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freebsd-dev/lib/libc
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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
..
aarch64 Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
amd64 Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
arm Annotate arm userspace assembler sources stating their tolerance to 2015-09-29 16:09:58 +00:00
capability use .Mt to mark up email addresses consistently (part4) 2014-06-23 08:25:03 +00:00
compat-43 Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:53:24 +00:00
db Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:55:00 +00:00
gdtoa Add missing include to eliminate -Wmissing-prototypes warning 2015-09-20 04:06:04 +00:00
gen wordexp: Rewrite to make WRDE_NOCMD reliable. 2015-09-30 21:32:29 +00:00
gmon Add declaration to eliminate -Wmissing-prototypes warning 2015-09-20 03:59:27 +00:00
i386 Switch libc from using _sig{procmask,action,suspend} symbols, which 2015-08-29 14:25:01 +00:00
iconv Fix improbable memory leak in _citrus_prop_read_str(). 2015-04-20 22:09:50 +00:00
include Switch libc from using _sig{procmask,action,suspend} symbols, which 2015-08-29 14:25:01 +00:00
inet Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:50:56 +00:00
isc Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-23 16:16:16 +00:00
locale Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:50:18 +00:00
md Bring the md5 functions into libc for internal use only. 2014-08-12 12:25:56 +00:00
mips Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
nameser Add missing break. 2014-08-20 14:58:25 +00:00
net - address grammar 2015-10-05 18:09:43 +00:00
nls Use mdoc(7) macros to handle parenthesis 2015-04-26 10:54:52 +00:00
posix1e Remove names from some prototypes 2015-09-20 20:16:34 +00:00
powerpc Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
powerpc64 Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
quad Remove MK_ARM_EABI, the armeb issues have been fixed. The code to support 2014-10-01 08:26:51 +00:00
regex mdoc: rendering fixes 2015-04-26 10:55:39 +00:00
resolv resolver: automatically reload /etc/resolv.conf 2015-10-14 14:26:44 +00:00
rpc Use proper function prototypes. 2015-10-07 19:55:58 +00:00
secure Remove a stale comment and clarify the original where it was taken from 2015-08-14 14:58:04 +00:00
softfloat Replace use of ${.CURDIR} by ${LIBC_SRCTOP} and define ${LIBC_SRCTOP} 2014-03-04 02:19:39 +00:00
sparc64 Add include for declaration of _set_tp(). Eliminates -Wmissing-prototypes warnings. 2015-09-20 04:59:01 +00:00
stdio Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:28:49 +00:00
stdlib Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:24:28 +00:00
stdtime Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:51:52 +00:00
string Add declaration to eliminate -Wmissing-prototypes warning. 2015-09-20 03:51:15 +00:00
sys Change the default setting of kern.ipc.shm_allow_removed from 0 to 1. 2015-10-10 09:29:47 +00:00
tests Refactor the test/ Makefiles after recent changes to bsd.test.mk (r289158) and 2015-10-12 08:16:03 +00:00
uuid Replace use of ${.CURDIR} by ${LIBC_SRCTOP} and define ${LIBC_SRCTOP} 2014-03-04 02:19:39 +00:00
xdr Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:52:13 +00:00
yp Replace use of ${.CURDIR} by ${LIBC_SRCTOP} and define ${LIBC_SRCTOP} 2014-03-04 02:19:39 +00:00
libc.ldscript Attempt to move the POSIX iconv* symbols out of runtime linker space. 2013-11-17 22:52:17 +00:00
Makefile Move the stack protector to a new "secure" directory 2015-08-14 03:03:13 +00:00
Makefile.depend Update META_MODE dependencies. 2015-09-17 05:06:34 +00:00
Versions.def Fix the inheritance of the FBSDprivate_1.0 namespace. 2014-04-03 17:31:38 +00:00