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--- /dev/null
+++ b/lib/resource-ext.h
@@ -0,0 +1,38 @@
+/* Extra functions for resource usage.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2011.
+
+   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; either version 3 of the License, or
+   (at your option) any later version.
+
+   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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _RESOURCE_EXT_H
+#define _RESOURCE_EXT_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Returns the amount of address space currently in use by the current
+   process, or zero if unknown.
+   This is the quantity which is limited by setrlimit(RLIMIT_AS,...).  */
+extern uintptr_t get_rusage_as (void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RESOURCE_EXT_H */