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XtAddInput, XtAddTimeout - register input,
timeout, and workprocs 
XtInputId XtAddInput(source, condition, proc,
client_data) 
      int source;
 
      XtPointer condition;
 
      XtInputCallbackProc proc;
 
      XtPointer client_data;
 
XtIntervalId XtAddTimeout(interval, proc, client_data) 
      unsigned long interval;
 
      XtInputCallbackProc proc;
 
      XtPointer client_data;
 
XtWorkProcId XtAddWorkProc(proc, client_data) 
      XtWorkProc proc;
 
      XtPointer client_data;
 
- 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. 
- 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.
XtAddInput   has been replaced by XtAppAddInput.
XtAddTimeout
  has been replaced by XtAppAddTimeout.   
XtAddWorkProc   has been replaced
by XtAppAddWorkProc.   
X Toolkit Intrinsics - C Language Interface 
Xlib - C Language X Interface 
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