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) 1999-2003, 2004, 2005, 2006 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* This file must not contain any C code.  At least it must be protected
  22    to allow using the file also in assembler files.  */
  23
  24 #ifndef __LINUX_KERNEL_VERSION
  25 /* We assume the worst; all kernels should be supported.  */
  26 # define __LINUX_KERNEL_VERSION 0
  27 #endif
  28
  29 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
  30    linux/version.h.  I.e., the major, minor, and subminor all get a
  31    byte with the major number being in the highest byte.  This means
  32    we can do numeric comparisons.
  33
  34    In the following we will define certain symbols depending on
  35    whether the describes kernel feature is available in the kernel
  36    version given by __LINUX_KERNEL_VERSION.  We are not always exactly
  37    recording the correct versions in which the features were
  38    introduced.  If somebody cares these values can afterwards be
  39    corrected.  Most of the numbers here are set corresponding to
  40    2.2.0.  */
  41
  42 /* `getcwd' system call.  */
  43 #if __LINUX_KERNEL_VERSION >= 131584
  44 # define __ASSUME_GETCWD_SYSCALL        1
  45 #endif
  46
  47 /* Real-time signal became usable in 2.1.70.  */
  48 #if __LINUX_KERNEL_VERSION >= 131398
  49 # define __ASSUME_REALTIME_SIGNALS      1
  50 #endif
  51
  52 /* When were the `pread'/`pwrite' syscalls introduced?  */
  53 #if __LINUX_KERNEL_VERSION >= 131584
  54 # define __ASSUME_PREAD_SYSCALL         1
  55 # define __ASSUME_PWRITE_SYSCALL        1
  56 #endif
  57
  58 /* When was `poll' introduced?  */
  59 #if __LINUX_KERNEL_VERSION >= 131584
  60 # define __ASSUME_POLL_SYSCALL          1
  61 #endif
  62
  63 /* The `lchown' syscall was introduced in 2.1.80.  */
  64 #if __LINUX_KERNEL_VERSION >= 131408
  65 # define __ASSUME_LCHOWN_SYSCALL        1
  66 #endif
  67
  68 /* When did the `setresuid' sysall became available?  */
  69 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
  70 # define __ASSUME_SETRESUID_SYSCALL     1
  71 #endif
  72
  73 /* The SIOCGIFNAME ioctl is available starting with 2.1.50.  */
  74 #if __LINUX_KERNEL_VERSION >= 131408
  75 # define __ASSUME_SIOCGIFNAME           1
  76 #endif
  77
  78 /* MSG_NOSIGNAL was at least available with Linux 2.2.0.  */
  79 #if __LINUX_KERNEL_VERSION >= 131584
  80 # define __ASSUME_MSG_NOSIGNAL          1
  81 #endif
  82
  83 /* The sendfile syscall was introduced in 2.2.0.  */
  84 #if __LINUX_KERNEL_VERSION >= 131584
  85 # define __ASSUME_SENDFILE              1
  86 #endif
  87
  88 /* Only very old kernels had no real symlinks for terminal descriptors
  89    in /proc/self/fd.  */
  90 #if __LINUX_KERNEL_VERSION >= 131584
  91 # define __ASSUME_PROC_SELF_FD_SYMLINK  1
  92 #endif
  93
  94 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
  95 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
  96 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  97 #endif
  98
  99 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
 100 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
 101 # define __ASSUME_TRUNCATE64_SYSCALL    1
 102 #endif
 103
 104 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
 105 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
 106 # define __ASSUME_MMAP2_SYSCALL 1
 107 #endif
 108
 109 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
 110 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
 111 # define __ASSUME_STAT64_SYSCALL        1
 112 #endif
 113
 114 /* On sparc the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
 115    syscalls were introduced in 2.3.35.  */
 116 #if __LINUX_KERNEL_VERSION >= 131875 \
 117     && (defined __sparc__ && !defined __arch64__)
 118 # define __ASSUME_TRUNCATE64_SYSCALL    1
 119 # define __ASSUME_MMAP2_SYSCALL         1
 120 # define __ASSUME_STAT64_SYSCALL        1
 121 #endif
 122
 123 /* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
 124 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
 125 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
 126 #endif
 127
 128 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
 129    support separate 64-bit syscalls, already 64-bit */
 130 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
 131     && !defined __powerpc64__
 132 # define __ASSUME_TRUNCATE64_SYSCALL    1
 133 # define __ASSUME_STAT64_SYSCALL        1
 134 #endif
 135
 136 /* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
 137    bit type all along.  */
 138 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__
 139 # define __ASSUME_32BITUIDS             1
 140 #endif
 141
 142 /* Linux 2.3.39 sparc added setresuid.  */
 143 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
 144 # define __ASSUME_SETRESUID_SYSCALL     1
 145 #endif
 146
 147 #if __LINUX_KERNEL_VERSION >= 131879
 148 # define __ASSUME_SETRESGID_SYSCALL     1
 149 #endif
 150
 151 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
 152 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
 153 # define __ASSUME_IPC64         1
