XtAppAddInput(3Xt) X Version 11 (Release 6.6)  XtAppAddInput(3Xt)


     NAME
          XtAppAddInput, XtRemoveInput - register and remove an input
          source

     SYNTAX
          XtInputId XtAppAddInput(app_context, source, condition,
          proc, client_data)
                XtAppContext app_context;
                int source;
                XtPointer condition;
                XtInputCallbackProc proc;
                XtPointer client_data;

          void XtRemoveInput(id)
                XtInputId id;

     ARGUMENTS
          app_context
                    Specifies the application context that identifies
                    the application.

          client_data
                    Specifies the argument that is to be passed to the
                    specified procedure when input is available.

          condition Specifies the mask that indicates a read, write,
                    or exception condition or some operating system
                    dependent condition.

          id        Specifies the ID returned from the corresponding
                    XtAppAddInput call.

          proc      Specifies the procedure that is to be called when
                    input is available.

          source    Specifies the source file descriptor on a UNIX-
                    based system or other operating system dependent
                    device specification.

     DESCRIPTION
          The XtAppAddInput function registers with the Intrinsics
          read routine a new source of events, which is usually file
          input but can also be file output.  Note that file should be
          loosely interpreted to mean any sink or source of data.
          XtAppAddInput also specifies the conditions under which the
          source can generate events.  When input is pending on this
          source, the callback procedure is called.

          The legal values for the condition argument are operating-
          system dependent.  On a UNIX-based system, the condition is
          some union of XtInputReadMask, XtInputWriteMask, and
          XtInputExceptMask.  The XtRemoveInput function causes the


          Intrinsics read routine to stop watching for input from the
          input source.

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

     BUGS
          In ANSI C it is necessary to cast the condition to an
          XtPointer, e.g.:
              XtAppAddInput(app_context,
                  source,
                  (XtPointer) XtInputReadMask | XtInputWriteMask,
                  proc,
                  client_data);


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