Test POSIX 1003.1 2016 chapter 13 "Headers".

And fix one thing that this found: apparently <stdlib.h> should also
make the various *WAIT* macros available.

Bug: N/A
Test: builds
Change-Id: Id879bf3c1bddd1170261a809e7280150a74d6b3d
diff --git a/tests/headers/posix/ftw_h.c b/tests/headers/posix/ftw_h.c
new file mode 100644
index 0000000..0a78d94
--- /dev/null
+++ b/tests/headers/posix/ftw_h.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ftw.h>
+
+#include "header_checks.h"
+
+static void ftw_h() {
+  TYPE(struct FTW);
+  STRUCT_MEMBER(struct FTW, int, base);
+  STRUCT_MEMBER(struct FTW, int, level);
+
+  MACRO(FTW_F);
+  MACRO(FTW_D);
+  MACRO(FTW_DNR);
+  MACRO(FTW_DP);
+  MACRO(FTW_NS);
+  MACRO(FTW_SL);
+  MACRO(FTW_SLN);
+
+  MACRO(FTW_PHYS);
+  MACRO(FTW_MOUNT);
+  MACRO(FTW_DEPTH);
+  MACRO(FTW_CHDIR);
+
+  FUNCTION(ftw, int (*f)(const char*, int (*)(const char*, const struct stat*, int), int));
+
+  TYPE(struct stat);
+
+  // POSIX: "The <ftw.h> header shall define the ... the symbolic names for
+  // st_mode and the file type test macros as described in <sys/stat.h>."
+#include "sys_stat_h_mode_constants.h"
+#include "sys_stat_h_file_type_test_macros.h"
+}