Re: Quick Syscall question

[Neil Horman]

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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