XCheckIfEvent man page on Ultrix

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XIfEvent(3X11)			     X11R5			XIfEvent(3X11)

NAME
       XIfEvent, XCheckIfEvent, XPeekIfEvent - check the event queue with a
       predicate procedure

SYNTAX
       XIfEvent(display, event_return, predicate, arg)
	     Display *display;
	     XEvent *event_return;
	     Bool (*predicate)();
	     XPointer arg;

       Bool XCheckIfEvent(display, event_return, predicate, arg)
	     Display *display;
	     XEvent *event_return;
	     Bool (*predicate)();
	     XPointer arg;

       XPeekIfEvent(display, event_return, predicate, arg)
	     Display *display;
	     XEvent *event_return;
	     Bool (*predicate)();
	     XPointer arg;

ARGUMENTS
       arg	 Specifies the user-supplied argument that will be passed to
		 the predicate procedure.

       display	 Specifies the connection to the X server.

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

       predicate Specifies the procedure that is to be called to determine if
		 the next event in the queue matches what you want.

DESCRIPTION
       The function completes only when the specified predicate procedure
       returns for an event, which indicates an event in the queue matches.
       flushes the output buffer if it blocks waiting for additional events.
       removes the matching event from the queue and copies the structure into
       the client-supplied structure.

       When the predicate procedure finds a match, copies the matched event
       into the client-supplied structure and returns (This event is removed
       from the queue.)	 If the predicate procedure finds no match, returns
       and the output buffer will have been flushed.  All earlier events
       stored in the queue are not discarded.

       The function returns only when the specified predicate procedure
       returns for an event.  After the predicate procedure finds a match,
       copies the matched event into the client-supplied structure without
       removing the event from the queue.  flushes the output buffer if it
       blocks waiting for additional events.

SEE ALSO
       XAnyEvent(3X11), XNextEvent(3X11), XPutBackEvent(3X11) XSendEvent(3X11)
       Xlib - C Language X Interface

								XIfEvent(3X11)
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