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 #if defined __mips__
  25 # include <sgidefs.h>
  26 #endif
  27
  28 #ifndef __LINUX_KERNEL_VERSION
  29 /* We assume the worst; all kernels should be supported.  */
  30 # define __LINUX_KERNEL_VERSION 0
  31 #endif
  32
  33 /* We assume for __LINUX_KERNEL_VERSION the same encoding used in
  34    linux/version.h.  I.e., the major, minor, and subminor all get a
  35    byte with the major number being in the highest byte.  This means
  36    we can do numeric comparisons.
  37
  38    In the following we will define certain symbols depending on
  39    whether the describes kernel feature is available in the kernel
  40    version given by __LINUX_KERNEL_VERSION.  We are not always exactly
  41    recording the correct versions in which the features were
  42    introduced.  If somebody cares these values can afterwards be
  43    corrected.  Most of the numbers here are set corresponding to
  44    2.2.0.  */
  45
  46 /* `getcwd' system call.  */
  47 #if __LINUX_KERNEL_VERSION >= 131584
  48 # define __ASSUME_GETCWD_SYSCALL        1
  49 #endif
  50
  51 /* Real-time signal became usable in 2.1.70.  */
  52 #if __LINUX_KERNEL_VERSION >= 131398
  53 # define __ASSUME_REALTIME_SIGNALS      1
  54 #endif
  55
  56 /* When were the `pread'/`pwrite' syscalls introduced?  */
  57 #if __LINUX_KERNEL_VERSION >= 131584
  58 # define __ASSUME_PREAD_SYSCALL         1
  59 # define __ASSUME_PWRITE_SYSCALL        1
  60 #endif
  61
  62 /* When was `poll' introduced?  */
  63 #if __LINUX_KERNEL_VERSION >= 131584
  64 # define __ASSUME_POLL_SYSCALL          1
  65 #endif
  66
  67 /* The `lchown' syscall was introduced in 2.1.80.  */
  68 #if __LINUX_KERNEL_VERSION >= 131408
  69 # define __ASSUME_LCHOWN_SYSCALL        1
  70 #endif
  71
  72 /* When did the `setresuid' sysall became available?  */
  73 #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__
  74 # define __ASSUME_SETRESUID_SYSCALL     1
  75 #endif
  76
  77 /* The SIOCGIFNAME ioctl is available starting with 2.1.50.  */
  78 #if __LINUX_KERNEL_VERSION >= 131408
  79 # define __ASSUME_SIOCGIFNAME           1
  80 #endif
  81
  82 /* MSG_NOSIGNAL was at least available with Linux 2.2.0.  */
  83 #if __LINUX_KERNEL_VERSION >= 131584
  84 # define __ASSUME_MSG_NOSIGNAL          1
  85 #endif
  86
  87 /* The sendfile syscall was introduced in 2.2.0.  */
  88 #if __LINUX_KERNEL_VERSION >= 131584
  89 # define __ASSUME_SENDFILE              1
  90 #endif
  91
  92 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
  93 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
  94 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  95 #endif
  96
  97 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
  98 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  99 # define __ASSUME_TRUNCATE64_SYSCALL    1
 100 #endif
 101
 102 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
 103 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
 104 # define __ASSUME_MMAP2_SYSCALL 1
 105 #endif
 106
 107 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
 108 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
 109 # define __ASSUME_STAT64_SYSCALL        1
 110 #endif
 111
 112 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
 113    syscalls were introduced in 2.3.35.  */
 114 #if __LINUX_KERNEL_VERSION >= 131875 \
 115     && ((defined __sparc__ && !defined __arch64__) || defined __arm__)
 116 # define __ASSUME_TRUNCATE64_SYSCALL    1
 117 # define __ASSUME_MMAP2_SYSCALL         1
 118 # define __ASSUME_STAT64_SYSCALL        1
 119 #endif
 120
 121 /* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
 122 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
 123 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
 124 #endif
 125
 126 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
 127    support separate 64-bit syscalls, already 64-bit */
 128 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
 129     && !defined __powerpc64__
 130 # define __ASSUME_TRUNCATE64_SYSCALL    1
 131 # define __ASSUME_STAT64_SYSCALL        1
 132 #endif
 133
 134 /* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
 135    bit type all along.  */
 136 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
 137 # define __ASSUME_32BITUIDS             1
 138 #endif
 139
 140 /* Linux 2.3.39 sparc added setresuid.  */
 141 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
 142 # define __ASSUME_SETRESUID_SYSCALL     1
 143 #endif
