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, 2000, 2001, 2002 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 /* On x86 another `getrlimit' syscall was added in 2.3.25.  */
  79 #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__
  80 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
  81 #endif
  82
  83 /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31.  */
  84 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  85 # define __ASSUME_TRUNCATE64_SYSCALL    1
  86 #endif
  87
  88 /* On x86 the mmap2 syscall was introduced in 2.3.31.  */
  89 #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__
  90 # define __ASSUME_MMAP2_SYSCALL 1
  91 #endif
  92
  93 /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34.  */
  94 #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__
  95 # define __ASSUME_STAT64_SYSCALL        1
  96 #endif
  97
  98 /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64
  99    syscalls were introduced in 2.3.35.  */
 100 #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__)
 101 # define __ASSUME_TRUNCATE64_SYSCALL    1
 102 # define __ASSUME_MMAP2_SYSCALL         1
 103 # define __ASSUME_STAT64_SYSCALL        1
 104 #endif
 105
 106 /* I know for sure that getrlimit are in 2.3.35 on powerpc.  */
 107 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
 108 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
 109 #endif
 110
 111 /* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
 112    support separate 64-bit syscalls, already 64-bit */
 113 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ \
 114     && !defined __powerpc64__
 115 # define __ASSUME_TRUNCATE64_SYSCALL    1
 116 # define __ASSUME_STAT64_SYSCALL        1
 117 #endif
 118
 119 /* Linux 2.3.39 introduced 32bit UID/GIDs.  Some platforms had 32
 120    bit type all along.  */
 121 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
 122 # define __ASSUME_32BITUIDS             1
 123 #endif
 124
 125 /* Linux 2.3.39 sparc added setresuid.  */
 126 #if __LINUX_KERNEL_VERSION >= 131879 && defined __sparc__
 127 # define __ASSUME_SETRESUID_SYSCALL     1
 128 #endif
 129
 130 /* Linux 2.3.39 introduced IPC64.  Except for powerpc.  */
 131 #if __LINUX_KERNEL_VERSION >= 131879 && !defined __powerpc__
 132 # define __ASSUME_IPC64         1
 133 #endif
 134
 135 /* mips platforms had IPC64 all along.  */
 136 #if defined __mips__
 137 # define __ASSUME_IPC64         1
 138 #endif
 139
 140 /* Linux 2.4.0 on PPC introduced a correct IPC64. But PowerPC64 does not
 141    support a separate 64-bit sys call, already 64-bit */
 142 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ \
 143     && !defined __powerpc64__
 144 # define __ASSUME_IPC64                 1
 145 #endif
 146
 147 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 148 #if __LINUX_KERNEL_VERSION >= 131939
 149 # define __ASSUME_LDT_WORKS             1
 150 #endif
 151
 152 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 153    distinguish this version from other 2.4.0 releases.  Therefore play
 154    save and assume it available is for 2.4.1 and up.  */
 155 #if __LINUX_KERNEL_VERSION >= 132097
 156 # define __ASSUME_ST_INO_64_BIT         1
 157 #endif
 158
 159 /* To support locking of large files a new fcntl() syscall was introduced
 160    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 161    the syscall is available.  */
 162 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 163 # define __ASSUME_FCNTL64               1
 164 #endif
 165
 166 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 167    don't know when it got introduced).  But PowerPC64 does not support
 168    separate FCNTL64 call, FCNTL is already 64-bit */
 169 #if __LINUX_KERNEL_VERSION >= 132100 \
 170     && (defined __arm__ || defined __powerpc__ || defined __sh__) \
 171     && !defined __powerpc64__
 172 # define __ASSUME_FCNTL64               1
 173 #endif
 174
 175 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 176    2.4.1 for the earliest version we know the syscall is available.  */
 177 #if __LINUX_KERNEL_VERSION >= 132097
 178 # define __ASSUME_GETDENTS64_SYSCALL    1
 179 #endif
 180
 181 /* When did O_DIRECTORY became available?  Early in 2.3 but when?
 182    Be safe, use 2.3.99.  */
 183 #if __LINUX_KERNEL_VERSION >= 131939
 184 # define __ASSUME_O_DIRECTORY           1
 185 #endif
 186
 187 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 188    up the page size information.  */
 189 #if __LINUX_KERNEL_VERSION >= 132097
 190 # define __ASSUME_AT_PAGESIZE           1
 191 #endif
 192
 193 /* Starting with at least 2.4.0 the kernel passes the uid/gid unconditionally
 194    up to the child.  */
 195 #if __LINUX_KERNEL_VERSION >= 132097
 196 # define __ASSUME_AT_XID                1
 197 #endif
 198
 199 /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way.  */
 200 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__
 201 # define __ASSUME_STD_AUXV              1
 202 #endif
 203
 204 /* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
 205    kernel.  But PowerPC64 does not support a separate MMAP2 call.  */
 206 #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ \
 207     && !defined __powerpc64__
 208 # define __ASSUME_MMAP2_SYSCALL         1
 209 #endif
 210
 211 /* On x86, the set_thread_area syscall was introduced in 2.5.29, but its
 212    semantics was changed in 2.5.30, and again after 2.5.31.  */
 213 #if __LINUX_KERNEL_VERSION >= 132384 && defined __i386__
 214 # define __ASSUME_SET_THREAD_AREA_SYSCALL       1
 215 #endif
 216
 217 /* There are an infinite number of PA-RISC kernel versions numbered
 218    2.4.0.  But they've not really been released as such.  We require
 219    and expect the final version here.  */
 220 #ifdef __hppa__
 221 # define __ASSUME_32BITUIDS             1
 222 # define __ASSUME_TRUNCATE64_SYSCALL    1
 223 # define __ASSUME_MMAP2_SYSCALL         1
 224 # define __ASSUME_STAT64_SYSCALL        1
 225 # define __ASSUME_IPC64                 1
 226 # define __ASSUME_ST_INO_64_BIT         1
 227 # define __ASSUME_FCNTL64               1
 228 # define __ASSUME_GETDENTS64_SYSCALL    1
 229 #endif