Devin Teske 3fe5961a0b Add sysconf(8) and libbsdconf(3)
Complete the native configuration trinity: sysctl(8) for live kernel
state, sysrc(8) for rc.conf(5), and sysconf(8) for the remaining base
configuration -- loader.conf(5), sysctl.conf(5), and the make.conf(5)
family -- atop libbsdconf(3).

libbsdconf resurrects figpar as a unified reader/writer.  Callbacks own
semantics; statements may span multiple lines via backslash continuation;
non-seekable input is spooled; writes are atomic (mkstemp, fsync, rename)
with mode/owner preservation.  Format descriptors name each target, its
files, and quoting rules without private parsers.  Multi-file targets
follow boot sourcing order; loader chases loader_conf_files as the boot
loader does.

sysconf(8) is the operator-facing tool: name / name=value on a required
target, sysrc-style list edits, make append and list-strike where they
belong, jail/altroot, and a capsicum sandbox for read-only use.

Sysctl writes validate against the running kernel first -- unknown and
read-only OIDs, CTLFLAG_TUN (pointing at the loader target), and CTLTYPE
range checks -- so a typo or overflow does not land in sysctl.conf.

Make and src treat WITH_/WITHOUT_ as presence knobs (as bsd.mkopt.mk /
src.conf(5) do) and warn on the WITH_*=no form that does not disable the
option, so a bad assignment is caught before an /usr/src build surfaces
it.

The rc target passes through to sysrc(8).

Defaults querying (-d/-D/-A) mirrors sysrc for dumps and descriptions on
targets that have a defaults file; named reads already see defaults, and
-A only widens dump scope.

Manuals are split pkg(8)-style (bsdconf/put/format; sysconf plus
per-target pages).  ATF coverage exercises the frontend.

Co-authored-by:	Faraz Vahedi <[email protected]>
Reviewed by:	fuz, kfv
Differential Revision:	https://reviews.freebsd.org/D58066
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FreeBSD Source:

This is the top level of the FreeBSD source directory.

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.

For information on the CPU architectures and platforms supported by FreeBSD, see the FreeBSD website's Platforms page.

For official FreeBSD bootable images, see the release page.

Source Roadmap:

Directory Description
bin System/user commands.
cddl Source code for third-party software under the Common Development and Distribution License.
contrib Source code for third-party software.
crypto Source code for cryptographic libraries and commands (see crypto/README).
etc Template files for /etc.
include System include files.
kerberos5 Build system for Kerberos 5 (Heimdal).
krb5 Build system for Kerberos 5 (MIT).
lib System libraries.
libexec System commands intended to be executed by other commands or daemons.
packages Base system packages.
release Makefiles and scripts used for building releases and VM images.
rescue Build system for statically linked /rescue commands.
sbin System commands.
secure Build system for cryptographic libraries and commands (excluding Kerberos).
share Shared resources.
stand Boot loader sources.
sys Kernel sources (see sys/README.md).
targets Support for experimental DIRDEPS_BUILD
tests Tests which can be run by Kyua. See tests/README for additional information.
tools Ancillary utilities and tests (not included in the build).
usr.bin User commands.
usr.sbin System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.

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