linux-kernel - [PATCH 4/4] libc-compat.h: prevent redefinition of struct ethhdr

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Date:	Fri, 14 Mar 2014 17:16:29 +0100
From:	David Heidelberger <david.heidelberger@...t.cz>
To:	linux-kernel@...r.kernel.org
Cc:	maillist-linux@...fooze.de
Subject: [PATCH 4/4] libc-compat.h: prevent redefinition of struct ethhdr


Signed-off-by: John Spencer <maillist-linux@...fooze.de>
Tested-by: David Heidelberger <david.heidelberger@...t.cz>
---
  include/uapi/linux/if_ether.h    | 4 +++-
  include/uapi/linux/libc-compat.h | 6 ++++++
  2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_ether.h 
b/include/uapi/linux/if_ether.h
index 2ce0f6a..18cfb23 100644
--- a/include/uapi/linux/if_ether.h
+++ b/include/uapi/linux/if_ether.h
@@ -22,6 +22,7 @@
  #define _UAPI_LINUX_IF_ETHER_H

  #include <linux/types.h>
+#include <linux/libc-compat.h>

  /*
   *	IEEE 802.3 Ethernet magic constants.  The frame sizes omit the 
preamble
@@ -131,11 +132,12 @@
   *	This is an Ethernet frame header.
   */

+#if __UAPI_DEF_ETHHDR
  struct ethhdr {
  	unsigned char	h_dest[ETH_ALEN];	/* destination eth addr	*/
  	unsigned char	h_source[ETH_ALEN];	/* source ether addr	*/
  	__be16		h_proto;		/* packet type ID field	*/
  } __attribute__((packed));
-
+#endif

  #endif /* _UAPI_LINUX_IF_ETHER_H */
diff --git a/include/uapi/linux/libc-compat.h 
b/include/uapi/linux/libc-compat.h
index c16c34c..c491d7a 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -50,6 +50,12 @@

  #ifndef __KERNEL__ /* we're used from userspace */

+#ifdef _NETINET_IF_ETHER_H /* musl */
+#define __UAPI_DEF_ETHHDR 0
+#else /* glibc uses __NETINET_IF_ETHER_H, and includes the kernel 
header. */
+#define __UAPI_DEF_ETHHDR 1
+#endif
+
  /* Coordinate with libc netinet/in.h header. */
  #ifdef _NETINET_IN_H

-- 
1.8.4
--
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