Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix mandoc warnings/errors.

MFC after: 1 week

use .Mt to mark up email addresses consistently (final part)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

Reintroduce the snp(4) driver.

Because the TTY hooks interface was not finished when I imported the
MPSAFE TTY layer, I had to disconnect the snp(4) driver. This snp(4)
implementation has been sitting in my P4 branch for some time now.
Unfortunately it still doesn't use the same error handling as snp(4)
(returning codes through FIONREAD), but it should already be usable.

I'm committing this to SVN, hoping someone else could polish off its
rough edges. It's always better than having a broken driver sitting in
the tree.

Convert the snp(4) driver to use cdevpriv.

Now we have a single /dev/snp device node, which can be opened by
watch(8) multiple times. Even though snp(4) will be dead as of next
week, it's nice having this in SVN, because:

- We may want to MFC it to RELENG_7.
- By the time we fix snp(4) again, it's already there, existing watch(8)
binaries should already work.

Just like bpf(4), I'm adding a symlink from snp0 to snp to remain binary
compatible.

Restore the ability to detach from a tty via SIOCSTTY and document
recent changes in a manpage.

Reviewed by: cognet

Sort sections.

Update to match recent snp fixes.

Reviewed by: dd

mdoc(7) police: laundry.

Correct a few grammar bogons.
MFC after: 3 days

Ispell sweep of share/man/man4.

Remove the stuff about only the superuser being able to use this (see
snp.c 1.64), and add a note to the BUGS section warning the reader
that this manual page is stale and may be inaccurate.

Talk about what the user needs to do to get the snp devices, and how
watch(8) will try to help them by loading the module.

PR: 25420

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

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

Prepare for mdoc(7)NG.

mdoc(7) police: use the new features of the Nm macro.

$Id$ -> $FreeBSD$

.Sh AUTHOR -> .Sh AUTHORS according to mdoc specs.
Use .An/.Aq.

Use the .Fx macro for FreeBSD references for releases prior to 2.0.
Use the .Tn macro for generic FreeBSD references. Cleanup other
formatting problems noticed while making the above changes.

Fixed synopsis (after the cleanup of <sys/snoop.h>, there are no other
prerequisites; previously <sys/ioctl.h> was bogus and some prerequisites
weren't documented).

Revert $FreeBSD$ back to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Sort cross references.

delete doubled words, e.g.: "the the" -> "the"

Fix a bunch of spelling errors in a bunch of man pages.

Fix a minor grammar bug.

Snoop device stuff
* Make snoop see the output in tty ECHO mode
* Allow writing to observed tty (very funny)
* Fix and extend watch util.
* Fix and update manpages

Update to reflect new calling conventions

Correct error in structure definition

Clean up man page

Move ipfirewall.4 & snp.4 facility manpage
to share/man/man4