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

Signed-off-by: John Spencer <maillist-linux@barfooze.de>
Tested-by: David Heidelberger <david.heidelberger@ixit.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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