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Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations)




On Nov 19, 2007, at 10:04 AM, Derek Fawcus wrote:

What is _gained_ my using an alternate socket, that could not have been achieved
without it. Similarly what is _gained_ by defining a new interpretation for DISPLAY,
that could not have been hidden in the x11 transport library?


So far all I can see is that two other programs (xauth, ssh) had to be updated
to cope with the new DISPLAY contents.

Other programs are affected. For example, the standard astronomer's tool "ds9" just doesn't work with the new DISPLAY format. Luckily it can be recompiled under Leopard (although right now the people in charge of DS9 are advising that Leopard X11 users simply set their DISPLAY variable to ":0", advise which might raise a few hackles around here), but I'm wondering how long before someone comes along with a commercial X11 based app that breaks because of this change (although admittedly this is unlikely as Macs don't have too many commercial X11 apps). My feeling is that if someone like Sun made a change to the DISPLAY variable like this they'd break hundreds of commercial apps and their users would be screaming, but with Apple X11 is for "hobbyists" or "developers" who don't mind fixing apps that it breaks.


For the record I like the implementation of the auto X11 launching, I just can see that maintainers of X11 apps that this breaks on Leopard are going to see this as an "Apple Issue" rather than a problem in their own code. You're going to end up with advice on like what the ds9 site currently says, which is not necessarily the best solution (BTW: http://hea-www.harvard.edu/RD/ds9/issue.html).

Jamie
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References: 
 >Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations) (From: Derek Fawcus <email@hidden>)
 >Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations) (From: Ben Byer <email@hidden>)
 >Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations) (From: Derek Fawcus <email@hidden>)
 >Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations) (From: "Andrew J. Hesford" <email@hidden>)
 >Re: The meaning(s) of $DISPLAY (was Re: Explanation of X implementations) (From: Derek Fawcus <email@hidden>)



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