1 /* Variables that describe the inferior process running under GDB:
2 Where it is, why it stopped, and how to step it.
4 Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
5 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
6 Free Software Foundation, Inc.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #if !defined (INFERIOR_H)
26 struct target_waitstatus;
36 #include "breakpoint.h"
38 /* For enum target_signal. */
41 /* For struct frame_id. */
44 #include "progspace.h"
46 /* Two structures are used to record inferior state.
48 inferior_thread_state contains state about the program itself like its
49 registers and any signal it received when it last stopped.
50 This state must be restored regardless of how the inferior function call
51 ends (either successfully, or after it hits a breakpoint or signal)
52 if the program is to properly continue where it left off.
54 inferior_status contains state regarding gdb's control of the inferior
55 itself like stepping control. It also contains session state like the
56 user's currently selected frame.
58 Call these routines around hand called functions, including function calls
59 in conditional breakpoints for example. */
61 struct inferior_thread_state;
62 struct inferior_status;
64 extern struct inferior_thread_state *save_inferior_thread_state (void);
65 extern struct inferior_status *save_inferior_status (void);
67 extern void restore_inferior_thread_state (struct inferior_thread_state *);
68 extern void restore_inferior_status (struct inferior_status *);
70 extern struct cleanup *make_cleanup_restore_inferior_thread_state (struct inferior_thread_state *);
71 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
73 extern void discard_inferior_thread_state (struct inferior_thread_state *);
74 extern void discard_inferior_status (struct inferior_status *);
76 extern struct regcache *get_inferior_thread_state_regcache (struct inferior_thread_state *);
78 /* The -1 ptid, often used to indicate either an error condition
79 or a "don't care" condition, i.e, "run all threads." */
80 extern ptid_t minus_one_ptid;
82 /* The null or zero ptid, often used to indicate no process. */
83 extern ptid_t null_ptid;
85 /* Attempt to find and return an existing ptid with the given PID, LWP,
86 and TID components. If none exists, create a new one and return
88 ptid_t ptid_build (int pid, long lwp, long tid);
90 /* Find/Create a ptid from just a pid. */
91 ptid_t pid_to_ptid (int pid);
93 /* Fetch the pid (process id) component from a ptid. */
94 int ptid_get_pid (ptid_t ptid);
96 /* Fetch the lwp (lightweight process) component from a ptid. */
97 long ptid_get_lwp (ptid_t ptid);
99 /* Fetch the tid (thread id) component from a ptid. */
100 long ptid_get_tid (ptid_t ptid);
102 /* Compare two ptids to see if they are equal */
103 extern int ptid_equal (ptid_t p1, ptid_t p2);
105 /* Return true if PTID represents a process id. */
106 extern int ptid_is_pid (ptid_t ptid);
108 /* Returns true if PTID matches filter FILTER. FILTER can be the wild
109 card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
110 a process (ptid_is_pid returns true), in which case, all lwps and
111 threads of that given process match, lwps and threads of other
112 processes do not; or, it can represent a specific thread, in which
113 case, only that thread will match true. PTID must represent a
114 specific LWP or THREAD, it can never be a wild card. */
116 extern int ptid_match (ptid_t ptid, ptid_t filter);
118 /* Save value of inferior_ptid so that it may be restored by
119 a later call to do_cleanups(). Returns the struct cleanup
120 pointer needed for later doing the cleanup. */
121 extern struct cleanup * save_inferior_ptid (void);
123 extern void set_sigint_trap (void);
125 extern void clear_sigint_trap (void);
127 /* Set/get file name for default use for standard in/out in the inferior. */
129 extern void set_inferior_io_terminal (const char *terminal_name);
130 extern const char *get_inferior_io_terminal (void);
132 /* Collected pid, tid, etc. of the debugged inferior. When there's
133 no inferior, PIDGET (inferior_ptid) will be 0. */
135 extern ptid_t inferior_ptid;
137 /* Are we simulating synchronous execution? This is used in async gdb
138 to implement the 'run', 'continue' etc commands, which will not
139 redisplay the prompt until the execution is actually over. */
140 extern int sync_execution;
142 /* Inferior environment. */
144 extern void clear_proceed_status (void);
146 extern void proceed (CORE_ADDR, enum target_signal, int);
148 extern int sched_multi;
150 /* When set, stop the 'step' command if we enter a function which has
151 no line number information. The normal behavior is that we step
152 over such function. */
153 extern int step_stop_if_no_debug;
155 /* If set, the inferior should be controlled in non-stop mode. In
156 this mode, each thread is controlled independently. Execution
157 commands apply only to the the selected thread by default, and stop
158 events stop only the thread that had the event -- the other threads
159 are kept running freely. */
162 /* If set (default), when following a fork, GDB will detach from one
163 the fork branches, child or parent. Exactly which branch is
164 detached depends on 'set follow-fork-mode' setting. */
165 extern int detach_fork;
167 extern void generic_mourn_inferior (void);
169 extern void terminal_save_ours (void);
171 extern void terminal_ours (void);
173 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
175 const gdb_byte *buf);
176 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
177 struct type *type, gdb_byte *buf,
179 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
181 const gdb_byte *buf);
182 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
183 struct type *type, gdb_byte *buf,
186 extern void wait_for_inferior (int treat_exec_as_sigtrap);
188 extern void prepare_for_detach (void);
190 extern void fetch_inferior_event (void *);
192 extern void init_wait_for_inferior (void);
194 extern void close_exec_file (void);
196 extern void reopen_exec_file (void);
198 /* The `resume' routine should only be called in special circumstances.
