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xattr: guard against simultaneous glibc header inclusion

If the glibc xattr.h header is included after the uapi header, compilation fails due to an enum re-using a #define from the uapi header. Protect against this by guarding the define and enum inclusions against each other. (See https://lists.debian.org/debian-glibc/2014/03/msg00029.html and https://sourceware.org/glibc/wiki/Synchronizing_Headers for more information.)

Serge Hallyn committed 12 years ago

Commit ea1a8211 parent e9107f82 files · +16 −0Browse files

Showing the changes to include/uapi/linux (2 of 2 files). Show all

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2 files
  1. include/uapi/linux/libc-compat.h +9 −0
  2. include/uapi/linux/xattr.h +7 −0
include/uapi/linux/libc-compat.h+9−0
@@ -85,6 +85,12 @@ · 84 unmodified lines
85 85
86#endif /* _NETINET_IN_H */86#endif /* _NETINET_IN_H */
87 87
88/* Definitions for xattr.h */
89#if defined(_SYS_XATTR_H)
90#define __UAPI_DEF_XATTR 0
91#else
92#define __UAPI_DEF_XATTR 1
93#endif
88 94
89/* If we did not see any headers from any supported C libraries,95/* If we did not see any headers from any supported C libraries,
90 * or we are being included in the kernel, then define everything96 * or we are being included in the kernel, then define everything
@@ -98,6 +104,9 @@ · 7 unmodified lines
98#define __UAPI_DEF_IPV6_MREQ 1104#define __UAPI_DEF_IPV6_MREQ 1
99#define __UAPI_DEF_IPPROTO_V6 1105#define __UAPI_DEF_IPPROTO_V6 1
100 106
107/* Definitions for xattr.h */
108#define __UAPI_DEF_XATTR 1
109
101#endif /* __GLIBC__ */110#endif /* __GLIBC__ */
102 111
103#endif /* _UAPI_LIBC_COMPAT_H */112#endif /* _UAPI_LIBC_COMPAT_H */
include/uapi/linux/xattr.h+7−0
@@ -7,11 +7,18 @@ · 6 unmodified lines
7 Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.7 Copyright (c) 2001-2002 Silicon Graphics, Inc. All Rights Reserved.
8 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>8 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
9*/9*/
10
11#include <linux/libc-compat.h>
12
10#ifndef _UAPI_LINUX_XATTR_H13#ifndef _UAPI_LINUX_XATTR_H
11#define _UAPI_LINUX_XATTR_H14#define _UAPI_LINUX_XATTR_H
12 15
16#ifdef __UAPI_DEF_XATTR
17#define __USE_KERNEL_XATTR_DEFS
18
13#define XATTR_CREATE 0x1 /* set value, fail if attr already exists */19#define XATTR_CREATE 0x1 /* set value, fail if attr already exists */
14#define XATTR_REPLACE 0x2 /* set value, fail if attr does not exist */20#define XATTR_REPLACE 0x2 /* set value, fail if attr does not exist */
21#endif
15 22
16/* Namespaces */23/* Namespaces */
17#define XATTR_OS2_PREFIX "os2."24#define XATTR_OS2_PREFIX "os2."