glibc/sysdeps/unix/sysv/linux/kernel-features.h

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/* Set flags signalling availability of kernel features based on given
kernel version number.
Copyright (C) 1999-2022 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
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
<https://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_FEATURES_H
#define _LINUX_KERNEL_FEATURES_H 1
#include <bits/wordsize.h>
#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
2012-05-14 14:11:02 +00:00
corrected. */
/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
#define __ASSUME_STATFS64 1
Clean up kernel version conditionals for pre-2.6.32 kernels. This patch does some initial cleanup, following the move to 2.6.32 minimum kernel version, by removing __LINUX_KERNEL_VERSION conditionals that are now always-true or always-false. In the case of __ASSUME_ARG_MAX_STACK_BASED, where the conditional used a kernel version that was itself in a macro, the associated sysconf.c code is also cleaned up and __ASSUME_ARG_MAX_STACK_BASED removed completely. Tested x86_64 that disassembly of installed shared libraries is unchanged by the patch. * sysdeps/unix/sysv/linux/kernel-features.h [__s390__] (__ASSUME_UTIMES): Do not condition on kernel version. (__ASSUME_PSELECT): Define unconditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_ATFCTS): Likewise. (__ASSUME_SET_ROBUST_LIST): Do not condition on kernel version. (__ASSUME_COMPLETE_READV_WRITEV): Define unconditionally. (__ASSUME_FUTEX_LOCK_PI): Do not condition on kernel version. (__ASSUME_UTIMENSAT): Define unconditionally. (__ASSUME_PRIVATE_FUTEX): Likewise. (__ASSUME_FALLOCATE): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL): Remove. (__ASSUME_ARG_MAX_STACK_BASED): Likewise. (__ASSUME_ADJ_OFFSET_SS_READ): Define unconditionally. (__ASSUME_SOCK_CLOEXEC): Do not condition on kernel version. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. [__x86_64__ || __sparc__] (__ASSUME_ACCEPT4_SYSCALL): Likewise. (__ASSUME_FUTEX_CLOCK_REALTIME): Define unconditionally. (__ASSUME_AT_RANDOM): Likewise. (__ASSUME_PREADV): Likewise. (__ASSUME_PWRITEV): Likewise. (__ASSUME_REQUEUE_PI): Do not condition on kernel version. (__ASSUME_F_GETOWN_EX): Define unconditionally. (__ASSUME_XFS_RESTRICTED_CHOWN): Likewise. * sysdeps/unix/sysv/linux/sysconf.c (__sysconf) [!__ASSUME_ARG_MAX_STACK_BASED]: Remove conditional code. * sysdeps/unix/sysv/linux/alpha/kernel-features.h (__ASSUME_O_CLOEXEC): Define unconditionally. (__ASSUME_PSELECT): Do not undefine conditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_ATFCTS): Likewise. (__ASSUME_SET_ROBUST_LIST): Likewise. (__ASSUME_UTIMENSAT): Likewise. (__ASSUME_FDATASYNC): Define unconditionally. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_SIGFRAME_V2): Likewise. )__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_PSELECT): Do not undefine conditionally. (__ASSUME_PPOLL): Likewise. * sysdeps/unix/sysv/linux/ia64/kernel-features.h (__ASSUME_PSELECT): Define unconditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/mips/kernel-features.h (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_ACCEPT4_SYSCALL): Likewise.
2014-05-12 22:48:25 +00:00
/* pselect/ppoll were introduced just after 2.6.16-rc1. On x86_64 and
SH this appeared first in 2.6.19-rc1, on ia64 in 2.6.22-rc1. */
#define __ASSUME_PSELECT 1
Correct robust mutex / PI futex kernel assumptions (bug 9894). This patch continues fixing __ASSUME_* issues in preparation for moving to a 2.6.32 minimum kernel version by addressing assumptions on robust mutex and PI futex support availability. Those assumptions are bug 9894, but to be clear this patch does not address all the issues from that bug about wrong version assumptions, only those still applicable for --enable-kernel=2.6.32 or later (with the expectation that the move to that minimum kernel will obsolete the other parts of the bug). The patch is independent of <https://sourceware.org/ml/libc-alpha/2014-03/msg00585.html>, my other pending-review patch preparing for the kernel version change; the two together complete all the changes I believe are needed in preparation regarding any macro in sysdeps/unix/sysv/linux/kernel-features.h that would be affected by such a change. (I have not checked the correctness of macros whose conditions are unaffected by such a change, or macros only defined in other kernel-features.h files.) As discussed in that bug, robust mutexes and PI futexes need futex_atomic_cmpxchg_inatomic to be implemented, in addition to certain syscalls needed for robust mutexes (and architecture-independent kernel pieces for all the features in question). That is, as I understand it, they need futex_atomic_cmpxchg_inatomic to *work* (not return an ENOSYS error). The issues identified in my analysis relate to ARM, M68K, MicroBlaze, MIPS and SPARC. On ARM, whether futex_atomic_cmpxchg_inatomic works depends on the kernel configuration. As of 3.13, the condition for *not* working is CONFIG_CPU_USE_DOMAINS && CONFIG_SMP. As of 2.6.32 it was simply CONFIG_SMP that meant the feature was not implemented. I don't know if there are any circumstances in which we can say "we can assume a userspace glibc binary built with these options will never run on a kernel with the problematic configuration", but at least for now I'm just undefining the relevant __ASSUME_* macros for ARM. On M68K, two of the three macros are undefined for kernels before 3.10, but as far as I can see __ASSUME_FUTEX_LOCK_PI is in the same group needing futex_atomic_cmpxchg_inatomic support and so should be undefined as well. On MicroBlaze the required support was added in 2.6.33. On MIPS, the support depends on cpu_has_llsc in the kernel - that is, actual hardware LL/SC support (GCC and glibc for MIPS GNU/Linux rely on the instructions being supported in some way, but it may be kernel emulation; futex_atomic_cmpxchg_inatomic doesn't work with that emulation). The same condition as in GCC for indicating LL/SC support may not be available is used for undefining the macros in glibc, __mips == 1 || defined _MIPS_ARCH_R5900. (Maybe we could in fact desupport MIPS processors without the hardware support in glibc.) On SPARC, 32-bit kernels don't support futex_atomic_cmpxchg_inatomic; __arch64__ || __sparc_v9__ is used as the condition for binaries that won't run on 32-bit kernels. This patch is not tested beyond the sanity check of an x86_64 build. [BZ #9894] * sysdeps/unix/sysv/linux/kernel-features.h [__sparc__ && !