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

XtAppAddInput(3)				     XT FUNCTIONS				     XtAppAddInput(3)

XtAppAddInput, XtRemoveInput - register and remove an input source
XtInputId XtAppAddInput(XtAppContext app_context, int source, XtPointer condition, XtInputCallbackProc proc, XtPointer client_data); void XtRemoveInput(XtInputId id);
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.
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 con- dition 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.
XtAppAddTimeOut(3),XtAppAddSignal(3) 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.: XtAppAddInput(app_context, source, (XtPointer) (XtInputReadMask | XtInputWriteMask), proc, client_data); X Version 11 libXt 1.1.4 XtAppAddInput(3)

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