Checking sysctl values from within the kernel.
jhb at FreeBSD.org
Fri Aug 5 15:54:30 GMT 2005
On Friday 05 August 2005 10:50 am, Dan Nelson wrote:
> In the last episode (Aug 05), Thordur I. Bjornsson said:
> > If I want to check a sysctl value from within the kernel (e.g. an
> > KLD), should I use the system calls described in sysctl(3) ?
> > If not, what is the propper way to do so ?
> Since most sysctls are direct mappings onto integer variables in the
> kernel, just check the variable directly.
There's also a kernel_sysctl() function available in the kernel for in-kernel
access to sysctls. You might have to lookup the OID for a given name
yourself though. Actually, there's a kernel_sysctlbyname() as well.
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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