src/keyboard.h

   1 /* Declarations useful when processing input.
   2    Copyright (C) 1985-1987, 1993, 2001-2013 Free Software Foundation,
   3    Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs 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 GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "systime.h"            /* for EMACS_TIME, Time */
  21 #include "coding.h"             /* for ENCODE_UTF_8 and ENCODE_SYSTEM */
  22
  23 INLINE_HEADER_BEGIN
  24 #ifndef KEYBOARD_INLINE
  25 # define KEYBOARD_INLINE INLINE
  26 #endif
  27
  28 /* Most code should use this macro to access Lisp fields in struct kboard.  */
  29
  30 #define KVAR(kboard, field) ((kboard)->INTERNAL_FIELD (field))
  31
  32 /* Each KBOARD represents one logical input stream from which Emacs
  33    gets input.  If we are using ordinary terminals, it has one KBOARD
  34    object for each terminal device.
  35    Usually each X display screen has its own KBOARD,
  36    but when two of them are on the same X server,
  37    we assume they share a keyboard and give them one KBOARD in common.
  38
  39    Some Lisp variables are per-kboard; they are stored in the KBOARD structure
  40    and accessed indirectly via a Lisp_Misc_Kboard_Objfwd object.
  41
  42    So that definition of keyboard macros, and reading of prefix arguments,
  43    can happen in parallel on various KBOARDs at once,
  44    the state information for those activities is stored in the KBOARD.
  45
  46    Emacs has two states for reading input:
  47
  48    ** Any kboard.  Emacs can accept input from any KBOARD,
  49    and as soon as any of them provides a complete command, Emacs can run it.
  50
  51    ** Single kboard.  Then Emacs is running a command for one KBOARD
  52    and can only read input from that KBOARD.
  53
  54    All input, from all KBOARDs, goes together in a single event queue
  55    at interrupt level.  read_char sees the events sequentially,
  56    but deals with them in accord with the current input state.
  57
  58    In the any-kboard state, read_key_sequence processes input from any KBOARD
  59    immediately.  When a new event comes in from a particular KBOARD,
  60    read_key_sequence switches to that KBOARD.  As a result,
  61    as soon as a complete key arrives from some KBOARD or other,
  62    Emacs starts executing that key's binding.  It switches to the
  63    single-kboard state for the execution of that command,
  64    so that that command can get input only from its own KBOARD.
  65
  66    While in the single-kboard state, read_char can consider input only
  67    from the current KBOARD.  If events come from other KBOARDs, they
  68    are put aside for later in the KBOARDs' kbd_queue lists.
  69    The flag kbd_queue_has_data in a KBOARD is 1 if this has happened.
  70    When Emacs goes back to the any-kboard state, it looks at all the KBOARDs
  71    to find those; and it tries processing their input right away.  */
  72
  73 typedef struct kboard KBOARD;
  74 struct kboard
  75   {
  76     KBOARD *next_kboard;
  77
  78     /* If non-nil, a keymap that overrides all others but applies only to
  79        this KBOARD.  Lisp code that uses this instead of calling read-char
  80        can effectively wait for input in the any-kboard state, and hence
  81        avoid blocking out the other KBOARDs.  See universal-argument in
  82        lisp/simple.el for an example.  */
  83     Lisp_Object INTERNAL_FIELD (Voverriding_terminal_local_map);
  84
  85     /* Last command executed by the editor command loop, not counting
  86        commands that set the prefix argument.  */
  87     Lisp_Object INTERNAL_FIELD (Vlast_command);
  88
  89     /* Normally same as last-command, but never modified by other commands.  */
  90     Lisp_Object INTERNAL_FIELD (Vreal_last_command);
  91
  92     /* User-supplied table to translate input characters through.  */
  93     Lisp_Object INTERNAL_FIELD (Vkeyboard_translate_table);
  94
  95     /* Last command that may be repeated by `repeat'.  */
  96     Lisp_Object INTERNAL_FIELD (Vlast_repeatable_command);
  97
  98     /* The prefix argument for the next command, in raw form.  */
  99     Lisp_Object INTERNAL_FIELD (Vprefix_arg);
 100
 101     /* Saved prefix argument for the last command, in raw form.  */
 102     Lisp_Object INTERNAL_FIELD (Vlast_prefix_arg);
 103
 104     /* Unread events specific to this kboard.  */
 105     Lisp_Object INTERNAL_FIELD (kbd_queue);
 106
 107     /* Non-nil while a kbd macro is being defined.  */
 108     Lisp_Object INTERNAL_FIELD (defining_kbd_macro);
 109
 110     /* The start of storage for the current keyboard macro.  */
 111     Lisp_Object *kbd_macro_buffer;
 112
 113     /* Where to store the next keystroke of the macro.  */
 114     Lisp_Object *kbd_macro_ptr;
 115
 116     /* The finalized section of the macro starts at kbd_macro_buffer and
 117        ends before this.  This is not the same as kbd_macro_ptr, because
 118        we advance this to kbd_macro_ptr when a key's command is complete.
