MPT_EVENT_REGISTER(9) Message-based devices MPT_EVENT_REGISTER(9)NAME
mpt_event_register - Register protocol-specific event callback handler.
SYNOPSIS
int mpt_event_register(u8 cb_idx, MPT_EVHANDLER ev_cbfunc);
ARGUMENTS
cb_idx
previously registered (via mpt_register) callback handle
ev_cbfunc
callback function
DESCRIPTION
This routine can be called by one or more protocol-specific drivers if/when they choose to be notified of MPT events.
Returns 0 for success.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MPT_EVENT_REGISTER(9)
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Tk_CreateGenericHandler(3) Tk Library Procedures Tk_CreateGenericHandler(3)__________________________________________________________________________________________________________________________________________________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 dis-
patching 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. Typ-
ically, 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.
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
TkTk_CreateGenericHandler(3)
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