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diff --git a/support/check_mem_access.h b/support/check_mem_access.h
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+/* Test verification functions for memory access checks.
+   Copyright (C) 2025 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
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_CHECK_MEM_ACCESS_H
+#define SUPPORT_CHECK_MEM_ACCESS_H
+
+#include <stdbool.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* To check if the a memory region is inaccessible, this function tries
+   read / write on the provided address ADDR and checks if a SIGSEGV is
+   generated.  This function is not thread-safe and it changes signal
+   handlers for SIGSEGV and SIGBUS.
+   If WRITE is true, only the write operation is checked, otherwise only
+   the read operation is checked. */
+bool check_mem_access (const void *addr, bool write);
+
+__END_DECLS
+
+#endif // SUPPORT_CHECK_MEM_ACCESS_H