Path: utzoo!attcan!uunet!husc6!bloom-beacon!WHARTON.UPENN.EDU!JONES
From: JONES@WHARTON.UPENN.EDU
Newsgroups: comp.windows.x
Subject: Question on XtAddInput
Message-ID: <8902211446.AA26070@remote.dccs.upenn.edu>
Date: 21 Feb 89 14:44:00 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 39

The documentation that I have concerning XtAddInput is not particularly
clear.  

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

What is the condition?  My documentation says "Specifies the mask
that indicates either a read, write, or exception condition or an operating
system dependent condition"  Does this mean that it can be of type
XEventMask (e.g., KeyPressMask)?

Secondly, can the source be of type FILE, e.g., stdin?  If not, what is passed.
My documentation says that source "specifies the source file descriptor on a 
dependent-device specification?"

Thirdly, is there some example code that demonstrates the use of XtAddInput?

Finally, once one sets up put handler correctly, if one calls XtNextEvent,
when an input event occurs, what type of event does XtNextEvent return?

I am interested in this because I need to interleave standard input from
the terminal (via xterm) with some widget events.  

I'm running X11 R2 on an IBM RT running AIX version 2.2.1.


Thanks.

Chris Jones
The Wharton School
The University of Pennsylvania
Philadelphia, PA 19104

215-898-7290

JONES@WHARTON.UPENN.EDU