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NAME

       XNextEvent,  XPeekEvent,  XWindowEvent,  XCheckWindowEvent,  XMaskEvent,  XCheckMaskEvent,
       XCheckTypedEvent, XCheckTypedWindowEvent - select events by type

SYNTAX

       int XNextEvent(Display *display, XEvent *event_return);

       int XPeekEvent(Display *display, XEvent *event_return);

       int XWindowEvent(Display *display, Window w, long event_mask, XEvent *event_return);

       Bool XCheckWindowEvent(Display *display, Window w, long event_mask, XEvent *event_return);

       int XMaskEvent(Display *display, long event_mask, XEvent *event_return);

       Bool XCheckMaskEvent(Display *display, long event_mask, XEvent *event_return);

       Bool XCheckTypedEvent(Display *display, int event_type, XEvent *event_return);

       Bool  XCheckTypedWindowEvent(Display  *display,   Window   w,   int   event_type,   XEvent
              *event_return);

ARGUMENTS

       display   Specifies the connection to the X server.

       event_mask
                 Specifies the event mask.

       event_return
                 Returns the matched event's associated structure.

       event_return
                 Returns the next event in the queue.

       event_return
                 Returns a copy of the matched event's associated structure.

       event_type
                 Specifies the event type to be compared.

       w         Specifies the window whose event you are interested in.

DESCRIPTION

       The  XNextEvent  function  copies  the first event from the event queue into the specified
       XEvent structure and then removes it from  the  queue.   If  the  event  queue  is  empty,
       XNextEvent flushes the output buffer and blocks until an event is received.

       The  XPeekEvent  function  returns  the  first event from the event queue, but it does not
       remove the event from the queue.  If the queue is empty,  XPeekEvent  flushes  the  output
       buffer  and  blocks until an event is received.  It then copies the event into the client-
       supplied XEvent structure without removing it from the event queue.

       The XWindowEvent function searches the event queue for an  event  that  matches  both  the
       specified  window  and event mask.  When it finds a match, XWindowEvent removes that event
       from the queue and copies it into the specified XEvent structure.  The other events stored
       in  the  queue  are  not discarded.  If a matching event is not in the queue, XWindowEvent
       flushes the output buffer and blocks until one is received.

       The XCheckWindowEvent function searches the event queue and then the events  available  on
       the  server  connection  for  the  first event that matches the specified window and event
       mask.  If it finds a match, XCheckWindowEvent removes  that  event,  copies  it  into  the
       specified  XEvent  structure,  and returns True.  The other events stored in the queue are
       not discarded.  If the event you requested is  not  available,  XCheckWindowEvent  returns
       False, and the output buffer will have been flushed.

       The  XMaskEvent  function  searches  the  event  queue  for the events associated with the
       specified mask.  When it finds a match, XMaskEvent removes that event and copies  it  into
       the  specified  XEvent structure.  The other events stored in the queue are not discarded.
       If the event you requested is not in the queue, XMaskEvent flushes the output  buffer  and
       blocks until one is received.

       The XCheckMaskEvent function searches the event queue and then any events available on the
       server connection for the first event that matches the specified  mask.   If  it  finds  a
       match,  XCheckMaskEvent removes that event, copies it into the specified XEvent structure,
       and returns True.  The other events stored in the queue are not discarded.  If  the  event
       you  requested is not available, XCheckMaskEvent returns False, and the output buffer will
       have been flushed.

       The XCheckTypedEvent function searches the event queue and then any  events  available  on
       the  server connection for the first event that matches the specified type.  If it finds a
       match, XCheckTypedEvent removes that event, copies it into the specified XEvent structure,
       and  returns  True.  The other events in the queue are not discarded.  If the event is not
       available, XCheckTypedEvent returns False, and the output buffer will have been flushed.

       The XCheckTypedWindowEvent function searches the event queue and then any events available
       on  the  server connection for the first event that matches the specified type and window.
       If it finds a match, XCheckTypedWindowEvent removes the event from the  queue,  copies  it
       into  the specified XEvent structure, and returns True.  The other events in the queue are
       not discarded.  If the event is not available, XCheckTypedWindowEvent returns  False,  and
       the output buffer will have been flushed.

SEE ALSO

       XAnyEvent(3), XIfEvent(3), XPutBackEvent(3), XSendEvent(3)
       Xlib - C Language X Interface