Post-merge fixes for Bug 35103

libmysql/libmysql.c:
  Manual merge
sql/sql_class.cc:
  Don't send anything back to the client if disabled.
sql/sql_prepare.cc:
  Don't send any packet back for statement close.
tests/mysql_client_test.c:
  Manual merge

libmysql/libmysql.c

@@ -4751,7 +4751,7 @@ int STDCALL mysql_stmt_store_result(MYSQL_STMT *stmt)
   if (!mysql)
   {
     /* mysql can be reset in mysql_close called from mysql_reconnect */
-    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate);
+    set_stmt_error(stmt, CR_SERVER_LOST, unknown_sqlstate, NULL);
     DBUG_RETURN(1);
   }
 

sql/sql_class.cc

@@ -395,8 +395,11 @@ Diagnostics_area::set_ok_status(THD *thd, ha_rows affected_rows_arg,
 {
   DBUG_ASSERT(! is_set());
 #ifdef DBUG_OFF
-  /* In production, refuse to overwrite an error with an OK packet. */
-  if (is_error())
+  /*
+    In production, refuse to overwrite an error or a custom response
+    with an OK packet.
+  */
+  if (is_error() || is_disabled())
     return;
 #endif
   /** Only allowed to report success if has not yet reported an error */
@@ -424,8 +427,11 @@ Diagnostics_area::set_eof_status(THD *thd)
 
   DBUG_ASSERT(! is_set());
 #ifdef DBUG_OFF
-  /* In production, refuse to overwrite an error with an EOF packet. */
-  if (is_error())
+  /*
+    In production, refuse to overwrite an error or a custom response
+    with an EOF packet.
+  */
+  if (is_error() || is_disabled())
     return;
 #endif
 
@@ -454,6 +460,14 @@ Diagnostics_area::set_error_status(THD *thd, uint sql_errno_arg,
     an error can happen during the flush.
   */
   DBUG_ASSERT(! is_set() || can_overwrite_status);
+#ifdef DBUG_OFF
+  /*
+    In production, refuse to overwrite a custom response with an
+    ERROR packet.
+  */
+  if (is_disabled())
+    return;
+#endif
 
   m_sql_errno= sql_errno_arg;
   strmake(m_message, message_arg, sizeof(m_message) - 1);

sql/sql_prepare.cc

@@ -2555,6 +2555,8 @@ void mysql_stmt_close(THD *thd, char *packet)
   Prepared_statement *stmt;
   DBUG_ENTER("mysql_stmt_close");
 
+  thd->main_da.disable_status();
+
   if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_close")))
     DBUG_VOID_RETURN;
 
@@ -2566,8 +2568,6 @@ void mysql_stmt_close(THD *thd, char *packet)
   (void) stmt->deallocate();
   general_log_print(thd, thd->command, NullS);
 
-  thd->main_da.disable_status();
-
   DBUG_VOID_RETURN;
 }
 

tests/mysql_client_test.c

@@ -12016,6 +12016,7 @@ static void test_bug5194()
 
     rc= mysql_stmt_execute(stmt);
     check_execute(stmt, rc);
+    mysql_stmt_reset(stmt);
   }
 
   mysql_stmt_close(stmt);
@@ -16600,7 +16601,10 @@ static void test_bug27592()
   DBUG_VOID_RETURN;
 }
 
-#if 0
+
+/**
+  Bug#29948 autoreconnect + prepared statements + kill seems unstable
+*/
 
 static void test_bug29948()
 {
@@ -16615,6 +16619,9 @@ static void test_bug29948()
   int buf;
   unsigned long length, cursor_type;
 
+  DBUG_ENTER("test_bug29948");
+  myheader("test_bug29948");
+
   dbc = mysql_init(NULL);
   DIE_UNLESS(dbc);
 
@@ -16650,7 +16657,7 @@ static void test_bug29948()
   res= mysql_stmt_attr_set(stmt, STMT_ATTR_CURSOR_TYPE, (void *)&cursor_type);
   myquery(res);
 
-  query= "SELECT * from t1 where a=?";
+  query= "SELECT * FROM t1 WHERE a=?";
   res= mysql_stmt_prepare(stmt, query, strlen(query));
   myquery(res);
 
@@ -16663,19 +16670,22 @@ static void test_bug29948()
   res= mysql_stmt_bind_result(stmt,&bind);
   check_execute(stmt, res);
 
-  sprintf(kill_buf, "kill %ld", dbc->thread_id);
-  mysql_query(dbc, kill_buf);
+  my_snprintf(kill_buf, sizeof(kill_buf), "KILL %ld", dbc->thread_id);
+  res= mysql_query(dbc, kill_buf);
+  myquery(res);
 
   res= mysql_stmt_store_result(stmt);
   DIE_UNLESS(res);
 
   mysql_stmt_free_result(stmt);
   mysql_stmt_close(stmt);
-  mysql_query(dbc, "DROP TABLE t1");
+
+  res= mysql_query(dbc, "DROP TABLE t1");
+  myquery(res);
+
   mysql_close(dbc);
 }
 
-#endif
 
 /*
   Bug#29687 mysql_stmt_store_result memory leak in libmysqld
@@ -17715,7 +17725,7 @@ static struct my_tests_st my_tests[]= {
   { "test_bug28505", test_bug28505 },
   { "test_bug28934", test_bug28934 },
   { "test_bug27592", test_bug27592 },
-  /* { "test_bug29948", test_bug29948 }, */
+  { "test_bug29948", test_bug29948 },
   { "test_bug29687", test_bug29687 },
   { "test_bug29692", test_bug29692 },
   { "test_bug29306", test_bug29306 },