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 identi-
                 fies 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);