MFC r326276:

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.

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

Add META_MODE support.

Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.

Still need to add real targets under targets/ to build packages.

Differential Revision: D2796
Reviewed by: brooks imp

Move example to EXAMPLES.

Bump date missed in r202756

PR: docs/171624
Submitted by: bdrewery
Approved by: gabor
MFC after: 3 days

Also relicense the ac(8) man page.

MFC after: 1 month
Discussed with: Simon Gerraty and Chris Demetriou

Relicense ac(8).

Though the license of the original ac(8) source code provides many
liberties, we are already somewhat violating it. The license requires us
to clearly comment any modifications to the source code, as the original
authors of course do not want to get bug reports for modified versions
of ac(8). This is something we have not done consistently.

The need for such a license clause has become less over time. It is very
unlikely that end users will contact the original authors, as the
copyright is from 1994. I contacted both the copyright holders. They
responded in a timely fashion and were more than willing to relicense it
to a 2-clause BSD license. To address any concerns about bug reports
going to the original authors instead of me, add my own name and email
address to the copyright statements as well.

MFC after: 1 month
Special thanks to: Christopher Demetriou and Simon Gerraty

Use better variable naming.

MFC after: 1 month

Massively refactor ac(8).

- Use queue(3) -- not some homegrown implementation of linked lists.
- Rename structures to _entry, as they are entries in the linked list --
not the lists themselves.
- Don't store entire copies of struct utmpx in utmpx_entry, but only the
members we're interested in. Large fields such as hostnames are not
needed during the execution of the program.
- Give structure members useful names, instead of `name'.
- While there, use struct timevals instead of time_t's internally. This
is not strictly useful, but while we're at it...
- Mark stuff static.
- Add missing const keywords.
- Remove unneeded prototypes.
- Remove workaround for sparc64-specific utmp problems. These don't
apply to utmpx.
- Don't discard entries when timestamps are not monotone. This shouldn't
ever happen with utmpx, but discarding them is a bit too harsh.
- Remove debug code. We nowadays have `getent utmpx', which can be used
to analyze logfiles in depth.
- Use proper uppercasing/periods in comments.
- Print output of `ac -p' sorted alphabetically, instead of first
occurrence.
- Properly check against pts/* instead of tty[PQRSpqrs]* to determine
whether a TTY is a pseudo-terminal.

MFC after: 1 month

Fix whitespace.

mdoc: correct .Bd/.Bl arguments.

Reviewed by: brueffer

Fix double ;;

MFtbemd:

Prefer MACHNE_CPUARCH to MACHINE_ARCH in most contexts where you want
to test of all the CPUs of a given family conform.

Properly initialize the timestamp when using ac -w.

When using ac -w, we must use the last timestamp to terminate the log
file. I accidentally removed this when I ported the code to use utmpx.

Reported by: avg

Remove stale references to utmp(5) and its corresponding filenames.

I removed utmp and its manpage, but not other manpages referring to it.

Port ac(8) to utmpx.

Similar to last(1), it must compare ut_id's instead of TTYs to determine
whether a session has been terminated. It must also use ut_type to
determine the type of the login record instead figuring it out by
itself.

The last big commit: let usr.sbin/ use WARNS=6 by default.

Sort sections.

Added the EXIT STATUS section where appropriate.

Mechanically kill hard sentence breaks.

Add a check for wtmp records which have invalid values for ut_time. Wtmp
records with time==0 get "the time of the last valid record", while records
where time goes backwards (compared to the previous record) are skipped.
Also prints a message saying how many records were changed or skipped due
to these checks. Check was inspired by a simpler check in OpenBSD's version.

This is all meant to sidestep problems that Tillman Hodgson noticed with 'ac'
when running sparc64 with 64-bit time_t's. The real problem is whatever is
creating wtmp records with ut_time==0, of course, but I have not yet figured
out what is doing that.

Reviewed by: no screams from freebsd-sparc64 or bde
MFC after: 2 weeks

Compile 'ac' with DEBUG when arch==sparc64.

