MirBSD manpage: XtAppAddSignal(3), XtNoticeSignal(3), XtRemoveSignal(3)

XtAppAddSignal(3Xt)       XT FUNCTIONS        XtAppAddSignal(3Xt)


     XtAppAddSignal, XtRemoveSignal, XtNoticeSignal - register
     and remove a signal source


     XtSignalId XtAppAddSignal(XtAppContext app_context, XtSig-
          nalCallbackProc proc, XtPointer client_data);

     void XtRemoveSignal(XtSignalId id);

     void XtNoticeSignal(XtSignalId id);


               Specifies the application context.

               Specifies the argument that is to be passed to the
               specified procedure when a signal has been raised.

     id        Specifies the ID returned from the corresponding
               XtAppAddSignal call.

     proc      Specifies the procedure that is to be called when
               the signal has been raised.


     The XtAppAddSignal function initiates a mechanism for han-
     dling signals within the context of the Intrinsics. Prior to
     establishing an operating system dependent signal handler
     the application may call XtAppAddSignal and store the
     returned id in a place accessible to the signal handler.

     Upon receipt of a signal from the operating system, the
     application may call XtNoticeSignal passing the id returned
     by the call to XtAppAddSignal.

     XtNoticeSignal is the only Intrinsics function that can
     safely be called from a signal handler. If XtNoticeSignal is
     called multiple times before the Intrinsics are able to
     invoke the registered callback, the callback is only called
     once. Logically the Intrinsics maintain ``pending'' for each
     registered callback. This flag is initially False and is set
     to True by XtNoticeSignal; the Intrinsics invoke the call-
     back whenever the flag is True, and the flag is set to False
     just before the callback is invoked.

     The XtRemoveSignal function is called to remove the speci-
     fied Intrinsics signal handler. The client should disable
     the source of the signal before calling XtRemoveSignal.

XFree86                   Version 4.5.0                         1

XtAppAddSignal(3Xt)       XT FUNCTIONS        XtAppAddSignal(3Xt)


     X Toolkit Intrinsics - C Language Interface
     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         2

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