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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note *//* * Compatibility interface for userspace libc header coordination: * * Define compatibility macros that are used to control the inclusion or * exclusion of UAPI structures and definitions in coordination with another * userspace C library. * * This header is intended to solve the problem of UAPI definitions that * conflict with userspace definitions. If a UAPI header has such conflicting * definitions then the solution is as follows: * * * Synchronize the UAPI header and the libc headers so either one can be * used and such that the ABI is preserved. If this is not possible then * no simple compatibility interface exists (you need to write translating * wrappers and rename things) and you can't use this interface. * * Then follow this process: * * (a) Include libc-compat.h in the UAPI header. * e.g. #include <linux/libc-compat.h> * This include must be as early as possible. * * (b) In libc-compat.h add enough code to detect that the comflicting * userspace libc header has been included first. * * (c) If the userspace libc header has been included first define a set of * guard macros of the form __UAPI_DEF_FOO and set their values to 1, else * set their values to 0. * * (d) Back in the UAPI header with the conflicting definitions, guard the * definitions with: * #if __UAPI_DEF_FOO * ... * #endif * * This fixes the situation where the linux headers are included *after* the * libc headers. To fix the problem with the inclusion in the other order the * userspace libc headers must be fixed like this: * * * For all definitions that conflict with kernel definitions wrap those * defines in the following: * #if !__UAPI_DEF_FOO * ... * #endif * * This prevents the redefinition of a construct already defined by the kernel. */#ifndef _UAPI_LIBC_COMPAT_H#define _UAPI_LIBC_COMPAT_H
/* We have included glibc headers... */#if defined(__GLIBC__)
/* Coordinate with glibc net/if.h header. */#if defined(_NET_IF_H) && defined(__USE_MISC)
/* GLIBC headers included first so don't define anything * that would already be defined. */
#define __UAPI_DEF_IF_IFCONF 0#define __UAPI_DEF_IF_IFMAP 0#define __UAPI_DEF_IF_IFNAMSIZ 0#define __UAPI_DEF_IF_IFREQ 0/* Everything up to IFF_DYNAMIC, matches net/if.h until glibc 2.23 */#define __UAPI_DEF_IF_NET_DEVICE_FLAGS 0/* For the future if glibc adds IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */#ifndef __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1#endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO */
#else /* _NET_IF_H */
/* Linux headers included first, and we must define everything * we need. The expectation is that glibc will check the * __UAPI_DEF_* defines and adjust appropriately. */
#define __UAPI_DEF_IF_IFCONF 1#define __UAPI_DEF_IF_IFMAP 1#define __UAPI_DEF_IF_IFNAMSIZ 1#define __UAPI_DEF_IF_IFREQ 1/* Everything up to IFF_DYNAMIC, matches net/if.h until glibc 2.23 */#define __UAPI_DEF_IF_NET_DEVICE_FLAGS 1/* For the future if glibc adds IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1
#endif /* _NET_IF_H */
/* Coordinate with glibc netinet/in.h header. */#if defined(_NETINET_IN_H)
