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/

Update some signal man pages for multithreading.

sigaction(2),sigwait(2),sigwaitinfo(2): Remove [EFAULT] error condition.

Passing an invalid pointer results in undefined behaviour.

The wrappers in libthr access some of the data pointed to by the

sigaction(2),sigwait(2),sigwaitinfo(2): Remove [EFAULT] error condition.

Passing an invalid pointer results in undefined behaviour.

The wrappers in libthr access some of the data pointed to by the arguments
in userland, so that an invalid pointer will cause a signal and not an
[EFAULT] error return.

Furthermore, if the [EFAULT] error occurs when the kernel is writing, it is
not a proper error in the sense that the call still commits (changing the
signal disposition or accepting the signal).

MFC after: 1 week

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Clarify the behaviour of sigwait() on signal interruption, and note
the difference between sigwait() and sigtimedwait()/sigwaitinfo().

Approved by: re (bz)

-mdoc sweep.

Add descriptions about signal queue.

Fixed markup.

The libc_r/man/sigwait.3 manpage has been repocopied to libc/sys/sigwait.2.

Reviewed by: deischen
Repocopy by: markm

The .Fn function. Use .Xr where appropriate.

Add the 'restrict' type qualifier to the prototypes of `sigaction',
`sigprocmask', `sigaltstack', and `sigwait' as well as to the
prototypes of the apparantly unimplemented functions `sigtimedwait'
a

Add the 'restrict' type qualifier to the prototypes of `sigaction',
`sigprocmask', `sigaltstack', and `sigwait' as well as to the
prototypes of the apparantly unimplemented functions `sigtimedwait'
and `sigwaitinfo'. This complies with IEEE Std 1003.1-2001.

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mdoc(7) police: Use the new .In macro for #include statements.

Spell "FreeBSD" with "F" and "BSD" in uppercase.

Remove whitespace at EOL.

/^\.St/ s/-iso9945-1/-p1003.1-96/

Change my email address in the copyright notices for the sake of consistency
(jasone@canonware.com --> jasone@freebsd.org).

mdoc(7) cleanup:

. use real function names as `.Nm' macro argument in NAME section. It allows
them to appear in apropos(1) or whatis(1) output.

. replace empty lines with `.Pp' macro.

. replace ha

mdoc(7) cleanup:

. use real function names as `.Nm' macro argument in NAME section. It allows
them to appear in apropos(1) or whatis(1) output.

. replace empty lines with `.Pp' macro.

. replace hardcoded standard names with their `.St' macro equivalents.

. sort cross references in SEE ALSO section

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Add missing man pages. Fix various compliance bugs, mostly having to do with
error return values. Implement pthread_mutexattr_gettype().

PR: docs/16537, docs/17538