2010-03-26 20:49:55 +00:00
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/* Set flags signalling availability of kernel features based on given
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kernel version number.
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2025-01-01 18:14:45 +00:00
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Copyright (C) 2010-2025 Free Software Foundation, Inc.
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2010-03-26 20:49:55 +00:00
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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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2012-03-09 23:56:38 +00:00
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License along with the GNU C Library. If not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2010-03-26 20:49:55 +00:00
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2012-02-08 19:43:50 +00:00
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#ifndef _KERNEL_FEATURES_H
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#define _KERNEL_FEATURES_H 1
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2010-03-26 20:49:55 +00:00
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#include_next <kernel-features.h>
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2019-05-16 20:03:39 +00:00
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/* Support for statfs64 was added in 5.1. */
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#if __LINUX_KERNEL_VERSION < 0x050100
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# undef __ASSUME_STATFS64
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# define __ASSUME_STATFS64 0
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#endif
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2012-02-08 19:43:50 +00:00
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2017-03-06 14:13:03 +00:00
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#define __ASSUME_RECV_SYSCALL 1
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2017-03-12 20:23:52 +00:00
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#define __ASSUME_SEND_SYSCALL 1
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2016-11-17 20:47:00 +00:00
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2018-07-05 16:59:02 +00:00
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/* Support for the renameat2 syscall was added in 3.17. */
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#if __LINUX_KERNEL_VERSION < 0x031100
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# undef __ASSUME_RENAMEAT2
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#endif
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2017-09-06 15:29:29 +00:00
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/* Support for the execveat syscall was added in 4.2. */
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#if __LINUX_KERNEL_VERSION < 0x040200
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# undef __ASSUME_EXECVEAT
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#endif
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2018-07-24 19:03:04 +00:00
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/* Support for copy_file_range, statx was added in kernel 4.13. */
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2018-07-10 14:14:45 +00:00
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#if __LINUX_KERNEL_VERSION < 0x040D00
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2018-07-24 19:03:04 +00:00
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# undef __ASSUME_MLOCK2
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2018-07-10 14:14:45 +00:00
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# undef __ASSUME_STATX
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#endif
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2019-05-15 18:20:58 +00:00
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/* Alpha requires old sysvipc even being a 64-bit architecture. */
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#undef __ASSUME_SYSVIPC_DEFAULT_IPC_64
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2023-08-24 16:42:16 +00:00
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/* Alpha does not provide clone3. */
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#undef __ASSUME_CLONE3
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#define __ASSUME_CLONE3 0
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linux: implement arbitrary and split speeds in termios
Linux has supported arbitrary speeds and split speeds in the kernel
since 2008 on all platforms except Alpha (fixed in 2020), but glibc
was never updated to match. This is further complicated by POSIX uses
of macros for the cf[gs]et[io]speed interfaces, rather than plain
numbers, as it really ought to have.
On most platforms, the glibc ABI includes the c_[io]speed fields in
struct termios, but they are incorrectly used. On MIPS and SPARC, they
are entirely missing.
For backwards compatibility, the kernel will still use the legacy
speed fields unless they are set to BOTHER, and will use the legacy
output speed as the input speed if the latter is 0 (== B0). However,
the specific encoding used is visible to user space applications,
including ones other than the one running.
- SPARC and MIPS get a new struct termios, and tc[gs]etattr() is
versioned accordingly. However, the new struct termios is set to be
a strict extension of the old one, which means that cf* interfaces
other than the speed-related ones do not need versioning.
- The Bxxx constants are redefined as equivalent to their integer
values and the legacy Bxxx constants are renamed __Bxxx.
- cf[gs]et[io]speed() and cfsetspeed() are versioned accordingly.
- tcgetattr() and cfset[io]speed() are adjusted to always keep the
c_[io]speed fields correct (unlike earlier versions), but to
canonicalize the representation to ALSO configure the legacy fields
if a valid legacy representation exists.
- tcsetattr(), too, canonicalizes the representation in this way
before passing it to the kernel, to maximize compatibility with
older applications/tools.
- The old IBAUD0 hack is removed; it is no longer necessary since
even the legacy c_cflag baud rate fields have had separate input
values for a long time.
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2025-06-12 01:35:36 +00:00
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/* Alpha did not provide BOTHER, CIBAUD or the termios2 ioctls until
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kernel 4.20. Even though struct __kernel_termios and struct
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termios2 are the same on Alpha, Calling the legacy TCSETS* ioctls
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with BOTHER set triggers a bug in these old kernels, so only use
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the legacy TCSETS* ioctl numbers if neither BOTHER nor split speed is
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needed; that way the code will fail gracefully. */
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#if __LINUX_KERNEL_VERSION < 0x041400
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# undef __ASSUME_TERMIOS2
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# define __ASSUME_TERMIOS2 0
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#endif
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2012-02-08 19:43:50 +00:00
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#endif /* _KERNEL_FEATURES_H */
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