sysdeps/unix/sysv/linux/kernel-features.h

   1 /* Set flags signalling availability of kernel features based on given
   2    kernel version number.
   3    Copyright (C) 1999-2009, 2010, 2011, 2012 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file must not contain any C code.  At least it must be protected
  21    to allow using the file also in assembler files.  */
  22
  23 #ifndef __LINUX_KERNEL_VERSION
  24 /* We assume the worst; all kernels should be supported.  */
  25 # define __LINUX_KERNEL_VERSION 0
  26 #endif
  27
  28 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
  29    linux/version.h.  I.e., the major, minor, and subminor all get a
  30    byte with the major number being in the highest byte.  This means
  31    we can do numeric comparisons.
  32
  33    In the following we will define certain symbols depending on
  34    whether the describes kernel feature is available in the kernel
  35    version given by __LINUX_KERNEL_VERSION.  We are not always exactly
  36    recording the correct versions in which the features were
  37    introduced.  If somebody cares these values can afterwards be
  38    corrected.  */
  39
  40 /* The sendfile syscall was introduced in 2.2.0.  */
  41 #define __ASSUME_SENDFILE               1
  42
  43 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
  44 #ifdef __i386__
  45 # define __ASSUME_MMAP2_SYSCALL 1
  46 #endif
  47
  48 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
  49 #ifdef __i386__
  50 # define __ASSUME_STAT64_SYSCALL        1
  51 #endif
  52
  53 /* On sparc the mmap2/stat64/lstat64/fstat64 syscalls were introduced
  54    in 2.3.35.  */
  55 #if defined __sparc__ && !defined __arch64__
  56 # define __ASSUME_MMAP2_SYSCALL         1
  57 # define __ASSUME_STAT64_SYSCALL        1
  58 #endif
  59
  60 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
  61    support separate 64-bit syscalls, already 64-bit.  */
  62 #if defined __powerpc__ && !defined __powerpc64__
  63 # define __ASSUME_STAT64_SYSCALL        1
  64 #endif
  65
  66 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  Linux 2.4.0 on
  67    PPC introduced a correct IPC64.  But PowerPC64 does not support a
  68    separate 64-bit syscall, already 64-bit.  */
  69 #ifndef __powerpc64__
  70 # define __ASSUME_IPC64         1
  71 #endif
  72
  73 /* SH kernels got stat64 and mmap2 during 2.4.0-test.  */
  74 #ifdef __sh__
  75 # define __ASSUME_MMAP2_SYSCALL         1
  76 # define __ASSUME_STAT64_SYSCALL        1
  77 #endif
  78
  79 /* The changed st_ino field appeared in 2.4.0-test6.  However, SH is lame,
  80    and still does not have a 64-bit inode field.  */
  81 #ifndef __sh__
  82 # define __ASSUME_ST_INO_64_BIT         1
  83 #endif
  84
  85 /* The getdents64 syscall was introduced in 2.4.0-test7 (but later for
  86    MIPS n32).  */
  87 #define __ASSUME_GETDENTS64_SYSCALL     1
  88
  89 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
  90    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
  91 #if defined __powerpc__ && !defined __powerpc64__
  92 # define __ASSUME_MMAP2_SYSCALL         1
  93 #endif
  94
  95 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
  96    their availability with one define.  The changes were made first
  97    for i386 and the have to be done separately for the other archs.
