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 /* When did the `setresuid' syscall became available?  By 2.2.0 except
  41    on SPARC.  */
  42 #if !defined __sparc__
  43 # define __ASSUME_SETRESUID_SYSCALL     1
  44 #endif
  45
  46 /* The sendfile syscall was introduced in 2.2.0.  */
  47 #define __ASSUME_SENDFILE               1
  48
  49 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
  50 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
  51 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  52 #endif
  53
  54 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
  55 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  56 # define __ASSUME_TRUNCATE64_SYSCALL    1
  57 #endif
  58
  59 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
  60 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  61 # define __ASSUME_MMAP2_SYSCALL 1
  62 #endif
  63
  64 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
  65 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
  66 # define __ASSUME_STAT64_SYSCALL        1
  67 #endif
  68
  69 /* On sparc the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
  70    syscalls were introduced in 2.3.35.  */
  71 #if __LINUX_KERNEL_VERSION >= 131875 \
  72     && (defined __sparc__ && !defined __arch64__)
  73 # define __ASSUME_TRUNCATE64_SYSCALL    1
  74 # define __ASSUME_MMAP2_SYSCALL         1
  75 # define __ASSUME_STAT64_SYSCALL        1
  76 #endif
  77
  78 /* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
  79 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
  80 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  81 #endif
  82
  83 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
  84    support separate 64-bit syscalls, already 64-bit.  */
  85 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
  86     && !defined __powerpc64__
  87 # define __ASSUME_TRUNCATE64_SYSCALL    1
  88 # define __ASSUME_STAT64_SYSCALL        1
  89 #endif
  90
  91 /* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
  92    bit type all along.  */
  93 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__
  94 # define __ASSUME_32BITUIDS             1
  95 #endif
  96
  97 /* Linux 2.3.39 sparc added setresuid.  */
  98 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
  99 # define __ASSUME_SETRESUID_SYSCALL     1
 100 #endif
 101
 102 #if __LINUX_KERNEL_VERSION >= 131879
 103 # define __ASSUME_SETRESGID_SYSCALL     1
 104 #endif
 105
 106 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
 107 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
 108 # define __ASSUME_IPC64         1
 109 #endif
 110
 111 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 112 #if __LINUX_KERNEL_VERSION >= 131939
 113 # define __ASSUME_LDT_WORKS             1
 114 #endif
 115
 116 /* Linux 2.4.0 on PPC introduced a correct IPC64.  But PowerPC64 does not
 117    support a separate 64-bit syscall, already 64-bit.  */
 118 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
 119     && !defined __powerpc64__
 120 # define __ASSUME_IPC64                 1
 121 #endif
 122
 123 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test.  */
 124 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
 125 # define __ASSUME_TRUNCATE64_SYSCALL    1
 126 # define __ASSUME_MMAP2_SYSCALL         1
 127 # define __ASSUME_STAT64_SYSCALL        1
 128 #endif
 129
 130 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 131    distinguish this version from other 2.4.0 releases.  Therefore play
 132    save and assume it available is for 2.4.1 and up.  However, SH is lame,
 133    and still does not have a 64-bit inode field.  */
 134 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __sh__
 135 # define __ASSUME_ST_INO_64_BIT         1
 136 #endif
 137
 138 /* To support locking of large files a new fcntl() syscall was introduced
 139    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 140    the syscall is available.  */
 141 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 142 # define __ASSUME_FCNTL64               1
 143 #endif
 144
 145 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
 146    series.  */
 147 #if __LINUX_KERNEL_VERSION >= 132097
 148 # define __ASSUME_AT_CLKTCK             1
 149 #endif
 150
 151 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 152    don't know when it got introduced).  But PowerPC64 does not support
 153    separate FCNTL64 call, FCNTL is already 64-bit */
 154 #if __LINUX_KERNEL_VERSION >= 132100 \
 155     && (defined __powerpc__ || defined __sh__) \
 156     && !defined __powerpc64__
 157 # define __ASSUME_FCNTL64               1
 158 #endif
 159
 160 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 161    2.4.1 for the earliest version we know the syscall is available.  */
 162 #if __LINUX_KERNEL_VERSION >= 132097
 163 # define __ASSUME_GETDENTS64_SYSCALL    1
 164 #endif
 165
 166 /* When did O_DIRECTORY become available?  Early in 2.3 but when?
