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Eric van Gyzen 60b27ebb25 resolver: automatically reload /etc/resolv.conf
On each resolver query, use stat(2) to see if the modification time
of /etc/resolv.conf has changed.  If so, reload the file and reinitialize
the resolver library.  However, only call stat(2) if at least two seconds
have passed since the last call to stat(2), since calling it on every
query could kill performance.

This new behavior is enabled by default.  Add a "reload-period" option
to disable it or change the period of the test.

Document this behavior and option in resolv.conf(5).

Polish the man page just enough to appease igor.

https://lists.freebsd.org/pipermail/freebsd-arch/2015-October/017342.html

Reviewed by:	kp, wblock
Discussed with:	jilles, imp, alfred
MFC after:	1 month
Relnotes:	yes
Sponsored by:	Dell Inc.
Differential Revision:	https://reviews.freebsd.org/D3867
2015-10-14 14:26:44 +00:00
bin Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
cddl MFV r289311: 5764 "zfs send -nv" directs output to stderr 2015-10-14 11:52:58 +00:00
contrib Add llvm patch corresponding to r289221. 2015-10-13 16:25:02 +00:00
crypto Fix OpenSSH multiple vulnerabilities by backporting three changes 2015-08-25 20:48:37 +00:00
etc Integrate tools/regression/vfs into the FreeBSD test suite as tests/sys/vfs 2015-10-14 08:16:15 +00:00
gnu Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
include resolver: automatically reload /etc/resolv.conf 2015-10-14 14:26:44 +00:00
kerberos5 Partially revert r288266: Remove SUBDIR_PARALLEL from kerberos5/lib. 2015-10-13 18:52:56 +00:00
lib resolver: automatically reload /etc/resolv.conf 2015-10-14 14:26:44 +00:00
libexec Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
release Use print as a function, not operator. 2015-10-08 03:28:15 +00:00
rescue META_MODE: Remove DEP_MACHINE from Makefile.depend files. 2015-09-25 19:44:01 +00:00
sbin Replace references to /dev/acd0 with /dev/cd0 2015-10-13 17:14:27 +00:00
secure Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
share resolver: automatically reload /etc/resolv.conf 2015-10-14 14:26:44 +00:00
sys MFV r289308: 6267 dn_bonus evicted too early 2015-10-14 10:38:05 +00:00
targets All the games moved to usr.bin/ in r288485. 2015-10-02 17:58:16 +00:00
tests Integrate tools/regression/vfs into the FreeBSD test suite as tests/sys/vfs 2015-10-14 08:16:15 +00:00
tools Integrate tools/regression/vfs into the FreeBSD test suite as tests/sys/vfs 2015-10-14 08:16:15 +00:00
usr.bin Simplify syscall generation and ABI source file handling for the build. 2015-10-13 18:23:51 +00:00
usr.sbin Use chroot(2) instead of using prefixes for files. 2015-10-13 22:55:17 +00:00
.arcconfig Add repository.callsign, to help arcanist figure out what repo it's 2015-07-02 22:23:52 +00:00
.arclint phabricator related changes: 2015-04-20 20:33:22 +00:00
COPYRIGHT Bump copyright year. 2014-12-31 10:00:43 +00:00
LOCKS
MAINTAINERS Remove cokane@ from MAINTAINERS for 3dfx(4)/tdfx(4) because their email 2014-11-25 05:25:12 +00:00
Makefile Add installconfig as a top level target 2015-10-09 22:14:07 +00:00
Makefile.inc1 Fix installing config files as non root 2015-10-10 14:43:46 +00:00
ObsoleteFiles.inc Update dates in UPDATING and ObsoleteFiles.inc. 2015-10-06 16:26:07 +00:00
README README: changes and fixups 2015-04-19 07:16:44 +00:00
UPDATING Rewrap UPDATING entry from r265422 to 80 columns 2015-10-13 12:51:44 +00:00

This is the top level of the FreeBSD source directory.  This file
was last revised on:
$FreeBSD$

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)
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html
for more information, including setting make(1) variables.

The `buildkernel` and `installkernel` targets build and install
the kernel and the modules (see below).  Please see the top of
the Makefile in this directory for more information on the
standard build targets and compile-time flags.

Building a kernel is a somewhat more involved process.  See build(7), config(8),
and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html
for more information.

Note: If you want to build and install the kernel with the
`buildkernel` and `installkernel` targets, you might need to build
world before.  More information is available in the handbook.

The kernel configuration files reside in the sys/<arch>/conf
sub-directory.  GENERIC is the default configuration used in release builds.
NOTES contains entries and documentation for all possible
devices, not just those commonly used.


Source Roadmap:
---------------

bin		System/user commands.

cddl		Various commands and libraries under the Common Development
		and Distribution License.

contrib		Packages contributed by 3rd parties.

crypto		Cryptography stuff (see crypto/README).

etc		Template files for /etc.

games		Amusements.

gnu		Various commands and libraries under the GNU Public License.
		Please see gnu/COPYING* for more information.

include		System include files.

kerberos5	Kerberos5 (Heimdal) package.

lib		System libraries.

libexec		System daemons.

release		Release building Makefile & associated tools.

rescue		Build system for statically linked /rescue utilities.

sbin		System commands.

secure		Cryptographic libraries and commands.

share		Shared resources.

sys		Kernel sources.

tests		Regression tests which can be run by Kyua.  See tests/README
		for additional information.

tools		Utilities for regression testing and miscellaneous tasks.

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:

  http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html