Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFH r230007, r230388: document quiet*, fix devd/dhclient interaction.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Clean up rc.subr man page after removing leftover NetBSD compat. Also
switch to 2-clause license per NetBSD rc.subr.8 r1.19.

Submitted by: Alex Kozlov

Properly underline force_depend's parameter.

Reviewed by: brueffer

Fix punctiation.

Approved by: ru

o Add a note that checkyesno takes a variable by its name, not value.
o Improve mdoc(7) markup and style of the paragraph on stop_boot.

o Implement the stop_boot subroutine [1]. This subroutine can be used by
scripts in rc.d to stop rc(8) from booting into multi-user mode when
a critical or severe error condition is encountered.

o Modify scripts in etc/rc.d that already implemented this functionality
independently.

o Document it.

[1] - This subroutine was implemented in FreeBSD in rc.d/fsck. I moved it
to rc.subr(8). Our version differs slightly in that it takes an
optional argument to stop the boot even if "autoboot" is not set.

Obtained from: NetBSD
MFC after: 2 weeks

MFp4:

Document my recent changes to rc.subr(8):
- there is $required_modules now;
- $required_* are checked before invoking a custom start method, too.

MFC after: 1 month

Backout this commit since it breaks startup and some scripts in
certain conditions. I haven't been able to find a better solution yet:

- Set a two read-only variables (${prefix} and ${etcdir}). This is
especially useful when using /etc/rc.d scripts with third-party
software installed from ports.
- Fix rc.d/sshd to work with openssh from ports using ${etcdir}
instead of hardcoded /etc.
- Reflect prefix/etcdir changes in rc.subr.8.

src/etc/rc.d/sshd: rev 1.9 -> 1.10
src/etc/rc.subr: rev 1.51 -> 1.52
src/share/man/man8/rc.subr.8: rev 1.11 -> 1.12

Approved by: cperciva (mentor)

Improve mark-up: References to "start" as an rc.d method
should be tagged with ".Cm". (Refs to "stop" are OK already.)

MFC after: 3 days

Don't forget to touch Dd.

Quite a number of rc.d scripts try to load kernel modules. Many
of them do that conditionally depending on kldstat. The code is
duplicated all over, but bugs can be uniqie.

To make the things more consistent, introduce a new rc.subr function,
load_kld, which takes care of loading a kernel module conditionally.

(Found this lying for a while in my p4 branch for various hacks.)

Reflect latest changes in rc.subr wrt prefix/etcdir variables being set
automatically by load_rc_config.

With help from: ru (mdoc-fu)
Reviewed by: brueffer
Approved by: cperciva

- Sync rc.subr with NetBSD.
- Merge some documentation bits.

Reviewed by: brooks, simon (doc)
Approved by: cperciva (mentor)
Obtained from: NetBSD
MFC after: 3 days

Forgot to bump .Dd in the last commit.

Document the relation between $command and $foo_program.

PR: docs/68453
MFC after: 3 days

Use consistent punctuation and vertical indenting around .Dl's.
Wrap a too long line.

Document that `reload' is not provided by default
yet it can be enabled when applicable.

Fixed markup.

Mechanically kill hard sentence breaks and double whitespaces.

NetBSD rev. 1.10
successful [is spelled] with only one l

NetBSD rev. 1.12
Implement ``one'' prefix to allow a "one shot" operation as if
${rcvar}=yes yet all the other prerequisite tests are still performed.
The existing ``force'' prefix is a sledgehammer that ignores all the
prerequisite checks and always returns a zero exit status; this is a
more gentle approach to the problem of "manipulate this disabled
service without editing rc.conf(5)".

Obtained From: NetBSD

FreeBSD has no systrace(1), and our rc.subr does not support it.

Submitted by: Simon L. Nielsen <simon@nitro.dk>

english(4) police.

Update rc(8) manpage to reflect rc.d
Add an rc.subr(8) manpage
Hook rc.subr.8 up to the build.

Submitted by: Mike Makonnen <mtm@identd.net>
Approved by: re@ (bmah)
Obtained from: NetBSD