include: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .h pattern

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

Vendor import of stripped libc++ trunk r366426 (just before the release_90 branch
point):

https://llvm.org/svn/llvm-project/libcxx/trunk@366426

Reduce NL_ARGMAX to 4096 to match Linux.

NL_ARGMAX is the maximum number of positional arguments supported by
printf(3). Prior to r308145 it was declared as 99 and not enforced.
r308145 added enforcement and increased the value to 64k.

Unfortunately, development versions of PostgreSQL used the system
definition to allocate and zero an NL_ARGMAX * 4 sized array on the
stack of its snprintf implementation with measurable performance
impacts. This has been fixed in new PostgreSQL versions, but it is
possible that other programs suffer from this problem.

A value of 4096 puts us on par with Linux and is certainly large enough
for any reasonable program.

Reviewed by: mjg
Reported by: mjg
Approved by: re (gjb)
Differential revision: https://reviews.freebsd.org/D17387
Differential revision: https://reviews.freebsd.org/D8286

include: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Vendor import of libc++ trunk r290819:
https://llvm.org/svn/llvm-project/libcxx/trunk@290819

Detect integer overflow and limit the number of positional
arguments in the string format.

Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Differential Revision: https://reviews.freebsd.org/D8286

- Add the definition of CHARCLASS_NAME_MAX, as per POSIX.1-2001.
- Avoid namespace pollution and move definitions of _POSIX2_CHARCLASS_NAME_MAX
and _POSIX2_COLL_WEIGHTS_MAX into the .2001 section.
With input from bde.

Submitted by bde

POSIX.1-2008 moved some constants from the XSI option to the Base.

MFC after: 2 weeks

Fix some _POSIX minimum/maximum values in limits.h:
* Some values changed in POSIX.1-2001; provide the former value if a program
requests compliance to an earlier version of POSIX. [1]
* Add missing _POSIX_CLOCKRES_MIN constant. This is a maximum value but
otherwise works the same as the minimum values.

PR: standards/104743
Submitted by: bde [1] (not exact #ifdefs, but the values)
MFC after: 2 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Correct value for _POSIX_AIO_LISTIO_MAX in <limits.h>.

All the "Minimum Values" (POSIX.1-2008 XBD 13 Headers <limits.h>) are now
correct. These should all be exactly as they are in the specification; the
possibly higher values we support are announced differently.

PR: standards/104743
Submitted by: gcooper
MFC after: 2 weeks

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.

Remove the Berkeley clause 3's.
Add a few $FreeBSD$

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

Deprecate machine/limits.h in favor of new sys/limits.h.
Change all in-tree consumers to include <sys/limits.h>

Discussed on: standards@
Partially submitted by: Craig Rodrigues <rodrigc@attbi.com>

MB_LEN_MAX is not MD, move it to the MI limits.h.

Update limits and configuration parameters for 1003.1/TC1/D6.
Implement new sysconf keys. Change the implenentation of
_SC_ASYNCHRONOUS_IO in preparation for the next set of changes.

Move some limits which had been in <sys/syslimits.h> to <limits.h> where
they belong. They had only ever been in syslimits.h to provide for the
kernel implementation of the CTL_USER MIB branch, which went away with
newsysctl years ago. (There is a #error in <sys/syslimits.h> which I
will downgrade in the next commit.)

Whitespace fixes (mainly for a space instead of a tab after #define).

Use new visibility macros. (1 of 5)

After one too many PRs on the subject, bite the bullet and define IOV_MAX
and its associated constants. Implement _SC_IOV_MAX in the usual way.
Be a bit sloppy about the namespace question; this should get cleared up
in time for 5.0.

MFC after: 1 month

$Id$ -> $FreeBSD$

Finish _POSIX_PRIORITY_SCHEDULING. Needs P1003_1B and
_KPOSIX_PRIORITY_SCHEDULING options to work. Changes:

Change all "posix4" to "p1003_1b". Misnamed files are left
as "posix4" until I'm told if I can simply delete them and add
new ones;

Add _POSIX_PRIORITY_SCHEDULING system calls for FreeBSD and Linux;

Add man pages for _POSIX_PRIORITY_SCHEDULING system calls;

Add options to LINT;

Minor fixes to P1003_1B code during testing.

Remove AIO_LISTIO_MAX until it is done properly.

Reviewed by: bde

Changes to support building with _POSIX_SOURCE set to 199309L:

1. Add sys/_posix.h to handle those preprocessor defs that POSIX
says have effects when defined before including any header files;

2. Change POSIX4_VISIBLE back to _POSIX4_VISIBLE

3. Add _POSIX4_VISIBLE_HISTORICALLY for pre-existing BSD features now
defined in POSIX. These show up when:

_POSIX_SOURCE and _POSIX_C_SOURCE are not set or
_POSIX_C_SOURCE is set >= 199309L

and vanish when:

_POSIX_SOURCE is set or _POSIX_C_SOURCE is < 199309L.

4. Explain these in man 9 posix4;

5. Include _posix.h and conditionalize on new feature test.

Reviewed by: msmith, bde long ago
POSIX.4 headers and sysctl variables. Nothing should change
unless POSIX4 is defined or _POSIX_VERSION is set to 199309.

Don't include sys/syslimits.h if _ANSI_SOURCE is defined.

PR: 5119
Discussed with: Bruce Evans <bde@zeta.org.au>

Fixed some style bugs.

Change XOPEN constants to match FreeBSD reality and add some
comments to describe them

Activate _POSIX_* stuff if !_ANSI_SOURCE
Add _XOPEN constants set, needed mainly to sense position arguments
in printf (vi cares at this moment)
Obtained from: NetBSD

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