Message-ID: <413B9060.9060500@redhat.com>
Date: Sun, 05 Sep 2004 18:17:04 -0400
From: Neil Horman <nhorman@redhat.com>
Reply-To: nhorman@redhat.com
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To: "Randy.Dunlap" <rddunlap@osdl.org>
CC: eric@cisu.net, linux-kernel@vger.kernel.org
Subject: Re: Quick Syscall question
References: <200409051317.42691.eric@cisu.net> <20040905113114.313efdf2.rddunlap@osdl.org>
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Randy.Dunlap wrote:

>On Sun, 5 Sep 2004 13:17:42 -0500 Eric Bambach wrote:
>
>| Hello,
>| 
>| 	This may seem like a silly question, however we were all beginning 
>| programmers once ;)
>| 
>| 	I want to do some manipulating of network interfaces and routing and such. I 
>| am reading through some of the linux net sources but am confused on what are 
>| internal, kernel-only functions and what are externally visable syscalls. How 
>| can I tell from the source what is user-space visable that I can hook into 
>| and what is intternel stuff? Should I just be looking at headers or do I have 
>| to delve into the .c sources? I can do either, I just need a pointer on where 
>| to start and what I should be looking for.
>
>Most syscalls are listed in include/linux/syscalls.h.
>Also look in include/asm-*/unistd.h.
>Also in entry.S in arch/*/ (various sub-directory levels).
>
>--
>~Randy
>-
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>
Also, if you're looking into writing kernel modules, anything listed in 
arch/*ksyms.c as a symbol inside an EXPORT_SYMBOL block is accessible, 
although that may not mean its available from user space.
Neil

-- 
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 *Neil Horman
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 *Red Hat, Inc.
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