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To:	Eugene Kanter <eugene AT bgs DOT com>
cc:	cygwin AT sourceware DOT cygnus DOT com
Subject:	Re: putenv does not put env into win32?
In-reply-to:	Your message of "Wed, 28 Apr 1999 12:22:31 EDT."
	<372735C7 DOT 912BE891 AT bgs DOT com>
Date:	Wed, 28 Apr 1999 12:03:42 -0500
From:	Mumit Khan <khan AT xraylith DOT wisc DOT EDU>

Eugene Kanter <eugene AT bgs DOT com> writes:
> 
> I guess cygwin putenv() MUST call SetEnvironmentVariable() at the end. I
> see no excuses for that.

Chris/Geoffrey/DJ can comment on the reason, but I'd guess it's mostly a
performance related issue.

> Just for test, I tried to call just SetEnvironmentVariable() and it does
> not update cygwin variable. Are there the different sets of variables?

Cygwin caches the environment variables at startup by calling
GetEnvironmentStrings and then uses its local copies. Performance
again. Using cygwin_conv_* routines are rather heavy-weight.

Perhaps there is a set of env variables, such as PATH, that should always 
be kept in sync at the expense of a little performance loss? 

Regards,
Mumit


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