io.sockets.secure.unix: fix socket shutdown handling to make http.client work with https://www.google.com

basis/io/sockets/secure/unix/unix.factor

@@ -1,4 +1,4 @@
-! Copyright (C) 2007, 2010, Slava Pestov, Elie CHAFTARI.
+! Copyright (C) 2007, 2011, Slava Pestov, Elie CHAFTARI.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors unix byte-arrays kernel sequences namespaces
 math math.order combinators init alien alien.c-types
@@ -15,14 +15,18 @@ M: openssl ssl-supported? t ;
 
 M: ssl-handle handle-fd file>> handle-fd ;
 
-: syscall-error ( r -- * )
-    ERR_get_error dup zero? [
-        drop
+: syscall-error ( handle r -- event )
+    nip
+    ERR_get_error [
         {
             { -1 [ errno ECONNRESET = [ premature-close ] [ (io-error) ] if ] }
-            { 0 [ premature-close ] }
+            ! OpenSSL docs say this it is an error condition for
+            ! a server to not send a close notify, but web
+            ! servers in the wild don't seem to do this, for
+            ! example https://www.google.com.
+            { 0 [ f ] }
         } case
-    ] [ nip (ssl-error) ] if ;
+    ] [ nip (ssl-error) ] if-zero ;
 
 : check-accept-response ( handle r -- event )
     over handle>> over SSL_get_error