Add a debug-statement from NetBSD, and then rework all debug-statements
so the program compiles without errors or warnings when DEBUG is defined on
sparc64 with 64-bit time_t's. Also have debug statements include the year
when printing records from a different year than 'now'. Also print out a
special timestamp in debug statements when ut_time==0.

Reviewed by: freebsd-sparc, bde
MFC after: 2 weeks

Minor style(9) fixes. remove a register keyword, correct two indents.
Noticed while comparing to OpenBSD version.

Convert K&R-style routine definitions to C89 style, partially to reduce
diffs with OpenBSD. This causes no changes to the object produced.

Remove unused #includes. Eliminate castings by using size_t instead of int.

The .Nm utility

Fix indentation broken in previous __P removal.

Grumbled about by: bde

de-__P()

Fixed some world breakage caused by not updating clients when <timeconv.h>
was split off from <time.h>. This became fatal here when -Werror was
reenabled.

I've been meaning to do this for a while. Add an underscore to the
time_to_xxx() and xxx_to_time() functions. e.g. _time_to_xxx()
instead of time_to_xxx(), to make it more obvious that these are
stopgap functions & placemarkers and not meant to create a defacto
standard. They will eventually be replaced when a real standard
comes out of committee.

localtime() was being called with an int-pointer due to recent utmp
fixes.

Don't mention wtmp.[0-7] in the FILES section. This manual page
doesn't talk about these files elsewhere, doesn't use the files by
default, and the names are dependent on site-specific newsyslog
configuration.

PR: 30348
Submitted by: Giorgos Keramidas <charon@labs.gr>

mdoc(7) police: utilize the new .Ex macro.

Fix logic error resulting in incorrect calculation of login time

PR: bin/4204
Submitted by: Anatoly A. Orehovsky <tolik@www.tomsk.su>
MFC after: 4 weeks

Replace strncpy -> strlcpy

Obtained from: OpenBSD
MFC after: 1 week

Perform a major cleanup of the usr.sbin Makefiles.
These are not perfectly in agreement with each other style-wise, but they
are orders of orders of magnitude more consistent style-wise than before.

Remove whitespace at EOL.

Constify and set WARNS=2.

Submitted by: Mike Barcroft <mike@q9media.com>
Reviewed by: md5(1)

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Use nl_langinfo instead of %Ef

Set the default manual section for usr.sbin/ to 8.

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

Use %Ef instead of hardcoded %b %e

err -> errx for malloc failure

$Id$ -> $FreeBSD$

Back out previous commit. Allowing `-' as a pseudonym for /dev/stdin is
legacy behaviour inherited from systems that don't have /dev/stdin.

Requested by: bde

Allow the use of `-' as an argument to the -w option so that standard
input may be used (e.g. gunzip -c /var/log/wtmp.Jan.gz | ac -w - ).

PR: 12467
Submitted by: wollman

/var/log/wtmp entries for ptys are treated differently in ac, since
they may not be logins. The code for determining whether it is a pty
entry is broken.

PR: 7137
Reviewed by: phk
Submitted by: Tom Rush <tarush@mindspring.com>

Give correct times with old wtmp files.

PR: 4732
Submitted by: Andrew Timonin <tim@pool1.convey.ru>

Style in rcsid, sort #include.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Revert $FreeBSD$ to $Id$

Sort cross references.

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.

Correct some man page cross references and file location references.

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

Fix a variety of minor typos and cross references in a bunch of
man pages.

Masanobu Saitoh <msaitoh@spa.is.uec.ac.jp>
Giles Lean <giles@nemeton.com.au>
<soda@sra.co.jp>

Add setlocale LC_TIME

Make it clear that the printed times are measured in hours.

Submitted by: mrami@minerva.cis.yale.edu

Remove trailing whitespace.

strncmp use wrong utmp name size
Submitted by: rlz@zeus.id.net

ac(8) utility, brought over from FreeBSD 1.1.5.

This commit was generated by cvs2svn to compensate for changes in r1553,
which included commits to RCS files with non-trunk default branches.