execution command.  TARGET is the target that will run
 226    the command.  BACKGROUND determines whether this is a foreground
 227    (synchronous) or background (asynchronous) command.  */
 228
 229 extern void prepare_execution_command (struct target_ops *target,
 230                                        int background);
 231
 232 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 233
 234 extern enum stop_stack_kind stop_stack_dummy;
 235
 236 /* Nonzero if program stopped due to a random (unexpected) signal in
 237    inferior process.  */
 238
 239 extern int stopped_by_random_signal;
 240
 241 /* Print notices on inferior events (attach, detach, etc.), set with
 242    `set print inferior-events'.  */
 243 extern bool print_inferior_events;
 244
 245 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 246    will handle it themselves.  STOP_QUIETLY is used when running in
 247    the shell before the child program has been exec'd and when running
 248    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 249    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 250    except that there is no need to hide a signal.  */
 251
 252 /* STOP_QUIETLY_NO_SIGSTOP is used to handle a tricky situation with attach.
 253    When doing an attach, the kernel stops the debuggee with a SIGSTOP.
 254    On newer GNU/Linux kernels (>= 2.5.61) the handling of SIGSTOP for
 255    a ptraced process has changed.  Earlier versions of the kernel
 256    would ignore these SIGSTOPs, while now SIGSTOP is treated like any
 257    other signal, i.e. it is not muffled.
 258
 259    If the gdb user does a 'continue' after the 'attach', gdb passes
 260    the global variable stop_signal (which stores the signal from the
 261    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 262    problematic, because the kernel doesn't ignore such SIGSTOP
 263    now.  I.e. it is reported back to gdb, which in turn presents it
 264    back to the user.
 265
 266    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 267    gdb to clear the value of stop_signal after the attach, so that it
 268    is not passed back down to the kernel.  */
 269
 270 enum stop_kind
 271   {
 272     NO_STOP_QUIETLY = 0,
 273     STOP_QUIETLY,
 274     STOP_QUIETLY_REMOTE,
 275     STOP_QUIETLY_NO_SIGSTOP
 276   };
 277
 278 \f
 279 /* Possible values for gdbarch_call_dummy_location.  */
 280 #define ON_STACK 1
 281 #define AT_ENTRY_POINT 4
 282
 283 /* Base class for target-specific inferior data.  */
 284
 285 struct private_inferior
 286 {
 287   virtual ~private_inferior () = 0;
 288 };
 289
 290 /* Inferior process specific part of `struct infcall_control_state'.
 291
 292    Inferior thread counterpart is `struct thread_control_state'.  */
 293
 294 struct inferior_control_state
 295 {
 296   inferior_control_state ()
 297     : stop_soon (NO_STOP_QUIETLY)
 298   {
 299   }
 300
 301   explicit inferior_control_state (enum stop_kind when)
 302     : stop_soon (when)
 303   {
 304   }
 305
 306   /* See the definition of stop_kind above.  */
 307   enum stop_kind stop_soon;
 308 };
 309
 310 /* Return a pointer to the current inferior.  */
 311 extern inferior *current_inferior ();
 312
 313 extern void set_current_inferior (inferior *);
 314
 315 /* Switch inferior (and program space) to INF, and switch to no thread
 316    selected.  */
 317 extern void switch_to_inferior_no_thread (inferior *inf);
 318
 319 /* GDB represents the state of each program execution with an object
 320    called an inferior.  An inferior typically corresponds to a process
 321    but is more general and applies also to targets that do not have a
 322    notion of processes.  Each run of an executable creates a new
 323    inferior, as does each attachment to an existing process.
 324    Inferiors have unique internal identifiers that are different from
 325    target process ids.  Each inferior may in turn have multiple
 326    threads running in it.
