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Date: Fri, 14 Sep 2001 15:01:07 +0200
From: Corinna Vinschen <vinschen AT redhat DOT com>
To: cygwin-developers AT cygwin DOT com
Subject: Re: Proposal: check and read /etc/{passwd,group} less frequently.
Message-ID: <20010914150107.E25339@cygbert.vinschen.de>
Reply-To: cygdev <cygwin-developers AT cygwin DOT com>
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References: <EA18B9FA0FE4194AA2B4CDB91F73C0EF08F177 AT itdomain002 DOT itdomain DOT net DOT au> <s1su1y6qlam DOT fsf AT jaist DOT ac DOT jp> <s1sd74uufha DOT fsf AT jaist DOT ac DOT jp>
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In-Reply-To: <s1sd74uufha.fsf@jaist.ac.jp>; from fujieda@jaist.ac.jp on Fri, Sep 14, 2001 at 09:25:05PM +0900

On Fri, Sep 14, 2001 at 09:25:05PM +0900, Kazuhiro Fujieda wrote:
> >>> On 14 Sep 2001 16:33:05 +0900
> >>> Kazuhiro Fujieda <fujieda AT jaist DOT ac DOT jp> said:
> 
> > > How often is internal_getlogin called relative to get(p|g)w*?
> > 
> > It is in set{g,u}id and uinfo_init. At the user's point of view, 
> > the cache is updated only when they execute another command.
> 
> Oops, I've told a lie. it's a nonsense that internal_getlogin
> invokes read_etc{passwd,group}. I tested it and found it
> couldn't work as I intended. 
> 
> I'd like to change the proposal. Checking and reading
> /etc/{passwd,group} should be held in uinfo_init.

What about a long running server process e.g. started from cygrunsrv?
It runs uinfo_init() just once at the beginning.  It would never get
the changes to /etc/passwd and /etc/group since it needs that info
_before_ changing the user context (which would call internal_getlogin()
directly from seteuid(), btw. -- no uinfo_init() at all).

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.