__arch64__ && !__sparc_v9__] (__ASSUME_SET_ROBUST_LIST): Do not define. [__sparc__ && !__arch64__ && !__sparc_v9__] (__ASSUME_FUTEX_LOCK_PI): Likewise. [__sparc__ && !__arch64__ && !__sparc_v9__] (__ASSUME_REQUEUE_PI): Likewise. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_FUTEX_LOCK_PI): Undefine. (__ASSUME_REQUEUE_PI): Likewise. (__ASSUME_SET_ROBUST_LIST): Likewise. * sysdeps/unix/sysv/linux/m68k/kernel-features.h [__LINUX_KERNEL_VERSION < 0x030a00] (__ASSUME_FUTEX_LOCK_PI): Undefine. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h [__LINUX_KERNEL_VERSION < 0x020621] (__ASSUME_FUTEX_LOCK_PI): Likewise. [__LINUX_KERNEL_VERSION < 0x020621] (__ASSUME_REQUEUE_PI): Likewise. [__LINUX_KERNEL_VERSION < 0x020621] (__ASSUME_SET_ROBUST_LIST): Likewise. * sysdeps/unix/sysv/linux/mips/kernel-features.h [__mips == 1 || _MIPS_ARCH_R5900] (__ASSUME_FUTEX_LOCK_PI): Undefine. [__mips == 1 || _MIPS_ARCH_R5900] (__ASSUME_REQUEUE_PI): Likewise. [__mips == 1 || _MIPS_ARCH_R5900] (__ASSUME_SET_ROBUST_LIST): Likewise.
2014-03-31 12:55:18 +00:00
/* Support for inter-process robust mutexes was added in 2.6.17 (but
some architectures lack futex_atomic_cmpxchg_inatomic in some
configurations). */
#define __ASSUME_SET_ROBUST_LIST 1
Reduce kernel-features.h duplication. This patch reduces duplication between different architectures' kernel-features.h files by making the architecture-independent file define various macros unconditionally (instead of only for a particular list of architectures), with the architecture-specific files then undefining the macros if necessary. Specifically, __ASSUME_O_CLOEXEC (O_CLOEXEC flag to open) and __ASSUME_SOCK_CLOEXEC (SOCK_NONBLOCK and SOCK_CLOEXEC flags to socket) are supported on all architectures as of 2.6.32 or the minimum kernel version for the architecture if later. For __ASSUME_IN_NONBLOCK, __ASSUME_PIPE2, __ASSUME_EVENTFD2, __ASSUME_SIGNALFD4 and __ASSUME_DUP3, the relevant syscalls were added for alpha in 2.6.33 but otherwise the features are available as of 2.6.32. For __ASSUME_UTIMES, support is everywhere in 2.6.32 except for asm-generic architectures and hppa. Although those were the main cases of duplication among kernel-features.h files, some other cases of unnecessary definitions were also cleaned up: the hppa file defined various macros that were either no longer used at all, or defined by the main file by default anyway, the ia64 file had duplicative definitions of __ASSUME_PSELECT and __ASSUME_PPOLL, while mips had such a definition of __ASSUME_IPC64. Really, rather than being defined in the main file then undefined for asm-generic architectures, __ASSUME_UTIMES should become an hppa-specific macro. Given that __ASSUME_ATFCTS and __ASSUME_UTIMENSAT are now always true, the only live __ASSUME_UTIMES conditional is in sysdeps/unix/sysv/linux/utimes.c, which is not used for asm-generic architectures. I think the desired state would be an hppa-specific file (that includes sysdeps/unix/sysv/linux/utimes.c if __ASSUME_UTIMES, and otherwise has fallback code), with the fallback code being removed from the main utimes.c. But I think that's most reasonably a separate cleanup once __ASSUME_ATFCTS and __ASSUME_UTIMESAT have both had conditional code cleaned up. Given this patch, I think it's straightforward to move non-ex-ports architectures to having their own kernel-features.h files, like ex-ports architectures, rather than conditionals in the main file (i.e., such a move won't require the architecture-specific file to contain anything that isn't genuinely architecture-specific), and would encourage architecture maintainers to do so. Tested x86_64 that the installed shared libraries are unchanged by this patch. Note that on some architectures this *will* cause __ASSUME_* macros to be defined in cases where they weren't previously but should have been (but this is just optimization, not a fix to a user-visible bug, so doesn't need a bug report in Bugzilla). * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_UTIMES): Define unconditionally. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/aarch64/kernel-features.h (__ASSUME_DUP3): Do not define. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_UTIMES): Undefine. * sysdeps/unix/sysv/linux/alpha/kernel-features.h (__ASSUME_UTIMES): Do not define. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Undefine if [__LINUX_KERNEL_VERSION < 0x020621] instead of defining if [__LINUX_KERNEL_VERSION >= 0x020621]. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. [__LINUX_KERNEL_VERSION < 0x020621] (__ASSUME_DUP3): Undefine. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_UTIMES): Do not define. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. * sysdeps/unix/sysv/linux/hppa/kernel-features.h (__ASSUME_32BITUIDS): Likewise. (__ASSUME_TRUNCATE64_SYSCALL): Likewise. (__ASSUME_IPC64): Likewise. (__ASSUME_ST_INO_64_BIT): Likewise. (__ASSUME_GETDENTS64_SYSCALL): Likewise. [__LINUX_KERNEL_VERSION < 0x030e00] (__ASSUME_UTIMES): Undefine. * sysdeps/unix/sysv/linux/ia64/kernel-features.h (__ASSUME_UTIMES): Do not define. (__ASSUME_PSELECT): Likewise. (__ASSUME_PPOLL): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_UTIMES): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_UTIMES): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/mips/kernel-features.h (__ASSUME_IPC64): Likewise. (__ASSUME_UTIMES): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. * sysdeps/unix/sysv/linux/tile/kernel-features.h (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. (__ASSUME_UTIMES): Undefine.
