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);