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From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  Ways to detect what window system is running.
Message-ID: <9104130354.AA09118@lightning.McRCIM.McGill.EDU>
Date: 13 Apr 91 03:54:54 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 23

> I am looking for scripts or ideas for how to detect what window
> system is running.  We need to run different versions of the same
> program when under X Windows or SunView.

(Assuming that by "X Windows" you mean The X Window System, or X for
short....)

The usual thing to do is to check for DISPLAY in the environment, which
implies X, or WINDOW_PARENT, which implies SunView.  (If both are set,
you are probably in some environment where either one will work, so use
whichever provides a better interface for your program.)

> Ways to detect Sun's X News server and MIT X would be helpful as
> well.

Check the vendor string (see XServerVendor() and possibly
XVendorRelease() in the Xlib documentation).  The MIT server I'm using
now returns "MIT X Consortium" and "4", at least according to xdpyinfo.

					der Mouse

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