From owner-freebsd-hackers  Wed Aug  5 15:42:00 1998
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From: Willem Jan  Withagen <wjw@surf.IAE.nl>
Message-Id: <199808052241.AAA05242@surf.IAE.nl>
Subject: Adding system calls
To: hackers@FreeBSD.ORG
Date: Thu, 6 Aug 1998 00:41:37 +0200 (MET DST)
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Hi,

This must be a FAQ, but I can not find it. :-(

What/were is the receipe to add new system calls.
I'd like to add my own sysctl_* calls.

Are there any directives on what "design" to use while defining these calls.
Like:
   -	Use only one syscall as a multiplexer
	(Which created a not so trivial mess is the current sysctl)
   -	What parameters are a bad idea to transfer from
	user to kernel space?

And answers to questions like:
   -	Where can I find the "user"-data
   -	Hoe to I return results for "call-by-ref" parameters

Sounds like there should be at least some info on this.

--WjW

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