 144
 145 #if __LINUX_KERNEL_VERSION >= 131879
 146 # define __ASSUME_SETRESGID_SYSCALL     1
 147 #endif
 148
 149 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
 150 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
 151 # define __ASSUME_IPC64         1
 152 #endif
 153
 154 /* MIPS platforms had IPC64 all along.  */
 155 #if defined __mips__
 156 # define __ASSUME_IPC64         1
 157 #endif
 158
 159 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 160 #if __LINUX_KERNEL_VERSION >= 131939
 161 # define __ASSUME_LDT_WORKS             1
 162 #endif
 163
 164 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
 165    support a separate 64-bit sys call, already 64-bit */
 166 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
 167     && !defined __powerpc64__
 168 # define __ASSUME_IPC64                 1
 169 #endif
 170
 171 /* SH kernels got stat64, mmap2, and truncate64 during 2.4.0-test.  */
 172 #if __LINUX_KERNEL_VERSION >= 132096 && defined __sh__
 173 # define __ASSUME_TRUNCATE64_SYSCALL    1
 174 # define __ASSUME_MMAP2_SYSCALL         1
 175 # define __ASSUME_STAT64_SYSCALL        1
 176 #endif
 177
 178 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 179    distinguish this version from other 2.4.0 releases.  Therefore play
 180    save and assume it available is for 2.4.1 and up.  However, SH is lame,
 181    and still does not have a 64-bit inode field.  */
 182 #if __LINUX_KERNEL_VERSION >= 132097 && !defined __alpha__ && !defined __sh__
 183 # define __ASSUME_ST_INO_64_BIT         1
 184 #endif
 185
 186 /* To support locking of large files a new fcntl() syscall was introduced
 187    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 188    the syscall is available.  */
 189 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 190 # define __ASSUME_FCNTL64               1
 191 #endif
 192
 193 /* The AT_CLKTCK auxiliary vector entry was introduction in the 2.4.0
 194    series.  */
 195 #if __LINUX_KERNEL_VERSION >= 132097
 196 # define __ASSUME_AT_CLKTCK             1
 197 #endif
 198
 199 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 200    don't know when it got introduced).  But PowerPC64 does not support
 201    separate FCNTL64 call, FCNTL is already 64-bit */
 202 #if __LINUX_KERNEL_VERSION >= 132100 \
 203     && (defined __arm__ || defined __powerpc__ || defined __sh__) \
 204     && !defined __powerpc64__
 205 # define __ASSUME_FCNTL64               1
 206 #endif
 207
 208 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 209    2.4.1 for the earliest version we know the syscall is available.  */
 210 #if __LINUX_KERNEL_VERSION >= 132097
 211 # define __ASSUME_GETDENTS64_SYSCALL    1
 212 #endif
 213
 214 /* When did O_DIRECTORY became available?  Early in 2.3 but when?
 215    Be safe, use 2.3.99.  */
 216 #if __LINUX_KERNEL_VERSION >= 131939
 217 # define __ASSUME_O_DIRECTORY           1
 218 #endif
 219
 220 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 221    up the page size information.  */
 222 #if __LINUX_KERNEL_VERSION >= 132097
 223 # define __ASSUME_AT_PAGESIZE           1
 224 #endif
 225
 226 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
 227    up to the child.  */
 228 #if __LINUX_KERNEL_VERSION >= 132097
 229 # define __ASSUME_AT_XID                1
 230 #endif
 231
 232 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way
 233    and the vfork syscall made it into the official kernel.  */
 234 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
 235 # define __ASSUME_STD_AUXV              1
 236 # define __ASSUME_VFORK_SYSCALL         1
 237 #endif
 238
 239 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
 240    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
 241 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
 242     && !defined __powerpc64__
 243 # define __ASSUME_MMAP2_SYSCALL         1
 244 #endif
 245
 246 /* Starting with 2.4.21 PowerPC implements the new prctl syscall.
 247    This allows applications to get/set the Floating Point Exception Mode.  */
 248 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__
 249 # define __ASSUME_NEW_PRCTL_SYSCALL             1
 250 #endif
 251
 252 /* Starting with 2.4.21 the PowerPC32 clone syscall works as expected.  */
 253 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc__ \
 254     && !defined __powerpc64__
 255 # define __ASSUME_FIXED_CLONE_SYSCALL           1
 256 #endif
 257
 258 /* Starting with 2.4.21 PowerPC64 implements the new rt_sigreturn syscall.
