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 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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 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 these are in 2.3.35 on powerpc.  */
 107 #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__
 108 # define __ASSUME_TRUNCATE64_SYSCALL    1
 109 # define __ASSUME_STAT64_SYSCALL        1
 110 # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1
 111 #endif
 112
 113 /* Linux 2.3.39 introduced 32bit UID/GIDs and IPC64.  Some platforms had 32
 114    bit type all along.  */
 115 #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__
 116 # define __ASSUME_32BITUIDS             1
 117 # ifndef __powerpc__
 118 #  define __ASSUME_IPC64                1
 119 # endif
 120 # ifdef __sparc__
 121 #  define __ASSUME_SETRESUID_SYSCALL    1
 122 # endif
 123 #endif
 124
 125 /* Linux 2.4.0 on PPC introduced a correct IPC64.  */
 126 #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__
 127 # define __ASSUME_IPC64                 1
 128 #endif
 129
 130 /* We can use the LDTs for threading with Linux 2.3.99 and newer.  */
 131 #if __LINUX_KERNEL_VERSION >= 131939
 132 # define __ASSUME_LDT_WORKS             1
 133 #endif
 134
 135 /* The changed st_ino field appeared in 2.4.0-test6.  But we cannot
 136    distinguish this version from other 2.4.0 releases.  Therefore play
 137    save and assume it available is for 2.4.1 and up.  */
 138 #if __LINUX_KERNEL_VERSION >= 132097
 139 # define __ASSUME_ST_INO_64_BIT         1
 140 #endif
 141
 142 /* To support locking of large files a new fcntl() syscall was introduced
 143    in 2.4.0-test7.  We test for 2.4.1 for the earliest version we know
 144    the syscall is available.  */
 145 #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__)
 146 # define __ASSUME_FCNTL64               1
 147 #endif
 148
 149 /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I
 150    don't know when it got introduced).  */
 151 #if __LINUX_KERNEL_VERSION >= 132100 \
 152     && (defined __arm__ || defined __powerpc__ || defined __sh__)
 153 # define __ASSUME_FCNTL64               1
 154 #endif
 155
 156 /* The getdents64 syscall was introduced in 2.4.0-test7.  We test for
 157    2.4.1 for the earliest version we know the syscall is available.  */
 158 #if __LINUX_KERNEL_VERSION >= 132097
 159 # define __ASSUME_GETDENTS64_SYSCALL    1
 160 #endif
 161
 162 /* When did O_DIRECTORY became available?  Early in 2.3 but when?
 163    Be safe, use 2.3.99.  */
 164 #if __LINUX_KERNEL_VERSION >= 131939
 165 # define __ASSUME_O_DIRECTORY   1
 166 #endif
 167
 168 /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
 169    up the page size information.  */
 170 #if __LINUX_KERNEL_VERSION >= 132097
 171 # define __ASSUME_AT_PAGESIZE   1
 172 #endif
 173
 174 /* Starting with 2.4.? kernels PPC passes the AUXV in the standard way.  */
 175 #if __LINUX_KERNEL_VERSION >= (132096+99) && defined __powerpc__
 176 # define __ASSUME_STD_AUXV      1
 177 #endif
 178
 179 /* There are an infinite number of PA-RISC kernel versions numbered
 180    2.4.0.  But they've not really been released as such.  We require
 181    and expect the final version here.  */
 182 #ifdef __hppa__
 183 # define __ASSUME_32BITUIDS             1
 184 # define __ASSUME_TRUNCATE64_SYSCALL    1
 185 # define __ASSUME_MMAP2_SYSCALL         1
 186 # define __ASSUME_STAT64_SYSCALL        1
 187 # define __ASSUME_IPC64                 1
 188 # define __ASSUME_ST_INO_64_BIT         1
 189 # define __ASSUME_FCNTL64               1
 190 # define __ASSUME_GETDENTS64_SYSCALL    1
 191 #endif