Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Mark usage function as __dead2 in programs where it does not return

In most cases, usage does not return, so mark them as __dead2. For the
cases where they do return, they have not been marked __dead2.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/735

spdx: The BSD-3-Clause-FreeBSD identifier never was, drop -FreeBSD

There never was a BSD-3-Clause-FreeBSD SPDX identifier. Replace it
with BSD-3-Clause.

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

[skip ci] correct a few SPDX license tags

These were all incorrectly labeled as 2-clause BSD licenses by a
semi-automated process, when in fact they are 3-clause.

Discussed with: pfg, imp
MFC after: 2 weeks
Sponsored by: Axcient

In the endless batch mode (-B), terminate if and when stdout is closed.
That mode is useful to call gstat from other app, however kinda useless
since gstat won't exit and stay running forever when its parent process
has long gone.

MFC after: 2 weeks

- Add CSV output to gstat via -C flag.

Add a -C option, similar to -B, that allows gstat to produce basic CSV output
with absolute timestamps (ISO 8601, nearly.) Multiple devices are handled by
way of a single-pivot CSV table with duplicated timestamps for each object
output.

Submitted by: Nick Principe <nap__ixsystems.com>
Reviewed by: myself, imp@, asomers (earlier verison), bcr (manpages)
Sponsored by: iXsystems Inc.
Differential Revision: https://reviews.freebsd.org/D16151

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.

Add flag -B which does the same like batch mode but without exiting after
print. Also add a new flag -s that add blocks size to statistics.

PR: 198347, 212726
Submitted by: Ben RUBSON <ben.rubson@gmail.com>
Tested by: pi
MFC After: 2 weeks.

Fix gstat's interactive f and q commands

curses and libedit don't play well together. After last year's libedit
upgrade in head, they play even less well together. This change resets some
curses settings after they get screwed up by libedit calls. Without it,
gstat's interactive commands require an extra "enter", screw up the terminal
on exit, and screw up the display if the user enters an invalid filter
string.

PR: 204852
Submitted by: Keith White
Reviewed by: pfg
Approved by: re (gjb)
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D6934

Use strlcpy() in favor of strncpy() as it's defined to have a nul character
at the end of string buffer, and the code context do expects this to behave
correctly (e.g. strchr).

Note that we do not believe there is real-world impact for gstat(8)'s usage
because the strings are length checked, and the on-stack buffer belongs to
main() and we can expect to have zeros in them.

MFC after: 2 weeks

Add an option, -p, which makes gstat(8) to only display physical providers
(those with rank of 1).

MFC after: 2 weeks

Add -o option to gstat to display "other" operatins (e.g. BIO_FLUSH).

MFC after: 1 week

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.

o Turn the batch mode on if stdout is not tty.

Submitted by: vsevolod
MFC after: 1 week

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

- Allow gstat to print values to different kind of outputs.
- Introduce batch mode, where gstat will collect the numbers, print them, and
exit.
- Document batch mode in the gstat man page.

Submitted by: anders

When the ms/req fields exceed 1 second, drop the fractions to fit more digits.

This is unfortunately necessary with some flash based devices which can
get hundreds of seconds behind with softupdates enabled.

Deterministically set the default refresh interval to one second.

Approved by: phk
MFC after: 1 week

- Add support for filtering the the list of providers by a regular
expression, which makes it possible to only see interesting
providers. "f" is used inside gstat to set a filter, "F" is used to
remove current filter.
- Do not print some uninteresting values in the gstat title line.
- Do not print past the end of the screen.
- Read multiple keystrokes per "wait" when gstat is running.
- Remove a redundant != check, right after check of NULL against the
same variable ("gid").
- Use sysexits.h.
- Do not link against libkvm and libsbuf, they are not actually used.
- Fix a few style(9) issues where I had to touch nearby code anyway.

Approved by: cperciva (mentor)
MFC after: 2 weeks

Add forgotten -a to the usage() message.

Add an '-a' switch to only display providers that are at least
0.1% busy.

OK'ed by: phk

Added forgotten -d to the usage().

Remove spurious semicolons. Outside of functions they are actually errors but
GCC doesn't warn about them without -pedantic.

Approved by: das (mentor)
PR: 56649
Reviewed by: md5

Correct a typo in column header.

Submitted by: phk
Obtained from: BSDCan

Make libgeom usable by C++ programs:
- Add DECL wrappers to libgeom.h.
- Rename structure members in libgeom.h to use a lg_ prefix for member
names. This is required because a few structures had members named
'class' which made g++ very unhappy.
- Catch gstat(8) and gconcat(8) up to these API changes.

Reviewed by: phk

Add -d flag to monitor BIO_DELETE operations too

Make -c only set flag_c and not a toggle. With flag_c disabled by
default, this makes the behavior of gstat more predictable when -c is
specified multiple times on the command line.

Add & use a usage() function.

Add error and range checking to strtoul() to avoid ending up with a
delay time of ULONG_MAX when -I is passed a non-numeric arg.

Call endwin() to restore terminal state just before exiting.

Approved by: phk

Add a rudimentary gstat(8) to the system.

This is a small curses based program which shows the diskactivity
inside GEOM.