 259    The new rt_sigreturn takes an ucontext pointer allowing rt_sigreturn
 260    to be used in the set/swapcontext implementation.  */
 261 #if __LINUX_KERNEL_VERSION >= (132096+21) && defined __powerpc64__
 262 # define __ASSUME_NEW_RT_SIGRETURN_SYSCALL              1
 263 #endif
 264
 265 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
 266    semantics was changed in 2.5.30, and again after 2.5.31.  */
 267 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
 268 # define __ASSUME_SET_THREAD_AREA_SYSCALL       1
 269 #endif
 270
 271 /* The vfork syscall on x86 and arm was definitely available in 2.4.  */
 272 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __arm__)
 273 # define __ASSUME_VFORK_SYSCALL         1
 274 #endif
 275
 276 /* There are an infinite number of PA-RISC kernel versions numbered
 277    2.4.0.  But they've not really been released as such.  We require
 278    and expect the final version here.  */
 279 #ifdef __hppa__
 280 # define __ASSUME_32BITUIDS             1
 281 # define __ASSUME_TRUNCATE64_SYSCALL    1
 282 # define __ASSUME_MMAP2_SYSCALL         1
 283 # define __ASSUME_STAT64_SYSCALL        1
 284 # define __ASSUME_IPC64                 1
 285 # define __ASSUME_ST_INO_64_BIT         1
 286 # define __ASSUME_FCNTL64               1
 287 # define __ASSUME_GETDENTS64_SYSCALL    1
 288 #endif
 289
 290 /* Alpha switched to a 64-bit timeval sometime before 2.2.0.  */
 291 #if __LINUX_KERNEL_VERSION >= 131584 && defined __alpha__
 292 # define __ASSUME_TIMEVAL64             1
 293 #endif
 294
 295 #if defined __mips__ && _MIPS_SIM == _ABIN32
 296 # define __ASSUME_FCNTL64               1
 297 #endif
 298
 299 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 300    their availability with one define.  The changes were made first
 301    for i386 and the have to be done separately for the other archs.
 302    For i386 we pick 2.5.50 as the first version with support.  */
 303 #if __LINUX_KERNEL_VERSION >= 132402 && defined __i386__
 304 # define __ASSUME_CLONE_THREAD_FLAGS    1
 305 #endif
 306
 307 /* These features were surely available with 2.4.12.  */
 308 #if __LINUX_KERNEL_VERSION >= 132108 && defined __mc68000__
 309 # define __ASSUME_MMAP2_SYSCALL         1
 310 # define __ASSUME_TRUNCATE64_SYSCALL    1
 311 # define __ASSUME_STAT64_SYSCALL        1
 312 # define __ASSUME_FCNTL64               1
 313 # define __ASSUME_VFORK_SYSCALL         1
 314 #endif
 315
 316 /* Beginning with 2.5.63 support for realtime and monotonic clocks and
 317    timers based on them is available.  */
 318 #if __LINUX_KERNEL_VERSION >= 132415
 319 # define __ASSUME_POSIX_TIMERS          1
 320 #endif
 321
 322 /* Beginning with 2.6.12 the clock and timer supports CPU clocks.  */
 323 #if __LINUX_KERNEL_VERSION >= 0x2060c
 324 # define __ASSUME_POSIX_CPU_TIMERS      1
 325 #endif
 326
 327 /* The late 2.5 kernels saw a lot of new CLONE_* flags.  Summarize
 328    their availability with one define.  The changes were made first
 329    for i386 and the have to be done separately for the other archs.
 330    For ia64, s390*, PPC, x86-64 we pick 2.5.64 as the first version
 331    with support.  */
 332 #if __LINUX_KERNEL_VERSION >= 132416 \
 333     && (defined __ia64__ || defined __s390__ || defined __powerpc__ \
 334         || defined __x86_64__ || defined __sh__)
 335 # define __ASSUME_CLONE_THREAD_FLAGS    1
 336 #endif
 337
 338 /* With kernel 2.4.17 we always have netlink support.  */
 339 #if __LINUX_KERNEL_VERSION >= (132096+17)
 340 # define __ASSUME_NETLINK_SUPPORT       1
 341 #endif
 342
 343 /* The requeue futex functionality was introduced in 2.5.70.  */
 344 #if __LINUX_KERNEL_VERSION >= 132422
 345 # define __ASSUME_FUTEX_REQUEUE 1
 346 #endif
 347
 348 /* The statfs64 syscalls are available in 2.5.74.  */
 349 #if __LINUX_KERNEL_VERSION >= 132426
 350 # define __ASSUME_STATFS64      1
 351 #endif
 352
 353 /* Starting with at least 2.5.74 the kernel passes the setuid-like exec
 354    flag unconditionally up to the child.  */
 355 #if __LINUX_KERNEL_VERSION >= 132426
 356 # define __ASSUME_AT_SECURE     1
 357 #endif
 358
 359 /* Starting with the 2.5.75 kernel the kernel fills in the correct value
 360    in the si_pid field passed as part of the siginfo_t struct to signal
 361    handlers.  */
 362 #if __LINUX_KERNEL_VERSION >= 132427
 363 # define __ASSUME_CORRECT_SI_PID        1
 364 #endif
 365
 366 /* The tgkill syscall was instroduced for i386 in 2.5.75.  For Alpha
 367    it was introduced in 2.6.0-test1 which unfortunately cannot be
 368    distinguished from 2.6.0.  On x86-64, ppc, and ppc64 it was
 369    introduced in 2.6.0-test3. */
 370 #if (__LINUX_KERNEL_VERSION >= 132427 && defined __i386__) \
 371     || (__LINUX_KERNEL_VERSION >= 132609 && defined __alpha__) \
 372     || (__LINUX_KERNEL_VERSION >= 132609 && defined __x86_64__) \
 373     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 374     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 375 # define __ASSUME_TGKILL        1
 376 #endif
 377
 378 /* The utimes syscall has been available for some architectures
 379    forever.  For x86 it was introduced after 2.5.75, for x86-64,
 380    ppc, and ppc64 it was introduced in 2.6.0-test3.  */
 381 #if defined __alpha__ || defined __ia64__ || defined __hppa__ \
 382     || defined __sparc__ \
 383     || (__LINUX_KERNEL_VERSION > 132427 && defined __i386__) \
 384     || (__LINUX_KERNEL_VERSION > 132609 && defined __x86_64__) \
 385     || (__LINUX_KERNEL_VERSION >= 132609 && defined __powerpc__) \
 386     || (__LINUX_KERNEL_VERSION >= 132609 && defined __sh__)
 387 # define __ASSUME_UTIMES        1
 388 #endif
 389
 390 // XXX Disabled for now since the semantics we want is not achieved.