 119        This way, the keystrokes for "end-kbd-macro" are not included in the
 120        macro.  This also allows us to throw away the events added to the
 121        macro by the last command: all the events between kbd_macro_end and
 122        kbd_macro_ptr belong to the last command; see
 123        cancel-kbd-macro-events.  */
 124     Lisp_Object *kbd_macro_end;
 125
 126     /* Allocated size of kbd_macro_buffer.  */
 127     ptrdiff_t kbd_macro_bufsize;
 128
 129     /* Last anonymous kbd macro defined.  */
 130     Lisp_Object INTERNAL_FIELD (Vlast_kbd_macro);
 131
 132     /* Alist of system-specific X windows key symbols.  */
 133     Lisp_Object INTERNAL_FIELD (Vsystem_key_alist);
 134
 135     /* Cache for modify_event_symbol.  */
 136     Lisp_Object INTERNAL_FIELD (system_key_syms);
 137
 138     /* The kind of display: x, w32, ...  */
 139     Lisp_Object INTERNAL_FIELD (Vwindow_system);
 140
 141     /* Keymap mapping keys to alternative preferred forms.
 142        See the DEFVAR for more documentation.  */
 143     Lisp_Object INTERNAL_FIELD (Vlocal_function_key_map);
 144
 145     /* Keymap mapping ASCII function key sequences onto their preferred
 146        forms.  Initialized by the terminal-specific lisp files.  See the
 147        DEFVAR for more documentation.  */
 148     Lisp_Object INTERNAL_FIELD (Vinput_decode_map);
 149
 150     /* Minibufferless frames on this display use this frame's minibuffer.  */
 151     Lisp_Object INTERNAL_FIELD (Vdefault_minibuffer_frame);
 152
 153     /* Number of displays using this KBOARD.  Normally 1, but can be
 154        larger when you have multiple screens on a single X display.  */
 155     int reference_count;
 156
 157     /* The text we're echoing in the modeline - partial key sequences,
 158        usually.  This is nil when not echoing.  */
 159     Lisp_Object INTERNAL_FIELD (echo_string);
 160
 161     /* This flag indicates that events were put into kbd_queue
 162        while Emacs was running for some other KBOARD.
 163        The flag means that, when Emacs goes into the any-kboard state again,
 164        it should check this KBOARD to see if there is a complete command
 165        waiting.
