Subject: Re: Difference display sysctl
To: kamel derouiche <>
From: Pavel Cahyna <>
List: tech-userlevel
Date: 02/17/2005 10:14:42
On Wed, 16 Feb 2005 21:18:33 +0100, kamel derouiche wrote:

>>If you are asking about the different sysctl's
>> between different operating
>> systems, this is a very broad question and too many
>> to cover easily. 
> oui, 
> Comme je travail seulement sur NetBSD/i386. je n'est
> aucun idée  sur l'implentation et la sortie de
> sysctl(8) sur d'autre système:Linux,FreeBSD,
> IRIX,etc...
> je voudrais savoir est ce que sysctl(3) et sysctl.h
> diffère selon les architectures 

sysctl is a feature of 4.4BSD. On systems derived from
it, such as FreeBSD, NetBSD, OpenBSD and Darwin/Mac OS X, the
implementation will be similar I guess, only the API for converting names
(MIBs) such as "kern.mbuf.nmbclusters" to numbers (OIDs) such as 1.39.3
is absent from OpenBSD.

On Linux, sysctl is implemented with a special subdirectory (/proc/sys)
inside the /proc file system. Every sysctl node corresponds to a file in
this filesystem. Numbers are formatted as text. There is no sysctl(3)
function - the sysctl(8) utility simply reads the filesystem.

On IRIX, there is a sysctl(3) function like that on 4.4BSD, but it offers
only a very limited number of MIBs.

BTW, there are nice online manual pages at and SGI also has online man pages at

Bye	Pavel