XGrabKeyboard(3X11)

NAME
       XGrabKeyboard, XUngrabKeyboard - grab the keyboard

SYNTAX
       int XGrabKeyboard(display, grab_window, owner_events,
       pointer_mode, keyboard_mode, time)
             Display *display;
             Window grab_window;
             Bool owner_events;
             int pointer_mode, keyboard_mode;
             Time time;

       XUngrabKeyboard(display, time)
             Display *display;
             Time time;

ARGUMENTS
       display   Specifies the connection to the X server.

       grab_window
                 Specifies the grab window.

       keyboard_mode
                 Specifies further processing of keyboard events.
                 You can pass GrabModeSync or GrabModeAsync.

       owner_events
                 Specifies a Boolean value that indicates whether
                 the keyboard events are to be reported as usual.

       pointer_mode
                 Specifies further processing of pointer events.
                 You can pass GrabModeSync or GrabModeAsync.

       time      Specifies the time.  You can pass either a
                 timestamp or CurrentTime.

DESCRIPTION
       The XGrabKeyboard function actively grabs control of the
       keyboard and generates FocusIn and FocusOut events.  Fur-
       ther key events are reported only to the grabbing client.
       XGrabKeyboard overrides any active keyboard grab by this
       client.  If owner_events is False, all generated key
       events are reported with respect to grab_window.  If
       owner_events is True and if a generated key event would
       normally be reported to this client, it is reported nor-
       mally; otherwise, the event is reported with respect to
       the grab_window.  Both KeyPress and KeyRelease events are
       always reported, independent of any event selection made
       by the client.

       If the keyboard_mode argument is GrabModeAsync, keyboard
       event processing continues as usual.  If the keyboard is
       currently frozen by this client, then processing of

       keyboard events is resumed.  If the keyboard_mode  argu-
       ment is GrabModeSync, the state of the keyboard (as seen
       by client applications) appears to freeze, and the X
       server generates no further keyboard events until the
       grabbing client issues a releasing XAllowEvents call or
       until the keyboard grab is released.  Actual keyboard
       changes are not lost while the keyboard is frozen; they
       are simply queued in the server for later processing.

       If pointer_mode is GrabModeAsync, pointer event processing
       is unaffected by activation of the grab.  If pointer_mode
       is GrabModeSync, the state of the pointer (as seen by
       client applications) appears to freeze, and the X server
       generates no further pointer events until the grabbing
       client issues a releasing XAllowEvents call or until the
       keyboard grab is released.  Actual pointer changes are not
       lost while the pointer is frozen; they are simply queued
       in the server for later processing.

       If the keyboard is actively grabbed by some other client,
       XGrabKeyboard fails and returns AlreadyGrabbed.  If
       grab_window is not viewable, it fails and returns
       GrabNotViewable.  If the keyboard is frozen by an active
       grab of another client, it fails and returns GrabFrozen.
       If the specified time is earlier than the last-keyboard-
       grab time or later than the current X server time, it
       fails and returns GrabInvalidTime.  Otherwise, the last-
       keyboard-grab time is set to the specified time (Current-
       Time is replaced by the current X server time).

       XGrabKeyboard can generate BadValue and BadWindow errors.

       The XUngrabKeyboard function releases the keyboard and any
       queued events if this client has it actively grabbed from
       either XGrabKeyboard or XGrabKey.  XUngrabKeyboard does
       not release the keyboard and any queued events if the
       specified time is earlier than the last-keyboard-grab time
       or is later than the current X server time.  It also gen-
       erates FocusIn and FocusOut events.  The X server automat-
       ically performs an UngrabKeyboard request if the event
       window for an active keyboard grab becomes not viewable.

DIAGNOSTICS
       BadValue  Some numeric value falls outside the range of
                 values accepted by the request.  Unless a spe-
                 cific 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.

       BadWindow A value for a Window argument does not name a
                 defined Window.

SEE ALSO
       XAllowEvents(3X11) XGrabButton(3X11) XGrabKey(3X11) 
       XGrabPointer(3X11) 
       Xlib - C Language X Interface