  98    For i386 we pick 2.5.50 as the first version with support.
  99    For s390*, SPARC, PPC, x86-64, and SH we pick 2.5.64 as the first
 100    version with support.  */
 101 #if (defined __i386__ || defined __s390__ || defined __sparc__          \
 102      || defined __powerpc__ || defined __x86_64__ || defined __sh__)
 103 # define __ASSUME_CLONE_THREAD_FLAGS    1
 104 #endif
 105
 106 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
 107    timers based on them is available.  */
 108 #define __ASSUME_POSIX_TIMERS           1
 109
 110 /* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
 111 #define __ASSUME_POSIX_CPU_TIMERS       1
 112
 113 /* The statfs64 syscalls are available in 2.5.74 (but not for alpha).  */
 114 #define __ASSUME_STATFS64       1
 115
 116 /* The tgkill syscall was instroduced for i386 in 2.5.75.  On x86-64,
 117    sparc, SH, ppc, and ppc64 it was introduced in 2.6.0-test3. */
 118 #if (defined __i386__ || defined __x86_64__ || defined __powerpc__      \
 119      || defined __sh__ || defined __sparc__)
 120 # define __ASSUME_TGKILL        1
 121 #endif
 122
 123 /* The utimes syscall has been available for some architectures
 124    forever.  For x86 it was introduced after 2.5.75, for x86-64,
 125    ppc, and ppc64 it was introduced in 2.6.0-test3.  */
 126 #if defined __sparc__ \
 127     || defined __i386__ \
 128     || defined __x86_64__ \
 129     || defined __powerpc__ \
 130     || defined __sh__
 131 # define __ASSUME_UTIMES        1
 132 #endif
 133
 134 /* The fixed version of the posix_fadvise64 syscall appeared in
 135    2.6.0-test3.  At least for x86 and sparc.  Powerpc support appeared
 136    in 2.6.2, but for 32-bit userspace only.  */
 137 #if (defined __i386__ || defined __sparc__                      \
 138      || (defined __powerpc__ && !defined __powerpc64__))
 139 # define __ASSUME_FADVISE64_64_SYSCALL  1
 140 #endif
 141
 142 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
 143    SIMD (AKA Altivec, VMX) instructions and register state.  This changes
 144    the overall size of the sigcontext and adds the swapcontext syscall.  */
 145 #ifdef __powerpc__
 146 # define __ASSUME_SWAPCONTEXT_SYSCALL   1
 147 #endif
 148
 149 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12.  */
 150 #if defined __sparc__ && defined __arch64__
 151 # define __ASSUME_STAT64_SYSCALL        1
 152 #endif
 153
 154 /* pselect/ppoll were introduced just after 2.6.16-rc1.  Due to the way
 155    the kernel versions are advertised we can only rely on 2.6.17 to have
 156    the code.  On x86_64 and SH this appeared first in 2.6.19-rc1,
 157    on ia64 in 2.6.22-rc1.  */
 158 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 159     && ((!defined __x86_64__ && !defined __sh__) \
 160         || (__LINUX_KERNEL_VERSION >= 0x020613 \
 161             && (defined __x86_64__ || defined __sh__)))
 162 # define __ASSUME_PSELECT       1
 163 # define __ASSUME_PPOLL         1
 164 #endif
 165
 166 /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the
 167    kernel versions are advertised we can only rely on 2.6.17 to have
 168    the code.  On PPC they were introduced in 2.6.17-rc1,
 169    on SH in 2.6.19-rc1.  */
 170 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 171     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
 172 # define __ASSUME_ATFCTS        1
 173 #endif
 174
 175 /* Support for inter-process robust mutexes was added in 2.6.17.  */
 176 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 177     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
 178 # define __ASSUME_SET_ROBUST_LIST       1
 179 #endif
 180
 181 /* Pessimistically assume that 2.6.18 introduced real handling of
 182    large numbers of requests to readv and writev and that we don't
