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60b27ebb25
freebsd-skq/lib
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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
..
atf Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
clang Use -fpermissive if compiling with GCC. 2015-10-08 00:48:29 +00:00
csu Annotate arm userspace assembler sources stating their tolerance to 2015-09-29 16:09:58 +00:00
libalias Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libarchive Integrate the tests from lib/libarchive, usr.bin/cpio, and usr.bin/tar in to 2015-10-12 18:31:21 +00:00
libauditd Add META_MODE support. 2015-06-13 19:20:56 +00:00
libbegemot new depends 2015-06-16 23:37:19 +00:00
libblocksruntime META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libbluetooth Add META_MODE support. 2015-06-13 19:20:56 +00:00
libbsdstat
libbsm Add META_MODE support. 2015-06-13 19:20:56 +00:00
libbsnmp Add META_MODE support. 2015-06-13 19:20:56 +00:00
libbz2 Add META_MODE support. 2015-06-13 19:20:56 +00:00
libc resolver: automatically reload /etc/resolv.conf 2015-10-14 14:26:44 +00:00
libc_nonshared Add META_MODE support. 2015-06-13 19:20:56 +00:00
libc++ Stop linking libc++.so verbosely, there is no need to. 2015-10-06 21:28:54 +00:00
libcalendar Add META_MODE support. 2015-06-13 19:20:56 +00:00
libcam Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libcapsicum Let the nv.h and dnv.h includes be only in sys directory. 2015-07-02 21:58:10 +00:00
libcasper Let the nv.h and dnv.h includes be only in sys directory. 2015-07-02 21:58:10 +00:00
libclang_rt Amend 287626 by adding lib/libclang_rt/safestack. 2015-09-10 20:37:00 +00:00
libcom_err new depends 2015-06-16 23:37:19 +00:00
libcompat Add META_MODE support. 2015-06-13 19:20:56 +00:00
libcompiler_rt Merge ^/head r288197 through r288456. 2015-10-01 19:02:45 +00:00
libcrypt Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libcuse META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libcxxrt Add std::uncaught_exceptions() to libcxxrt (C++17, see N4152 and N4259). 2015-10-05 17:47:23 +00:00
libdevctl Add a new device control utility for new-bus devices called devctl. This 2015-02-06 16:09:01 +00:00
libdevinfo Add META_MODE support. 2015-06-13 19:20:56 +00:00
libdevstat Add META_MODE support. 2015-06-13 19:20:56 +00:00
libdpv Add META_MODE support. 2015-06-13 19:20:56 +00:00
libdwarf new depends 2015-06-16 23:37:19 +00:00
libedit Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libefi
libelf Add META_MODE support. 2015-06-13 19:20:56 +00:00
libelftc Pay attention to MK_ELFTOOLCHAIN_TOOLS so we build the desired tools. 2015-06-15 20:11:15 +00:00
libevent META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libexecinfo Add META_MODE support. 2015-06-13 19:20:56 +00:00
libexpat Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libfetch Fix non-POSIX-compliant use of getaddrinfo in libfetch 2015-09-25 14:24:23 +00:00
libfigpar Add META_MODE support. 2015-06-13 19:20:56 +00:00
libgeom Plug memory leaks when running out of memory. 2015-08-28 06:41:40 +00:00
libgpib META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libgpio Bump .Dd for the example code update. 2015-07-01 16:50:01 +00:00
libgssapi Add META_MODE support. 2015-06-13 19:20:56 +00:00
libiconv_modules META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libipsec New AES modes for IPSec, user space components. 2015-07-03 20:09:14 +00:00
libjail Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libkiconv Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libkvm Add support to libkvm for reading minidumps on arm64. The kernel side is 2015-08-20 11:07:51 +00:00
libldns new depends 2015-06-16 23:37:19 +00:00
liblzma Replace beforeinstall: handling with FILES. 2015-09-18 23:49:32 +00:00
libmagic MFV r288140: update file to 5.25. 2015-09-23 05:39:20 +00:00
libmd Add new include path for sha256.h 2015-07-12 03:39:36 +00:00
libmemstat Add META_MODE support. 2015-06-13 19:20:56 +00:00
libmilter META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libmp Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libmt Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libnandfs
libnetbsd Add META_MODE support. 2015-06-13 19:20:56 +00:00
libnetgraph Add META_MODE support. 2015-06-13 19:20:56 +00:00
libngatm Add META_MODE support. 2015-06-13 19:20:56 +00:00
libnv Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libohash Include stddef.h for ptrdiff_t 2015-10-03 20:06:50 +00:00
libopie new depends 2015-06-16 23:37:19 +00:00
libpam Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libpcap Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libpjdlog Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libpmc Add META_MODE support. 2015-06-13 19:20:56 +00:00
libproc Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libprocstat Fix core corruption caused by race in note_procstat_vmmap 2015-10-06 18:07:00 +00:00
libradius new depends 2015-06-16 23:37:19 +00:00
librpcsec_gss META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
librpcsvc Add META_MODE support. 2015-06-13 19:20:56 +00:00
librt Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
librtld_db Add META_MODE support. 2015-06-13 19:20:56 +00:00
libsbuf new depends 2015-06-16 23:37:19 +00:00
libsdp Add META_MODE support. 2015-06-13 19:20:56 +00:00
libsm Update META_MODE dependencies. 2015-09-17 05:06:34 +00:00
libsmb META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libsmdb Add META_MODE support. 2015-06-13 19:20:56 +00:00
libsmutil Add META_MODE support. 2015-06-13 19:20:56 +00:00
libsqlite3 Move the USE_PREAD configuration knob out of the middle of the autoconf 2015-08-09 05:54:53 +00:00
libstand If we can't open the file, skip devclose() for the exclusive_file_system 2015-10-08 17:59:05 +00:00
libstdbuf META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libstdthreads META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libtacplus Add META_MODE support. 2015-06-13 19:20:56 +00:00
libtelnet Add META_MODE support. 2015-06-13 19:20:56 +00:00
libthr Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libthread_db new depends 2015-06-16 23:37:19 +00:00
libucl Add META_MODE support. 2015-06-13 19:20:56 +00:00
libufs Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libugidfw Fix 'ugidfw remove' after r284251 incorrectly changed it. 2015-09-29 18:48:12 +00:00
libulog Revert r284417 it is not necessary anymore 2015-06-15 19:28:07 +00:00
libunbound META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libusb Remove redundant COMPAT_32BIT guard on pkgconfig files. This is already handled 2015-10-03 16:34:21 +00:00
libusbhid Add META_MODE support. 2015-06-13 19:20:56 +00:00
libutil Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
libvgl META_MODE: Remove DEP_RELDIR from Makefile.depend files. 2015-09-25 19:26:08 +00:00
libvmmapi Move the 'devmem' device nodes from /dev/vmm to /dev/vmm.io 2015-07-06 19:41:43 +00:00
libwrap Add META_MODE support. 2015-06-13 19:20:56 +00:00
libxo Move SHLIBDIR?=/lib before <src.opts.mk> so that it works again. 2015-10-08 01:17:45 +00:00
liby Add META_MODE support. 2015-06-13 19:20:56 +00:00
libypclnt new depends 2015-06-16 23:37:19 +00:00
libz Remove redundant COMPAT_32BIT guard on pkgconfig files. This is already handled 2015-10-03 16:34:21 +00:00
msun Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
ncurses Add missing CLEANFILES. 2015-09-26 01:04:52 +00:00
tests Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
Makefile Roll WITHOUT_ELFTOOLCHAIN_TOOLS into WITHOUT_TOOLCHAIN 2015-08-13 17:50:47 +00:00
Makefile.inc