Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/sql/thr_malloc.cc b/sql/thr_malloc.cc
new file mode 100644
index 00000000..89ad359b
--- /dev/null
+++ b/sql/thr_malloc.cc
@@ -0,0 +1,98 @@
+/*
+   Copyright (c) 2000, 2010, Oracle and/or its affiliates.
+
+   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
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+
+/* Mallocs for used in threads */
+
+#include "mariadb.h"
+#include "sql_priv.h"
+#include "unireg.h"
+#include "thr_malloc.h"
+#include "sql_class.h"
+
+extern "C" {
+  void sql_alloc_error_handler(void)
+  {
+    THD *thd= current_thd;
+    if (likely(thd))
+    {
+      if (! thd->is_error())
+      {
+        /*
+          This thread is Out Of Memory.
+          An OOM condition is a fatal error.
+          It should not be caught by error handlers in stored procedures.
+          Also, recording that SQL condition in the condition area could
+          cause more memory allocations, which in turn could raise more
+          OOM conditions, causing recursion in the error handling code itself.
+          As a result, my_error() should not be invoked, and the
+          thread diagnostics area is set to an error status directly.
+          Note that Diagnostics_area::set_error_status() is safe,
+          since it does not call any memory allocation routines.
+          The visible result for a client application will be:
+          - a query fails with an ER_OUT_OF_RESOURCES error,
+          returned in the error packet.
+          - SHOW ERROR/SHOW WARNINGS may be empty.
+        */
+        thd->get_stmt_da()->set_error_status(ER_OUT_OF_RESOURCES);
+      }
+    }
+
+    /* Skip writing to the error log to avoid mtr complaints */
+    DBUG_EXECUTE_IF("simulate_out_of_memory", return;);
+
+    sql_print_error("%s", ER_THD_OR_DEFAULT(thd, ER_OUT_OF_RESOURCES));
+  }
+}
+
+void init_sql_alloc(PSI_memory_key key, MEM_ROOT *mem_root, uint block_size,
+                    uint pre_alloc, myf my_flags)
+{
+  init_alloc_root(key, mem_root, block_size, pre_alloc, my_flags);
+  mem_root->error_handler=sql_alloc_error_handler;
+}
+
+
+char *sql_strmake_with_convert(THD *thd, const char *str, size_t arg_length,
+			       CHARSET_INFO *from_cs,
+			       size_t max_res_length,
+			       CHARSET_INFO *to_cs, size_t *result_length)
+{
+  char *pos;
+  size_t new_length= to_cs->mbmaxlen*arg_length;
+  max_res_length--;				// Reserve place for end null
+
+  set_if_smaller(new_length, max_res_length);
+  if (!(pos= (char*) thd->alloc(new_length + 1)))
+    return pos;					// Error
+
+  if ((from_cs == &my_charset_bin) || (to_cs == &my_charset_bin))
+  {
+    // Safety if to_cs->mbmaxlen > 0
+    new_length= MY_MIN(arg_length, max_res_length);
+    memcpy(pos, str, new_length);
+  }
+  else
+  {
+    uint dummy_errors;
+    new_length= copy_and_convert((char*) pos, new_length, to_cs, str,
+				 arg_length, from_cs, &dummy_errors);
+  }
+  pos[new_length]= 0;
+  *result_length= new_length;
+  return pos;
+}
+