Revision: miles@gnu.org--gnu-2005/gnus--devo--0--patch-151

[gnus] / lisp / dns.el

diff --git a/lisp/dns.el b/lisp/dns.el
index 8b84e17..e5a30ec 100644 (file)
--- a/lisp/dns.el
+++ b/lisp/dns.el
@@ -18,8 +18,8 @@
 
 ;; You should have received a copy of the GNU General Public License
 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -348,6 +348,18 @@ If TCP-P, the first two bytes of the package with be the length field."
         ;; connection to the DNS server.
         (open-network-stream "dns" (current-buffer) server "domain")))))
 
+(defvar dns-cache (make-vector 4096 0))
+
+(defun query-dns-cached (name &optional type fullp reversep)
+  (let* ((key (format "%s:%s:%s:%s" name type fullp reversep))
+        (sym (intern-soft key dns-cache)))
+    (if (and sym
+            (boundp sym))
+       (symbol-value sym)
+      (let ((result (query-dns name type fullp reversep)))
+       (set (intern key dns-cache) result)
+       result))))
+
 (defun query-dns (name &optional type fullp reversep)
   "Query a DNS server for NAME of TYPE.
 If FULLP, return the entire record returned.
@@ -386,6 +398,7 @@ If REVERSEP, look up an IP address."
                      tcp-p))
          (while (and (zerop (buffer-size))
                      (> times 0))
+           (sit-for (/ step 1000.0))
            (accept-process-output process 0 step)
            (decf times step))
          (ignore-errors