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.

MFC r313273:

style(9) cleanup

- Delete trailing whitespace
- Fix alignment/variable sorting
- Delete single-line enclosing braces

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

Use nitems() from sys/param.h.

MFC after: 2 weeks.

Fix dmesg(1) -> dmesg(8)

Reported by: trasz

Fix typo

Reported by: dumbbell

Point the user to dmesg(1) to get informations about why loading a module did fail
instead of printing the cryptic "Exec format error"

MFC after: 1 week

Fix error counting

Import error message shown to the user when trying to load a module that is
already loaded or compiled withing the kernel

MFC after: 1 week

Add option to ignore error codes if the module specified is already loaded.

MFC after: 1 week

Make flags in usage() and SYNOPSYS more style(9)-ish.

Suggested by: brian
MFC after: 3 days

o Add -q flag to usage().

MFC after: 1 week

Perform some checking on the requested list of modules to warn people if they
try to load modules by filename out of the current directory where the module
in question may be further up the module path or not in the module path at all.

Also add some text to the man page to help explain what's going on.

Sponsored by: Redacted Consulting

style(9) pass prior to further changes.

Sponsored by: Redacted Consulting

Use __FBSDID() to quiet GCC 3.3 warnings.

Update documentation for kldload(8)'s ability to load multiple modules.

Submitted by: Daniel O'Connor <doconnor@gsoft.com.au>

Make it possible to kldload(8) many modules.

MFC after: 2 months
Sponsored by: Bright Path Solutions
Reviewed by: tjr

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

$Id$ -> $FreeBSD$

remoce unused #include.

Add -v in usage string. Add rcsid.

a few code style changes:
o start function names in column 1
o sort order of flags in getopt and switch
o don't try to reference progname
o unspam some changes introduced by a 2.2.1-R build box instead of a
-current build box

doc changes:
o document when these commands first appeared
o put email address in angle brakets
o minor mdoc clean up

activate the programs that will be used to manipulate kld modules

fix a few problems with missing headers, warn called with an exit
value, and undeclared getopt vars

these programs now compile -Wall clean (and yes, I know I should use
more than just -Wall) :)

Add utilities for the kernel linker.