 166
 167        Note that the kbd_queue field can be non-nil even when
 168        kbd_queue_has_data is 0.  When we push back an incomplete
 169        command, then this flag is 0, meaning we don't want to try
 170        reading from this KBOARD again until more input arrives.  */
 171     char kbd_queue_has_data;
 172
 173     /* True means echo each character as typed.  */
 174     unsigned immediate_echo : 1;
 175
 176     /* If we have echoed a prompt string specified by the user,
 177        this is its length in characters.  Otherwise this is -1.  */
 178     ptrdiff_t echo_after_prompt;
 179   };
 180
 181 KEYBOARD_INLINE void
 182 kset_default_minibuffer_frame (struct kboard *kb, Lisp_Object val)
 183 {
 184   kb->INTERNAL_FIELD (Vdefault_minibuffer_frame) = val;
 185 }
 186 KEYBOARD_INLINE void
 187 kset_defining_kbd_macro (struct kboard *kb, Lisp_Object val)
 188 {
 189   kb->INTERNAL_FIELD (defining_kbd_macro) = val;
 190 }
 191 KEYBOARD_INLINE void
 192 kset_input_decode_map (struct kboard *kb, Lisp_Object val)
 193 {
 194   kb->INTERNAL_FIELD (Vinput_decode_map) = val;
 195 }
 196 KEYBOARD_INLINE void
 197 kset_last_command (struct kboard *kb, Lisp_Object val)
 198 {
 199   kb->INTERNAL_FIELD (Vlast_command) = val;
 200 }
 201 KEYBOARD_INLINE void
 202 kset_last_kbd_macro (struct kboard *kb, Lisp_Object val)
 203 {
 204   kb->INTERNAL_FIELD (Vlast_kbd_macro) = val;
 205 }
 206 KEYBOARD_INLINE void
 207 kset_prefix_arg (struct kboard *kb, Lisp_Object val)
 208 {
 209   kb->INTERNAL_FIELD (Vprefix_arg) = val;
 210 }
 211 KEYBOARD_INLINE void
 212 kset_system_key_alist (struct kboard *kb, Lisp_Object val)
 213 {
 214   kb->INTERNAL_FIELD (Vsystem_key_alist) = val;
 215 }
 216 KEYBOARD_INLINE void
 217 kset_window_system (struct kboard *kb, Lisp_Object val)
 218 {
 219   kb->INTERNAL_FIELD (Vwindow_system) = val;
 220 }
 221
 222 /* Temporarily used before a frame has been opened. */
 223 extern KBOARD *initial_kboard;
 224
 225 /* In the single-kboard state, this is the kboard
 226    from which input is accepted.
 227
 228    In the any-kboard state, this is the kboard from which we are
 229    right now considering input.  We can consider input from another
 230    kboard, but doing so requires throwing to wrong_kboard_jmpbuf.  */
 231 extern KBOARD *current_kboard;
 232
 233 /* A list of all kboard objects, linked through next_kboard.  */
 234 extern KBOARD *all_kboards;
 235 \f
 236 /* Total number of times read_char has returned, modulo UINTMAX_MAX + 1.  */
 237 extern uintmax_t num_input_events;
 238
 239 /* Nonzero means polling for input is temporarily suppressed.  */
 240 extern int poll_suppress_count;
 241
 242 /* Vector holding the key sequence that invoked the current command.
 243    It is reused for each command, and it may be longer than the current
 244    sequence; this_command_key_count indicates how many elements
 245    actually mean something.  */
 246 extern Lisp_Object this_command_keys;
 247 extern ptrdiff_t this_command_key_count;
 248
 249 /* The frame in which the last input event occurred, or Qmacro if the
 250    last event came from a macro.  We use this to determine when to
 251    generate switch-frame events.  This may be cleared by functions
 252    like Fselect_frame, to make sure that a switch-frame event is
 253    generated by the next character.  */
 254 extern Lisp_Object internal_last_event_frame;
 255 \f
 256 extern Lisp_Object Qrecompute_lucid_menubar, Qactivate_menubar_hook;
 257
 258 /* This holds a Lisp vector that holds the properties of a single
 259    menu item while decoding it in parse_menu_item.
 260    Using a Lisp vector to hold this information while we decode it
 261    takes care of protecting all the data from GC.  */
 262 extern Lisp_Object item_properties;
 263
 264 /* This describes the elements of item_properties.
 265    The first element is not a property, it is a pointer to the item properties
 266    that is saved for GC protection. */
 267 #define ITEM_PROPERTY_ITEM 0
 268 /* The item string.  */
 269 #define ITEM_PROPERTY_NAME 1
 270 /* Start of initialize to nil */
 271 /* The binding: nil, a command or a keymap.  */
 272 #define ITEM_PROPERTY_DEF 2
 273 /* The keymap if the binding is a keymap, otherwise nil.  */
 274 #define ITEM_PROPERTY_MAP 3
 275 /* Nil, :radio or :toggle.  */
 276 #define ITEM_PROPERTY_TYPE 4
 277 /* Nil or a string describing an equivalent key binding.  */
 278 #define ITEM_PROPERTY_KEYEQ 5
 279 /* Not nil if a selected toggle box or radio button, otherwise nil.  */
 280 #define ITEM_PROPERTY_SELECTED 6
 281 /* Place for a help string. Not yet used.  */
 282 #define ITEM_PROPERTY_HELP 7
 283 /* Start of initialize to t */
 284 /* Last property. */
 285 /* Not nil if item is enabled.  */
 286 #define ITEM_PROPERTY_ENABLE 8
 287
 288 /* This holds a Lisp vector that holds the results of decoding
 289    the keymaps or alist-of-alists that specify a menu.