 154 #endif
 155
 156 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 157 #if __LINUX_KERNEL_VERSION >= 131939
 158 # define __ASSUME_LDT_WORKS             1
 159 #endif
 160
 161 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
 162    support a separate 64-bit sys call, already 64-bit */
 163 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
 164     && !defined __powerpc64__
 165 # define __ASSUME_IPC64                 1
 166 #endif
 167
 168 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test.  */
 169 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
 170 # define __ASSUME_TRUNCATE64_SYSCALL    1
 171 # define __ASSUME_MMAP2_SYSCALL         1
 172 # define __ASSUME_STAT64_SYSCALL        1
 173 #endif
 174
 175 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 176    distinguish this version from other 2.4.0 releases.  Therefore play
 177    save and assume it available is for 2.4.1 and up.  However, SH is lame,
 178    and still does not have a 64-bit inode field.  */
 179 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
 180 # define __ASSUME_ST_INO_64_BIT         1
 181 #endif
 182
 183 /* To support locking of large files a new fcntl() syscall was introduced
 184    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 185    the syscall is available.  */
 186 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 187 # define __ASSUME_FCNTL64               1
 188 #endif
 189
 190 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
 191    series.  */
 192 #if __LINUX_KERNEL_VERSION >= 132097
 193 # define __ASSUME_AT_CLKTCK             1
 194 #endif
 195
 196 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 197    don't know when it got introduced).  But PowerPC64 does not support
 198    separate FCNTL64 call, FCNTL is already 64-bit */
 199 #if __LINUX_KERNEL_VERSION >= 132100 \
 200     && (defined __powerpc__ || defined __sh__) \
 201     && !defined __powerpc64__
 202 # define __ASSUME_FCNTL64               1
 203 #endif
 204
 205 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 206    2.4.1 for the earliest version we know the syscall is available.  */
 207 #if __LINUX_KERNEL_VERSION >= 132097
 208 # define __ASSUME_GETDENTS64_SYSCALL    1
 209 #endif
 210
 211 /* When did O_DIRECTORY became available?  Early in 2.3 but when?
 212    Be safe, use 2.3.99.  */
 213 #if __LINUX_KERNEL_VERSION >= 131939
 214 # define __ASSUME_O_DIRECTORY           1
 215 #endif
 216
 217 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 218    up the page size information.  */
 219 #if __LINUX_KERNEL_VERSION >= 132097
 220 # define __ASSUME_AT_PAGESIZE           1
 221 #endif
 222
 223 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
 224    up to the child.  */
 225 #if __LINUX_KERNEL_VERSION >= 132097
 226 # define __ASSUME_AT_XID                1
 227 #endif
 228
 229 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
 230    and the vfork syscall made it into the official kernel.  */
 231 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
 232 # define __ASSUME_STD_AUXV              1
 233 # define __ASSUME_VFORK_SYSCALL         1
 234 #endif
 235
 236 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
 237    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
 238 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
 239     && !defined __powerpc64__
 240 # define __ASSUME_MMAP2_SYSCALL         1
 241 #endif
 242
 243 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
 244    This allows applications to get/set the Floating Point Exception Mode.  */
 245 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
 246 # define __ASSUME_NEW_PRCTL_SYSCALL             1
 247 #endif
 248
 249 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected.  */
 250 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
 251     && !defined __powerpc64__
 252 # define __ASSUME_FIXED_CLONE_SYSCALL           1
 253 #endif
 254
 255 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
 256    The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
 257    to be used in the set/swapcontext implementation.  */
 258 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
 259 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL              1
 260 #endif
 261
 262 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
 263    semantics was changed in 2.5.30, and again after 2.5.31.  */
 264 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
 265 # define __ASSUME_SET_THREAD_AREA_SYSCALL       1
 266 #endif
 267
 268 /* The vfork syscall on x86 and arm was definitely available in 2.4.  */
 269 #if __LINUX_KERNEL_VERSION >= 132097 && defined __i386__
 270 # define __ASSUME_VFORK_SYSCALL         1
 271 #endif
 272
 273 /* Alpha switched to a 64-bit timeval sometime before 2.2.0.  */
 274 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
 275 # define __ASSUME_TIMEVAL64             1
 276 #endif
 277
 278 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 279    their availability with one define.  The changes were made first
 280    for i386 and the have to be done separately for the other archs.
