NAME

       XtAppAddInput, XtRemoveInput - register and remove an input source

SYNTAX

       #include <X11/Intrinsic.h>

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

       void XtRemoveInput(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(3),XtAppAddSignal(3)
       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);