 290
 291    It describes the panes and items within the panes.
 292
 293    Each pane is described by 3 elements in the vector:
 294    t, the pane name, the pane's prefix key.
 295    Then follow the pane's items, with 5 elements per item:
 296    the item string, the enable flag, the item's value,
 297    the definition, and the equivalent keyboard key's description string.
 298
 299    In some cases, multiple levels of menus may be described.
 300    A single vector slot containing nil indicates the start of a submenu.
 301    A single vector slot containing lambda indicates the end of a submenu.
 302    The submenu follows a menu item which is the way to reach the submenu.
 303
 304    A single vector slot containing quote indicates that the
 305    following items should appear on the right of a dialog box.
 306
 307    Using a Lisp vector to hold this information while we decode it
 308    takes care of protecting all the data from GC.  */
 309 extern Lisp_Object menu_items;
 310
 311 /* If non-nil, means that the global vars defined here are already in use.
 312    Used to detect cases where we try to re-enter this non-reentrant code.  */
 313 #if defined USE_GTK || defined USE_MOTIF
 314 extern Lisp_Object menu_items_inuse;
 315 #endif
 316
 317 /* Number of slots currently allocated in menu_items.  */
 318 extern int menu_items_allocated;
 319
 320 /* This is the index in menu_items of the first empty slot.  */
 321 extern int menu_items_used;
 322
 323 /* The number of panes currently recorded in menu_items,
 324    excluding those within submenus.  */
 325 extern int menu_items_n_panes;
 326
 327 #define MENU_ITEMS_PANE_NAME 1
 328 #define MENU_ITEMS_PANE_PREFIX 2
 329 #define MENU_ITEMS_PANE_LENGTH 3
 330
 331 enum menu_item_idx
 332 {
 333   MENU_ITEMS_ITEM_NAME = 0,
 334   MENU_ITEMS_ITEM_ENABLE,
 335   MENU_ITEMS_ITEM_VALUE,
 336   MENU_ITEMS_ITEM_EQUIV_KEY,
 337   MENU_ITEMS_ITEM_DEFINITION,
 338   MENU_ITEMS_ITEM_TYPE,
 339   MENU_ITEMS_ITEM_SELECTED,
 340   MENU_ITEMS_ITEM_HELP,
 341   MENU_ITEMS_ITEM_LENGTH
 342 };
 343
 344 extern Lisp_Object unuse_menu_items (Lisp_Object dummy);
 345
 346 /* This is how to deal with multibyte text if HAVE_MULTILINGUAL_MENU
 347    isn't defined.  The use of HAVE_MULTILINGUAL_MENU could probably be
 348    confined to an extended version of this with sections of code below
 349    using it unconditionally.  */
 350 #ifndef HAVE_NTGUI
 351 #if defined (USE_GTK) || defined (HAVE_NS)
 352 # define ENCODE_MENU_STRING(str) ENCODE_UTF_8 (str)
 353 #elif defined HAVE_X_I18N
 354 #define ENCODE_MENU_STRING(str) ENCODE_SYSTEM (str)
 355 #else
 356 #define ENCODE_MENU_STRING(str) string_make_unibyte (str)
 357 #endif /* USE_GTK  */
 358 #else /* HAVE_NTGUI */
 359 #define ENCODE_MENU_STRING(str) (str)
 360 #endif
 361
 362 #if defined (HAVE_NS) || defined (HAVE_NTGUI) || defined (USE_GTK)
 363
 364 /* Definitions copied from lwlib.h */
 365
 366 enum button_type
 367 {
 368   BUTTON_TYPE_NONE,
 369   BUTTON_TYPE_TOGGLE,
 370   BUTTON_TYPE_RADIO
 371 };
 372
 373 /* This structure is based on the one in ../lwlib/lwlib.h, with unused portions
 374    removed.  No term uses these. */
 375 typedef struct _widget_value
 376 {
 377   /* name of widget */
 378   Lisp_Object   lname;
 379   const char*   name;
 380   /* value (meaning depend on widget type) */
 381   const char*   value;
 382   /* keyboard equivalent. no implications for XtTranslations */
 383   Lisp_Object   lkey;
 384   const char*   key;
 385   /* Help string or nil if none.
