Path: utzoo!attcan!uunet!wuarchive!usc!cs.utexas.edu!asuvax!ncar!boulder!stan!ninja!toml
From: toml@ninja.Solbourne.COM (Tom LaStrange)
Newsgroups: comp.windows.x
Subject: Re: ICCCM and colormaps---simple question
Message-ID: <1990Feb14.144147.22813@Solbourne.COM>
Date: 14 Feb 90 14:41:47 GMT
Sender: news@Solbourne.COM
Organization: Solbourne Computer, Inc.
Lines: 22

>> ...  I was also wondering; instead of having
>> the user specify that no window manager is running, is there a
>> way for the application to automatically detect that?  For example,
>> twm seems to be able to detect that another window manager is
>> already running;
>
>Twm detects another window manager when calling XSelectInput on the root
>window.  If this call fails, it assumes that another wm is there.  (Only
>one client is allowed to select button press events on a window).


Almost.  It's actually the SubstructureRedirectMask that only one client
is allowed to do.  While this will work most of the time to determine
if a window manager is running, I don't think there's anyway to determine
if the window manager goes away later.

--
Tom LaStrange

Solbourne Computer Inc.    ARPA: toml@Solbourne.COM
1900 Pike Rd.              UUCP: ...!{boulder,sun}!stan!toml
Longmont, CO  80501