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06436acf81
This patch refactor the internal sysvipc in two main points:
1. Add a new __ASSUME_SYSVIPC_DEFAULT_IPC_64 to infer the __IPC_64
value to be used along either the multiplexed __NR_ipc or wired-up
syscall. The defaut value assumed for __IPC_64 is also changed
from 0x100 to 0x0, aligning with Linux generic UAPI. The idea
is to simplify the Linux 5.1 wire-up for sysvipc syscalls for
some 32-bit ABIs (which expectes __IPC_64 being 0x0) and simplify
new ports (which will no longer need to add ipc_priv.h).
2. It also removes some duplicated internal definition used on compat
sysvipc symbols defined at ipc_priv.h (more specifically the
__old_ipc_perm, SEMCTL_ARG_ADDRESS, MSGRCV_ARGS, and
SEMTIMEDOP_IPC_ARGS). The idea is also to make it simpler to enable
the new wire-up sysvipc syscall provided by Linux v5.1.
There is no semantic change expected on any port. Checked with a build
against all affected ABIs.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
59 lines
2.0 KiB
C
59 lines
2.0 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) 2006-2019 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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<https://www.gnu.org/licenses/>. */
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#include <endian.h>
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#include_next <kernel-features.h>
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/* The ARM kernel before 3.14.3 may or may not support
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futex_atomic_cmpxchg_inatomic, depending on kernel
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configuration. */
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#if __LINUX_KERNEL_VERSION < 0x030E03
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# undef __ASSUME_SET_ROBUST_LIST
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#endif
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/* ARM fadvise64_64 reorganize the syscall arguments. */
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#define __ASSUME_FADVISE64_64_6ARG 1
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/* Define this if your 32-bit syscall API requires 64-bit register
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pairs to start with an even-number register. */
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#define __ASSUME_ALIGNED_REGISTER_PAIRS 1
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/* ARM only has a syscall for fadvise64{_64} and it is defined with a
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non-standard name. */
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#define __NR_fadvise64_64 __NR_arm_fadvise64_64
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#define __ASSUME_RECV_SYSCALL 1
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#define __ASSUME_SEND_SYSCALL 1
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/* Support for the mlock2 and copy_file_range syscalls was added to
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the compat syscall table for 64-bit kernels in 4.7, although
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present in 32-bit kernels from 4.4 and 4.5 respectively. */
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#if __LINUX_KERNEL_VERSION < 0x040700
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# undef __ASSUME_MLOCK2
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#endif
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#undef __ASSUME_CLONE_DEFAULT
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#define __ASSUME_CLONE_BACKWARDS 1
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#if __BYTE_ORDER == __BIG_ENDIAN
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# define __ASSUME_SYSVIPC_BROKEN_MODE_T
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#endif
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#undef __ASSUME_SYSVIPC_DEFAULT_IPC_64
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