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https://sourceware.org/git/glibc.git
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279 lines
9.5 KiB
C
279 lines
9.5 KiB
C
/* Set flags signalling availability of kernel features based on given
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kernel version number.
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Copyright (C) 1999-2009, 2010, 2011, 2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This file must not contain any C code. At least it must be protected
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to allow using the file also in assembler files. */
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#ifndef __LINUX_KERNEL_VERSION
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/* We assume the worst; all kernels should be supported. */
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# define __LINUX_KERNEL_VERSION 0
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#endif
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/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
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linux/version.h. I.e., the major, minor, and subminor all get a
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byte with the major number being in the highest byte. This means
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we can do numeric comparisons.
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In the following we will define certain symbols depending on
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whether the describes kernel feature is available in the kernel
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version given by __LINUX_KERNEL_VERSION. We are not always exactly
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recording the correct versions in which the features were
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introduced. If somebody cares these values can afterwards be
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corrected. */
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/* The sendfile syscall was introduced in 2.2.0. */
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#define __ASSUME_SENDFILE 1
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/* On x86 the mmap2 syscall was introduced in 2.3.31. */
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#ifdef __i386__
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# define __ASSUME_MMAP2_SYSCALL 1
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#endif
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/* On x86 the stat64/lstat64/fstat64 syscalls were introduced in 2.3.34. */
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#ifdef __i386__
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* On sparc the mmap2/stat64/lstat64/fstat64 syscalls were introduced
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in 2.3.35. */
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#if defined __sparc__ && !defined __arch64__
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# define __ASSUME_MMAP2_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* I know for sure that these are in 2.3.35 on powerpc. But PowerPC64 does not
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support separate 64-bit syscalls, already 64-bit. */
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#if defined __powerpc__ && !defined __powerpc64__
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* Linux 2.3.39 introduced IPC64. Except for powerpc. Linux 2.4.0 on
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PPC introduced a correct IPC64. But PowerPC64 does not support a
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separate 64-bit syscall, already 64-bit. */
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#ifndef __powerpc64__
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# define __ASSUME_IPC64 1
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#endif
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/* SH kernels got stat64 and mmap2 during 2.4.0-test. */
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#ifdef __sh__
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# define __ASSUME_MMAP2_SYSCALL 1
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* The changed st_ino field appeared in 2.4.0-test6. However, SH is lame,
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and still does not have a 64-bit inode field. */
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#ifndef __sh__
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# define __ASSUME_ST_INO_64_BIT 1
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#endif
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/* The getdents64 syscall was introduced in 2.4.0-test7 (but later for
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MIPS n32). */
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#define __ASSUME_GETDENTS64_SYSCALL 1
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/* Starting with 2.4.5 kernels the mmap2 syscall made it into the official
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kernel. But PowerPC64 does not support a separate MMAP2 call. */
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#if defined __powerpc__ && !defined __powerpc64__
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# define __ASSUME_MMAP2_SYSCALL 1
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#endif
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/* Beginning with 2.5.63 support for realtime and monotonic clocks and
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timers based on them is available. */
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#define __ASSUME_POSIX_TIMERS 1
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/* Beginning with 2.6.12 the clock and timer supports CPU clocks. */
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#define __ASSUME_POSIX_CPU_TIMERS 1
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/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
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#define __ASSUME_STATFS64 1
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/* The utimes syscall has been available for some architectures
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forever. For x86 it was introduced after 2.5.75, for x86-64,
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ppc, and ppc64 it was introduced in 2.6.0-test3. */
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#if defined __sparc__ \
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|| defined __i386__ \
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|| defined __x86_64__ \
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|| defined __powerpc__ \
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|| defined __sh__
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# define __ASSUME_UTIMES 1
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#endif
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/* The fixed version of the posix_fadvise64 syscall appeared in
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2.6.0-test3. At least for x86 and sparc. Powerpc support appeared
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in 2.6.2, but for 32-bit userspace only. */
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#if (defined __i386__ || defined __sparc__ \
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|| (defined __powerpc__ && !defined __powerpc64__))
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# define __ASSUME_FADVISE64_64_SYSCALL 1
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#endif
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/* Starting with 2.6.0 PowerPC adds signal/swapcontext support for Vector
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SIMD (AKA Altivec, VMX) instructions and register state. This changes
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the overall size of the sigcontext and adds the swapcontext syscall. */
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#ifdef __powerpc__
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# define __ASSUME_SWAPCONTEXT_SYSCALL 1
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#endif
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/* On sparc64 stat64/lstat64/fstat64 syscalls were introduced in 2.6.12. */
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#if defined __sparc__ && defined __arch64__
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# define __ASSUME_STAT64_SYSCALL 1
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#endif
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/* pselect/ppoll were introduced just after 2.6.16-rc1. Due to the way
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the kernel versions are advertised we can only rely on 2.6.17 to have
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the code. On x86_64 and SH this appeared first in 2.6.19-rc1,
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on ia64 in 2.6.22-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& ((!defined __x86_64__ && !defined __sh__) \
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|| (__LINUX_KERNEL_VERSION >= 0x020613 \
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&& (defined __x86_64__ || defined __sh__)))
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# define __ASSUME_PSELECT 1