2014-05-14 00:45:19 +00:00
/* Support for various CLOEXEC and NONBLOCK flags was added in
2.6.27. */
#define __ASSUME_IN_NONBLOCK 1
/* Support for preadv and pwritev was added in 2.6.30. */
Clean up kernel version conditionals for pre-2.6.32 kernels. This patch does some initial cleanup, following the move to 2.6.32 minimum kernel version, by removing __LINUX_KERNEL_VERSION conditionals that are now always-true or always-false. In the case of __ASSUME_ARG_MAX_STACK_BASED, where the conditional used a kernel version that was itself in a macro, the associated sysconf.c code is also cleaned up and __ASSUME_ARG_MAX_STACK_BASED removed completely. Tested x86_64 that disassembly of installed shared libraries is unchanged by the patch. * sysdeps/unix/sysv/linux/kernel-features.h [__s390__] (__ASSUME_UTIMES): Do not condition on kernel version. (__ASSUME_PSELECT): Define unconditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_ATFCTS): Likewise. (__ASSUME_SET_ROBUST_LIST): Do not condition on kernel version. (__ASSUME_COMPLETE_READV_WRITEV): Define unconditionally. (__ASSUME_FUTEX_LOCK_PI): Do not condition on kernel version. (__ASSUME_UTIMENSAT): Define unconditionally. (__ASSUME_PRIVATE_FUTEX): Likewise. (__ASSUME_FALLOCATE): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__LINUX_ARG_MAX_STACK_BASED_MIN_KERNEL): Remove. (__ASSUME_ARG_MAX_STACK_BASED): Likewise. (__ASSUME_ADJ_OFFSET_SS_READ): Define unconditionally. (__ASSUME_SOCK_CLOEXEC): Do not condition on kernel version. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. [__x86_64__ || __sparc__] (__ASSUME_ACCEPT4_SYSCALL): Likewise. (__ASSUME_FUTEX_CLOCK_REALTIME): Define unconditionally. (__ASSUME_AT_RANDOM): Likewise. (__ASSUME_PREADV): Likewise. (__ASSUME_PWRITEV): Likewise. (__ASSUME_REQUEUE_PI): Do not condition on kernel version. (__ASSUME_F_GETOWN_EX): Define unconditionally. (__ASSUME_XFS_RESTRICTED_CHOWN): Likewise. * sysdeps/unix/sysv/linux/sysconf.c (__sysconf) [!__ASSUME_ARG_MAX_STACK_BASED]: Remove conditional code. * sysdeps/unix/sysv/linux/alpha/kernel-features.h (__ASSUME_O_CLOEXEC): Define unconditionally. (__ASSUME_PSELECT): Do not undefine conditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_ATFCTS): Likewise. (__ASSUME_SET_ROBUST_LIST): Likewise. (__ASSUME_UTIMENSAT): Likewise. (__ASSUME_FDATASYNC): Define unconditionally. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_SIGFRAME_V2): Likewise. )__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_PSELECT): Do not undefine conditionally. (__ASSUME_PPOLL): Likewise. * sysdeps/unix/sysv/linux/ia64/kernel-features.h (__ASSUME_PSELECT): Define unconditionally. (__ASSUME_PPOLL): Likewise. (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_O_CLOEXEC): Likewise. (__ASSUME_SOCK_CLOEXEC): Likewise. (__ASSUME_IN_NONBLOCK): Likewise. (__ASSUME_PIPE2): Likewise. (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_DUP3): Likewise. * sysdeps/unix/sysv/linux/mips/kernel-features.h (__ASSUME_EVENTFD2): Likewise. (__ASSUME_SIGNALFD4): Likewise. (__ASSUME_ACCEPT4_SYSCALL): Likewise.
2014-05-12 22:48:25 +00:00
#define __ASSUME_PREADV 1
#define __ASSUME_PWRITEV 1
Simplify accept4, recvmmsg, sendmmsg code. The accept4, recvmmsg and sendmmsg functions had macros __ASSUME_*_SYSCALL_WITH_SOCKETCALL. Before we could assume kernels with the relevant functionality, these macros represented the conditions under which, on a socketcall architecture, glibc could just call the syscall unconditionally and not have to deal with socketcall at all for those functions, because if the syscall didn't work for them the socketcall call wouldn't either. Now we can assume kernels with the relevant functionality, the only question is whether we can assume the syscall is present; if not, we are on a socketcall architecture and just use socketcall instead. Thus, this patch removes the macros that are no longer necessary, and simplifies the code for accept4, recvmmsg and sendmmsg to use the same logic as the other C implementations of socket functions that may use a syscall or socketcall depending on kernel support. Tested for x86_64 and x86. * sysdeps/unix/sysv/linux/accept4.c (accept4): Use syscall if [__ASSUME_ACCEPT4_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/recvmmsg.c (recvmmsg): Use syscall if [__ASSUME_RECVMMSG_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/sendmmsg.c (__sendmmsg): Use syscall if [__ASSUME_SENDMMSG_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_ACCEPT4_SYSCALL): Move to general list of macros for socket syscalls. (__ASSUME_RECVMMSG_SYSCALL): Likewise. (__ASSUME_SENDMMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Remove. (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Remove. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL): Likewise. (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise.