 391 #if 0
 392 /* The CLONE_STOPPED flag was introduced in the 2.6.0-test1 series.  */
 393 #if __LINUX_KERNEL_VERSION >= 132609
 394 # define __ASSUME_CLONE_STOPPED 1
 395 #endif
 396 #endif
 397
 398 /* The fixed version of the posix_fadvise64 syscall appeared in
 399    2.6.0-test3.  At least for x86.  Powerpc support appeared in
 400    2.6.2, but for 32-bit userspace only.  */
 401 #if (__LINUX_KERNEL_VERSION >= 132609 && defined __i386__) \
 402     || (__LINUX_KERNEL_VERSION >= 132610 && defined __powerpc__ \
 403        && !defined __powerpc64__)
 404 # define __ASSUME_FADVISE64_64_SYSCALL  1
 405 #endif
 406
 407 /* The PROT_GROWSDOWN/PROT_GROWSUP flags were introduced in the 2.6.0-test
 408    series.  */
 409 #if __LINUX_KERNEL_VERSION >= 132609
 410 # define __ASSUME_PROT_GROWSUPDOWN      1
 411 #endif
 412
 413 /* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
 414    SIMD (AKA Altivec, VMX) instructions and register state.  This changes
 415    the overall size of the sigcontext and adds the swapcontext syscall.  */
 416 #if __LINUX_KERNEL_VERSION >= 132608 && defined __powerpc__
 417 # define __ASSUME_SWAPCONTEXT_SYSCALL   1
 418 #endif
 419
 420 /* The CLONE_DETACHED flag is not necessary in 2.6.2 kernels, it is
 421    implied.  */
 422 #if __LINUX_KERNEL_VERSION >= 132610
 423 # define __ASSUME_NO_CLONE_DETACHED     1
 424 #endif
 425
 426 /* Starting with version 2.6.4-rc1 the getdents syscall returns d_type
 427    information as well and in between 2.6.5 and 2.6.8 most compat wrappers
 428    were fixed too.  Except s390{,x} which was fixed in 2.6.11.  */
 429 #if (__LINUX_KERNEL_VERSION >= 0x020608 && !defined __s390__) \
 430     || (__LINUX_KERNEL_VERSION >= 0x02060b && defined __s390__)
 431 # define __ASSUME_GETDENTS32_D_TYPE     1
 432 #endif
 433
 434 /* Starting with version 2.5.3, the initial location returned by `brk'
 435    after exec is always rounded up to the next page.  */
 436 #if __LINUX_KERNEL_VERSION >= 132355
 437 # define __ASSUME_BRK_PAGE_ROUNDED      1
 438 #endif
 439
 440 /* Starting with version 2.6.9, the waitid system call is available.
 441    Except for powerpc{,64} and s390{,x}, where it is available in 2.6.12.  */
 442 #if (__LINUX_KERNEL_VERSION >= 0x020609 \
 443      && !defined __powerpc__ && !defined __s390__) \
 444     || (__LINUX_KERNEL_VERSION >= 0x02060c \
 445         && (defined __powerpc__ || defined __s390__))
 446 # define __ASSUME_WAITID_SYSCALL        1
 447 #endif
 448
 449 /* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists.  */
 450 #if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
 451 #define __ASSUME_IEEE_RAISE_EXCEPTION   1
 452 #endif
 453
 454 /* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12.  */
 455 #if __LINUX_KERNEL_VERSION >= 0x02060c && defined __sparc__ \
 456     && defined __arch64__
 457 # define __ASSUME_STAT64_SYSCALL        1
 458 #endif