 167    Be safe, use 2.3.99.  */
 168 #if __LINUX_KERNEL_VERSION >= 131939
 169 # define __ASSUME_O_DIRECTORY           1
 170 #endif
 171
 172 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 173    up the page size information.  */
 174 #if __LINUX_KERNEL_VERSION >= 132097
 175 # define __ASSUME_AT_PAGESIZE           1
 176 #endif
 177
 178 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
 179    up to the child.  */
 180 #if __LINUX_KERNEL_VERSION >= 132097
 181 # define __ASSUME_AT_XID                1
 182 #endif
 183
 184 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
 185    and the vfork syscall made it into the official kernel.  */
 186 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
 187 # define __ASSUME_STD_AUXV              1
 188 # define __ASSUME_VFORK_SYSCALL         1
 189 #endif
 190
 191 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
 192    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
 193 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
 194     && !defined __powerpc64__
 195 # define __ASSUME_MMAP2_SYSCALL         1
 196 #endif
 197
 198 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
 199    This allows applications to get/set the Floating Point Exception Mode.  */
 200 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
 201 # define __ASSUME_NEW_PRCTL_SYSCALL             1
 202 #endif
 203
 204 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected.  */
 205 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
 206     && !defined __powerpc64__
 207 # define __ASSUME_FIXED_CLONE_SYSCALL           1
 208 #endif
 209
 210 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
 211    The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
 212    to be used in the set/swapcontext implementation.  */
 213 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
 214 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL              1
 215 #endif
 216
 217 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
 218    semantics was changed in 2.5.30, and again after 2.5.31.  */
 219 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
 220 # define __ASSUME_SET_THREAD_AREA_SYSCALL       1
 221 #endif
 222
 223 /* The vfork syscall on x86 and arm was definitely available in 2.4.  */
 224 #if __LINUX_KERNEL_VERSION >= 132097 && defined __i386__
 225 # define __ASSUME_VFORK_SYSCALL         1
 226 #endif
 227
 228 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 229    their availability with one define.  The changes were made first
 230    for i386 and the have to be done separately for the other archs.
 231    For i386 we pick 2.5.50 as the first version with support.
 232    For s390*, SPARC, PPC, x86-64, and SH we pick 2.5.64 as the first
 233    version with support.  */
 234 #if ((__LINUX_KERNEL_VERSION >= 132402 && defined __i386__)             \
 235      || (__LINUX_KERNEL_VERSION >= 132416                               \
 236          && (defined __s390__ || defined __sparc__                      \
 237              || defined __powerpc__ || defined __x86_64__ || defined __sh__)))
 238 # define __ASSUME_CLONE_THREAD_FLAGS    1
 239 #endif
 240
 241 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
 242    timers based on them is available.  */
 243 #if __LINUX_KERNEL_VERSION >= 132415
 244 # define __ASSUME_POSIX_TIMERS          1
 245 #endif
 246
 247 /* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
 248 #if __LINUX_KERNEL_VERSION >= 0x2060c
 249 # define __ASSUME_POSIX_CPU_TIMERS      1
 250 #endif
 251
 252 /* With kernel 2.4.17 we always have netlink support.  */
 253 #if __LINUX_KERNEL_VERSION >= (132096+17)
 254 # define __ASSUME_NETLINK_SUPPORT       1
 255 #endif
 256
 257 /* The requeue futex functionality was introduced in 2.5.70.  */
 258 #if __LINUX_KERNEL_VERSION >= 132422
 259 # define __ASSUME_FUTEX_REQUEUE 1
 260 #endif
 261
 262 /* The statfs64 syscalls are available in 2.5.74.  */
 263 #if __LINUX_KERNEL_VERSION >= 132426
 264 # define __ASSUME_STATFS64      1
 265 #endif
 266
 267 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
 268    flag unconditionally up to the child.  */
 269 #if __LINUX_KERNEL_VERSION >= 132426
 270 # define __ASSUME_AT_SECURE     1
 271 #endif
 272
 273 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
 274    in the si_pid field passed as part of the siginfo_t struct to signal
 275    handlers.  */
 276 #if __LINUX_KERNEL_VERSION >= 132427
 277 # define __ASSUME_CORRECT_SI_PID        1
 278 #endif
 279
 280 /* The tgkill syscall was instroduced for i386 in 2.5.75.  On x86-64,
 281    sparc, SH, ppc, and ppc64 it was introduced in 2.6.0-test3. */
 282 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
 283     || (__LINUX_KERNEL_VERSION >= 132609 \
 284         && (defined __x86_64__ || defined __powerpc__ \
 285             || defined __sh__ || defined __sparc__))
 286 # define __ASSUME_TGKILL        1
 287 #endif
 288
 289 /* The utimes syscall has been available for some architectures
 290    forever.  For x86 it was introduced after 2.5.75, for x86-64,
 291    ppc, and ppc64 it was introduced in 2.6.0-test3.  */
 292 #if defined __sparc__ \
 293     || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
 294     || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
 295     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 296     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 297 # define __ASSUME_UTIMES        1
 298 #endif
 299
 300 // XXX Disabled for now since the semantics we want is not achieved.