2017-05-09 21:59:36 +00:00
/* Support for sendmmsg functionality was added in 3.0. */
#define __ASSUME_SENDMMSG 1
Adjust kernel-features.h defaults for recvmsg and sendmsg This patch removes the auto-generation for recvmsg and sendmsg syscall and adjust the kernel-features.h for all architectures supported on Linux. This patch follows the idea of 'Adjust kernel-features.h defaults for socket syscalls.' (35ade9f11b9007ee9683529f2d33698ff35255c8) by define __ASSUME_SENDMSG_SYSCALL and __ASSUME_RECVMSG_SYSCALL as supported by default and undefine it for the architecture that do not support it directly. The main rationale is to make is easier add code wrapper over the syscall to fix BZ#16919 (recvmsg standard compliance). Tested on x86_64, i686, aarch64, armhf, and powerpc64le. * sysdeps/unix/sysv/linux/alpha/syscalls.list (recvmsg): Remove from auto-generation. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/arm/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list (recvmsg): Likewise. (sendmsg): Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_SENDMSG_SYSCALL): Remove. [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_SENDMSG_SYSCALL): Undefine. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_SENDMSG_SYSCALL): Define. (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/m68k/kernel-features.h [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_SENDMSG_SYSCALL): Remove. [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_SENDMSG_SYSCALL): Undefine. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_SENDMSG_SYSCALL): Remove. [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_SENDMSG_SYSCALL): Undefine. [__LINUX_KERNEL_VERSION < 0x040300] (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_SENDMSG_SYSCALL): Undefine. (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_SENDMSG_SYSCALL): Likewise. (__ASSUME_RECVMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_SENDMSG_SYSCALL): Likewise. (__ASSUME_RECVMSG_SYSCALL): Likewise.
2016-03-15 20:42:26 +00:00
/* On most architectures, most socket syscalls are supported for all
supported kernel versions, but on some socketcall architectures
separate syscalls were only added later. */
#define __ASSUME_SENDMSG_SYSCALL 1
#define __ASSUME_RECVMSG_SYSCALL 1
Consolidate Linux accept implementation This patch consolidates the accept Linux syscall implementation on sysdeps/unix/sysv/linux/accept.c. The changes are: 1. Remove accept from auto-generation syscalls.list on the architecture that uses __NR_accept. 2. Define __NR_accept as default (__ASSUME_ACCEPT_SYSCALL) and undef for architectures that do not support it. 3. Remove __ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL and decide to use __NR_accept4 for accept generation based on __ASSUME_ACCEPT4_SYSCALL. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * sysdeps/unix/sysv/linux/accept.c (__libc_accept): Replace __ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL by __ASSUME_ACCEPT4_SYSCALL. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove accept from auto-generation list. * sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL): Remove define. (__ASSUME_ACCEPT_SYSCALL): Undefine. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_ACCEPT_SYSCALL): New define. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL): Remove define. (__ASSUME_ACCEPT_SYSCALL): Define wheter kernel version supports. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_ACCEPT_SYSCALL): Define. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_ACCEPT_SYSCALL): Undefine. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL): Remove define. (__ASSUME_ACCEPT_SYSCALL): Undefine. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_ACCEPT_SYSCALL): Undefine. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_ACCEPT_SYSCALL): Undefine for 32 bits.
2016-11-17 20:13:44 +00:00
#define __ASSUME_ACCEPT_SYSCALL 1
Consolidate Linux connect implementation This patch consolidates the connect Linux syscall implementation on sysdeps/unix/sysv/linux/accept.c. The changes are: 1. Remove connect from auto-generation syscalls.list on the architecture that uses __NR_connect. 2. Define __NR_connect as default (__ASSUME_CONNECT_SYSCALL) and undef for architectures that do not support it. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove connect from auto-generation list. * sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/connect.c: Simplify include list. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_CONNECT_SYSCALL): Define. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_CONNECT_SYSCALL): Undef if kernel does not support it. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_CONNECT_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_CONNECT_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_CONNECT_SYSCALL): Likewise.
2016-11-17 20:15:52 +00:00
#define __ASSUME_CONNECT_SYSCALL 1
Consolidate Linux recvfrom implementation This patch consolidates the recvfrom Linux syscall implementation on sysdeps/unix/sysv/linux/recvfrom.c. The changes are: 1. Define __ASSUME_RECVFROM_SYSCALL by default 2. Undef it for architectures that do not support __NR_recvfrom. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove recvfrom from auto-generation list. * sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Define by default. (__ASSUME_RECVFROM_SYSCALL): Undef it if kernel does not support __NR_recvfrom. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Remove definition. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_RECVFROM_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/recvfrom.c: Simplify includes.
2017-03-06 11:53:14 +00:00
#define __ASSUME_RECVFROM_SYSCALL 1
Consolidate Linux sendto implementation This patch consolidates the sendto Linux syscall implementation on sysdeps/unix/sysv/linux/sendto.c. The changes are: 1. Define __ASSUME_SENDTO_SYSCALL by default. 2. Undef it for architectures that do not support __NR_sendto. Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * sysdeps/unix/sysv/linux/alpha/syscalls.list: Remove sendto from auto-generation list. * sysdeps/unix/sysv/linux/arm/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/generic/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/hppa/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/x86_64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Define by default. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Undef it is kernel does not support __NR_sendto. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Remove definition. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_SENDTO_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h: (__ASSUME_SENDTO_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sendto.c: Simplify includes.
