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Tk_CreateGenericHandler(3Tk)			  Tk_CreateGenericHandler(3Tk)

NAME
     Tk_CreateGenericHandler, Tk_DeleteGenericHandler - associate procedure
     callback with all X events

SYNOPSIS
     #include <tk.h>

     Tk_CreateGenericHandler(proc, clientData)

     Tk_DeleteGenericHandler(proc, clientData)

ARGUMENTS
     Tk_GenericProc   *proc	   (in)	     Procedure to invoke whenever any
					     X event occurs on any display.

     ClientData	      clientData   (in)	     Arbitrary one-word value to pass
					     to proc.

DESCRIPTION
     Tk_CreateGenericHandler arranges for proc to be invoked in the future
     whenever any X event occurs.  This mechanism is not intended for
     dispatching X events on windows managed by Tk (you should use
     Tk_CreateEventHandler for this purpose).  Tk_CreateGenericHandler is
     intended for other purposes, such as tracing X events, monitoring events
     on windows not owned by Tk, accessing X-related libraries that were not
     originally designed for use with Tk, and so on.

     The callback to proc will be made by Tk_HandleEvent; this mechanism only
     works in programs that dispatch events through Tk_HandleEvent (or through
     other Tk procedures that call Tk_HandleEvent, such as Tk_DoOneEvent or
     Tk_MainLoop).

     Proc should have arguments and result that match the type Tk_GenericProc:
	  typedef int Tk_GenericProc(
	       ClientData clientData,
	       XEvent *eventPtr);
     The clientData parameter to proc is a copy of the clientData argument
     given to Tk_CreateGenericHandler when the callback was created.
     Typically, clientData points to a data structure containing application-
     specific information about how to handle events.  EventPtr is a pointer
     to the X event.

     Whenever an X event is processed by Tk_HandleEvent, proc is called.  The
     return value from proc is normally 0.  A non-zero return value indicates
     that the event is not to be handled further; that is, proc has done all
     processing that is to be allowed for the event.

     If there are multiple generic event handlers, each one is called for each
     event, in the order in which they were established.

									Page 1

Tk_CreateGenericHandler(3Tk)			  Tk_CreateGenericHandler(3Tk)

     Tk_DeleteGenericHandler may be called to delete a previously-created
     generic event handler:  it deletes each handler it finds that matches the
     proc and clientData arguments.  If no such handler exists, then
     Tk_DeleteGenericHandler returns without doing anything.  Although Tk
     supports it, it's probably a bad idea to have more than one callback with
     the same proc and clientData arguments.

     Establishing a generic event handler does nothing to ensure that the
     process will actually receive the X events that the handler wants to
     process.  For example, it is the caller's responsibility to invoke
     XSelectInput to select the desired events, if that is necessary.

KEYWORDS
     bind, callback, event, handler

									Page 2

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