Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix the build of tools/regression/sockets/unix_cmsg

MFC after: 2 weeks

Merge ^/head r312207 through r312308.

MFhead@r312305

Add a new socket option SO_TS_CLOCK to pick from several different clock
sources to return timestamps when SO_TIMESTAMP is enabled. Two additional
clock sources are:

o nanosecond resolution realtime

Add a new socket option SO_TS_CLOCK to pick from several different clock
sources to return timestamps when SO_TIMESTAMP is enabled. Two additional
clock sources are:

o nanosecond resolution realtime clock (equivalent of CLOCK_REALTIME);
o nanosecond resolution monotonic clock (equivalent of CLOCK_MONOTONIC).

In addition to this, this option provides unified interface to get bintime
(equivalent of using SO_BINTIME), except it also supported with IPv6 where
SO_BINTIME has never been supported. The long term plan is to depreciate
SO_BINTIME and move everything to using SO_TS_CLOCK.

Idea for this enhancement has been briefly discussed on the Net session
during dev summit in Ottawa last June and the general input was positive.

This change is believed to benefit network benchmarks/profiling as well
as other scenarios where precise time of arrival measurement is necessary.

There are two regression test cases as part of this commit: one extends unix
domain test code (unix_cmsg) to test new SCM_XXX types and another one
implementis totally new test case which exchanges UDP packets between two
processes using both conventional methods (i.e. calling clock_gettime(2)
before recv(2) and after send(2)), as well as using setsockopt()+recv() in
receive path. The resulting delays are checked for sanity for all supported
clock types.

Reviewed by: adrian, gnn
Differential Revision: https://reviews.freebsd.org/D9171

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Merge ^/head r309758 through r309803.

Check that SCM_XXX timestamp returned by the kernel is less 1 second
away in the past from the current time. This should be plenty for the
scheduler to do its job. It provides assurance that the time

Check that SCM_XXX timestamp returned by the kernel is less 1 second
away in the past from the current time. This should be plenty for the
scheduler to do its job. It provides assurance that the timestamp
returned is actually a valid one, not just some random garbage.

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Merge ^/head r309519 through r309757.

Auto-generate 2 test cases that differ only in structure and SCM_XXX constant
used. We can do it programmatically, but that would make code convoluted
and more complex. I have two more of those types

Auto-generate 2 test cases that differ only in structure and SCM_XXX constant
used. We can do it programmatically, but that would make code convoluted
and more complex. I have two more of those types coming for the CLOCK_REALTIME
and CLOCK_MONOTONIC. This seems like an elegant and scallable approach.

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Refactor the regression test code by splitting huge monolithic C
file into smaller pieces that are hopefully easier to understand
and extend. This is to pave the ground for adding few more
socket tim

Refactor the regression test code by splitting huge monolithic C
file into smaller pieces that are hopefully easier to understand
and extend. This is to pave the ground for adding few more
socket timestamp formats that I am working on here.

No functional changes (I hope).

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will

NO_MAN= has been deprecated in favor of MAN= for some time, go ahead
and finish the job. ncurses is now the only Makefile in the tree that
uses it since it wasn't a simple mechanical change, and will be
addressed in a future commit.

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o Add a collection of regression tests for ancillary (control)
data passing for unix domain sockets, stream and datagram.

There are 15 tests:

Test/Type of socket STREAM DGRAM
------------------

o Add a collection of regression tests for ancillary (control)
data passing for unix domain sockets, stream and datagram.

There are 15 tests:

Test/Type of socket STREAM DGRAM
----------------------------------------------------------------------
Sending, receiving cmsgcred 1 6
Receiving sockcred (listening socket has LOCAL_CREDS) 2 n/a
Receiving sockcred (accepted socket has LOCAL_CREDS) 3 n/a
Receiving sockcred n/a 7
Sending cmsgcred, receiving sockcred 4 8
Sending, receiving timestamp 5 9
Sending, receiving cmsgcred (no control data) 10 13
Sending cmsgcred, receiving sockcred (no control data) 11 14
Sending, receiving timestamp (no control data) 12 15

Currently we pass 8 tests. All the rest marked as TODO.

PR: kern/90800
Submitted by: Andrey Simonenko

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o Add a collection of regression tests for ancillary (control)
data passing for unix domain sockets, stream and datagram.

There are 15 tests:

Test/Type of socket STREAM DGRAM
------------------

o Add a collection of regression tests for ancillary (control)
data passing for unix domain sockets, stream and datagram.

There are 15 tests:

Test/Type of socket STREAM DGRAM
----------------------------------------------------------------------
Sending, receiving cmsgcred 1 6
Receiving sockcred (listening socket has LOCAL_CREDS) 2 n/a
Receiving sockcred (accepted socket has LOCAL_CREDS) 3 n/a
Receiving sockcred n/a 7
Sending cmsgcred, receiving sockcred 4 8
Sending, receiving timestamp 5 9
Sending, receiving cmsgcred (no control data) 10 13
Sending cmsgcred, receiving sockcred (no control data) 11 14
Sending, receiving timestamp (no control data) 12 15

Currently we pass 8 tests. All the rest marked as TODO.

PR: kern/90800
Submitted by: Andrey Simonenko

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