 327
 328    Inferiors are intrusively refcounted objects.  Unlike thread
 329    objects, being the user-selected inferior is considered a strong
 330    reference and is thus accounted for in the inferior object's
 331    refcount (see set_current_inferior).  When GDB needs to remember
 332    the selected inferior to later restore it, GDB temporarily bumps
 333    the inferior object's refcount, to prevent something deleting the
 334    inferior object before reverting back (e.g., due to a
 335    "remove-inferiors" command (see
 336    scoped_restore_current_inferior).  All other inferior
 337    references are considered weak references.  Inferiors are always
 338    listed exactly once in the inferior list, so placing an inferior in
 339    the inferior list is an implicit, not counted strong reference.  */
 340
 341 class inferior : public refcounted_object
 342 {
 343 public:
 344   explicit inferior (int pid);
 345   ~inferior ();
 346
 347   /* Returns true if we can delete this inferior.  */
 348   bool deletable () const { return refcount () == 0; }
 349
 350   /* Push T in this inferior's target stack.  */
 351   void push_target (struct target_ops *t)
 352   { m_target_stack.push (t); }
 353
 354   /* Unpush T from this inferior's target stack.  */
 355   int unpush_target (struct target_ops *t)
 356   { return m_target_stack.unpush (t); }
 357
 358   /* Returns true if T is pushed in this inferior's target stack.  */
 359   bool target_is_pushed (target_ops *t)
 360   { return m_target_stack.is_pushed (t); }
 361
 362   /* Find the target beneath T in this inferior's target stack.  */
 363   target_ops *find_target_beneath (const target_ops *t)
 364   { return m_target_stack.find_beneath (t); }
 365
 366   /* Return the target at the top of this inferior's target stack.  */
 367   target_ops *top_target ()
 368   { return m_target_stack.top (); }
 369
 370   /* Return the target at process_stratum level in this inferior's
 371      target stack.  */
 372   struct process_stratum_target *process_target ()
 373   { return (process_stratum_target *) m_target_stack.at (process_stratum); }
 374
 375   /* Return the target at STRATUM in this inferior's target stack.  */
 376   target_ops *target_at (enum strata stratum)
 377   { return m_target_stack.at (stratum); }
 378
 379   bool has_execution ()
 380   { return target_has_execution (this); }
 381
 382   /* Pointer to next inferior in singly-linked list of inferiors.  */
 383   struct inferior *next = NULL;
 384
 385   /* This inferior's thread list.  */
 386   thread_info *thread_list = nullptr;
 387
 388   /* Returns a range adapter covering the inferior's threads,
 389      including exited threads.  Used like this:
 390
 391        for (thread_info *thr : inf->threads ())
 392          { .... }
 393   */
 394   inf_threads_range threads ()
 395   { return inf_threads_range (this->thread_list); }
 396
 397   /* Returns a range adapter covering the inferior's non-exited
 398      threads.  Used like this:
 399
 400        for (thread_info *thr : inf->non_exited_threads ())
 401          { .... }
 402   */
 403   inf_non_exited_threads_range non_exited_threads ()
 404   { return inf_non_exited_threads_range (this->thread_list); }
 405
 406   /* Like inferior::threads(), but returns a range adapter that can be
 407      used with range-for, safely.  I.e., it is safe to delete the
 408      currently-iterated thread, like this:
 409
 410      for (thread_info *t : inf->threads_safe ())
 411        if (some_condition ())
 412          delete f;
 413   */
 414   inline safe_inf_threads_range threads_safe ()
 415   { return safe_inf_threads_range (this->thread_list); }
 416
 417   /* Set/get file name for default use for standard in/out in the
 418      inferior.  On Unix systems, we try to make TERMINAL_NAME the
 419      inferior's controlling terminal.  If TERMINAL_NAME is nullptr or
 420      the empty string, then the inferior inherits GDB's terminal (or
 421      GDBserver's if spawning a remote process).  */
 422   void set_tty (const char *terminal_name);
 423   const char *tty ();
 424
 425   /* Convenient handle (GDB inferior id).  Unique across all
 426      inferiors.  */
 427   int num = 0;
 428
 429   /* Actual target inferior id, usually, a process id.  This matches
 430      the ptid_t.pid member of threads of this inferior.  */
 431   int pid = 0;
 432   /* True if the PID was actually faked by GDB.  */
 433   bool fake_pid_p = false;
 434
 435   /* The highest thread number this inferior ever had.  */
 436   int highest_thread_num = 0;
 437
 438   /* State of GDB control of inferior process execution.
 439      See `struct inferior_control_state'.  */
 440   inferior_control_state control;
 441
 442   /* True if this was an auto-created inferior, e.g. created from
 443      following a fork; false, if this inferior was manually added by
 444      the user, and we should not attempt to prune it
 445      automatically.  */
 446   bool removable = false;
 447
 448   /* The address space bound to this inferior.  */
 449   struct address_space *aspace = NULL;
 450
 451   /* The program space bound to this inferior.  */
 452   struct program_space *pspace = NULL;
 453
 454   /* The arguments string to use when running.  */
 455   char *args = NULL;
 456
 457   /* The size of elements in argv.  */
 458   int argc = 0;
 459
 460   /* The vector version of arguments.  If ARGC is nonzero,
 461      then we must compute ARGS from this (via the target).
