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XtAppAddSignal(3)                               XT FUNCTIONS                               XtAppAddSignal(3)



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

SYNTAX
       XtSignalId XtAppAddSignal(XtAppContext app_context, XtSignalCallbackProc proc, XtPointer
              client_data);

       void XtRemoveSignal(XtSignalId id);

       void XtNoticeSignal(XtSignalId id);

ARGUMENTS
       app_context
                 Specifies the application context.

       client_data
                 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.

DESCRIPTION
       The XtAppAddSignal function initiates a mechanism for handling 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 call-back, callback,
       back, the callback is only called once. Logically the Intrinsics maintain ``pending'' for each regis-tered registered
       tered callback. This flag is initially False and is set to True by XtNoticeSignal; the Intrinsics
       invoke the callback 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 specified Intrinsics signal handler. The client
       should disable the source of the signal before calling XtRemoveSignal.

SEE ALSO
       XtAppAddTimeOut(3Xt),XtAppAddInput(3Xt),XtAppAddWorkProc(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface



X Version 11                                     libXt 1.0.5                               XtAppAddSignal(3)