 386      GC finds this string through the frame's menu_bar_vector
 387      or through menu_items.  */
 388   Lisp_Object   help;
 389   /* true if enabled */
 390   unsigned char enabled;
 391   /* true if selected */
 392   unsigned char selected;
 393   /* The type of a button.  */
 394   enum button_type button_type;
 395 #if defined (HAVE_NTGUI)
 396   /* true if menu title */
 397   unsigned char title;
 398 #endif
 399   /* Contents of the sub-widgets, also selected slot for checkbox */
 400   struct _widget_value* contents;
 401   /* data passed to callback */
 402   void  *call_data;
 403   /* next one in the list */
 404   struct _widget_value* next;
 405 #ifdef USE_GTK
 406   struct _widget_value *free_list;
 407 #endif
 408 } widget_value;
 409
 410 #endif /* HAVE_NS || HAVE_NTGUI */
 411
 412 \f
 413 /* Macros for dealing with lispy events.  */
 414
 415 /* True if EVENT has data fields describing it (i.e. a mouse click).  */
 416 #define EVENT_HAS_PARAMETERS(event) (CONSP (event))
 417
 418 /* Extract the head from an event.
 419    This works on composite and simple events.  */
 420 #define EVENT_HEAD(event) \
 421   (EVENT_HAS_PARAMETERS (event) ? XCAR (event) : (event))
 422
 423 /* Extract the starting and ending positions from a composite event.  */
 424 #define EVENT_START(event) (CAR_SAFE (CDR_SAFE (event)))
 425 #define EVENT_END(event) (CAR_SAFE (CDR_SAFE (CDR_SAFE (event))))
 426
 427 /* Extract the click count from a multi-click event.  */
 428 #define EVENT_CLICK_COUNT(event) (Fnth (make_number (2), (event)))
 429
 430 /* Extract the fields of a position.  */
 431 #define POSN_WINDOW(posn) (CAR_SAFE (posn))
 432 #define POSN_POSN(posn) (CAR_SAFE (CDR_SAFE (posn)))
 433 #define POSN_SET_POSN(posn,x) (XSETCAR (XCDR (posn), (x)))
 434 #define POSN_WINDOW_POSN(posn) (CAR_SAFE (CDR_SAFE (CDR_SAFE (posn))))
 435 #define POSN_TIMESTAMP(posn) (CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (posn)))))
 436 #define POSN_SCROLLBAR_PART(posn)       (Fnth (make_number (4), (posn)))
 437
 438 /* A cons (STRING . STRING-CHARPOS), or nil in mouse-click events.
 439    It's a cons if the click is over a string in the mode line.  */
 440
 441 #define POSN_STRING(posn) (Fnth (make_number (4), (posn)))
 442
 443 /* If POSN_STRING is nil, event refers to buffer location.  */
 444
 445 #define POSN_INBUFFER_P(posn) (NILP (POSN_STRING (posn)))
 446 #define POSN_BUFFER_POSN(posn) (Fnth (make_number (5), (posn)))
 447
 448 /* Some of the event heads.  */
 449 extern Lisp_Object Qswitch_frame;
 450
 451 /* Properties on event heads.  */
 452 extern Lisp_Object Qevent_kind;
 453
 454 /* The values of Qevent_kind properties.  */
 455 extern Lisp_Object Qmouse_click;
 456
 457 extern Lisp_Object Qhelp_echo;
 458
 459 /* Getting the kind of an event head.  */
 460 #define EVENT_HEAD_KIND(event_head) \
 461   (Fget ((event_head), Qevent_kind))
 462
 463 /* Symbols to use for non-text mouse positions.  */
 464 extern Lisp_Object Qmode_line, Qvertical_line, Qheader_line;
 465
 466 /* True while doing kbd input.  */
 467 extern bool waiting_for_input;
 468
 469 /* Address (if not 0) of EMACS_TIME to zero out if a SIGIO interrupt
 470    happens.  */
 471 extern EMACS_TIME *input_available_clear_time;
 472
 473 #if defined HAVE_WINDOW_SYSTEM && !defined USE_GTK && !defined HAVE_NS
 474 extern bool ignore_mouse_drag_p;
 475 #endif
 476
 477 /* The primary selection.  */
 478 extern Lisp_Object QPRIMARY;
 479
 480 /* Forward declaration for prototypes.  */