199 Normally, use `proceed', which handles a lot of bookkeeping. */
201 extern void resume (int, enum target_signal);
203 /* From misc files */
205 extern void default_print_registers_info (struct gdbarch *gdbarch,
206 struct ui_file *file,
207 struct frame_info *frame,
208 int regnum, int all);
210 extern void child_terminal_info (char *, int);
212 extern void term_info (char *, int);
214 extern void terminal_ours_for_output (void);
216 extern void terminal_inferior (void);
218 extern void terminal_init_inferior (void);
220 extern void terminal_init_inferior_with_pgrp (int pgrp);
222 /* From fork-child.c */
224 extern int fork_inferior (char *, char *, char **,
226 void (*)(int), void (*)(void), char *);
229 extern void startup_inferior (int);
231 extern char *construct_inferior_arguments (int, char **);
235 extern void start_remote (int from_tty);
237 extern void normal_stop (void);
239 extern int signal_stop_state (int);
241 extern int signal_print_state (int);
243 extern int signal_pass_state (int);
245 extern int signal_stop_update (int, int);
247 extern int signal_print_update (int, int);
249 extern int signal_pass_update (int, int);
251 extern void get_last_target_status(ptid_t *ptid,
252 struct target_waitstatus *status);
254 extern void follow_inferior_reset_breakpoints (void);
256 /* Throw an error indicating the current thread is running. */
257 extern void error_is_running (void);
259 /* Calls error_is_running if the current thread is running. */
260 extern void ensure_not_running (void);
262 void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
266 extern void post_create_inferior (struct target_ops *, int);
268 extern void attach_command (char *, int);
270 extern char *get_inferior_args (void);
272 extern void set_inferior_args (char *);
274 extern void set_inferior_args_vector (int, char **);
276 extern void registers_info (char *, int);
278 extern void nexti_command (char *, int);
280 extern void stepi_command (char *, int);
282 extern void continue_1 (int all_threads);
284 extern void continue_command (char *, int);
286 extern void interrupt_target_command (char *args, int from_tty);
288 extern void interrupt_target_1 (int all_threads);
290 extern void detach_command (char *, int);
292 extern void notice_new_inferior (ptid_t, int, int);
294 /* Address at which inferior stopped. */
296 extern CORE_ADDR stop_pc;
298 /* Nonzero if stopped due to completion of a stack dummy routine. */
300 extern enum stop_stack_kind stop_stack_dummy;
302 /* Nonzero if program stopped due to a random (unexpected) signal in
305 extern int stopped_by_random_signal;
307 /* STEP_OVER_ALL means step over all subroutine calls.
308 STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
309 STEP_OVER_NONE means don't step over any subroutine calls. */
311 enum step_over_calls_kind
315 STEP_OVER_UNDEBUGGABLE
318 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
319 will handle it themselves. STOP_QUIETLY is used when running in
320 the shell before the child program has been exec'd and when running
321 through shared library loading. STOP_QUIETLY_REMOTE is used when
322 setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
323 except that there is no need to hide a signal. */
325 /* It is also used after attach, due to attaching to a process. This
326 is a bit trickier. When doing an attach, the kernel stops the
327 debuggee with a SIGSTOP. On newer GNU/Linux kernels (>= 2.5.61)