 462      This is always coming from main's argv and therefore
 463      should never be freed.  */
 464   char **argv = NULL;
 465
 466   /* The current working directory that will be used when starting
 467      this inferior.  */
 468   gdb::unique_xmalloc_ptr<char> cwd;
 469
 470   /* The terminal state as set by the last target_terminal::terminal_*
 471      call.  */
 472   target_terminal_state terminal_state = target_terminal_state::is_ours;
 473
 474   /* Environment to use for running inferior,
 475      in format described in environ.h.  */
 476   gdb_environ environment;
 477
 478   /* True if this child process was attached rather than forked.  */
 479   bool attach_flag = false;
 480
 481   /* If this inferior is a vfork child, then this is the pointer to
 482      its vfork parent, if GDB is still attached to it.  */
 483   inferior *vfork_parent = NULL;
 484
 485   /* If this process is a vfork parent, this is the pointer to the
 486      child.  Since a vfork parent is left frozen by the kernel until
 487      the child execs or exits, a process can only have one vfork child
 488      at a given time.  */
 489   inferior *vfork_child = NULL;
 490
 491   /* True if this inferior should be detached when it's vfork sibling
 492      exits or execs.  */
 493   bool pending_detach = false;
 494
 495   /* True if this inferior is a vfork parent waiting for a vfork child
 496      not under our control to be done with the shared memory region,
 497      either by exiting or execing.  */
 498   bool waiting_for_vfork_done = false;
 499
 500   /* True if we're in the process of detaching from this inferior.  */
 501   bool detaching = false;
 502
 503   /* What is left to do for an execution command after any thread of
 504      this inferior stops.  For continuations associated with a
 505      specific thread, see `struct thread_info'.  */
 506   continuation *continuations = NULL;
 507
 508   /* True if setup_inferior wasn't called for this inferior yet.
 509      Until that is done, we must not access inferior memory or
 510      registers, as we haven't determined the target
 511      architecture/description.  */
 512   bool needs_setup = false;
 513
 514   /* Private data used by the target vector implementation.  */
 515   std::unique_ptr<private_inferior> priv;
 516
 517   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 518      In this case, the EXIT_CODE field is also valid.  */
 519   bool has_exit_code = false;
 520   LONGEST exit_code = 0;
 521
 522   /* Default flags to pass to the symbol reading functions.  These are
 523      used whenever a new objfile is created.  */
 524   symfile_add_flags symfile_flags = 0;
 525
 526   /* Info about an inferior's target description (if it's fetched; the
 527      user supplied description's filename, if any; etc.).  */
 528   target_desc_info *tdesc_info = NULL;
 529
 530   /* The architecture associated with the inferior through the
 531      connection to the target.
 532
 533      The architecture vector provides some information that is really
 534      a property of the inferior, accessed through a particular target:
 535      ptrace operations; the layout of certain RSP packets; the
 536      solib_ops vector; etc.  To differentiate architecture accesses to
 537      per-inferior/target properties from
 538      per-thread/per-frame/per-objfile properties, accesses to
 539      per-inferior/target properties should be made through
 540      this gdbarch.  */
 541   struct gdbarch *gdbarch = NULL;
 542
 543   /* Data related to displaced stepping.  */
 544   displaced_step_inferior_state displaced_step_state;
 545
 546   /* Per inferior data-pointers required by other GDB modules.  */
 547   REGISTRY_FIELDS;
 548
 549 private:
 550   /* The inferior's target stack.  */
 551   target_stack m_target_stack;
 552
 553   /* The name of terminal device to use for I/O.  */
 554   gdb::unique_xmalloc_ptr<char> m_terminal;
 555 };
 556
 557 /* Keep a registry of per-inferior data-pointers required by other GDB
 558    modules.  */
 559
 560 DECLARE_REGISTRY (inferior);
 561
 562 /* Add an inferior to the inferior list, print a message that a new
 563    inferior is found, and return the pointer to the new inferior.
