Date: Tue, 30 Nov 1999 10:18:17 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: chris@calldei.com, Bill Fumerola <billf@chc-chimes.com>, "Jordan K. Hubbard" <jkh@zippy.cdrom.com>, Dan Moschuk <dan@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/i386/conf files.i386 src/sys/kern kern_fork.c src/sys/libkern arc4random.c src/sys/sys libkern.h Message-ID: <99Nov30.101104est.40338@border.alcanet.com.au> In-Reply-To: <23833.943913718@critter.freebsd.dk> References: <19991129160908.J2233@holly.calldei.com> <23833.943913718@critter.freebsd.dk>
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On 1999-Nov-30 09:15:18 +1100, Poul-Henning Kamp wrote:
> SYSCTL_STRING(_kern, KERN_NISDOMAINNAME, domainname, CTLFLAG_RW,
> &domainname, sizeof(domainname), "Name of the current YP/NIS domain");
>
>The string in the last argument gets put in a "non-load" ELF section
>in the kernel.
This much is trivial.
>It is not particular hard to do this. You need to figure out some
>way to tell GCC to stick this string in the special section,
>but otherwise it should be a pretty simple job (do I see any
>hands ?)
__attribute__((section(".sysctl_descriptions")))
>priority 2:
> Make it possible to extract the strings sysctl -d
I have been looking at this. What I want to do is expand
struct sysctl_oid to include a `pointer' to the (non-resident)
sysctl description (and a pointer to the loaded filename to
support sysctl's in KLDs). A new "staff-function" (eg
sysctl({0,6,...},...)) would return the description "pointer"
and the filename.
Given the filename and description "pointer", the userland
can then find the actual description. I believe it should
be possible to make the "pointer" be the offset within the
file (which saves the userland having to convert it into one).
I've come across two stumbling blocks so far:
1) Making the linker generate a non-loaded section that can
be referenced from a loaded section without expanding the
ELF header.
2) Convincing the linker to use an address which translates
directly (or trivially) to the file offset.
I'd also like to see the sysctl descriptions become more
descriptive, but that can wait until we can display them.
Peter
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