 301 #if 0
 302 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series.  */
 303 #if __LINUX_KERNEL_VERSION >= 132609
 304 # define __ASSUME_CLONE_STOPPED 1
 305 #endif
 306 #endif
 307
 308 /* The fixed version of the posix_fadvise64 syscall appeared in
 309    2.6.0-test3.  At least for x86 and sparc.  Powerpc support appeared
 310    in 2.6.2, but for 32-bit userspace only.  */
 311 #if (__LINUX_KERNEL_VERSION >= 132609                           \
 312      && (defined __i386__ || defined __sparc__))                \
 313     || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
 314        && !defined __powerpc64__)
 315 # define __ASSUME_FADVISE64_64_SYSCALL  1
 316 #endif
 317
 318 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
 319    series.  */
 320 #if __LINUX_KERNEL_VERSION >= 132609
 321 # define __ASSUME_PROT_GROWSUPDOWN      1
 322 #endif
 323
 324 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
 325    SIMD (AKA Altivec, VMX) instructions and register state.  This changes
 326    the overall size of the sigcontext and adds the swapcontext syscall.  */
 327 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
 328 # define __ASSUME_SWAPCONTEXT_SYSCALL   1
 329 #endif
 330
 331 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
 332    implied.  */
 333 #if __LINUX_KERNEL_VERSION >= 132610
 334 # define __ASSUME_NO_CLONE_DETACHED     1
 335 #endif
 336
 337 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
 338    information as well and in between 2.6.5 and 2.6.8 most compat wrappers
 339    were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
 340 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
 341     || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
 342 # define __ASSUME_GETDENTS32_D_TYPE     1
 343 #endif
 344
 345 /* Starting with version 2.5.3, the initial location returned by `brk'
 346    after exec is always rounded up to the next page.  */
 347 #if __LINUX_KERNEL_VERSION >= 132355
 348 # define __ASSUME_BRK_PAGE_ROUNDED      1
 349 #endif
 350
 351 /* Starting with version 2.6.9, the waitid system call is available.
 352    Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12.  */
 353 #if (__LINUX_KERNEL_VERSION >= 0x020609 \
 354      && !defined __powerpc__ && !defined __s390__) \
 355     || (__LINUX_KERNEL_VERSION >= 0x02060c \
 356         && (defined __powerpc__ || defined __s390__))
 357 # define __ASSUME_WAITID_SYSCALL        1
 358 #endif
 359
 360 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12.  */
 361 #if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
 362     && defined __arch64__
 363 # define __ASSUME_STAT64_SYSCALL        1
 364 #endif
 365
 366 /* Early kernel used "shm" as the filesystem name for the filesystem used
 367    for shm_open etc.  Later it is "tmpfs".  2.4.20 is a safe bet for the
 368    cutover.  */
 369 #if __LINUX_KERNEL_VERSION >= 0x02041a
 370 # define __ASSUME_TMPFS_NAME    1
 371 #endif
 372
 373 /* pselect/ppoll were introduced just after 2.6.16-rc1.  Due to the way
 374    the kernel versions are advertised we can only rely on 2.6.17 to have
 375    the code.  On x86_64 and SH this appeared first in 2.6.19-rc1,
 376    on ia64 in 2.6.22-rc1.  */
 377 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 378     && ((!defined __x86_64__ && !defined __sh__) \
 379         || (__LINUX_KERNEL_VERSION >= 0x020613 \
 380             && (defined __x86_64__ || defined __sh__)))
 381 # define __ASSUME_PSELECT       1
 382 # define __ASSUME_PPOLL         1
 383 #endif
 384
 385 /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the
 386    kernel versions are advertised we can only rely on 2.6.17 to have
 387    the code.  On PPC they were introduced in 2.6.17-rc1,
 388    on SH in 2.6.19-rc1.  */
 389 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 390     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
 391 # define __ASSUME_ATFCTS        1
 392 #endif
 393
 394 /* Support for inter-process robust mutexes was added in 2.6.17.  */
 395 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 396     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
