Implement CLOCK_TAI

Provide a clock through clock_gettime() that returns the current TAI
time (UTC without leap seconds) as a complement to CLOCK_REALTIME. This
provides compatibility with Linux, wh

Implement CLOCK_TAI

Provide a clock through clock_gettime() that returns the current TAI
time (UTC without leap seconds) as a complement to CLOCK_REALTIME. This
provides compatibility with Linux, which also provides a CLOCK_TAI since
kernel 2.6.26, and this seems to be becoming the standard way to acquire
TAI time. Unlike Linux, this code will return EINVAL if the TAI offset
(set by ntpd, ptpd, etc.) is not known since it seems pathological for
CLOCK_TAI to silently give the wrong (UTC) time if the offset is not
known as it does on Linux.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D46268

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libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

Add documentation for the sigevent structure.

- Add a sigevent(3) manpage to give a general overview of the sigevent
structure and the available notification mechanisms.
- Document that AIO reques

Add documentation for the sigevent structure.

- Add a sigevent(3) manpage to give a general overview of the sigevent
structure and the available notification mechanisms.
- Document that AIO requests contain a nested sigevent structure that can
be used to request completion notification.
- Expand the sigevent details in other manuals to note details such as
the extra values stored in a queued signal's information or in a posted
kevent.

Reviewed by: kib
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D7122

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General mdoc(7) and typo fixes.

PR: 167713
Submitted by: Nobuyuki Koganemaru (kogane!jp.freebsd.org)

Fix typo in timer_getoverrun cross-reference.

MFC after: 3 days

- add missing include
- fix struct memeber's name [1]

PR: docs/130413 [1]
Submitted by: Thomas Mueller <tmueller@sysgo.com> [1]
MFC after: 3 days

Fix library names.

Markup fixes.

Sort .Xr by section number.

Submitted by: ru

Add cross references to siginfo.3.

Update conformance and history sections.

Fix up markup etc. in recently born manpage.

Insert missing copyright headers.

Fix copy-paste issue.

Add POSIX timer manuals.