2017-03-06 13:51:51 +00:00
#define __ASSUME_SENDTO_SYSCALL 1
Simplify accept4, recvmmsg, sendmmsg code. The accept4, recvmmsg and sendmmsg functions had macros __ASSUME_*_SYSCALL_WITH_SOCKETCALL. Before we could assume kernels with the relevant functionality, these macros represented the conditions under which, on a socketcall architecture, glibc could just call the syscall unconditionally and not have to deal with socketcall at all for those functions, because if the syscall didn't work for them the socketcall call wouldn't either. Now we can assume kernels with the relevant functionality, the only question is whether we can assume the syscall is present; if not, we are on a socketcall architecture and just use socketcall instead. Thus, this patch removes the macros that are no longer necessary, and simplifies the code for accept4, recvmmsg and sendmmsg to use the same logic as the other C implementations of socket functions that may use a syscall or socketcall depending on kernel support. Tested for x86_64 and x86. * sysdeps/unix/sysv/linux/accept4.c (accept4): Use syscall if [__ASSUME_ACCEPT4_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/recvmmsg.c (recvmmsg): Use syscall if [__ASSUME_RECVMMSG_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/sendmmsg.c (__sendmmsg): Use syscall if [__ASSUME_SENDMMSG_SYSCALL], otherwise socketcall. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_ACCEPT4_SYSCALL): Move to general list of macros for socket syscalls. (__ASSUME_RECVMMSG_SYSCALL): Likewise. (__ASSUME_SENDMMSG_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Remove. (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Remove. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL): Likewise. (__ASSUME_RECVMMSG_SYSCALL_WITH_SOCKETCALL): Likewise. (__ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL): Likewise.
2017-05-09 21:59:36 +00:00
#define __ASSUME_ACCEPT4_SYSCALL 1
#define __ASSUME_RECVMMSG_SYSCALL 1
#define __ASSUME_SENDMMSG_SYSCALL 1
#define __ASSUME_GETSOCKOPT_SYSCALL 1
#define __ASSUME_SETSOCKOPT_SYSCALL 1
Add __ASSUME_DIRECT_SYSVIPC_SYSCALL for Linux On current minimum supported kernels, the SysV IPC on Linux is provided by either the ipc syscalls or correspondent wire syscalls. Also, for architectures that supports wire syscalls all syscalls are supported in a set (msgct, msgrcv, msgsnd, msgget, semctl, semget, semop, semtimedop, shmctl, shmat, shmget, shmdt). The architectures that only supports ipc syscall are: - i386, m68k, microblaze, mips32, powerpc (powerpc32, powerpc64, and powerpc64le), s390 (32 and 64 bits), sh, sparc32, and sparc64. And the architectures that only supports wired syscalls are: - aarch64, alpha, hppa, ia64, mips64, mips64n32, nios2, tile (tilepro, tilegx, and tilegx64), and x86_64 Also arm is the only one that supports both wire syscalls and the ipc, although the ipc one is deprecated. This patch adds a new define, __ASSUME_DIRECT_SYSVIPC_SYSCALL, that wired syscalls are supported on the system and the general idea is to use it where possible. I also checked the syscall table for all architectures on Linux 4.9 and there is no change on described support for Linux 2.6.32/3.2. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): New define. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Undef. * sysdeps/unix/sysv/linux/m68k/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/mips/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise. * sysdeps/unix/sysv/linux/sparc/kernel-features.h (__ASSUME_DIRECT_SYSVIPC_SYSCALL): Likewise.
2016-11-02 17:41:15 +00:00
/* Support for SysV IPC through wired syscalls. All supported architectures
either support ipc syscall and/or all the ipc correspondent syscalls. */
#define __ASSUME_DIRECT_SYSVIPC_SYSCALLS 1
/* The generic default __IPC_64 value is 0x0, however some architectures
require a different value of 0x100. */
#define __ASSUME_SYSVIPC_DEFAULT_IPC_64 1
posix: Implement preadv2 and pwritev2 This patch adds support of preadv2 and pwritev2 which are similar to preadv/pwritev but with an extra flag argument. As for preadv/pwritev both interfaces are added a non-standard GNU API. For default 'posix' implementation trying to emulate the Linux supported flags is troublesome: * We can not temporary change the file state of the O_DSYNC and O_SYNC flags to emulate RWF_{D}SYNC (attempts to change the state of using fcntl are silently ignored). * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal semantic not provided by any other flag (O_NONBLOCK for instance). So default sysdeps/posix implementations fails with EOPNOTSUPP for any non supported flag (which are none currently) calls generic preadv/pwritev. Basically this implementation supports only preadv2 called as preadv (with flags sets to 0). The Linux one uses the preadv2/pwritev2 syscall if defined, otherwise it call preadv/writev. Instead of using the previous __ASSUME_* to unconditionally issue the syscall (and avoid building the fallback routine), it call pread/write if the preadv2/pwritev2 syscalls fails. The idea is just avoid adding another __ASSUME_* and checking each architecture on every kernel bump and simplify code conditionals. Checked on x86_64-linux-gnu and on i686-linux-gnu and a check with run-built-tests=no on aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabihf, ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu, mips{64,64n32}-linux-gnu, nios2-linux-gnu, powerpc{64,64le}-linux-gnu, s390{x}-linux-gnu, sparc{64,v9}-linux-gnu, tile{gx,pro}-linux-gnu, and sh4-linux-gnu (all using gcc 6.3). * NEWS: Add note about pwritev2 and preadv2 inclusion. * misc/Makefile (routines): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. (tests): Add tst-preadvwritev2 and tst-preadvwritev64v2. * misc/Versions (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. * misc/preadv2.c: New file. * misc/preadv64v2.c: Likewise. * misc/pwritev2.c: Likewise. * misc/pwritev64v2.c: Likewise. * misc/tst-preadvwritev2.c: Likewise. * misc/tst-preadvwritev64v2.c: Likewise. * manual/llio.texi: Add preadv2 and pwritev2 documentation. * misc/sys/uio.h [__USE_GNU && !__USE_FILE_OFFSET64] (preadv2): New prototype. [__USE_GNU && !__USE_FILE_OFFSET64] (pwritev2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (preadv64v2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (pwritev64v2): Likewise. * misc/tst-preadvwritev-common.c (PREADV): Define if not defined. (PWRITEV): Likewise. (do_test_with_offset): Use PREADV and PWRITEV macros and check for ENOSYS. * nptl/tst-cancel4.c (tf_pwritev2): New test. (tf_preadv2): Likewise. (tf_fsync): Add tf_pwritev2 and tf_preadv2. * sysdeps/posix/preadv2.c: Likewise. * sysdeps/posix/preadv64v2.c: Likewise. * sysdeps/posix/pwritev2.c: Likewise. * sysdeps/posix/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/kernel-features.h: Add comment for syscall support in kernel. * sysdeps/unix/sysv/linux/preadv2.c: Likewise. * sysdeps/unix/sysv/linux/preadv64v2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/preadv.c (preadv): Add libc_hidden_def. * sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise. * sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise. * sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise. * sysdeps/unix/sysv/linux/bits/uio.h: Add supported preadv2/pwritev2 support flags on Linux. * sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, pwritev64v2. * sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.26): Likewise.
