tests/sendfile: test operation on unix/stream socket

Although there are already multiple tests in the tests collection
that utilize sendfile(2) support over unix/stream socket, they all
don't exerci

tests/sendfile: test operation on unix/stream socket

Although there are already multiple tests in the tests collection
that utilize sendfile(2) support over unix/stream socket, they all
don't exercise the asynchronous part of the operation. This test
framework, however, uses a trick to toggle true async operation and
guarantee that pr_ready method of unix/stream is also tested.

Reviewed by: chs
Differential Revision: https://reviews.freebsd.org/D45055

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tests: don't run atf_* in a subshell

Shell limitation is that a classic function call via $() is a subshell
and atf-sh(3) commands won't work as epxected there. Subsequently,
atf_skip inside a func

tests: don't run atf_* in a subshell

Shell limitation is that a classic function call via $() is a subshell
and atf-sh(3) commands won't work as epxected there. Subsequently,
atf_skip inside a function won't skip a test. The test will fail later.

A working approach is to pass desired variable name as argument to
a function and don't run subshell.

Reviewed by: ngie
Differential Revision: https://reviews.freebsd.org/D42646
Fixes: ea82362219ee715cfbb195b2114e73fdc8599fa5

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tests: Skip all tests that require mdconfig when /dev/mdctl missing

When run in a jail, /dev/mdctl is missing. So skip any tests that use
mdconfig or mdmfs with md in this case: they can't possibly

tests: Skip all tests that require mdconfig when /dev/mdctl missing

When run in a jail, /dev/mdctl is missing. So skip any tests that use
mdconfig or mdmfs with md in this case: they can't possibly work. This
is in line with other tests that test for presence of required features
and skip if they aren't present. I did this instead of checking for
jails so they can still run in jails that allow creation of md devices.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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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sendfile tests: Mount filesystems under the test workdir

Otherwise they can't be run in parallel as they share a mount point.

MFC after: 1 week

kyua/qemu: When running in qemu, don't teset sendfile

qemu's bsd-user doesn't implement sendfile, so just skip those tests
that use it.

Sponsored by: Netflix

MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

add a few tests for sendfile.

Reviewed by: markj
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D25431