| 1 | /* Set flags signalling availability of kernel features based on given |
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| 2 | kernel version number. |
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| 3 | Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, write to the Free |
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| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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| 19 | 02111-1307 USA. */ |
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| 20 | |
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| 21 | /* This file must not contain any C code. At least it must be protected |
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| 22 | to allow using the file also in assembler files. */ |
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| 23 | |
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| 24 | #ifndef __LINUX_KERNEL_VERSION |
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| 25 | /* We assume the worst; all kernels should be supported. */ |
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| 26 | # define __LINUX_KERNEL_VERSION 0 |
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| 27 | #endif |
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| 28 | |
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| 29 | /* We assume for __LINUX_KERNEL_VERSION the same encoding used in |
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| 30 | linux/version.h. I.e., the major, minor, and subminor all get a |
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| 31 | byte with the major number being in the highest byte. This means |
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| 32 | we can do numeric comparisons. |
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| 33 | |
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| 34 | In the following we will define certain symbols depending on |
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| 35 | whether the describes kernel feature is available in the kernel |
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| 36 | version given by __LINUX_KERNEL_VERSION. We are not always exactly |
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| 37 | recording the correct versions in which the features were |
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| 38 | introduced. If somebody cares these values can afterwards be |
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| 39 | corrected. Most of the numbers here are set corresponding to |
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| 40 | 2.2.0. */ |
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| 41 | |
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| 42 | /* `getcwd' system call. */ |
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| 43 | #if __LINUX_KERNEL_VERSION >= 131584 |
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| 44 | # define __ASSUME_GETCWD_SYSCALL 1 |
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| 45 | #endif |
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| 46 | |
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| 47 | /* Real-time signal became usable in 2.1.70. */ |
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| 48 | #if __LINUX_KERNEL_VERSION >= 131398 |
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| 49 | # define __ASSUME_REALTIME_SIGNALS 1 |
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| 50 | #endif |
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| 51 | |
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| 52 | /* When were the `pread'/`pwrite' syscalls introduced? */ |
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| 53 | #if __LINUX_KERNEL_VERSION >= 131584 |
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| 54 | # define __ASSUME_PREAD_SYSCALL 1 |
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| 55 | # define __ASSUME_PWRITE_SYSCALL 1 |
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| 56 | #endif |
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| 57 | |
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| 58 | /* When was `poll' introduced? */ |
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| 59 | #if __LINUX_KERNEL_VERSION >= 131584 |
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| 60 | # define __ASSUME_POLL_SYSCALL 1 |
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| 61 | #endif |
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| 62 | |
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| 63 | /* The `lchown' syscall was introduced in 2.1.80. */ |
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| 64 | #if __LINUX_KERNEL_VERSION >= 131408 |
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| 65 | # define __ASSUME_LCHOWN_SYSCALL 1 |
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| 66 | #endif |
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| 67 | |
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| 68 | /* When did the `setresuid' sysall became available? */ |
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| 69 | #if __LINUX_KERNEL_VERSION >= 131584 && !defined __sparc__ |
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| 70 | # define __ASSUME_SETRESUID_SYSCALL 1 |
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| 71 | #endif |
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| 72 | |
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| 73 | /* The SIOCGIFNAME ioctl is available starting with 2.1.50. */ |
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| 74 | #if __LINUX_KERNEL_VERSION >= 131408 |
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| 75 | # define __ASSUME_SIOCGIFNAME 1 |
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| 76 | #endif |
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| 77 | |
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| 78 | /* On x86 another `getrlimit' syscall was added in 2.3.25. */ |
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| 79 | #if __LINUX_KERNEL_VERSION >= 131865 && defined __i386__ |
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| 80 | # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 |
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| 81 | #endif |
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| 82 | |
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| 83 | /* On x86 the truncate64/ftruncate64 syscalls were introduced in 2.3.31. */ |
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| 84 | #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ |
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| 85 | # define __ASSUME_TRUNCATE64_SYSCALL 1 |
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| 86 | #endif |
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| 87 | |
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| 88 | /* On x86 the mmap2 syscall was introduced in 2.3.31. */ |
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| 89 | #if __LINUX_KERNEL_VERSION >= 131871 && defined __i386__ |
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| 90 | # define __ASSUME_MMAP2_SYSCALL 1 |
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| 91 | #endif |
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| 92 | |
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| 93 | /* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */ |
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| 94 | #if __LINUX_KERNEL_VERSION >= 131874 && defined __i386__ |
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| 95 | # define __ASSUME_STAT64_SYSCALL 1 |
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| 96 | #endif |
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| 97 | |
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| 98 | /* On sparc and ARM the truncate64/ftruncate64/mmap2/stat64/lstat64/fstat64 |
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| 99 | syscalls were introduced in 2.3.35. */ |
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| 100 | #if __LINUX_KERNEL_VERSION >= 131875 && (defined __sparc__ || defined __arm__) |
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| 101 | # define __ASSUME_TRUNCATE64_SYSCALL 1 |
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| 102 | # define __ASSUME_MMAP2_SYSCALL 1 |
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| 103 | # define __ASSUME_STAT64_SYSCALL 1 |
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| 104 | #endif |
