kernel features MIB
Robert Watson
rwatson at FreeBSD.org
Fri Dec 28 16:31:05 PST 2007
On Fri, 28 Dec 2007, John Baldwin wrote:
> On Thursday 27 December 2007 05:04:44 pm John Baldwin wrote:
>
>> At work we don't have a pretty API for this at all, but I'm thinking for
>> FreeBSD we can do this:
>>
>> FEATURE(foo, "description of foo")
>>
>> which is a macro to create the 'kern.features.foo' node and set it to 1.
>> Then we could have a routine in libc:
>>
>> int feature_present(const char *name);
>>
>> That returns a boolean to indicate if a given feature is present or not by
>> invoking sysctlbyname(3), etc.
>>
>> Any objections to the idea?
>
> So here's a bikeshed question I have no idea for. Which header should
> feature_present()'s prototype go in? I anticipate this routine being used
> in libc itself, so I don't think it can go into libutil.
#include <sys/feature.h>
feature_check(2)?
Does POSIX talk about the namespace for non-portable names being passed to
sysconf(3)?
Robert N M Watson
Computer Laboratory
University of Cambridge
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