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# define __ASSUME_PPOLL 1
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#endif
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/* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
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kernel versions are advertised we can only rely on 2.6.17 to have
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the code. On PPC they were introduced in 2.6.17-rc1,
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on SH in 2.6.19-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
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# define __ASSUME_ATFCTS 1
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#endif
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/* Support for inter-process robust mutexes was added in 2.6.17. */
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#if __LINUX_KERNEL_VERSION >= 0x020611 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
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# define __ASSUME_SET_ROBUST_LIST 1
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#endif
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/* Pessimistically assume that 2.6.18 introduced real handling of
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large numbers of requests to readv and writev and that we don't
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need a fallback. It likely worked for much longer. */
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#if __LINUX_KERNEL_VERSION >= 0x020612
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# define __ASSUME_COMPLETE_READV_WRITEV 1
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#endif
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/* Support for PI futexes was added in 2.6.18. */
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#if __LINUX_KERNEL_VERSION >= 0x020612
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# define __ASSUME_FUTEX_LOCK_PI 1
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#endif
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/* Support for utimensat syscall was added in 2.6.22, on SH
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only after 2.6.22-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020616 \
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&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020617)
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# define __ASSUME_UTIMENSAT 1
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#endif
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/* Support for private futexes was added in 2.6.22. */
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#if __LINUX_KERNEL_VERSION >= 0x020616
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# define __ASSUME_PRIVATE_FUTEX 1
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#endif
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/* Support for fallocate was added in 2.6.23, on s390
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only after 2.6.23-rc1. */
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#if __LINUX_KERNEL_VERSION >= 0x020617 \
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&& (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618)
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# define __ASSUME_FALLOCATE 1
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#endif
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/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
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x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23. */
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#if __LINUX_KERNEL_VERSION >= 0x020617 \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_O_CLOEXEC 1
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#endif
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/* From 2.6.23 onwards the value of ARG_MAX depends on the stack
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size. */
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#define __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL 0x020617
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#if __LINUX_KERNEL_VERSION >= __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL
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# define __ASSUME_ARG_MAX_STACK_BASED 1
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#endif
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/* Support for ADJ_OFFSET_SS_READ was added in 2.6.24. */
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#if __LINUX_KERNEL_VERSION >= 0x020618
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# define __ASSUME_ADJ_OFFSET_SS_READ 1
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#endif
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/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
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x86-64, PPC, IA-64, and SPARC in 2.6.27. */
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#if __LINUX_KERNEL_VERSION >= 0x02061b \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_SOCK_CLOEXEC 1
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# define __ASSUME_IN_NONBLOCK 1
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# define __ASSUME_PIPE2 1
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# define __ASSUME_EVENTFD2 1
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# define __ASSUME_SIGNALFD4 1
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# define __ASSUME_DUP3 1
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#endif
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/* Support for the accept4 syscall was added in 2.6.28. */
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#if __LINUX_KERNEL_VERSION >= 0x02061c \
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&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
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|| defined __sparc__ || defined __s390__)
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# define __ASSUME_ACCEPT4 1
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#endif
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/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */
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#if __LINUX_KERNEL_VERSION >= 0x02061d
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# define __ASSUME_FUTEX_CLOCK_REALTIME 1
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#endif
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/* Support for the AT_RANDOM auxiliary vector entry was added in 2.6.29. */
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#if __LINUX_KERNEL_VERSION >= 0x02061d
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# define __ASSUME_AT_RANDOM 1
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#endif
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/* Support for preadv and pwritev was added in 2.6.30. */
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#if __LINUX_KERNEL_VERSION >= 0x02061e
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# define __ASSUME_PREADV 1
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# define __ASSUME_PWRITEV 1
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#endif
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/* Support for F_GETOWN_EX was introduced in 2.6.32. */
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#if __LINUX_KERNEL_VERSION >= 0x020620
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# define __ASSUME_F_GETOWN_EX 1
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#endif
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/* Support for the recvmmsg syscall was added in 2.6.33. */
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#if __LINUX_KERNEL_VERSION >= 0x020621
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# define __ASSUME_RECVMMSG 1
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#endif
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/* statfs fills in f_flags since 2.6.36. */
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#if __LINUX_KERNEL_VERSION >= 0x020624
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# define __ASSUME_STATFS_F_FLAGS 1
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#endif
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/* prlimit64 is available in 2.6.36. */
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#if __LINUX_KERNEL_VERSION >= 0x020624
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# define __ASSUME_PRLIMIT64 1
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#endif
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/* sendmmsg is available in 2.6.39. */
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#if __LINUX_KERNEL_VERSION >= 0x020627
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# define __ASSUME_SENDMMSG 1
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#endif
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/* getcpu is a syscall for x86-64 since 3.1. */
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#if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
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# define __ASSUME_GETCPU_SYSCALL 1
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#endif
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