linux-kernel - [PATCH 3/4] libc-compat.h: fix some issues arising from in6.h

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Date:	Fri, 14 Mar 2014 17:15:49 +0100
From:	David Heidelberger <david.heidelberger@...t.cz>
To:	linux-kernel@...r.kernel.org
Cc:	maillist-linux@...fooze.de
Subject: [PATCH 3/4] libc-compat.h: fix some issues arising from in6.h

namely redefinition of some structs provided by netinet/in.h.

Signed-off-by: John Spencer <maillist-linux@...fooze.de>
Tested-by: David Heidelberger <david.heidelberger@...t.cz>
---
  include/uapi/linux/libc-compat.h | 25 ++++++++-----------------
  1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/include/uapi/linux/libc-compat.h 
b/include/uapi/linux/libc-compat.h
index 335e8a7..c16c34c 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -48,35 +48,26 @@
  #ifndef _UAPI_LIBC_COMPAT_H
  #define _UAPI_LIBC_COMPAT_H

-/* We have included glibc headers... */
-#if defined(__GLIBC__)
+#ifndef __KERNEL__ /* we're used from userspace */

-/* Coordinate with glibc netinet/in.h header. */
-#if defined(_NETINET_IN_H)
+/* Coordinate with libc netinet/in.h header. */
+#ifdef _NETINET_IN_H

  /* GLIBC headers included first so don't define anything
   * that would already be defined. */
  #define __UAPI_DEF_IN6_ADDR		0
-/* The exception is the in6_addr macros which must be defined
- * if the glibc code didn't define them. This guard matches
- * the guard in glibc/inet/netinet/in.h which defines the
- * additional in6_addr macros e.g. s6_addr16, and s6_addr32. */
-#if defined(__USE_MISC) || defined (__USE_GNU)
  #define __UAPI_DEF_IN6_ADDR_ALT		0
-#else
-#define __UAPI_DEF_IN6_ADDR_ALT		1
-#endif
  #define __UAPI_DEF_SOCKADDR_IN6		0
  #define __UAPI_DEF_IPV6_MREQ		0
  #define __UAPI_DEF_IPPROTO_V6		0

-#else
+#else /* defined(_NETINET_IN_H) */

  /* Linux headers included first, and we must define everything
- * we need. The expectation is that glibc will check the
+ * we need. The expectation is that the libc will check the
   * __UAPI_DEF_* defines and adjust appropriately. */
  #define __UAPI_DEF_IN6_ADDR		1
-/* We unconditionally define the in6_addr macros and glibc must
+/* We unconditionally define the in6_addr macros and the libc must
   * coordinate. */
  #define __UAPI_DEF_IN6_ADDR_ALT		1
  #define __UAPI_DEF_SOCKADDR_IN6		1
@@ -89,7 +80,7 @@
  /* If we did not see any headers from any supported C libraries,
   * or we are being included in the kernel, then define everything
   * that we need. */
-#else /* !defined(__GLIBC__) */
+#else /* __KERNEL__ */

  /* Definitions for in6.h */
  #define __UAPI_DEF_IN6_ADDR		1
@@ -98,6 +89,6 @@
  #define __UAPI_DEF_IPV6_MREQ		1
  #define __UAPI_DEF_IPPROTO_V6		1

-#endif /* __GLIBC__ */
+#endif /* __KERNEL__ */

  #endif /* _UAPI_LIBC_COMPAT_H */
-- 
1.8.4

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