usr.bin: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

usr.bin/who.c: Fix boot time checking

The boot time entry doesn't have a tty specified, so don't check it.
While here, make ttystat handle that case.

Approved by: kevans (src)
Differential Revision: https://reviews.freebsd.org/D34524

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.

And of course, I forgot to add -a to the usage.

Attempt to implement who -a.

According to POSIX, -a is equal to -bdlprtTu. It seems this is not true
in practice, as -b normally restricts the output to BOOT_TIME entries
and all implementations that I know of don't.

Add the XSI option -b to show date of the last reboot.

That required to increase the LINE field to fit the output of -b.
While here, change the row() function to take a const argument.

In collaboration with: ed

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Perform all trivial ports to utmpx for usr.bin/.

They were already converted to use libulog, so it's easy to convert them
to utmpx.

Several refinements to libulog's API.

- Only set the fields in the ulog_utmpx structure that are valid for the
command in question. This means that strings like "shutdown" or "~"
are not visible to the user anymore.
- Rename UTXF_* to UTXI_*, indicating the indexation, instead of using
the `antique' filename. If we ever get rid of utmp, it makes little
sense calling it by its old name.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

Port who(1) to utmpx.

(Un)fortunately there is no standardized interface to switch between
utmp database files, so we must call ulog_setutxfile() here.

I'm also changing the column widths to magic numbers here. Display
layout should in this case not be derived from structure fields sizes.
Because I don't want struct utmpx ever to become too small, the fields
are too big to reserve all the space.

- Import the HEAD csup code which is the basis for the cvsmode work.

In wall and who, check that the utmp entry isn't stalled, as it is done in w.
Apparently with the new pts code stalled entries are printed, when they are
not with the BSD ptys.

Submitted by: Michal Mertl <mime at traveller dot cz>

Move variable initialization to reduce compiler warning.

Fix a warning that showed up on 64 bit systems. It was actually a real
bug that had been swept under the carpet.

Remove unimplemented System V options from the getopt() option string.

utmp.ut_time and lastlog.ll_time are explicitly int32_t rather than
time_t. Deal with the possibility that time_t != int32_t. This boils
down to this sort of thing:
- time(&ut.ut_time);
+ ut.ut_time = time(NULL);
and similar for ctime(3) etc. I've kept it minimal for the stuff
that may need to be portable (or 3rd party code), but used Matt's time32
stuff for cases where that isn't as much of a concern.

Approved by: re (jhb)

Style: put static qualifier on definition of static functions.

Respect the setting of the COLUMNS environment variable, use it instead of
the TTY width obtained by ioctl() when set & non-null. (SUSv3)

Write "FROM" heading above the hostname column, like NetBSD and GNU do.

Reimplement the who(1) utility to add some features required by SUSv3:
-H option (show column headings),
-T (show mesg(1) state),
-m (same as "am I"),
-u (show idle time),
-q (quick mode; list names in columns).

PR: 36128
Reviewed by: mike

remove __P

WARNS=2 fix, use __FBSDID().

WARNS=2 is not in Makefile, as this will be the default.

Include missing header files which define functions for which gcc has
builtins (e.g., exit, strcmp).

Don't attempt to parse %c

$Id$ -> $FreeBSD$

Back out Steve's fix, as this was already fixed by me in revision 1.6

Only allow 'who' and 'who am i' as valid usages.

PR: 6294
Submitted by: Ruslan Ermilov <ru@ucb.crimea.ua>

Check that user really typed "who am {I,i}", and that no stray
arguments are given.
Note that usage() and the manpage disagree...

PR: bin/6294
Suggested by: Ruslan Ermilov and Bruce Evans
Submitted by: Ruslan Ermilov (partly)

Use err(3). Add usage().

Made sure the string formated by strftime() is properly
null-terminated.

Fixed a wrong if statement which should test a string is
empty where in fact it tested the string pointer was NULL.

Should go to RELENG_2_1 and RELENG_2_2.

Reviewed by guido@freebsd.org.

Add setlocale LC_TIME

Replace ctime by strftime %c to use national date representation now

BSD 4.4 Lite Usr.bin Sources