 397 # define __ASSUME_SET_ROBUST_LIST       1
 398 #endif
 399
 400 /* Pessimistically assume that 2.6.18 introduced real handling of
 401    large numbers of requests to readv and writev and that we don't
 402    need a fallback.  It likely worked for much longer.  */
 403 #if __LINUX_KERNEL_VERSION >= 0x020612
 404 # define __ASSUME_COMPLETE_READV_WRITEV 1
 405 #endif
 406
 407 /* Support for PI futexes was added in 2.6.18.  */
 408 #if __LINUX_KERNEL_VERSION >= 0x020612
 409 # define __ASSUME_FUTEX_LOCK_PI 1
 410 #endif
 411
 412 /* Support for utimensat syscall was added in 2.6.22, on SH
 413    only after 2.6.22-rc1.  */
 414 #if __LINUX_KERNEL_VERSION >= 0x020616 \
 415     && (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020617)
 416 # define __ASSUME_UTIMENSAT     1
 417 #endif
 418
 419 /* Support for private futexes was added in 2.6.22.  */
 420 #if __LINUX_KERNEL_VERSION >= 0x020616
 421 # define __ASSUME_PRIVATE_FUTEX 1
 422 #endif
 423
 424 /* Support for fallocate was added in 2.6.23, on s390
 425    only after 2.6.23-rc1.  */
 426 #if __LINUX_KERNEL_VERSION >= 0x020617 \
 427     && (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618)
 428 # define __ASSUME_FALLOCATE     1
 429 #endif
 430
 431 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 432    x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23.  */
 433 #if __LINUX_KERNEL_VERSION >= 0x020617 \
 434     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 435         || defined __sparc__ || defined __s390__)
 436 # define __ASSUME_O_CLOEXEC     1
 437 #endif
 438
 439 /* Support for ADJ_OFFSET_SS_READ was added in 2.6.24.  */
 440 #if __LINUX_KERNEL_VERSION >= 0x020618
 441 # define __ASSUME_ADJ_OFFSET_SS_READ    1
 442 #endif
 443
 444 /* Support for various CLOEXEC and NONBLOCK flags was added for x86,
 445    x86-64, PPC, IA-64, and SPARC in 2.6.27.  */
 446 #if __LINUX_KERNEL_VERSION >= 0x02061b \
 447     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 448         || defined __sparc__ || defined __s390__)
 449 # define __ASSUME_SOCK_CLOEXEC  1
 450 # define __ASSUME_IN_NONBLOCK   1
 451 # define __ASSUME_PIPE2         1
 452 # define __ASSUME_EVENTFD2      1
 453 # define __ASSUME_SIGNALFD4     1
 454 # define __ASSUME_DUP3          1
 455 #endif
 456
 457 /* Support for the accept4 syscall was added in 2.6.28.  */
 458 #if __LINUX_KERNEL_VERSION >= 0x02061c \
 459     && (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
 460         || defined __sparc__ || defined __s390__)
 461 # define __ASSUME_ACCEPT4       1
 462 #endif
 463
 464 /* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29.  */
 465 #if __LINUX_KERNEL_VERSION >= 0x02061d
 466 # define __ASSUME_FUTEX_CLOCK_REALTIME  1
 467 #endif
 468
 469 /* Support for the AT_RANDOM auxiliary vector entry was added in 2.6.29.  */
 470 #if __LINUX_KERNEL_VERSION >= 0x02061d
 471 # define __ASSUME_AT_RANDOM     1
 472 #endif
 473
 474 /* Support for preadv and pwritev was added in 2.6.30.  */
 475 #if __LINUX_KERNEL_VERSION >= 0x02061e
 476 # define __ASSUME_PREADV        1
 477 # define __ASSUME_PWRITEV       1
 478 #endif
 479
 480 /* Support for F_GETOWN_EX was introduced in 2.6.32.  */
 481 #if __LINUX_KERNEL_VERSION >= 0x020620
 482 # define __ASSUME_F_GETOWN_EX   1
 483 #endif
 484
 485 /* Support for the recvmmsg syscall was added in 2.6.33.  */
 486 #if __LINUX_KERNEL_VERSION >= 0x020621
 487 # define __ASSUME_RECVMMSG      1
 488 #endif
 489
 490 /* statfs fills in f_flags since 2.6.36.  */
 491 #if __LINUX_KERNEL_VERSION >= 0x020624
 492 # define __ASSUME_STATFS_F_FLAGS        1
 493 #endif
 494
 495 /* prlimit64 is available in 2.6.36.  */
 496 #if __LINUX_KERNEL_VERSION >= 0x020624
 497 # define __ASSUME_PRLIMIT64     1
 498 #endif
 499
 500 /* sendmmsg is available in 2.6.39.  */
 501 #if __LINUX_KERNEL_VERSION >= 0x020627
 502 # define __ASSUME_SENDMMSG      1
 503 #endif
 504
 505 /* getcpu is a syscall for x86-64 since 3.1.  */
 506 #if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
 507 # define __ASSUME_GETCPU_SYSCALL        1
 508 #endif