Merge shellback.(none):/home/msvensson/mysql/mysql-5.0

into  shellback.(none):/home/msvensson/mysql/mysql-5.1

sql/field.h

@@ -173,8 +173,9 @@ class Field
   virtual int cmp(const char *,const char *)=0;
   virtual int cmp_binary(const char *a,const char *b, uint32 max_length=~0L)
   { return memcmp(a,b,pack_length()); }
-  int cmp_offset(uint row_offset) { return cmp(ptr,ptr+row_offset); }
-  int cmp_binary_offset(uint row_offset)
+  virtual int cmp_offset(uint row_offset)
+  { return cmp(ptr,ptr+row_offset); }
+  virtual int cmp_binary_offset(uint row_offset)
   { return cmp_binary(ptr, ptr+row_offset); };
   virtual int key_cmp(const byte *a,const byte *b)
   { return cmp((char*) a,(char*) b); }
@@ -1347,6 +1348,8 @@ class Field_bit :public Field {
   { return cmp_binary((char *) a, (char *) b); }
   int key_cmp(const byte *str, uint length);
   int cmp_offset(uint row_offset);
+  int cmp_binary_offset(uint row_offset)
+  { return cmp_offset(row_offset); }
   void get_key_image(char *buff, uint length, imagetype type);
   void set_key_image(char *buff, uint length)
   { Field_bit::store(buff, length, &my_charset_bin); }

sql/net_serv.cc

@@ -208,23 +208,40 @@ my_bool net_realloc(NET *net, ulong length)
   RETURN VALUES
     0	No data to read
     1	Data or EOF to read
+    -1  Don't know if data is ready or not
 */
 
-static my_bool net_data_is_ready(my_socket sd)
+static int net_data_is_ready(my_socket sd)
 {
+#ifdef HAVE_POLL
+  struct pollfd ufds;
+  int res;
+
+  ufds.fd= sd;
+  ufds.events= POLLIN | POLLPRI;
+  if (!(res= poll(&ufds, 1, 0)))
+    return 0;
+  if (res < 0 || !(ufds.revents & (POLLIN | POLLPRI)))
+    return 0;
+  return 1;
+#else
   fd_set sfds;
   struct timeval tv;
   int res;
 
+  if (sd >= FD_SETSIZE)
+    return -1;
+
   FD_ZERO(&sfds);
   FD_SET(sd, &sfds);
 
   tv.tv_sec= tv.tv_usec= 0;
 
   if ((res= select(sd+1, &sfds, NULL, NULL, &tv)) < 0)
-    return FALSE;
+    return 0;
   else
     return test(res ? FD_ISSET(sd, &sfds) : 0);
+#endif
 }
 
 
@@ -251,10 +268,10 @@ static my_bool net_data_is_ready(my_socket sd)
 
 void net_clear(NET *net)
 {
-  int count;
+  int count, ready;
   DBUG_ENTER("net_clear");
 #if !defined(EMBEDDED_LIBRARY)
-  while(net_data_is_ready(net->vio->sd))
+  while((ready= net_data_is_ready(net->vio->sd)) != 0)
   {
     /* The socket is ready */
     if ((count= vio_read(net->vio, (char*) (net->buff),
@@ -269,6 +286,10 @@ void net_clear(NET *net)
     }
     else
     {
+      /* No data to read and 'net_data_is_ready' returned "don't know" */
+      if (ready == -1)
+        break;
+
       DBUG_PRINT("info",("socket ready but only EOF to read - disconnected"));
       net->error= 2;
       break;