 481 struct input_event;
 482
 483 extern Lisp_Object parse_modifiers (Lisp_Object);
 484 extern Lisp_Object reorder_modifiers (Lisp_Object);
 485 extern Lisp_Object read_char (int, Lisp_Object, Lisp_Object,
 486                               bool *, EMACS_TIME *);
 487 extern int parse_solitary_modifier (Lisp_Object symbol);
 488
 489
 490 /* This is like Vthis_command, except that commands never set it.  */
 491 extern Lisp_Object real_this_command;
 492
 493 /* Non-nil disable property on a command means
 494    do not execute it; call disabled-command-function's value instead.  */
 495 extern Lisp_Object QCtoggle, QCradio;
 496
 497 /* An event header symbol HEAD may have a property named
 498    Qevent_symbol_element_mask, which is of the form (BASE MODIFIERS);
 499    BASE is the base, unmodified version of HEAD, and MODIFIERS is the
 500    mask of modifiers applied to it.  If present, this is used to help
 501    speed up parse_modifiers.  */
 502 extern Lisp_Object Qevent_symbol_element_mask;
 503
 504 /* The timestamp of the last input event we received from the X server.
 505    X Windows wants this for selection ownership.  */
 506 extern Time last_event_timestamp;
 507
 508 extern int quit_char;
 509
 510 extern unsigned int timers_run;
 511
 512 extern bool menu_separator_name_p (const char *);
 513 extern bool parse_menu_item (Lisp_Object, int);
 514
 515 extern void init_kboard (KBOARD *);
 516 extern void delete_kboard (KBOARD *);
 517 extern void not_single_kboard_state (KBOARD *);
 518 extern void push_kboard (struct kboard *);
 519 extern void push_frame_kboard (struct frame *);
 520 extern void pop_kboard (void);
 521 extern void temporarily_switch_to_single_kboard (struct frame *);
 522 extern void record_asynch_buffer_change (void);
 523 extern void input_poll_signal (int);
 524 extern void start_polling (void);
 525 extern void stop_polling (void);
 526 extern void set_poll_suppress_count (int);
 527 extern int gobble_input (void);
 528 extern bool input_polling_used (void);
 529 extern void clear_input_pending (void);
 530 extern bool requeued_events_pending_p (void);
 531 extern void bind_polling_period (int);
 532 extern int make_ctrl_char (int) ATTRIBUTE_CONST;
 533 extern void stuff_buffered_input (Lisp_Object);
 534 extern void clear_waiting_for_input (void);
 535 extern void swallow_events (bool);
 536 extern bool lucid_event_type_list_p (Lisp_Object);
 537 extern void kbd_buffer_store_event (struct input_event *);
 538 extern void kbd_buffer_store_event_hold (struct input_event *,
 539                                          struct input_event *);
 540 extern void kbd_buffer_unget_event (struct input_event *);
 541 extern void poll_for_input_1 (void);
 542 extern void show_help_echo (Lisp_Object, Lisp_Object, Lisp_Object,
 543                             Lisp_Object);
 544 extern void gen_help_event (Lisp_Object, Lisp_Object, Lisp_Object,
 545                             Lisp_Object, ptrdiff_t);
 546 extern void kbd_buffer_store_help_event (Lisp_Object, Lisp_Object);
 547 extern Lisp_Object menu_item_eval_property (Lisp_Object);
 548 extern bool kbd_buffer_events_waiting (void);
 549 extern void add_user_signal (int, const char *);
 550
 551 extern int tty_read_avail_input (struct terminal *, struct input_event *);
 552 extern EMACS_TIME timer_check (void);
 553 extern void mark_kboards (void);
 554
 555 #ifdef HAVE_NTGUI
 556 extern const char *const lispy_function_keys[];
 557 #endif
 558
 559 INLINE_HEADER_END