 183    need a fallback.  It likely worked for much longer.  */
 184 #if __LINUX_KERNEL_VERSION >= 0x020612
 185 # define __ASSUME_COMPLETE_READV_WRITEV 1
 186 #endif
 187
 188 /* Support for PI futexes was added in 2.6.18.  */
 189 #if __LINUX_KERNEL_VERSION >= 0x020612
 190 # define __ASSUME_FUTEX_LOCK_PI 1
 191 #endif
 192
 193 /* Support for utimensat syscall was added in 2.6.22, on SH
 194    only after 2.6.22-rc1.  */
 195 #if __LINUX_KERNEL_VERSION >= 0x020616 \
 196     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020617)
 197 # define __ASSUME_UTIMENSAT     1
 198 #endif
 199
 200 /* Support for private futexes was added in 2.6.22.  */
 201 #if __LINUX_KERNEL_VERSION >= 0x020616
 202 # define __ASSUME_PRIVATE_FUTEX 1
 203 #endif
 204
 205 /* Support for fallocate was added in 2.6.23, on s390
 206    only after 2.6.23-rc1.  */
 207 #if __LINUX_KERNEL_VERSION >= 0x020617 \
 208     && (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618)
 209 # define __ASSUME_FALLOCATE     1
 210 #endif
 211
 212 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 213    x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23.  */
 214 #if __LINUX_KERNEL_VERSION >= 0x020617 \
 215     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 216         || defined __sparc__ || defined __s390__)
 217 # define __ASSUME_O_CLOEXEC     1
 218 #endif
 219
 220 /* Support for ADJ_OFFSET_SS_READ was added in 2.6.24.  */
 221 #if __LINUX_KERNEL_VERSION >= 0x020618
 222 # define __ASSUME_ADJ_OFFSET_SS_READ    1
 223 #endif
 224
 225 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 226    x86-64, PPC, IA-64, and SPARC in 2.6.27.  */
 227 #if __LINUX_KERNEL_VERSION >= 0x02061b \
 228     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 229         || defined __sparc__ || defined __s390__)
 230 # define __ASSUME_SOCK_CLOEXEC  1
 231 # define __ASSUME_IN_NONBLOCK   1
 232 # define __ASSUME_PIPE2         1
 233 # define __ASSUME_EVENTFD2      1
 234 # define __ASSUME_SIGNALFD4     1
 235 # define __ASSUME_DUP3          1
 236 #endif
 237
 238 /* Support for the accept4 syscall was added in 2.6.28.  */
 239 #if __LINUX_KERNEL_VERSION >= 0x02061c \
 240     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 241         || defined __sparc__ || defined __s390__)
 242 # define __ASSUME_ACCEPT4       1
 243 #endif
 244
 245 /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29.  */
 246 #if __LINUX_KERNEL_VERSION >= 0x02061d
 247 # define __ASSUME_FUTEX_CLOCK_REALTIME  1
 248 #endif
 249
 250 /* Support for the AT_RANDOM auxiliary vector entry was added in 2.6.29.  */
 251 #if __LINUX_KERNEL_VERSION >= 0x02061d
 252 # define __ASSUME_AT_RANDOM     1
 253 #endif
 254
 255 /* Support for preadv and pwritev was added in 2.6.30.  */
 256 #if __LINUX_KERNEL_VERSION >= 0x02061e
 257 # define __ASSUME_PREADV        1
 258 # define __ASSUME_PWRITEV       1
 259 #endif
 260
 261 /* Support for F_GETOWN_EX was introduced in 2.6.32.  */
 262 #if __LINUX_KERNEL_VERSION >= 0x020620
 263 # define __ASSUME_F_GETOWN_EX   1
 264 #endif
 265
 266 /* Support for the recvmmsg syscall was added in 2.6.33.  */
 267 #if __LINUX_KERNEL_VERSION >= 0x020621
 268 # define __ASSUME_RECVMMSG      1
 269 #endif
 270
 271 /* statfs fills in f_flags since 2.6.36.  */
 272 #if __LINUX_KERNEL_VERSION >= 0x020624
 273 # define __ASSUME_STATFS_F_FLAGS        1
 274 #endif
 275
 276 /* prlimit64 is available in 2.6.36.  */
 277 #if __LINUX_KERNEL_VERSION >= 0x020624
 278 # define __ASSUME_PRLIMIT64     1
 279 #endif
 280
 281 /* sendmmsg is available in 2.6.39.  */
 282 #if __LINUX_KERNEL_VERSION >= 0x020627
 283 # define __ASSUME_SENDMMSG      1
 284 #endif
 285
 286 /* getcpu is a syscall for x86-64 since 3.1.  */
 287 #if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
 288 # define __ASSUME_GETCPU_SYSCALL        1
 289 #endif