 564    Caller may use this pointer to initialize the private inferior
 565    data.  */
 566 extern struct inferior *add_inferior (int pid);
 567
 568 /* Same as add_inferior, but don't print new inferior notifications to
 569    the CLI.  */
 570 extern struct inferior *add_inferior_silent (int pid);
 571
 572 extern void delete_inferior (struct inferior *todel);
 573
 574 /* Delete an existing inferior list entry, due to inferior detaching.  */
 575 extern void detach_inferior (inferior *inf);
 576
 577 extern void exit_inferior (inferior *inf);
 578
 579 extern void exit_inferior_silent (inferior *inf);
 580
 581 extern void exit_inferior_num_silent (int num);
 582
 583 extern void inferior_appeared (struct inferior *inf, int pid);
 584
 585 /* Search function to lookup an inferior of TARG by target 'pid'.  */
 586 extern struct inferior *find_inferior_pid (process_stratum_target *targ,
 587                                            int pid);
 588
 589 /* Search function to lookup an inferior of TARG whose pid is equal to
 590    'ptid.pid'. */
 591 extern struct inferior *find_inferior_ptid (process_stratum_target *targ,
 592                                             ptid_t ptid);
 593
 594 /* Search function to lookup an inferior by GDB 'num'.  */
 595 extern struct inferior *find_inferior_id (int num);
 596
 597 /* Find an inferior bound to PSPACE, giving preference to the current
 598    inferior.  */
 599 extern struct inferior *
 600   find_inferior_for_program_space (struct program_space *pspace);
 601
 602 /* Returns true if the inferior list is not empty.  */
 603 extern int have_inferiors (void);
 604
 605 /* Returns the number of live inferiors running on PROC_TARGET (real
 606    live processes with execution).  */
 607 extern int number_of_live_inferiors (process_stratum_target *proc_target);
 608
 609 /* Returns true if there are any live inferiors in the inferior list
 610    (not cores, not executables, real live processes).  */
 611 extern int have_live_inferiors (void);
 612
 613 /* Save/restore the current inferior.  */
 614
 615 class scoped_restore_current_inferior
 616 {
 617 public:
 618   scoped_restore_current_inferior ()
 619     : m_saved_inf (current_inferior ())
 620   {}
 621
 622   ~scoped_restore_current_inferior ()
 623   { set_current_inferior (m_saved_inf); }
 624
 625   DISABLE_COPY_AND_ASSIGN (scoped_restore_current_inferior);
 626
 627 private:
 628   inferior *m_saved_inf;
 629 };
 630
 631
 632 /* Traverse all inferiors.  */
 633
 634 extern struct inferior *inferior_list;
 635
 636 /* Pull in the internals of the inferiors ranges and iterators.  Must
 637    be done after struct inferior is defined.  */
 638 #include "inferior-iter.h"
 639
 640 /* Return a range that can be used to walk over all inferiors
 641    inferiors, with range-for, safely.  I.e., it is safe to delete the
 642    currently-iterated inferior.  When combined with range-for, this
 643    allow convenient patterns like this:
 644
 645      for (inferior *inf : all_inferiors_safe ())
 646        if (some_condition ())
 647          delete inf;
 648 */
 649
 650 inline all_inferiors_safe_range
 651 all_inferiors_safe ()
 652 {
 653   return {};
 654 }
 655
 656 /* Returns a range representing all inferiors, suitable to use with
 657    range-for, like this:
 658
 659    for (inferior *inf : all_inferiors ())
 660      [...]
 661 */
 662
 663 inline all_inferiors_range
 664 all_inferiors (process_stratum_target *proc_target = nullptr)
 665 {
 666   return all_inferiors_range (proc_target);
 667 }
 668
 669 /* Return a range that can be used to walk over all inferiors with PID
 670    not zero, with range-for.  */
 671
 672 inline all_non_exited_inferiors_range
 673 all_non_exited_inferiors (process_stratum_target *proc_target = nullptr)
 674 {
 675   return all_non_exited_inferiors_range (proc_target);
 676 }
 677
 678 /* Prune away automatically added inferiors that aren't required
 679    anymore.  */
 680 extern void prune_inferiors (void);
 681
 682 extern int number_of_inferiors (void);
 683
 684 extern struct inferior *add_inferior_with_spaces (void);
 685
 686 /* Print the current selected inferior.  */
 687 extern void print_selected_inferior (struct ui_out *uiout);
 688
 689 #endif /* !defined (INFERIOR_H) */