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Origin: https://github.com/sabotage-linux/kernel-headers/blob/master/generic/include/linux/libc-compat.hstable/0.6
Christian Wiese
11 years ago
1 changed files with 135 additions and 0 deletions
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# --- SDE-COPYRIGHT-NOTE-BEGIN ---
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# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
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#
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# Filename: package/.../musl/pkg/linux-header/libc-compat.patch
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# Copyright (C) 2014 The OpenSDE Project
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#
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# More information can be found in the files COPYING and README.
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#
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# This patch file is dual-licensed. It is available under the license the
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# patched project is licensed under, as long as it is an OpenSource license
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# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
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# of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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# --- SDE-COPYRIGHT-NOTE-END ---
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Add <linux/libc-compat.h> a compatibility interface for userspace libc header
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coordination.
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Origin: kernel-headers provided by sabotage-linux
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https://github.com/sabotage-linux/kernel-headers/blob/master/generic/include/linux/libc-compat.h
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--- /dev/null
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+++ b/include/uapi/linux/libc-compat.h
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@@ -0,0 +1,100 @@
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+/*
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+ * Compatibility interface for userspace libc header coordination:
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+ *
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+ * Define compatibility macros that are used to control the inclusion or
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+ * exclusion of UAPI structures and definitions in coordination with another
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+ * userspace C library.
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+ *
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+ * This header is intended to solve the problem of UAPI definitions that
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+ * conflict with userspace definitions. If a UAPI header has such conflicting
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+ * definitions then the solution is as follows:
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+ *
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+ * * Synchronize the UAPI header and the libc headers so either one can be
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+ * used and such that the ABI is preserved. If this is not possible then
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+ * no simple compatibility interface exists (you need to write translating
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+ * wrappers and rename things) and you can't use this interface.
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+ *
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+ * Then follow this process:
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+ *
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+ * (a) Include libc-compat.h in the UAPI header.
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+ * e.g. #include <linux/libc-compat.h>
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+ * This include must be as early as possible.
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+ *
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+ * (b) In libc-compat.h add enough code to detect that the comflicting
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+ * userspace libc header has been included first.
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+ *
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+ * (c) If the userspace libc header has been included first define a set of
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+ * guard macros of the form __UAPI_DEF_FOO and set their values to 1, else
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+ * set their values to 0.
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+ *
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+ * (d) Back in the UAPI header with the conflicting definitions, guard the
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+ * definitions with:
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+ * #if __UAPI_DEF_FOO
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+ * ...
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+ * #endif
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+ *
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+ * This fixes the situation where the linux headers are included *after* the
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+ * libc headers. To fix the problem with the inclusion in the other order the
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+ * userspace libc headers must be fixed like this:
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+ *
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+ * * For all definitions that conflict with kernel definitions wrap those
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+ * defines in the following:
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+ * #if !__UAPI_DEF_FOO
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+ * ...
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+ * #endif
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+ *
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+ * This prevents the redefinition of a construct already defined by the kernel.
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+ */
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+#ifndef _LIBC_COMPAT_H
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+#define _LIBC_COMPAT_H
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+
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+#ifndef __KERNEL__ /* we're used from userspace */
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+
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+#ifdef _NETINET_IF_ETHER_H /* musl */
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+#define __UAPI_DEF_ETHHDR 0
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+#else /* glibc uses __NETINET_IF_ETHER_H, and includes the kernel header. */
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+#define __UAPI_DEF_ETHHDR 1
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+#endif
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+
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+/* Coordinate with libc netinet/in.h header. */
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+#if defined(_NETINET_IN_H)
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+
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+/* GLIBC headers included first so don't define anything
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+ * that would already be defined. */
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+#define __UAPI_DEF_IN6_ADDR 0
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+#define __UAPI_DEF_IN6_ADDR_ALT 0
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+#define __UAPI_DEF_SOCKADDR_IN6 0
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+#define __UAPI_DEF_IPV6_MREQ 0
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+#define __UAPI_DEF_IPPROTO_V6 0
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+
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+#else /* defined(_NETINET_IN_H) */
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+
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+/* Linux headers included first, and we must define everything
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+ * we need. The expectation is that the libc will check the
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+ * __UAPI_DEF_* defines and adjust appropriately. */
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+#define __UAPI_DEF_IN6_ADDR 1
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+/* We unconditionally define the in6_addr macros and libc must
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+ * coordinate. */
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+#define __UAPI_DEF_IN6_ADDR_ALT 1
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+#define __UAPI_DEF_SOCKADDR_IN6 1
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+#define __UAPI_DEF_IPV6_MREQ 1
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+#define __UAPI_DEF_IPPROTO_V6 1
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+
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+#endif /* _NETINET_IN_H */
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+
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+
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+/* If we did not see any headers from any supported C libraries,
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+ * or we are being included in the kernel, then define everything
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+ * that we need. */
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+#else /* __KERNEL__ */
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+
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+/* Definitions for in6.h */
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+#define __UAPI_DEF_IN6_ADDR 1
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+#define __UAPI_DEF_IN6_ADDR_ALT 1
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+#define __UAPI_DEF_SOCKADDR_IN6 1
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+#define __UAPI_DEF_IPV6_MREQ 1
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+#define __UAPI_DEF_IPPROTO_V6 1
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+
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+#endif /* __KERNEL__ */
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+
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+#endif /* _LIBC_COMPAT_H */
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--- a/include/uapi/linux/Kbuild
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+++ b/include/uapi/linux/Kbuild
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@@ -422,3 +422,6 @@
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header-y += xattr.h
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header-y += xfrm.h
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header-y += hw_breakpoint.h
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+
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+# install compatibility interface for userspace libc header coordination
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+header-y += libc-compat.h
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