 281    For i386 we pick 2.5.50 as the first version with support.
 282    For ia64, s390*, PPC, x86-64, and SH we pick 2.5.64 as the first
 283    version with support.  */
 284 #if ((__LINUX_KERNEL_VERSION >= 132402 && defined __i386__)             \
 285      || (__LINUX_KERNEL_VERSION >= 132416                               \
 286          && (defined __ia64__ || defined __s390__                       \
 287              || defined __powerpc__ || defined __x86_64__ || defined __sh__)))
 288 # define __ASSUME_CLONE_THREAD_FLAGS    1
 289 #endif
 290
 291 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
 292    timers based on them is available.  */
 293 #if __LINUX_KERNEL_VERSION >= 132415
 294 # define __ASSUME_POSIX_TIMERS          1
 295 #endif
 296
 297 /* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
 298 #if __LINUX_KERNEL_VERSION >= 0x2060c
 299 # define __ASSUME_POSIX_CPU_TIMERS      1
 300 #endif
 301
 302 /* With kernel 2.4.17 we always have netlink support.  */
 303 #if __LINUX_KERNEL_VERSION >= (132096+17)
 304 # define __ASSUME_NETLINK_SUPPORT       1
 305 #endif
 306
 307 /* The requeue futex functionality was introduced in 2.5.70.  */
 308 #if __LINUX_KERNEL_VERSION >= 132422
 309 # define __ASSUME_FUTEX_REQUEUE 1
 310 #endif
 311
 312 /* The statfs64 syscalls are available in 2.5.74.  */
 313 #if __LINUX_KERNEL_VERSION >= 132426
 314 # define __ASSUME_STATFS64      1
 315 #endif
 316
 317 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
 318    flag unconditionally up to the child.  */
 319 #if __LINUX_KERNEL_VERSION >= 132426
 320 # define __ASSUME_AT_SECURE     1
 321 #endif
 322
 323 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
 324    in the si_pid field passed as part of the siginfo_t struct to signal
 325    handlers.  */
 326 #if __LINUX_KERNEL_VERSION >= 132427
 327 # define __ASSUME_CORRECT_SI_PID        1
 328 #endif
 329
 330 /* The tgkill syscall was instroduced for i386 in 2.5.75.  For Alpha
 331    it was introduced in 2.6.0-test1 which unfortunately cannot be
 332    distinguished from 2.6.0.  On x86-64, ppc, and ppc64 it was
 333    introduced in 2.6.0-test3. */
 334 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
 335     || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
 336     || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
 337     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 338     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 339 # define __ASSUME_TGKILL        1
 340 #endif
 341
 342 /* The utimes syscall has been available for some architectures
 343    forever.  For x86 it was introduced after 2.5.75, for x86-64,
 344    ppc, and ppc64 it was introduced in 2.6.0-test3.  */
 345 #if defined __alpha__ || defined __ia64__ \
 346     || defined __sparc__ \
 347     || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
 348     || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
 349     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 350     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 351 # define __ASSUME_UTIMES        1
 352 #endif
 353
 354 // XXX Disabled for now since the semantics we want is not achieved.
