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Merge tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
Pull pidfd updates from Christian Brauner:
"This adds two main features.
- First, it adds polling support for pidfds. This allows process
managers to know when a (non-parent) process dies in a race-free
way.
The notification mechanism used follows the same logic that is
currently used when the parent of a task is notified of a child's
death. With this patchset it is possible to put pidfds in an
{e}poll loop and get reliable notifications for process (i.e.
thread-group) exit.
- The second feature compliments the first one by making it possible
to retrieve pollable pidfds for processes that were not created
using CLONE_PIDFD.
A lot of processes get created with traditional PID-based calls
such as fork() or clone() (without CLONE_PIDFD). For these
processes a caller can currently not create a pollable pidfd. This
is a problem for Android's low memory killer (LMK) and service
managers such as systemd.
Both patchsets are accompanied by selftests.
It's perhaps worth noting that the work done so far and the work done
in this branch for pidfd_open() and polling support do already see
some adoption:
- Android is in the process of backporting this work to all their LTS
kernels [1]
- Service managers make use of pidfd_send_signal but will need to
wait until we enable waiting on pidfds for full adoption.
- And projects I maintain make use of both pidfd_send_signal and
CLONE_PIDFD [2] and will use polling support and pidfd_open() too"
[1] https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.9+backport%22
https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.14+backport%22
https://android-review.googlesource.com/q/topic:%22pidfd+polling+support+4.19+backport%22
[2] aab6e3eb73/src/lxc/start.c (L1753)
* tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux:
tests: add pidfd_open() tests
arch: wire-up pidfd_open()
pid: add pidfd_open()
pidfd: add polling selftests
pidfd: add polling support
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifdef CONFIG_COMPAT
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#define __ARCH_WANT_COMPAT_STAT64
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#define __ARCH_WANT_SYS_GETHOSTNAME
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#define __ARCH_WANT_SYS_PAUSE
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#define __ARCH_WANT_SYS_GETPGRP
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#define __ARCH_WANT_SYS_NICE
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#define __ARCH_WANT_SYS_SIGPENDING
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#define __ARCH_WANT_SYS_SIGPROCMASK
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#define __ARCH_WANT_COMPAT_SYS_SENDFILE
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#define __ARCH_WANT_SYS_UTIME32
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#define __ARCH_WANT_SYS_FORK
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#define __ARCH_WANT_SYS_VFORK
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/*
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* Compat syscall numbers used by the AArch64 kernel.
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*/
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#define __NR_compat_restart_syscall 0
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#define __NR_compat_exit 1
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#define __NR_compat_read 3
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#define __NR_compat_write 4
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#define __NR_compat_gettimeofday 78
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#define __NR_compat_sigreturn 119
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#define __NR_compat_rt_sigreturn 173
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#define __NR_compat_clock_getres 247
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#define __NR_compat_clock_gettime 263
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#define __NR_compat_clock_gettime64 403
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#define __NR_compat_clock_getres_time64 406
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/*
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* The following SVCs are ARM private.
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*/
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#define __ARM_NR_COMPAT_BASE 0x0f0000
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#define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE + 2)
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#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE + 5)
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#define __ARM_NR_COMPAT_END (__ARM_NR_COMPAT_BASE + 0x800)
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#define __NR_compat_syscalls 435
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#endif
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#define __ARCH_WANT_SYS_CLONE
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#ifndef __COMPAT_SYSCALL_NR
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#include <uapi/asm/unistd.h>
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#endif
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#define NR_syscalls (__NR_syscalls)
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