328 the handling of SIGSTOP for a ptraced process has changed. Earlier
329 versions of the kernel would ignore these SIGSTOPs, while now
330 SIGSTOP is treated like any other signal, i.e. it is not muffled.
332 If the gdb user does a 'continue' after the 'attach', gdb passes
333 the global variable stop_signal (which stores the signal from the
334 attach, SIGSTOP) to the ptrace(PTRACE_CONT,...) call. This is
335 problematic, because the kernel doesn't ignore such SIGSTOP
336 now. I.e. it is reported back to gdb, which in turn presents it
339 To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
340 gdb to clear the value of stop_signal after the attach, so that it
341 is not passed back down to the kernel. */
348 STOP_QUIETLY_NO_SIGSTOP
351 /* Reverse execution. */
352 enum exec_direction_kind
359 extern enum exec_direction_kind execution_direction;
361 /* Save register contents here when executing a "finish" command or are
362 about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
363 Thus this contains the return value from the called function (assuming
364 values are returned in a register). */
366 extern struct regcache *stop_registers;
368 /* True if we are debugging displaced stepping. */
369 extern int debug_displaced;
371 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline. */
372 void displaced_step_dump_bytes (struct ui_file *file,
373 const gdb_byte *buf, size_t len);
376 /* Possible values for gdbarch_call_dummy_location. */
378 #define AT_ENTRY_POINT 4
381 /* If STARTUP_WITH_SHELL is set, GDB's "run"
382 will attempts to start up the debugee under a shell.
383 This is in order for argument-expansion to occur. E.g.,
385 The "*" gets expanded by the shell into a list of files.
386 While this is a nice feature, it turns out to interact badly
387 with some of the catch-fork/catch-exec features we have added.
388 In particular, if the shell does any fork/exec's before
389 the exec of the target program, that can confuse GDB.
390 To disable this feature, set STARTUP_WITH_SHELL to 0.
391 To enable this feature, set STARTUP_WITH_SHELL to 1.
392 The catch-exec traps expected during start-up will
393 be 1 if target is not started up with a shell, 2 if it is.
395 If you disable this, you need to decrement
396 START_INFERIOR_TRAPS_EXPECTED in tm.h. */
397 #define STARTUP_WITH_SHELL 1
398 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
399 #define START_INFERIOR_TRAPS_EXPECTED 2
402 struct private_inferior;
404 /* GDB represents the state of each program execution with an object
405 called an inferior. An inferior typically corresponds to a process
406 but is more general and applies also to targets that do not have a
407 notion of processes. Each run of an executable creates a new
408 inferior, as does each attachment to an existing process.
409 Inferiors have unique internal identifiers that are different from
410 target process ids. Each inferior may in turn have multiple
411 threads running in it. */
415 /* Pointer to next inferior in singly-linked list of inferiors. */
416 struct inferior *next;
418 /* Convenient handle (GDB inferior id). Unique across all
422 /* Actual target inferior id, usually, a process id. This matches
423 the ptid_t.pid member of threads of this inferior. */
426 /* True if this was an auto-created inferior, e.g. created from
427 following a fork; false, if this inferior was manually added by
428 the user, and we should not attempt to prune it
432 /* The address space bound to this inferior. */
433 struct address_space *aspace;
435 /* The program space bound to this inferior. */
436 struct program_space *pspace;
438 /* The arguments string to use when running. */
441 /* The size of elements in argv. */
444 /* The vector version of arguments. If ARGC is nonzero,
445 then we must compute ARGS from this (via the target).
