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NAME

       XChangeKeyboardControl,   XGetKeyboardControl,   XAutoRepeatOn,   XAutoRepeatOff,   XBell,
       XQueryKeymap,  XKeyboardControl  -  manipulate  keyboard  settings  and  keyboard  control
       structure

SYNTAX

       int  XChangeKeyboardControl(Display  *display,  unsigned long value_mask, XKeyboardControl
              *values);

       int XGetKeyboardControl(Display *display, XKeyboardState *values_return);

       int XAutoRepeatOn(Display *display);

       int XAutoRepeatOff(Display *display);

       int XBell(Display *display, int percent);

       int XQueryKeymap(Display *display, char keys_return[32]);

ARGUMENTS

       display   Specifies the connection to the X server.

       keys_return
                 Returns an array of bytes that identifies which keys are pressed down.  Each bit
                 represents one key of the keyboard.

       percent   Specifies the volume for the bell, which can range from -100 to 100 inclusive.

       value_mask
                 Specifies  which  controls  to change.  This mask is the bitwise inclusive OR of
                 the valid control mask bits.

       values    Specifies one value for each bit set to 1 in the mask.

       values_return
                 Returns the current keyboard controls in the specified XKeyboardState structure.

DESCRIPTION

       The XChangeKeyboardControl function controls the keyboard characteristics defined  by  the
       XKeyboardControl  structure.   The  value_mask  argument  specifies which values are to be
       changed.

       XChangeKeyboardControl can generate BadMatch and BadValue errors.

       The XGetKeyboardControl function returns the current control values for  the  keyboard  to
       the XKeyboardState structure.

       The XAutoRepeatOn function turns on auto-repeat for the keyboard on the specified display.

       The  XAutoRepeatOff  function  turns  off  auto-repeat  for  the keyboard on the specified
       display.

       The XBell function rings the bell on the keyboard on the specified display,  if  possible.
       The  specified  volume  is relative to the base volume for the keyboard.  If the value for
       the percent argument is not in the range -100 to 100 inclusive, a BadValue error  results.
       The volume at which the bell rings when the percent argument is nonnegative is:

              base - [(base * percent) / 100] + percent

       The volume at which the bell rings when the percent argument is negative is:

              base + [(base * percent) / 100]

       To change the base volume of the bell, use XChangeKeyboardControl.

       XBell can generate a BadValue error.

       The  XQueryKeymap  function  returns  a  bit vector for the logical state of the keyboard,
       where each bit set to 1 indicates that the corresponding key is  currently  pressed  down.
       The  vector  is represented as 32 bytes.  Byte N (from 0) contains the bits for keys 8N to
       8N + 7 with the least significant bit in the byte representing key 8N.

       Note that the logical state of a device (as seen  by  client  applications)  may  lag  the
       physical state if device event processing is frozen.

STRUCTURES

       The XKeyboardControl structure contains:

       /* Mask bits for ChangeKeyboardControl */

       #define   KBKeyClickPercent           (1L<<0)
       #define   KBBellPercent               (1L<<1)
       #define   KBBellPitch                 (1L<<2)
       #define   KBBellDuration              (1L<<3)
       #define   KBLed                       (1L<<4)
       #define   KBLedMode                   (1L<<5)
       #define   KBKey                       (1L<<6)
       #define   KBAutoRepeatMode            (1L<<7)
       /* Values */

       typedef struct {
               int key_click_percent;
               int bell_percent;
               int bell_pitch;
               int bell_duration;
               int led;
               int led_mode;   /* LedModeOn, LedModeOff */
               int key;
               int auto_repeat_mode;   /* AutoRepeatModeOff, AutoRepeatModeOn,
                                       AutoRepeatModeDefault */
       } XKeyboardControl;

       The key_click_percent member sets the volume for key clicks between 0 (off) and 100 (loud)
       inclusive,  if  possible.   A  setting  of -1 restores the default.  Other negative values
       generate a BadValue error.

       The bell_percent sets the base volume  for  the  bell  between  0  (off)  and  100  (loud)
       inclusive,  if  possible.   A  setting  of -1 restores the default.  Other negative values
       generate a BadValue error.  The bell_pitch member sets the pitch (specified in Hz) of  the
       bell,  if possible.  A setting of -1 restores the default.  Other negative values generate
       a BadValue error.  The bell_duration member sets the duration of  the  bell  specified  in
       milliseconds,  if  possible.  A setting of -1 restores the default.  Other negative values
       generate a BadValue error.

       If both the led_mode and led members are specified, the state of that LED is  changed,  if
       possible.  The led_mode member can be set to LedModeOn or LedModeOff.  If only led_mode is
       specified, the state of all LEDs are changed, if possible.  At most 32 LEDs numbered  from
       one  are  supported.   No standard interpretation of LEDs is defined.  If led is specified
       without led_mode, a BadMatch error results.

       If both the auto_repeat_mode and key members are specified, the auto_repeat_mode  of  that
       key     is    changed    (according    to    AutoRepeatModeOn,    AutoRepeatModeOff,    or
       AutoRepeatModeDefault), if possible.  If only auto_repeat_mode is  specified,  the  global
       auto_repeat_mode  for the entire keyboard is changed, if possible, and does not affect the
       per-key settings.  If a key is specified without an  auto_repeat_mode,  a  BadMatch  error
       results.   Each  key  has an individual mode of whether or not it should auto-repeat and a
       default setting for the mode.  In addition, there is a global mode of whether  auto-repeat
       should  be  enabled  or  not  and  a  default  setting for that mode.  When global mode is
       AutoRepeatModeOn, keys should obey their individual auto-repeat modes.  When  global  mode
       is  AutoRepeatModeOff,  no  keys  should  auto-repeat.   An  auto-repeating  key generates
       alternating KeyPress and KeyRelease events.  When a key is  used  as  a  modifier,  it  is
       desirable for the key not to auto-repeat, regardless of its auto-repeat setting.

       The XKeyboardState structure contains:

       typedef struct {
               int key_click_percent;
               int bell_percent;
               unsigned int bell_pitch, bell_duration;
               unsigned long led_mask;
               int global_auto_repeat;
               char auto_repeats[32];
       } XKeyboardState;

       For  the  LEDs, the least significant bit of led_mask corresponds to LED one, and each bit
       set to 1 in led_mask indicates an LED that is lit.  The global_auto_repeat member  can  be
       set  to  AutoRepeatModeOn  or AutoRepeatModeOff.  The auto_repeats member is a bit vector.
       Each bit set to 1 indicates that auto-repeat is enabled for the  corresponding  key.   The
       vector  is represented as 32 bytes.  Byte N (from 0) contains the bits for keys 8N to 8N +
       7 with the least significant bit in the byte representing key 8N.

DIAGNOSTICS

       BadMatch  Some argument or pair of arguments has the correct type and range but  fails  to
                 match in some other way required by the request.

       BadValue  Some  numeric  value  falls outside the range of values accepted by the request.
                 Unless a specific range is specified for an argument, the full range defined  by
                 the  argument's type is accepted.  Any argument defined as a set of alternatives
                 can generate this error.

SEE ALSO

       XChangeKeyboardMapping(3),  XkbChangeEnabledControls(3),   XkbBell(3),   XkbDeviceBell(3),
       XkbGetMap(3), XSetPointerMapping(3)
       Xlib - C Language X Interface