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diff --git a/test/tmpdir.h b/test/tmpdir.h
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+/* tmpdir.h -- fixture to create a temporary directory
+ * Copyright (C) 2014  Galois, Inc.
+ *
+ * This library 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 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * To contact Galois, complete the Web form at
+ * <http://corp.galois.com/contact/> or write to Galois, Inc., 421 Southwest
+ * 6th Avenue, Suite 300, Portland, Oregon, 97204-1622.
+ *
+ *
+ * This fixture creates and cleans a temporary subdirectory of the current
+ * directory.  While the subdirectory is active, you can call 'tmpdir_name' to
+ * get its name. */
+
+#ifndef PPAML_TRACER_TEST_TMPDIR_H
+#define PPAML_TRACER_TEST_TMPDIR_H
+
+#ifdef HAVE_CONFIG_H
+#	include <config.h>
+#endif
+
+#include <check.h>
+
+#define HAVE_FIXTURE_tmpdir (HAVE_STRUCT_FTW && HAVE_MKDTEMP && HAVE_NFTW)
+
+#if HAVE_FIXTURE_tmpdir
+	void tmpdir_make();
+	void tmpdir_clean();
+
+	/* Returns the name of the currently-active temporary directory.  If no
+	 * directory is active, returns NULL. */
+	const char *tmpdir_name();
+
+	// Registers the fixture.
+	inline void tmpdir_add_checked(TCase *const tc) {
+		tcase_add_checked_fixture(tc, tmpdir_make, tmpdir_clean);
+	}
+#endif
+
+#endif