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XtAddInput()							  XtAddInput()

Name
  XtAddInput  -	 register a procedure to be called when there is activity
  on a file descriptor.

Synopsis
  XtInputId XtAddInput(source, condition, proc, client_data)
	 int source;
	 XtPointer condition;
	 XtInputCallbackProc proc;
	 XtPointer client_data;

Inputs
  source    Specifies the file descriptor (on a	 POSIX-based  system)  to
	    monitor.

  condition Specifies  a  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	condition
	    occurs on source.

  client_data
	    Specifies data to be passed to proc when it is invoked.

Returns
  A  handle  of	 type  XtInputId that can be passed to XtRemoveInput() to
  unregister this input procedure.

Availability
  Superseded by XtAppAddInput().

Description
  XtAddInput() registers a file descriptor  source  to	be  monitored  by
  XtAppNextEvent()   and   a  procedure	 proc  to  be  called  with  data
  client_data when the condition (such as "input ready" or "error")  con‐
  dition arises.

  On a POSIX-based system, the supported values for condition are XtInpu‐
  tReadMask, XtInputWriteMask, or XtInputExceptMask.  These values cannot
  be ORed together.

Usage
  XtAddInput() has been superseded by XtAppAddInput(), which performs the
  same function on a per-application  context  basis.	XtAddInput()  now
  calls	 XtAppAddInput()  passing the default application context created
  by XtInitialize().  Very few programs need  multiple	application  con‐
  texts,  and you can continue to use XtAddInput() if you initialize your
  application with XtInitialize().  We recommend, however, that	 you  use
  XtAppInitialize(),  XtAppAddInput(), and the other XtApp*() application
  context specific functions.

  See XtAppAddInput() for more information.

See Also
  XtAppAddInput(1), XtRemoveInput(1),
  XtInputCallbackProc(2).

Xt - Event Handling						  XtAddInput()

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