bzr commit into mysql-trunk branch (alexander.nozdrin:3343)

[Alexander Nozdrin]

#At file:///home/alik/MySQL/bzr/mysql-trunk/ based on revid:gleb.shchepa@stripped

 3343 Alexander Nozdrin	2011-04-08 [merge]
      Merge from mysql-5.5.

    modified:
      include/violite.h
      sql/hostname.cc
      vio/viosocket.c
=== modified file 'include/violite.h'
--- a/include/violite.h	2010-06-07 14:01:39 +0000
+++ b/include/violite.h	2011-04-08 10:23:36 +0000
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 MySQL AB
+/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -93,6 +93,8 @@ ssize_t vio_pending(Vio *vio);
 my_bool vio_get_normalized_ip_string(const struct sockaddr *addr, int addr_length,
                                      char *ip_string, size_t ip_string_size);
 
+my_bool vio_is_no_name_error(int err_code);
+
 int vio_getnameinfo(const struct sockaddr *sa,
                     char *hostname, size_t hostname_size,
                     char *port, size_t port_size,

=== modified file 'sql/hostname.cc'
--- a/sql/hostname.cc	2010-07-23 20:59:42 +0000
+++ b/sql/hostname.cc	2011-04-08 10:32:40 +0000
@@ -1,4 +1,4 @@
-/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
+/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -366,41 +366,35 @@ bool ip_to_hostname(struct sockaddr_stor
   err_code= vio_getnameinfo(ip, hostname_buffer, NI_MAXHOST, NULL, 0,
                             NI_NAMEREQD);
 
-  if (err_code == EAI_NONAME)
+  if (err_code)
   {
-    /*
-      There is no reverse address mapping for the IP address. A host name
-      can not be resolved.
-    */
+    // NOTE: gai_strerror() returns a string ending by a dot.
 
-    DBUG_PRINT("error", ("IP address '%s' could not be resolved: "
-                         "no reverse address mapping.",
-                         (const char *) ip_key));
+    DBUG_PRINT("error", ("IP address '%s' could not be resolved: %s",
+                         (const char *) ip_key,
+                         (const char *) gai_strerror(err_code)));
 
-    sql_print_warning("IP address '%s' could not be resolved: "
-                      "no reverse address mapping.",
-                      (const char *) ip_key);
+    sql_print_warning("IP address '%s' could not be resolved: %s",
+                      (const char *) ip_key,
+                      (const char *) gai_strerror(err_code));
 
-    err_status= add_hostname(ip_key, NULL);
+    if (vio_is_no_name_error(err_code))
+    {
+      /*
+        The no-name error means that there is no reverse address mapping
+        for the IP address. A host name can not be resolved.
+
+        If it is not the no-name error, we should not cache the hostname
+        (or rather its absence), because the failure might be transient.
+      */
 
-    *hostname= NULL;
-    *connect_errors= 0; /* New IP added to the cache. */
+      add_hostname(ip_key, NULL);
 
-    DBUG_RETURN(err_status);
-  }
-  else if (err_code)
-  {
-    DBUG_PRINT("error", ("IP address '%s' could not be resolved: "
-                         "getnameinfo() returned %d.",
-                         (const char *) ip_key,
-                         (int) err_code));
-
-    sql_print_warning("IP address '%s' could not be resolved: "
-                      "getnameinfo() returned error (code: %d).",
-                      (const char *) ip_key,
-                      (int) err_code);
+      *hostname= NULL;
+      *connect_errors= 0; /* New IP added to the cache. */
+    }
 
-    DBUG_RETURN(TRUE);
+    DBUG_RETURN(FALSE);
   }
 
   DBUG_PRINT("info", ("IP '%s' resolved to '%s'.",

=== modified file 'vio/viosocket.c'
--- a/vio/viosocket.c	2010-08-16 12:50:27 +0000
+++ b/vio/viosocket.c	2011-04-08 10:23:36 +0000
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000 MySQL AB
+/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -1059,6 +1059,34 @@ ssize_t vio_pending(Vio *vio)
 }
 
 
+/**
+  Checks if the error code, returned by vio_getnameinfo(), means it was the
+  "No-name" error.
+
+  Windows-specific note: getnameinfo() returns WSANO_DATA instead of
+  EAI_NODATA or EAI_NONAME when no reverse mapping is available at the host
+  (i.e. Windows can't get hostname by IP-address). This error should be
+  treated as EAI_NONAME.
+
+  @return if the error code is actually EAI_NONAME.
+  @retval true if the error code is EAI_NONAME.
+  @retval false otherwise.
+*/
+
+my_bool vio_is_no_name_error(int err_code)
+{
+#ifdef _WIN32
+
+  return err_code == WSANO_DATA || err_code == EAI_NONAME;
+
+#else
+
+  return err_code == EAI_NONAME;
+
+#endif
+}
+
+
 /**
   This is a wrapper for the system getnameinfo(), because different OS
   differ in the getnameinfo() implementation:

No bundle (reason: revision is a merge (you can force generation of a bundle with env var BZR_FORCE_BUNDLE=1)).