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diff --git a/elf/dl-tunable-types.h b/elf/dl-tunable-types.h
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+/* Tunable type information.
+
+ Copyright (C) 2016-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _TUNABLE_TYPES_H_
+# define _TUNABLE_TYPES_H_
+#include <stddef.h>
+
+typedef enum
+{
+ TUNABLE_TYPE_INT_32,
+ TUNABLE_TYPE_UINT_64,
+ TUNABLE_TYPE_SIZE_T,
+ TUNABLE_TYPE_STRING
+} tunable_type_code_t;
+
+typedef struct
+{
+ tunable_type_code_t type_code;
+ int64_t min;
+ int64_t max;
+} tunable_type_t;
+
+typedef union
+{
+ int64_t numval;
+ const char *strval;
+} tunable_val_t;
+
+typedef void (*tunable_callback_t) (tunable_val_t *);
+
+/* Security level for tunables. This decides what to do with individual
+ tunables for AT_SECURE binaries. */
+typedef enum
+{
+ /* Erase the tunable for AT_SECURE binaries so that child processes don't
+ read it. */
+ TUNABLE_SECLEVEL_SXID_ERASE = 0,
+ /* Ignore the tunable for AT_SECURE binaries, but don't erase it, so that
+ child processes can read it. */
+ TUNABLE_SECLEVEL_SXID_IGNORE = 1,
+ /* Read the tunable. */
+ TUNABLE_SECLEVEL_NONE = 2,
+} tunable_seclevel_t;
+
+
+#endif