/* GLIBC headers included first so don't define anything * that would already be defined. */#define __UAPI_DEF_IN_ADDR 0#define __UAPI_DEF_IN_IPPROTO 0#define __UAPI_DEF_IN_PKTINFO 0#define __UAPI_DEF_IP_MREQ 0#define __UAPI_DEF_SOCKADDR_IN 0#define __UAPI_DEF_IN_CLASS 0
#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#define __UAPI_DEF_IPV6_OPTIONS 0#define __UAPI_DEF_IN6_PKTINFO 0#define __UAPI_DEF_IP6_MTUINFO 0
#else
/* Linux headers included first, and we must define everything * we need. The expectation is that glibc will check the * __UAPI_DEF_* defines and adjust appropriately. */#define __UAPI_DEF_IN_ADDR 1#define __UAPI_DEF_IN_IPPROTO 1#define __UAPI_DEF_IN_PKTINFO 1#define __UAPI_DEF_IP_MREQ 1#define __UAPI_DEF_SOCKADDR_IN 1#define __UAPI_DEF_IN_CLASS 1
#define __UAPI_DEF_IN6_ADDR 1/* We unconditionally define the in6_addr macros and glibc must * coordinate. */#define __UAPI_DEF_IN6_ADDR_ALT 1#define __UAPI_DEF_SOCKADDR_IN6 1#define __UAPI_DEF_IPV6_MREQ 1#define __UAPI_DEF_IPPROTO_V6 1#define __UAPI_DEF_IPV6_OPTIONS 1#define __UAPI_DEF_IN6_PKTINFO 1#define __UAPI_DEF_IP6_MTUINFO 1
#endif /* _NETINET_IN_H */
/* Definitions for xattr.h */#if defined(_SYS_XATTR_H)#define __UAPI_DEF_XATTR 0#else#define __UAPI_DEF_XATTR 1#endif
/* 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. Check for previous __UAPI_* definitions to give * unsupported C libraries a way to opt out of any kernel definition. */#else /* !defined(__GLIBC__) */
/* Definitions for if.h */#ifndef __UAPI_DEF_IF_IFCONF#define __UAPI_DEF_IF_IFCONF 1#endif#ifndef __UAPI_DEF_IF_IFMAP#define __UAPI_DEF_IF_IFMAP 1#endif#ifndef __UAPI_DEF_IF_IFNAMSIZ#define __UAPI_DEF_IF_IFNAMSIZ 1#endif#ifndef __UAPI_DEF_IF_IFREQ#define __UAPI_DEF_IF_IFREQ 1#endif/* Everything up to IFF_DYNAMIC, matches net/if.h until glibc 2.23 */#ifndef __UAPI_DEF_IF_NET_DEVICE_FLAGS#define __UAPI_DEF_IF_NET_DEVICE_FLAGS 1#endif/* For the future if glibc adds IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */#ifndef __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1#endif
/* Definitions for in.h */#ifndef __UAPI_DEF_IN_ADDR#define __UAPI_DEF_IN_ADDR 1#endif#ifndef __UAPI_DEF_IN_IPPROTO#define __UAPI_DEF_IN_IPPROTO 1#endif#ifndef __UAPI_DEF_IN_PKTINFO#define __UAPI_DEF_IN_PKTINFO 1#endif#ifndef __UAPI_DEF_IP_MREQ#define __UAPI_DEF_IP_MREQ 1#endif#ifndef __UAPI_DEF_SOCKADDR_IN#define __UAPI_DEF_SOCKADDR_IN 1#endif#ifndef __UAPI_DEF_IN_CLASS#define __UAPI_DEF_IN_CLASS 1#endif
/* Definitions for in6.h */#ifndef __UAPI_DEF_IN6_ADDR#define __UAPI_DEF_IN6_ADDR 1#endif#ifndef __UAPI_DEF_IN6_ADDR_ALT#define __UAPI_DEF_IN6_ADDR_ALT 1#endif#ifndef __UAPI_DEF_SOCKADDR_IN6#define __UAPI_DEF_SOCKADDR_IN6 1#endif#ifndef __UAPI_DEF_IPV6_MREQ#define __UAPI_DEF_IPV6_MREQ 1#endif#ifndef __UAPI_DEF_IPPROTO_V6#define __UAPI_DEF_IPPROTO_V6 1#endif#ifndef __UAPI_DEF_IPV6_OPTIONS#define __UAPI_DEF_IPV6_OPTIONS 1#endif#ifndef __UAPI_DEF_IN6_PKTINFO#define __UAPI_DEF_IN6_PKTINFO 1#endif#ifndef __UAPI_DEF_IP6_MTUINFO#define __UAPI_DEF_IP6_MTUINFO 1#endif
/* Definitions for xattr.h */#ifndef __UAPI_DEF_XATTR#define __UAPI_DEF_XATTR 1#endif
#endif /* __GLIBC__ */
#endif /* _UAPI_LIBC_COMPAT_H */