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 $FreeBSD$: one-line nroff pattern

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

Change the return type of msgrcv() to ssize_t as required by POSIX.

It looks like the msgrcv() system call is already written in such a way
that the size is internally computed as a size_t and writt

Change the return type of msgrcv() to ssize_t as required by POSIX.

It looks like the msgrcv() system call is already written in such a way
that the size is internally computed as a size_t and written into all of
td_retval[0]. This means that it is effectively already returning
ssize_t. It's just that the userspace prototype doesn't match up.

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Move msg{snd,recv,get,ctl} manual pages from section 3 to 2.

Approved by: re (kib)

When IPC_NOWAIT is set and there is no message, msgrcv() fails
with errno set to ENOMSG.

PR: docs/82217
Submitted by: delphij
Approved by: re (blanket)

Mechanically kill hard sentence breaks.

mdoc(7) police: "The .Fa argument.".

mdoc(7) police: "The .Fn function".

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

FreeBSD now also defines EIDRM and uses it.

Inspired by PR: 22470
Which was submitted by: Bjorn Tornqvist <bjorn@west.se>
MFC after: 1 week

Remove bogus BUGS section.

FreeBSD _does_ define ENOMSG as per SVID when IPC_NOWAIT is set.

PR: 22470
Submitted by: Bjorn Tornqvist <bjorn@west.se>
MFC after: 1 week

mdoc(7) police: removed HISTORY info from the .Os call.

Prepare for mdoc(7)NG.

Use Fx macro wherever possible.

Whitespace only change: trim trailing whitespace.

Introduce ".Lb" macro to libc manpages.

More libraries manpages updates following.

Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

$Id$ -> $FreeBSD$

Use the .At macro when referencing versions of AT&T UNIX.

Note: you need to install the current groff tmac macros for these
man pages to format correctly. Specifically, rev 1.21 of
contrib_groff/tm

Use the .At macro when referencing versions of AT&T UNIX.

Note: you need to install the current groff tmac macros for these
man pages to format correctly. Specifically, rev 1.21 of
contrib_groff/tmac/doc-syms in -current, or rev 1.17.24 for 3.2-stable

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Fixed spelling of EACCES.

Mdoc cleanup.

Sort cross references.

.Os NetBSD -> .Os FreeBSD.
The pages are not NetBSD specific and FreeBSD is not a child of NetBSD.

Added man pages for msgctl(3), msgget(3), msgrcv(3) and msgsnd(3).

Obtained from: NetBSD