Date: Thu, 6 Jan 2000 23:02:07 +0100 (CET) From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de> To: freebsd-questions@FreeBSD.ORG Subject: Re: login classes info Message-ID: <200001062202.XAA33020@dorifer.heim3.tu-clausthal.de> In-Reply-To: <8522ol$2vpm$1@atlantis.rz.tu-clausthal.de>
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Sue Blake <sue@ahimsa.welearn.com.au> wrote in list.freebsd-questions:
> Is there anything I can read to expand on what I've already read
> in the man pages? Perhaps a more verbose How-To or explanation of
> some terms? For example, terms like "datasize" don't have a lot
> of meaning right now and I might be missing out on some useful ways
> to tweak the login.conf file.
"Datasize" is the size of the data segment of a process (i.e.
its variable data). Basically, the amount of memory it can
malloc (simply speaking). This is opposed to the "textsize" of
a process, which is its actual program code, and the "stack-
size" which is used for storing local variables and return
addresses of functions.
To be honest, I don't know where these terms are explained.
I think I've read about them in a book about UNIX programming.
The getrlimit(2) manpage says about "datasize": ``The maximum
size of the data segment for a process; this defines how far a
program may extend its break with the sbrk(2) system call.''
Admittedly, this explanation is not very useful by itself.
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
(Terry Pratchett)
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