yann@2437: ripped from SuSE
yann@2437: 
yann@2437: if /etc/resolv.conf is updated, then make sure applications
yann@2437: already running get the updated information.
yann@2437: 
yann@2437: http://bugs.gentoo.org/177416
yann@2437: 
yann@2437: diff -durN glibc-2.12.1.orig/resolv/res_libc.c glibc-2.12.1/resolv/res_libc.c
yann@2437: --- glibc-2.12.1.orig/resolv/res_libc.c	2009-02-07 05:27:42.000000000 +0100
yann@2437: +++ glibc-2.12.1/resolv/res_libc.c	2009-11-13 00:49:59.000000000 +0100
yann@2437: @@ -22,6 +22,7 @@
yann@2437:  #include <arpa/nameser.h>
yann@2437:  #include <resolv.h>
yann@2437:  #include <bits/libc-lock.h>
yann@2437: +#include <sys/stat.h>
yann@2437:  
yann@2437:  
yann@2437:  /* The following bit is copied from res_data.c (where it is #ifdef'ed
yann@2437: @@ -95,6 +96,20 @@
yann@2437:  __res_maybe_init (res_state resp, int preinit)
yann@2437:  {
yann@2437:  	if (resp->options & RES_INIT) {
yann@2437: +		static time_t last_mtime, last_check;
yann@2437: +		time_t now;
yann@2437: +		struct stat statbuf;
yann@2437: +		
yann@2437: +		time (&now);
yann@2437: +		if (now != last_check) {
yann@2437: +			last_check = now;
yann@2437: +			if (stat (_PATH_RESCONF, &statbuf) == 0 && last_mtime != statbuf.st_mtime) {
yann@2437: +				last_mtime = statbuf.st_mtime;
yann@2437: +				atomicinclock (lock);
yann@2437: +				atomicinc (__res_initstamp);
yann@2437: +				atomicincunlock (lock);
yann@2437: +			}
yann@2437: +		}
yann@2437:  		if (__res_initstamp != resp->_u._ext.initstamp) {
yann@2437:  			if (resp->nscount > 0)
yann@2437:  				__res_iclose (resp, true);