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