From owner-freebsd-hackers  Wed Aug  5 17:59:15 1998
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From: Jacques Vidrine <n@nectar.com>
In-reply-to: <199808052241.AAA05242@surf.IAE.nl> 
References: <199808052241.AAA05242@surf.IAE.nl>
Subject: Re: Adding system calls 
To: wjw@IAEhv.nl
cc: hackers@FreeBSD.ORG
Date: Wed, 05 Aug 1998 19:58:08 -0500
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On 6 August 1998 at 0:41, Willem Jan Withagen <wjw@surf.IAE.nl> wrote:
> 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.

If you want a new object in the MIB, see sys/sys/sysctl.h.

If you actually want a new system call: 

1. Edit $src/sys/kern/syscalls.master.
2. Run ``shmakesyscalls.sh syscalls.master'' or ``make ../sys/sysproto.h''
   in sys/kern.

To take care of libc:
3. cd $src/include && make install
4. cd $src/lib/libc && make obj depend && make all install

I think that's it.

Someone with more experience should answer the important 
questions below.

> 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

Jacques Vidrine / n@nectar.com / jvidrine@verio.net / nectar@FreeBSD.org


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