header file related question

[Andreas Kohn]

On Fri, 2004-09-10 at 02:38, vxp wrote:
> hi,
> 
> i realize it's most likely a stupid question, but try not to be too hard
> on me please - i'm trying to learn :)
> 
> i'm experimenting with the kernel's source, and i'm not quite sure how to
> find what all the header files are that i need, for the stuff i'd like to
> do.. how do i track down what header files i need to #include in my stuff?
> 
> for instance, i'm trying to modify icmp_input() (found in
> /sys/netinet/ip_icmp.c) and load the new function via a kernel module.
> 
> so, i copied all the #include's from /sys/netinet/ip_icmp.c and only have
> the icmp_input() function (unmodified right now, from the form i found
> it), the header files from the original ip_icmp, and a main() that
> simply returns 0. doesn't want to compile, with errors about header files
> such as:
> ---------------
> In file included from icmp.c:37:
> /usr/include/netinet/in_var.h:50: error: field `ia_ifa' has incomplete
> type
> In file included from /usr/include/netinet/in_var.h:238,
>                  from icmp.c:37:
> /usr/include/netinet6/in6_var.h:103: error: field `ia_ifa' has incomplete
> type
> ---------------
> i realize that it's most likely because i didn't #include something else i
> need..  but how come /sys/netinet/ip_icmp.c compiles, then?  because this
> file is basically that, with all functions but icmp_input removed, and a
> main() that does nothing..
> 
> so.. sorry for the long post.
> but please tell me how do i find out what header files i need ? :)
> 
> thanks.
> 

Hi,

just guessing: Did you compile with -D_KERNEL?

HTH,
Andreas
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