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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

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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

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.

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Merge ^/head r303250 through r304235.

Use nitems() from sys/param.h

Sponsored by: gandi.net (BSD Day Taiwan)

Fix typo: actually test the return of strchr(3)

Reported by: Coverity
CID: 1007335
MFC after: 3 days

Merge from head@274682

IFC @r272481

Sync to HEAD@r272516.

Reintegrate head@r272414

Sponsored by: The FreeBSD Foundation

Sigh, remove a line that needs to be removed along with previous commit.

Submitted by: mjg
MFC after: 3 days
X-MFC-with: 272288

When setting environment variables in the atrun script, use the
"export foo=bar" form instead of "foo=bar; export foo" since the
former allows the shell to catch variable names that are not valid
she

When setting environment variables in the atrun script, use the
"export foo=bar" form instead of "foo=bar; export foo" since the
former allows the shell to catch variable names that are not valid
shell identifiers. This will cause /bin/sh to exit with an error
(which gets mailed to the at user) and it will not run the script.

Obtained from: OpenBSD (r1.63 millert)
MFC after: 3 days

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IFC @ r254014

IFC @253398

Merge fresh head.

sync from head

- Do not bail out if stat(2) fails with ENOENT in the spool directory. This
happens if another atrm process removes a job while we're scanning through
the directory.
- While at it, optimize a bit

- Do not bail out if stat(2) fails with ENOENT in the spool directory. This
happens if another atrm process removes a job while we're scanning through
the directory.
- While at it, optimize a bit the directory scanning, so that we quit looping
as soon as all jobs specified in argv have been dealt with.

Approved by: cognet

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IFC @230489 (pending review).

IFC @ r227804

Pull in the virtio drivers from head.

Partially revert r227233.

The privs.h header is not only used by at(1), it's also used by
atrun(8). Just let the code the way it used to be (for now).

Reported by: kwm, tinderbox
Hat to: me

Add missing static keywords to at(1).

While there, tidy up the privs.h part, where at.c has to #define to
declare some globals. Also group static and non-static global variables
in at.c.

Sync: merge r215464 through r215708 from ^/head.

Close file and directory descriptors

MFC after: 3 days

IFH@204581

Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.