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| 105 | |
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| 106 | /* I know for sure that these are in 2.3.35 on powerpc. */ |
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| 107 | #if __LINUX_KERNEL_VERSION >= 131875 && defined __powerpc__ |
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| 108 | # define __ASSUME_TRUNCATE64_SYSCALL 1 |
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| 109 | # define __ASSUME_STAT64_SYSCALL 1 |
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| 110 | # define __ASSUME_NEW_GETRLIMIT_SYSCALL 1 |
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| 111 | #endif |
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| 112 | |
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| 113 | /* Linux 2.3.39 introduced 32bit UID/GIDs and IPC64. Some platforms had 32 |
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| 114 | bit type all along. */ |
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| 115 | #if __LINUX_KERNEL_VERSION >= 131879 || defined __powerpc__ || defined __mips__ |
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| 116 | # define __ASSUME_32BITUIDS 1 |
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| 117 | # ifndef __powerpc__ |
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| 118 | # define __ASSUME_IPC64 1 |
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| 119 | # endif |
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| 120 | # ifdef __sparc__ |
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| 121 | # define __ASSUME_SETRESUID_SYSCALL 1 |
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| 122 | # endif |
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| 123 | #endif |
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| 124 | |
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| 125 | /* Linux 2.4.0 on PPC introduced a correct IPC64. */ |
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| 126 | #if __LINUX_KERNEL_VERSION >= 132096 && defined __powerpc__ |
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| 127 | # define __ASSUME_IPC64 1 |
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| 128 | #endif |
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| 129 | |
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| 130 | /* We can use the LDTs for threading with Linux 2.3.99 and newer. */ |
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| 131 | #if __LINUX_KERNEL_VERSION >= 131939 |
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| 132 | # define __ASSUME_LDT_WORKS 1 |
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| 133 | #endif |
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| 134 | |
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| 135 | /* The changed st_ino field appeared in 2.4.0-test6. But we cannot |
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| 136 | distinguish this version from other 2.4.0 releases. Therefore play |
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| 137 | save and assume it available is for 2.4.1 and up. */ |
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| 138 | #if __LINUX_KERNEL_VERSION >= 132097 |
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| 139 | # define __ASSUME_ST_INO_64_BIT 1 |
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| 140 | #endif |
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| 141 | |
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| 142 | /* To support locking of large files a new fcntl() syscall was introduced |
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| 143 | in 2.4.0-test7. We test for 2.4.1 for the earliest version we know |
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| 144 | the syscall is available. */ |
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| 145 | #if __LINUX_KERNEL_VERSION >= 132097 && (defined __i386__ || defined __sparc__) |
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| 146 | # define __ASSUME_FCNTL64 1 |
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| 147 | #endif |
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| 148 | |
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| 149 | /* Arm got fcntl64 in 2.4.4, PowerPC and SH have it also in 2.4.4 (I |
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| 150 | don't know when it got introduced). */ |
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| 151 | #if __LINUX_KERNEL_VERSION >= 132100 \ |
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| 152 | && (defined __arm__ || defined __powerpc__ || defined __sh__) |
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| 153 | # define __ASSUME_FCNTL64 1 |
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| 154 | #endif |
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| 155 | |
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| 156 | /* The getdents64 syscall was introduced in 2.4.0-test7. We test for |
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| 157 | 2.4.1 for the earliest version we know the syscall is available. */ |
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| 158 | #if __LINUX_KERNEL_VERSION >= 132097 |
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| 159 | # define __ASSUME_GETDENTS64_SYSCALL 1 |
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| 160 | #endif |
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| 161 | |
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| 162 | /* When did O_DIRECTORY became available? Early in 2.3 but when? |
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| 163 | Be safe, use 2.3.99. */ |
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| 164 | #if __LINUX_KERNEL_VERSION >= 131939 |
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| 165 | # define __ASSUME_O_DIRECTORY 1 |
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| 166 | #endif |
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| 167 | |
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| 168 | /* Starting with one of the 2.4.0 pre-releases the Linux kernel passes |
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| 169 | up the page size information. */ |
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| 170 | #if __LINUX_KERNEL_VERSION >= 132097 |
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| 171 | # define __ASSUME_AT_PAGESIZE 1 |
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| 172 | #endif |
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| 173 | |
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| 174 | /* Starting with 2.4.5 kernels PPC passes the AUXV in the standard way |
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| 175 | and the mmap2 syscall made it into the official kernel. */ |
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| 176 | #if __LINUX_KERNEL_VERSION >= (132096+5) && defined __powerpc__ |
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| 177 | # define __ASSUME_STD_AUXV 1 |
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| 178 | # define __ASSUME_MMAP2_SYSCALL 1 |
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| 179 | #endif |
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| 180 | |
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| 181 | /* There are an infinite number of PA-RISC kernel versions numbered |
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| 182 | 2.4.0. But they've not really been released as such. We require |
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| 183 | and expect the final version here. */ |
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| 184 | #ifdef __hppa__ |
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| 185 | # define __ASSUME_32BITUIDS 1 |
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| 186 | # define __ASSUME_TRUNCATE64_SYSCALL 1 |
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| 187 | # define __ASSUME_MMAP2_SYSCALL 1 |
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| 188 | # define __ASSUME_STAT64_SYSCALL 1 |
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| 189 | # define __ASSUME_IPC64 1 |
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| 190 | # define __ASSUME_ST_INO_64_BIT 1 |
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| 191 | # define __ASSUME_FCNTL64 1 |
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| 192 | # define __ASSUME_GETDENTS64_SYSCALL 1 |
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| 193 | #endif |
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