Date: Wed, 15 Oct 2008 16:17:30 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-hackers@FreeBSD.ORG, m.jakeman@lancaster.ac.uk Subject: Re: Call function on sysctl value change Message-ID: <200810151417.m9FEHUEn037917@lurza.secnetix.de> In-Reply-To: <200810151343.28136.m.jakeman@lancaster.ac.uk>
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Matthew Jakeman wrote: > I was wondering if it is possible to call a function when a sysctl value is > changed. I have added a few sysctl int variables to the kernel and for some > of these i only want certain values to be acceptable as input depending on > some conditions. I would like to be able to call a function if possible, to > validate the value entered via the sysctl command. Yes, you can do this with a "PROC" type sysctl. For example, look at sysctl_hlt_cpus() in sys/i386/i386/mp_machdep.c. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "Whatever happened to the days when hacking started at the cerebral cortex, and not at the keyboard?" -- Sid on userfriendly.org by Illiad, 2007-06-20
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