(slightly out of topic) libresolv

Hi, Today I became curious of something that is completely trivial but perhaps very educational... Anybody knows if libresolv checks up the nameservers in /etc/resolv.conf everytime somebody calls gethostbyname or any other call of the family or if it has some sort of smart routine, like to make this smarter it only parses /etc/resolv.conf if its mtime has changed...