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CentOS 7.0 - man page for xtappaddinput (centos section 3)

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XtAppAddInput(3)			   XT FUNCTIONS 			 XtAppAddInput(3)

       XtAppAddInput, XtRemoveInput - register and remove an input source

       XtInputId XtAppAddInput(XtAppContext app_context, int source, XtPointer condition, XtIn-
	      putCallbackProc proc, XtPointer client_data);

       void XtRemoveInput(XtInputId id);

		 Specifies the application context that identifies the application.

		 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.

       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 XtIn-
       putExceptMask.  The XtRemoveInput function causes the Intrinsics read routine to stop
       watching for input from the input source.

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

       In ANSI C it is necessary to cast the condition to an XtPointer, e.g.:
	       (XtPointer) (XtInputReadMask | XtInputWriteMask),

X Version 11				   libXt 1.1.4				 XtAppAddInput(3)
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