446 This is always coming from main's argv and therefore
447 should never be freed. */
450 /* The name of terminal device to use for I/O. */
453 /* Environment to use for running inferior,
454 in format described in environ.h. */
455 struct gdb_environ *environment;
457 /* See the definition of stop_kind above. */
458 enum stop_kind stop_soon;
460 /* Nonzero if this child process was attached rather than
464 /* If this inferior is a vfork child, then this is the pointer to
465 its vfork parent, if GDB is still attached to it. */
466 struct inferior *vfork_parent;
468 /* If this process is a vfork parent, this is the pointer to the
469 child. Since a vfork parent is left frozen by the kernel until
470 the child execs or exits, a process can only have one vfork child
472 struct inferior *vfork_child;
474 /* True if this inferior should be detached when it's vfork sibling
478 /* True if this inferior is a vfork parent waiting for a vfork child
479 not under our control to be done with the shared memory region,
480 either by exiting or execing. */
481 int waiting_for_vfork_done;
483 /* True if we're in the process of detaching from this inferior. */
486 /* What is left to do for an execution command after any thread of
487 this inferior stops. For continuations associated with a
488 specific thread, see `struct thread_info'. */
489 struct continuation *continuations;
491 /* Private data used by the target vector implementation. */
492 struct private_inferior *private;
494 /* We keep a count of the number of times the user has requested a
495 particular syscall to be tracked, and pass this information to the
496 target. This lets capable targets implement filtering directly. */
498 /* Number of times that "any" syscall is requested. */
499 int any_syscall_count;
501 /* Count of each system call. */
502 VEC(int) *syscalls_counts;
504 /* This counts all syscall catch requests, so we can readily determine
505 if any catching is necessary. */
506 int total_syscalls_count;
508 /* Per inferior data-pointers required by other GDB modules. */
513 /* Keep a registry of per-inferior data-pointers required by other GDB
516 extern const struct inferior_data *register_inferior_data (void);
517 extern const struct inferior_data *register_inferior_data_with_cleanup
518 (void (*cleanup) (struct inferior *, void *));
519 extern void clear_inferior_data (struct inferior *inf);
520 extern void set_inferior_data (struct inferior *inf,
521 const struct inferior_data *data, void *value);
522 extern void *inferior_data (struct inferior *inf,
523 const struct inferior_data *data);
525 /* Create an empty inferior list, or empty the existing one. */
526 extern void init_inferior_list (void);
528 /* Add an inferior to the inferior list, print a message that a new
529 inferior is found, and return the pointer to the new inferior.
530 Caller may use this pointer to initialize the private inferior
532 extern struct inferior *add_inferior (int pid);
534 /* Same as add_inferior, but don't print new inferior notifications to
536 extern struct inferior *add_inferior_silent (int pid);
538 /* Delete an existing inferior list entry, due to inferior exit. */
539 extern void delete_inferior (int pid);
541 extern void delete_inferior_1 (struct inferior *todel, int silent);
543 /* Same as delete_inferior, but don't print new inferior notifications
545 extern void delete_inferior_silent (int pid);
547 /* Delete an existing inferior list entry, due to inferior detaching. */
548 extern void detach_inferior (int pid);
550 extern void exit_inferior (int pid);
552 extern void exit_inferior_silent (int pid);
554 extern void exit_inferior_num_silent (int num);
556 extern void inferior_appeared (struct inferior *inf, int pid);
558 /* Get rid of all inferiors. */
559 extern void discard_all_inferiors (void);
561 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
562 into a "pid" (which may be overloaded with extra inferior information). */
563 extern int gdb_inferior_id_to_pid (int);
565 /* Translate a target 'pid' into the integer inferior id (GDB's
566 homegrown id, not the system's). */
567 extern int pid_to_gdb_inferior_id (int pid);
569 /* Boolean test for an already-known pid. */
570 extern int in_inferior_list (int pid);
572 /* Boolean test for an already-known inferior id (GDB's homegrown id,
573 not the system's). */
574 extern int valid_gdb_inferior_id (int num);
576 /* Search function to lookup an inferior by target 'pid'. */
577 extern struct inferior *find_inferior_pid (int pid);
579 /* Search function to lookup an inferior by GDB 'num'. */
580 extern struct inferior *find_inferior_id (int num);
582 /* Find an inferior bound to PSPACE. */
583 extern struct inferior *
584 find_inferior_for_program_space (struct program_space *pspace);
586 /* Inferior iterator function.
588 Calls a callback function once for each inferior, so long as the
589 callback function returns false. If the callback function returns
590 true, the iteration will end and the current inferior will be
591 returned. This can be useful for implementing a search for a
592 inferior with arbitrary attributes, or for applying some operation
595 It is safe to delete the iterated inferior from the callback. */
596 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
600 /* Prints the list of inferiors and their details on UIOUT.
602 If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior
603 that should be printed. Otherwise, all inferiors are printed. */
604 extern void print_inferior (struct ui_out *uiout, int requested_inferior);
606 /* Returns true if the inferior list is not empty. */
607 extern int have_inferiors (void);
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);
613 /* Return a pointer to the current inferior. It is an error to call
614 this if there is no current inferior. */
615 extern struct inferior *current_inferior (void);
617 extern void set_current_inferior (struct inferior *);
619 extern struct cleanup *save_current_inferior (void);
621 extern struct inferior *inferior_list;
623 /* Prune away automatically added inferiors that aren't required
625 extern void prune_inferiors (void);
627 extern int number_of_inferiors (void);
629 extern struct inferior *add_inferior_with_spaces (void);
631 extern void update_observer_mode (void);
633 #endif /* !defined (INFERIOR_H) */