2017-04-25 19:43:27 +00:00
sysvipc: Set ipc_perm mode as mode_t (BZ#18231) This patch sets the mode field in ipc_perm as mode_t for all architectures, as POSIX specification [1]. The changes required are as follow: 1. It moves the ipc_perm definition out of ipc.h to its own header ipc_perm.h. It also allows consolidate the IPC_* definition on only one header. 2. The generic implementation follow the kernel ipc64_perm size so the syscall can be made directly without temporary buffer copy. However, since glibc defines the MODE field as mode_t, it omits the __PAD1 field (since glibc does not export mode_t as 16-bit for any architecture). It is a two-fold improvement: 2.1. New implementation which follow Linux UAPI will not need to provide an arch-specific ipc-perm.h header neither wrongly use the wrong 16-bit definition from previous default ipc.h (as csky did). 2.1. It allows consolidate ipc_perm definition for architectures that already provide mode_t as 32-bit. 3. All kernel ABIs for the supported architectures already provides the expected padding for mode type extension to 32-bit. However, some architectures the padding has the wrong placement, so it requires the ipc control routines (msgctl, semctl, and shmctl) to adjust the mode field accordingly. Currently they are armeb, microblaze, m68k, s390, and sheb. A new assume is added, __ASSUME_SYSVIPC_BROKEN_MODE_T, which the required ABIs define. 4. For the ABIs that define __ASSUME_SYSVIPC_BROKEN_MODE_T, it also require compat symbols that do not adjust the mode field. Checked on arm-linux-gnueabihf, aarch64-linux-gnu, powerpc64le-linux-gnu, and x86_64-linux-gnu. I also checked the sysvipc tests on hppa-linux-gnu, sh4-linux-gnu, s390x-linux-gnu, and s390-linux-gnu. I also did a sanity test against armeb qemu usermode for the sysvipc tests. [BZ #18231] * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add bits/ipc-perm.h. * sysdeps/unix/sysv/linux/aarch64/bits/ipc.h: Remove file. * sysdeps/unix/sysv/linux/alpha/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/hppa/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/ia64/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/mips/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/s390/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/sparc/bits/ipc.h: Likewise. * sysdeps/unix/sysv/linux/arm/kernel-features.h [__BYTE_ORDER == __BIG_ENDIAN] (__ASSUME_SYSVIPC_BROKEN_MODE_T): Define. * sysdeps/sysv/linux/microblaze/kernel-features.h: Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h [!__s390x__] (__ASSUME_SYSVIPC_BROKEN_MODE_T): Define. * sysdeps/unix/sysv/linux/sh/kernel-features.h (__ASSUME_SYSVIPC_BROKEN_MODE_T): Define. * sysdeps/unix/sysv/linux/m68k/kernel-features.h: Likewise. * sysdeps/unix/sysv/linux/bits/ipc-perm.h: New file. * sysdeps/unix/sysv/linux/powerpc/bits/ipc-perm.h: Likewise. * sysdeps/unix/sysv/linux/sparc/bits/ipc-perm.h: Likewise. * sysdeps/unix/sysv/linux/bits/ipc.h (ipc_perm): Move to bits/ipc-perm.h. * sysdeps/unix/sysv/linux/hppa/bits/ipc-perm.h: New file. * sysdeps/unix/sysv/linux/kernel-features.h: Add comment about __ASSUME_SYSVIPC_BROKEN_MODE_T semantic. * sysdeps/unix/sysv/linux/msgctl.c (DEFAULT_VERSION): Define as 2.31 if __ASSUME_SYSVIPC_BROKEN_MODE_T is defined. (msgctl_syscall, __msgctl_mode16): New symbol. (__new_msgctl): Add bits for __ASSUME_SYSVIPC_BROKEN_MODE_T. * sysdeps/unix/sysv/linux/semctl.c: Likewise. * sysdeps/unix/sysv/linux/shmctl.c: Likewise. * sysdeps/unix/sysv/linux/arm/be/libc.abilist (GLIBC_2.31): Add msgctl, semctl, and shmctl. * sysdeps/sysv/linux/microblaze/be/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise. * sysdeps/unix/sysv/linux/sh/be/libc.abilist: Likewise. * conform/data/sys/ipc.h-data: Only xfail {struct ipc_perm} mode_t mode for Hurd. * sysdeps/unix/sysv/linux/m68k/Versions (libc) [GLIBC_2.31]: Add msgctl, semctl, and shmctl. * sysdeps/unix/sysv/linux/arm/be/Versions: New file. * sysdeps/unix/sysv/linux/microblaze/be/Versions: Likewise. * sysdeps/unix/sysv/linux/sh/be/Versions: Likewise. [1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_ipc.h.html
2019-10-10 18:13:11 +00:00
/* All supported architectures reserve a 32-bit for MODE field in sysvipc
ipc_perm. However, some kernel ABI interfaces still expect a 16-bit
field. This is only an issue if arch-defined IPC_PERM padding is on a
wrong position regarding endianness. In this case, the IPC control
routines (msgctl, semctl, and semtctl) requires to shift the value to
correct place.
