MFC r340861, r340900:
Minor kevent(2) cleanups.

Make timespecadd(3) and friends public

The timespecadd(3) family of macros were imported from NetBSD back in
r35029. However, they were initially guarded by #ifdef _KERNEL. In the
meantime, we have

Make timespecadd(3) and friends public

The timespecadd(3) family of macros were imported from NetBSD back in
r35029. However, they were initially guarded by #ifdef _KERNEL. In the
meantime, we have grown at least 28 syscalls that use timespecs in some
way, leading many programs both inside and outside of the base system to
redefine those macros. It's better just to make the definitions public.

Our kernel currently defines two-argument versions of timespecadd and
timespecsub. NetBSD, OpenBSD, and FreeDesktop.org's libbsd, however, define
three-argument versions. Solaris also defines a three-argument version, but
only in its kernel. This revision changes our definition to match the
common three-argument version.

Bump _FreeBSD_version due to the breaking KPI change.

Discussed with: cem, jilles, ian, bde
Differential Revision: https://reviews.freebsd.org/D14725

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linuxulator: do not include legacy syscalls on arm64

Existing linuxulator platforms (i386, amd64) support legacy syscalls,
such as non-*at ones like open, but arm64 and other new platforms do
not.

linuxulator: do not include legacy syscalls on arm64

Existing linuxulator platforms (i386, amd64) support legacy syscalls,
such as non-*at ones like open, but arm64 and other new platforms do
not.

Wrap these in #ifdef LINUX_LEGACY_SYSCALLS, #defined in the MD linux.h
files. We may need finer grained control in the future but this is
sufficient for now.

Reviewed by: andrew
Sponsored by: Turing Robotic Industries
Differential Revision: https://reviews.freebsd.org/D15237

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Eliminate the overhead of gratuitous repeated reinitialization of cap_rights

- Add macros to allow preinitialization of cap_rights_t.

- Convert most commonly used code paths to use preinitialized c

Eliminate the overhead of gratuitous repeated reinitialization of cap_rights

- Add macros to allow preinitialization of cap_rights_t.

- Convert most commonly used code paths to use preinitialized cap_rights_t.
A 3.6% speedup in fstat was measured with this change.

Reported by: mjg
Reviewed by: oshogbo
Approved by: sbruno
MFC after: 1 month

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Linuxolator whitespace cleanup

A version of each of the MD files by necessity exists for each CPU
architecture supported by the Linuxolator. Clean these up so that new
architectures do not inherit

Linuxolator whitespace cleanup

A version of each of the MD files by necessity exists for each CPU
architecture supported by the Linuxolator. Clean these up so that new
architectures do not inherit whitespace issues.

Clean up shared Linuxolator files while here.

Sponsored by: Turing Robotic Industries Inc.

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Linux epoll return EEXIST on case when op is EPOLL_CTL_ADD, and the supplied
file descriptor fd is already registered with this epoll instance.

MFC after: 1 month

Linux epoll return ENOENT error in case when op is EPOLL_CTL_MOD or
EPOLL_CTL_DEL, and fd is not registered with this epoll instance.

MFC after: 1 month

FreeBSD does not have analgue for epill EPOLLPRI event type.
So, do not set EPOLLPRI event acidently.
Also, do not set EPOLLWRNORM and EPOLLRDNORM events as epoll
do not set this events.

MFC after:

FreeBSD does not have analgue for epill EPOLLPRI event type.
So, do not set EPOLLPRI event acidently.
Also, do not set EPOLLWRNORM and EPOLLRDNORM events as epoll
do not set this events.

MFC after: 1 month

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Return EINVAL when an invalid file descriptor specified.

MFC after: 1 month

Unify eventfd ioctl method and use it for other similar interfaces.

MFC after: 1 month

Return EINVAL in case when an invalid size of signal mask specified.

MFC after: 1 month

Restore signal mask in epoll_pwait.

MFC after: 1 month

Return EINVAL when an invalid file descriptor is specified.

MFC after: 1 month

Implement timerfd family syscalls.

MFC after: 1 month

Nostly style(9) changes, replace unused eventfd_truncate()
by default invfo_truncate() method.

MFC after: 1 month

Catch up to sys/capability.h rename to sys/capsicum.h in r263232

MFC after: 1 month
Sponsored by: The FreeBSD Foundation

When write(2) on eventfd object fails with the error EAGAIN do not return
the number of bytes written.

MFC after: 1 week

Implement O_NONBLOCK flag via fcntl(F_SETFL) for eventfd object.

MFC after: 1 week

Allow the creation of kqueues with a restricted set of Capsicum rights.

On CloudABI we want to create file descriptors with just the minimal set
of Capsicum rights in place. The reason for this is t

Allow the creation of kqueues with a restricted set of Capsicum rights.

On CloudABI we want to create file descriptors with just the minimal set
of Capsicum rights in place. The reason for this is that it makes it
easier to obtain uniform behaviour across different operating systems.

By explicitly whitelisting the operations, we can return consistent
error codes, but also prevent applications from depending OS-specific
behaviour.

Extend kern_kqueue() to take an additional struct filecaps that is
passed on to falloc_caps(). Update the existing consumers to pass in
NULL.

Differential Revision: https://reviews.freebsd.org/D3259

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Add EPOLLRDHUP support.

Tested by: abi at abinet dot ru

Implement epoll_pwait() system call.

Add EPOLLERR flag handling to epoll.

Tested by: abi at abinet dot ru

As fo_fill_kinfo() does not check fo_fill_kinfo to NULL
add a fo_fill_kinfo op to eventfdops.

Reported by: trinity

Implement eventfd system call.

Differential Revision: https://reviews.freebsd.org/D1094
In collaboration with: Jilles Tjoelker

Implement epoll family system calls. This is a tiny wrapper
around kqueue() to implement epoll subset of functionality.
The kqueue user data are 32bit on i386 which is not enough for
epoll user data,

Implement epoll family system calls. This is a tiny wrapper
around kqueue() to implement epoll subset of functionality.
The kqueue user data are 32bit on i386 which is not enough for
epoll user data, so we keep user data in the proc emuldata.

Initial patch developed by rdivacky@ in 2007, then extended
by Yuri Victorovich @ r255672 and finished by me
in collaboration with mjg@ and jillies@.

Differential Revision: https://reviews.freebsd.org/D1092

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