[PATCH] 2.6.3 very small patch: libc compatibility for skbuff.h (userspace access to sk_buffs)

[wdebruij@dds.nl]

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hi, 

  for a network monitoring application I needed access to sk_buff's from
userspace. The current linux/skbuff.h headerfile cannot be included from
userspace applications due to various kernel .h vs. libc .h clashes. 

I basically pruned the #include statements by inserting #ifdef _KERNEL__
statements until gcc started complaining. Therefore nothing has changed in the
kernelspace implementation. But this minor change makes it possible to include
linux/skbuff.h from userspace. 

Ideally, all the #ifdef __KERNEL__ secured headerfile references should be
removed, since it is clear that skbuff.h doesn't really rely on them. Perhaps
some .c file does, but I didn't feel like finding out which one.

cheers,

  Willem


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--- linux-2.6.3-orig/include/linux/skbuff.h	2004-02-18 04:58:26.000000000 +0100
+++ linux-2.6.3/include/linux/skbuff.h	2004-03-04 09:36:55.827316800 +0100
@@ -14,19 +14,28 @@
 #ifndef _LINUX_SKBUFF_H
 #define _LINUX_SKBUFF_H
 
+#ifdef __KERNEL__
 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/compiler.h>
+#endif
+
 #include <linux/time.h>
-#include <linux/cache.h>
 
+#ifdef __KERNEL__
+#include <linux/cache.h>
 #include <asm/atomic.h>
 #include <asm/types.h>
+#endif
+
 #include <linux/spinlock.h>
+
+#ifdef __KERNEL__
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/poll.h>
 #include <linux/net.h>
+#endif
 
 #define HAVE_ALLOC_SKB		/* For the drivers to know */
 #define HAVE_ALIGNABLE_SKB	/* Ditto 8)		   */