The ABIs that requires it define __ASSUME_SYSVIPC_BROKEN_MODE_T. */
posix: Implement preadv2 and pwritev2 This patch adds support of preadv2 and pwritev2 which are similar to preadv/pwritev but with an extra flag argument. As for preadv/pwritev both interfaces are added a non-standard GNU API. For default 'posix' implementation trying to emulate the Linux supported flags is troublesome: * We can not temporary change the file state of the O_DSYNC and O_SYNC flags to emulate RWF_{D}SYNC (attempts to change the state of using fcntl are silently ignored). * IOCB_HIPRI requires the file opened in O_DIRECT and uses an internal semantic not provided by any other flag (O_NONBLOCK for instance). So default sysdeps/posix implementations fails with EOPNOTSUPP for any non supported flag (which are none currently) calls generic preadv/pwritev. Basically this implementation supports only preadv2 called as preadv (with flags sets to 0). The Linux one uses the preadv2/pwritev2 syscall if defined, otherwise it call preadv/writev. Instead of using the previous __ASSUME_* to unconditionally issue the syscall (and avoid building the fallback routine), it call pread/write if the preadv2/pwritev2 syscalls fails. The idea is just avoid adding another __ASSUME_* and checking each architecture on every kernel bump and simplify code conditionals. Checked on x86_64-linux-gnu and on i686-linux-gnu and a check with run-built-tests=no on aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabihf, ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu, mips{64,64n32}-linux-gnu, nios2-linux-gnu, powerpc{64,64le}-linux-gnu, s390{x}-linux-gnu, sparc{64,v9}-linux-gnu, tile{gx,pro}-linux-gnu, and sh4-linux-gnu (all using gcc 6.3). * NEWS: Add note about pwritev2 and preadv2 inclusion. * misc/Makefile (routines): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. (tests): Add tst-preadvwritev2 and tst-preadvwritev64v2. * misc/Versions (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, and pwritev64v2. * misc/preadv2.c: New file. * misc/preadv64v2.c: Likewise. * misc/pwritev2.c: Likewise. * misc/pwritev64v2.c: Likewise. * misc/tst-preadvwritev2.c: Likewise. * misc/tst-preadvwritev64v2.c: Likewise. * manual/llio.texi: Add preadv2 and pwritev2 documentation. * misc/sys/uio.h [__USE_GNU && !__USE_FILE_OFFSET64] (preadv2): New prototype. [__USE_GNU && !__USE_FILE_OFFSET64] (pwritev2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (preadv64v2): Likewise. [__USE_GNU && __USE_FILE_OFFSET64] (pwritev64v2): Likewise. * misc/tst-preadvwritev-common.c (PREADV): Define if not defined. (PWRITEV): Likewise. (do_test_with_offset): Use PREADV and PWRITEV macros and check for ENOSYS. * nptl/tst-cancel4.c (tf_pwritev2): New test. (tf_preadv2): Likewise. (tf_fsync): Add tf_pwritev2 and tf_preadv2. * sysdeps/posix/preadv2.c: Likewise. * sysdeps/posix/preadv64v2.c: Likewise. * sysdeps/posix/pwritev2.c: Likewise. * sysdeps/posix/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/kernel-features.h: Add comment for syscall support in kernel. * sysdeps/unix/sysv/linux/preadv2.c: Likewise. * sysdeps/unix/sysv/linux/preadv64v2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev2.c: Likewise. * sysdeps/unix/sysv/linux/pwritev64v2.c: Likewise. * sysdeps/unix/sysv/linux/preadv.c (preadv): Add libc_hidden_def. * sysdeps/unix/sysv/linux/preadv64.c (preadv64): Likewise. * sysdeps/unix/sysv/linux/pwritev.c (pwritev): Likewise. * sysdeps/unix/sysv/linux/pwritev64.c (pwritev64): Likewise. * sysdeps/unix/sysv/linux/bits/uio.h: Add supported preadv2/pwritev2 support flags on Linux. * sysdeps/unix/sysv/linux/aarch64/libc.abilist (GLIBC_2.26): Add preadv2, preadv64v2, pwritev2, pwritev64v2. * sysdeps/unix/sysv/linux/alpha/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/arm/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/hppa/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/i386/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/ia64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/microblaze/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/nios2/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sh/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx32/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/sysv/linux/tile/tilegx/tilegx64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/64/libc.abilist (GLIBC_2.26): Likewise. * sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist (GLIBC_2.26): Likewise.
2017-04-25 19:43:27 +00:00
/* Support for p{read,write}v2 was added in 4.6. However Linux default
implementation does not assume the __ASSUME_* and instead use a fallback
implementation based on p{read,write}v and returning an error for
non supported flags. */
/* Support for the renameat2 system call was added in kernel 3.15. */
#if __LINUX_KERNEL_VERSION >= 0x030F00
# define __ASSUME_RENAMEAT2
#endif
/* Support for the execveat syscall was added in 3.19. */
#if __LINUX_KERNEL_VERSION >= 0x031300
# define __ASSUME_EXECVEAT 1
#endif
#if __LINUX_KERNEL_VERSION >= 0x040400
# define __ASSUME_MLOCK2 1
#endif
2018-07-10 14:14:45 +00:00
/* Support for statx was added in kernel 4.11. */
#if __LINUX_KERNEL_VERSION >= 0x040B00
# define __ASSUME_STATX 1
#endif
Refactor Linux ARCH_FORK implementation This patch refactors the ARCH_FORK macro and the required architecture specific header to simplify the required architecture definitions to provide the fork syscall semantic and proper document current Linux clone ABI variant. Instead of require the reimplementation of arch-fork.h header, this patch changes the ARCH_FORK to an inline function with clone ABI defined by kernel-features.h define. The generic kernel ABI meant for newer ports is used as default and redefine if the architecture requires. Checked on x86_64-linux-gnu and i686-linux-gnu. Also with a build for all the afected ABIs. * sysdeps/nptl/fork.c (ARCH_FORK): Replace by auch_fork. * sysdeps/unix/sysv/linux/alpha/arch-fork.h: Remove file. * sysdeps/unix/sysv/linux/riscv/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/aarch64/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/arm/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/hppa/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/i386/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/ia64/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/m68k/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/microblaze/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/mips/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/nios2/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/s390/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/sh/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/sparc/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/tile/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/x86_64/arch-fork.h: Likewise. * sysdeps/unix/sysv/linux/arch-fork.h (arch_fork): New function. * sysdeps/unix/sysv/linux/aarch64/kernel-features.h: New file. * sysdeps/unix/sysv/linux/riscv/kernel-features.h: Likewise. * sysdeps/unix/sysv/linux/arm/kernel-features.h (__ASSUME_CLONE_BACKWARDS): Define. * sysdeps/unix/sysv/linux/createthread.c (ARCH_CLONE): Define to __clone2 if __NR_clone2 is defined. * sysdeps/unix/sysv/linux/hppa/kernel-features.h (__ASSUME_CLONE_BACKWARDS): Likewise. * sysdeps/unix/sysv/linux/i386/kernel-features.h (__ASSUME_CLONE_BACKWARDS): Likewise. * sysdeps/unix/sysv/linux/ia64/kernel-features.h (__ASSUME_CLONE2): Likewise. * sysdeps/unix/sysv/linux/microblaze/kernel-features.h (__ASSUME_CLONE_BACKWARDS3): Likewise. * sysdeps/unix/sysv/linux/kernel-features.h: Document possible clone variants and the define architecture can use. (__ASSUME_CLONE_DEFAULT): Define as default. * sysdeps/unix/sysv/linux/mips/kernel-features.h (__ASSUME_CLONE_BACKWARDS): Likewise. * sysdeps/unix/sysv/linux/powerpc/kernel-features.h (__ASSUME_CLONE_BACKWARDS): Likewise. * sysdeps/unix/sysv/linux/s390/kernel-features.h (__ASSUME_CLONE_BACKWARDS2): Likewise.
