Date: Sat, 29 Dec 2007 00:31:04 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-arch@freebsd.org Subject: Re: kernel features MIB Message-ID: <20071229002903.M45653@fledge.watson.org> In-Reply-To: <200712281745.08144.jhb@freebsd.org> References: <200712271704.44796.jhb@FreeBSD.org> <200712281745.08144.jhb@freebsd.org>
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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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