/usr/include/linux/libc-compat.h is in linux-libc-dev 4.15.0-20.21.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 | /* 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 _LIBC_COMPAT_H
#define _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 /* _LIBC_COMPAT_H */
|