2018-01-05 17:38:06 +00:00
/* Support for clone call used on fork. The signature varies across the
architectures with current 4 different variants:
1. long int clone (unsigned long flags, unsigned long newsp,
int *parent_tidptr, unsigned long tls,
int *child_tidptr)
2. long int clone (unsigned long newsp, unsigned long clone_flags,
int *parent_tidptr, int * child_tidptr,
unsigned long tls)
3. long int clone (unsigned long flags, unsigned long newsp,
int stack_size, int *parent_tidptr,
int *child_tidptr, unsigned long tls)
4. long int clone (unsigned long flags, unsigned long newsp,
int *parent_tidptr, int *child_tidptr,
unsigned long tls)
The fourth variant is intended to be used as the default for newer ports,
Also IA64 uses the third variant but with __NR_clone2 instead of
__NR_clone.
The macros names to define the variant used for the architecture is
similar to kernel:
- __ASSUME_CLONE_BACKWARDS: for variant 1.
- __ASSUME_CLONE_BACKWARDS2: for variant 2 (s390).
- __ASSUME_CLONE_BACKWARDS3: for variant 3 (microblaze).
- __ASSUME_CLONE_DEFAULT: for variant 4.
- __ASSUME_CLONE2: for clone2 with variant 3 (ia64).
*/
#define __ASSUME_CLONE_DEFAULT 1
/* Support for 64-bit time_t in the system call interface. When this
flag is set, the kernel provides a version of each of these system
calls that accepts 64-bit time_t:
clock_adjtime(64)
clock_gettime(64)
clock_settime(64)
clock_getres(_time64)
clock_nanosleep(_time64)
futex(_time64)
mq_timedreceive(_time64)
mq_timedsend(_time64)
ppoll(_time64)
pselect6(_time64)
rt_sigtimedwait(_time64)
sched_rr_get_interval(_time64)
timer_gettime(64)
timer_settime(64)
timerfd_gettime(64)
timerfd_settime(64)
utimensat(_time64)
On architectures where time_t has historically been 64 bits,
only the 64-bit version of each system call exists, and there
are no suffixes on the __NR_ constants.
On architectures where time_t has historically been 32 bits,
both 32-bit and 64-bit versions of each system call may exist,
depending on the kernel version. When the 64-bit version exists,
there is a '64' or '_time64' suffix on the name of its __NR_
constant, as shown above.
This flag is always set for Linux 5.1 and later. Prior to that
version, it is set only for some CPU architectures and ABIs:
- __WORDSIZE == 64 - all supported architectures where pointers
are 64 bits also have always had 64-bit time_t.
- __WORDSIZE == 32 && __SYSCALL_WORDSIZE == 64 - this describes
only one supported configuration, x86's 'x32' subarchitecture,
where pointers are 32 bits but time_t has always been 64 bits.
__ASSUME_TIME64_SYSCALLS being set does not mean __TIMESIZE is 64,
and __TIMESIZE equal to 64 does not mean __ASSUME_TIME64_SYSCALLS
is set. All four cases are possible. */
#if __LINUX_KERNEL_VERSION >= 0x050100 \
|| __WORDSIZE == 64 \
|| (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 64)
# define __ASSUME_TIME64_SYSCALLS 1
#endif
/* Linux waitid prior kernel 5.4 does not support waiting for the current
process group. */
#if __LINUX_KERNEL_VERSION >= 0x050400
# define __ASSUME_WAITID_PID0_P_PGID
#endif
/* The faccessat2 system call was introduced across all architectures
in Linux 5.8. */
#if __LINUX_KERNEL_VERSION >= 0x050800
# define __ASSUME_FACCESSAT2 1
#else
# define __ASSUME_FACCESSAT2 0
#endif
/* The close_range system call was introduced across all architectures
in Linux 5.9. */
#if __LINUX_KERNEL_VERSION >= 0x050900
# define __ASSUME_CLOSE_RANGE 1
#else
# define __ASSUME_CLOSE_RANGE 0
#endif
/* The FUTEX_LOCK_PI2 operation was introduced across all architectures in Linux
5.14. */
#if __LINUX_KERNEL_VERSION >= 0x050e00
# define __ASSUME_FUTEX_LOCK_PI2 1
#else
# define __ASSUME_FUTEX_LOCK_PI2 0
#endif
#endif /* kernel-features.h */