mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 03:23:34 +08:00
236 lines
8.0 KiB
C
236 lines
8.0 KiB
C
/* Set flags signalling availability of kernel features based on given
|
|
kernel version number.
|
|
Copyright (C) 1999-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* This file must not contain any C code. At least it must be protected
|
|
to allow using the file also in assembler files. */
|
|
|
|
#ifndef __LINUX_KERNEL_VERSION
|
|
/* We assume the worst; all kernels should be supported. */
|
|
# define __LINUX_KERNEL_VERSION 0
|
|
#endif
|
|
|
|
/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
|
|
linux/version.h. I.e., the major, minor, and subminor all get a
|
|
byte with the major number being in the highest byte. This means
|
|
we can do numeric comparisons.
|
|
|
|
In the following we will define certain symbols depending on
|
|
whether the describes kernel feature is available in the kernel
|
|
version given by __LINUX_KERNEL_VERSION. We are not always exactly
|
|
recording the correct versions in which the features were
|
|
introduced. If somebody cares these values can afterwards be
|
|
corrected. */
|
|
|
|
/* The sendfile syscall was introduced in 2.2.0. */
|
|
#define __ASSUME_SENDFILE 1
|
|
|
|
/* Linux 2.3.39 introduced IPC64. Except for powerpc. Linux 2.4.0 on
|
|
PPC introduced a correct IPC64. But PowerPC64 does not support a
|
|
separate 64-bit syscall, already 64-bit. */
|
|
#ifndef __powerpc64__
|
|
# define __ASSUME_IPC64 1
|
|
#endif
|
|
|
|
/* The changed st_ino field appeared in 2.4.0-test6. However, SH is lame,
|
|
and still does not have a 64-bit inode field. */
|
|
#ifndef __sh__
|
|
# define __ASSUME_ST_INO_64_BIT 1
|
|
#endif
|
|
|
|
/* The getdents64 syscall was introduced in 2.4.0-test7 (but later for
|
|
MIPS n32). */
|
|
#define __ASSUME_GETDENTS64_SYSCALL 1
|
|
|
|
/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
|
|
#define __ASSUME_STATFS64 1
|
|
|
|
/* The utimes syscall has been available for some architectures
|
|
forever. For x86 it was introduced after 2.5.75, for x86-64,
|
|
ppc, and ppc64 it was introduced in 2.6.0-test3, for s390 it was
|
|
introduced in 2.6.21-rc5. */
|
|
#if defined __sparc__ \
|
|
|| defined __i386__ \
|
|
|| defined __x86_64__ \
|
|
|| defined __powerpc__ \
|
|
|| defined __sh__ \
|
|
|| (defined __s390__ && __LINUX_KERNEL_VERSION >= 0x020616)
|
|
# define __ASSUME_UTIMES 1
|
|
#endif
|
|
|
|
/* pselect/ppoll were introduced just after 2.6.16-rc1. Due to the way
|
|
the kernel versions are advertised we can only rely on 2.6.17 to have
|
|
the code. On x86_64 and SH this appeared first in 2.6.19-rc1,
|
|
on ia64 in 2.6.22-rc1. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& ((!defined __x86_64__ && !defined __sh__) \
|
|
|| (__LINUX_KERNEL_VERSION >= 0x020613 \
|
|
&& (defined __x86_64__ || defined __sh__)))
|
|
# define __ASSUME_PSELECT 1
|
|
# define __ASSUME_PPOLL 1
|
|
#endif
|
|
|
|
/* The *at syscalls were introduced just after 2.6.16-rc1. Due to the way the
|
|
kernel versions are advertised we can only rely on 2.6.17 to have
|
|
the code. On PPC they were introduced in 2.6.17-rc1,
|
|
on SH in 2.6.19-rc1. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
|
|
# define __ASSUME_ATFCTS 1
|
|
#endif
|
|
|
|
/* Support for inter-process robust mutexes was added in 2.6.17. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020611 \
|
|
&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020613)
|
|
# define __ASSUME_SET_ROBUST_LIST 1
|
|
#endif
|
|
|
|
/* Pessimistically assume that 2.6.18 introduced real handling of
|
|
large numbers of requests to readv and writev and that we don't
|
|
need a fallback. It likely worked for much longer. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020612
|
|
# define __ASSUME_COMPLETE_READV_WRITEV 1
|
|
#endif
|
|
|
|
/* Support for PI futexes was added in 2.6.18. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020612
|
|
# define __ASSUME_FUTEX_LOCK_PI 1
|
|
#endif
|
|
|
|
/* Support for utimensat syscall was added in 2.6.22, on SH
|
|
only after 2.6.22-rc1. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020616 \
|
|
&& (!defined __sh__ || __LINUX_KERNEL_VERSION >= 0x020617)
