267 lines
8.0 KiB
C
267 lines
8.0 KiB
C
/*
|
|
* 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 */
|
|
|
|
/* Coordinate with glibc netipx/ipx.h header. */
|
|
#if defined(__NETIPX_IPX_H)
|
|
|
|
#define __UAPI_DEF_SOCKADDR_IPX 0
|
|
#define __UAPI_DEF_IPX_ROUTE_DEFINITION 0
|
|
#define __UAPI_DEF_IPX_INTERFACE_DEFINITION 0
|
|
#define __UAPI_DEF_IPX_CONFIG_DATA 0
|
|
#define __UAPI_DEF_IPX_ROUTE_DEF 0
|
|
|
|
#else /* defined(__NETIPX_IPX_H) */
|
|
|
|
#define __UAPI_DEF_SOCKADDR_IPX 1
|
|
#define __UAPI_DEF_IPX_ROUTE_DEFINITION 1
|
|
#define __UAPI_DEF_IPX_INTERFACE_DEFINITION 1
|
|
#define __UAPI_DEF_IPX_CONFIG_DATA 1
|
|
#define __UAPI_DEF_IPX_ROUTE_DEF 1
|
|
|
|
#endif /* defined(__NETIPX_IPX_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 ipx.h */
|
|
#ifndef __UAPI_DEF_SOCKADDR_IPX
|
|
#define __UAPI_DEF_SOCKADDR_IPX 1
|
|
#endif
|
|
#ifndef __UAPI_DEF_IPX_ROUTE_DEFINITION
|
|
#define __UAPI_DEF_IPX_ROUTE_DEFINITION 1
|
|
#endif
|
|
#ifndef __UAPI_DEF_IPX_INTERFACE_DEFINITION
|
|
#define __UAPI_DEF_IPX_INTERFACE_DEFINITION 1
|
|
#endif
|
|
#ifndef __UAPI_DEF_IPX_CONFIG_DATA
|
|
#define __UAPI_DEF_IPX_CONFIG_DATA 1
|
|
#endif
|
|
#ifndef __UAPI_DEF_IPX_ROUTE_DEF
|
|
#define __UAPI_DEF_IPX_ROUTE_DEF 1
|
|
#endif
|
|
|
|
/* Definitions for xattr.h */
|
|
#ifndef __UAPI_DEF_XATTR
|
|
#define __UAPI_DEF_XATTR 1
|
|
#endif
|
|
|
|
#endif /* __GLIBC__ */
|
|
|
|
#endif /* _UAPI_LIBC_COMPAT_H */
|