 355 #if 0
 356 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series.  */
 357 #if __LINUX_KERNEL_VERSION >= 132609
 358 # define __ASSUME_CLONE_STOPPED 1
 359 #endif
 360 #endif
 361
 362 /* The fixed version of the posix_fadvise64 syscall appeared in
 363    2.6.0-test3.  At least for x86.  Powerpc support appeared in
 364    2.6.2, but for 32-bit userspace only.  */
 365 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
 366     || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
 367        && !defined __powerpc64__)
 368 # define __ASSUME_FADVISE64_64_SYSCALL  1
 369 #endif
 370
 371 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
 372    series.  */
 373 #if __LINUX_KERNEL_VERSION >= 132609
 374 # define __ASSUME_PROT_GROWSUPDOWN      1
 375 #endif
 376
 377 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
 378    SIMD (AKA Altivec, VMX) instructions and register state.  This changes
 379    the overall size of the sigcontext and adds the swapcontext syscall.  */
 380 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
 381 # define __ASSUME_SWAPCONTEXT_SYSCALL   1
 382 #endif
 383
 384 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
 385    implied.  */
 386 #if __LINUX_KERNEL_VERSION >= 132610
 387 # define __ASSUME_NO_CLONE_DETACHED     1
 388 #endif
 389
 390 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
 391    information as well and in between 2.6.5 and 2.6.8 most compat wrappers
 392    were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
 393 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
 394     || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
 395 # define __ASSUME_GETDENTS32_D_TYPE     1
 396 #endif
 397
 398 /* Starting with version 2.5.3, the initial location returned by `brk'
 399    after exec is always rounded up to the next page.  */
 400 #if __LINUX_KERNEL_VERSION >= 132355
 401 # define __ASSUME_BRK_PAGE_ROUNDED      1
 402 #endif
 403
 404 /* Starting with version 2.6.9, the waitid system call is available.
 405    Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12.  */
 406 #if (__LINUX_KERNEL_VERSION >= 0x020609 \
 407      && !defined __powerpc__ && !defined __s390__) \
 408     || (__LINUX_KERNEL_VERSION >= 0x02060c \
 409         && (defined __powerpc__ || defined __s390__))
 410 # define __ASSUME_WAITID_SYSCALL        1
 411 #endif
 412
 413 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists.  */
 414 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
 415 #define __ASSUME_IEEE_RAISE_EXCEPTION   1
 416 #endif
 417
 418 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12.  */
 419 #if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
 420     && defined __arch64__
 421 # define __ASSUME_STAT64_SYSCALL        1
 422 #endif
 423
 424 /* Early kernel used "shm" as the filesystem name for the filesystem used
 425    for shm_open etc.  Later it is "tmpfs".  2.4.20 is a safe bet for the
 426    cutover.  */
 427 #if __LINUX_KERNEL_VERSION >= 0x02041a
 428 # define __ASSUME_TMPFS_NAME    1
 429 #endif
 430
 431 /* pselect was introduced just after 2.6.16-rc1.  Due to the way the
 432    kernel versions are advertised we can only rely on 2.6.17 to have
 433    the code.  */
 434 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 435     && (defined __i386__ || defined __powerpc__)
 436 # define __ASSUME_PSELECT       1
 437 #endif
 438
 439 /* ppoll was introduced just after 2.6.16-rc1.  Due to the way the
 440    kernel versions are advertised we can only rely on 2.6.17 to have
 441    the code.  */
 442 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 443     && (defined __i386__ || defined __powerpc__)
 444 # define __ASSUME_PPOLL 1
 445 #endif
 446
 447 /* The *at syscalls were introduced just after 2.6.16-rc1.  Due to the way the
 448    kernel versions are advertised we can only rely on 2.6.17 to have
 449    the code.  */
 450 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 451     && (defined __i386__ || defined __x86_64__)
 452 # define __ASSUME_ATFCTS        1
 453 #endif
 454
 455 /* Support for inter-process robust mutexes was added in 2.6.17.  */
 456 #if __LINUX_KERNEL_VERSION >= 0x020611 \
 457     && (defined __i386__ || defined __x86_64__)
 458 # define __ASSUME_SET_ROBUST_LIST       1
 459 #endif