|
|
# define __ASSUME_UTIMENSAT 1
|
|
#endif
|
|
|
|
/* Support for private futexes was added in 2.6.22. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020616
|
|
# define __ASSUME_PRIVATE_FUTEX 1
|
|
#endif
|
|
|
|
/* Support for fallocate was added in 2.6.23, on s390
|
|
only after 2.6.23-rc1. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020617 \
|
|
&& (!defined __s390__ || __LINUX_KERNEL_VERSION >= 0x020618)
|
|
# define __ASSUME_FALLOCATE 1
|
|
#endif
|
|
|
|
/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
|
|
x86-64, PPC, IA-64, SPARC< and S390 in 2.6.23. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020617 \
|
|
&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
|
|
|| defined __sparc__ || defined __s390__)
|
|
# define __ASSUME_O_CLOEXEC 1
|
|
#endif
|
|
|
|
/* From 2.6.23 onwards the value of ARG_MAX depends on the stack
|
|
size. */
|
|
#define __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL 0x020617
|
|
#if __LINUX_KERNEL_VERSION >= __LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL
|
|
# define __ASSUME_ARG_MAX_STACK_BASED 1
|
|
#endif
|
|
|
|
/* Support for ADJ_OFFSET_SS_READ was added in 2.6.24. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020618
|
|
# define __ASSUME_ADJ_OFFSET_SS_READ 1
|
|
#endif
|
|
|
|
/* Support for various CLOEXEC and NONBLOCK flags was added for x86,
|
|
x86-64, PPC, IA-64, and SPARC in 2.6.27. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061b \
|
|
&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
|
|
|| defined __sparc__ || defined __s390__)
|
|
# define __ASSUME_SOCK_CLOEXEC 1
|
|
# define __ASSUME_IN_NONBLOCK 1
|
|
# define __ASSUME_PIPE2 1
|
|
# define __ASSUME_EVENTFD2 1
|
|
# define __ASSUME_SIGNALFD4 1
|
|
# define __ASSUME_DUP3 1
|
|
#endif
|
|
|
|
/* Support for the accept4 syscall was added in 2.6.28. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061c \
|
|
&& (defined __i386__ || defined __x86_64__ || defined __powerpc__ \
|
|
|| defined __sparc__ || defined __s390__)
|
|
# define __ASSUME_ACCEPT4 1
|
|
#endif
|
|
|
|
/* Support for the FUTEX_CLOCK_REALTIME flag was added in 2.6.29. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061d
|
|
# define __ASSUME_FUTEX_CLOCK_REALTIME 1
|
|
#endif
|
|
|
|
/* Support for the AT_RANDOM auxiliary vector entry was added in 2.6.29. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061d
|
|
# define __ASSUME_AT_RANDOM 1
|
|
#endif
|
|
|
|
/* Support for preadv and pwritev was added in 2.6.30. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061e
|
|
# define __ASSUME_PREADV 1
|
|
# define __ASSUME_PWRITEV 1
|
|
#endif
|
|
|
|
/* Support for FUTEX_*_REQUEUE_PI was added in 2.6.31. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061f
|
|
# define __ASSUME_REQUEUE_PI 1
|
|
#endif
|
|
|
|
/* Support for F_GETOWN_EX was introduced in 2.6.32. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020620
|
|
# define __ASSUME_F_GETOWN_EX 1
|
|
#endif
|
|
|
|
/* Support for the recvmmsg syscall was added in 2.6.33. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020621
|
|
# define __ASSUME_RECVMMSG 1
|
|
#endif
|
|
|
|
/* Support for /proc/self/task/$tid/comm and /proc/$pid/task/$tid/comm was
|
|
added in 2.6.33. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020621
|
|
# define __ASSUME_PROC_PID_TASK_COMM 1
|
|
#endif
|
|
|
|
/* statfs fills in f_flags since 2.6.36. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020624
|
|
# define __ASSUME_STATFS_F_FLAGS 1
|
|
#endif
|
|
|
|
/* prlimit64 is available in 2.6.36. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020624
|
|
# define __ASSUME_PRLIMIT64 1
|
|
#endif
|
|
|
|
/* sendmmsg is available in 2.6.39. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x020627
|
|
# define __ASSUME_SENDMMSG 1
|
|
#endif
|
|
|
|
/* getcpu is a syscall for x86-64 since 3.1. */
|
|
#if defined __x86_64__ && __LINUX_KERNEL_VERSION >= 0x030100
|
|
# define __ASSUME_GETCPU_SYSCALL 1
|
|
#endif
|
|
|
|
/* 2.6.29 removed the XFS restricted_chown sysctl, so it is pointless looking
|
|
for it in newer kernels. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x02061d
|
|
# define __ASSUME_XFS_RESTRICTED_CHOWN 1
|
|
#endif
|