+ int __flag, int __crlf_is_lf, int nvars,
+ char * const vars[]);
+
+/* Walk the whole table calling the callback on each element */
+extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
+
+/* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
+#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
+#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */
+#define H_INTERACTIVE (1 << 2) /* indicate that an import is user directed */
+#define H_HIDE_DOT (1 << 3) /* don't print env vars that begin with '.' */
+#define H_MATCH_KEY (1 << 4) /* search/grep key = variable names */
+#define H_MATCH_DATA (1 << 5) /* search/grep data = variable values */
+#define H_MATCH_BOTH (H_MATCH_KEY | H_MATCH_DATA) /* search/grep both */
+#define H_MATCH_IDENT (1 << 6) /* search for indentical strings */
+#define H_MATCH_SUBSTR (1 << 7) /* search for substring matches */
+#define H_MATCH_REGEX (1 << 8) /* search for regular expression matches */
+#define H_MATCH_METHOD (H_MATCH_IDENT | H_MATCH_SUBSTR | H_MATCH_REGEX)
+#define H_PROGRAMMATIC (1 << 9) /* indicate that an import is from setenv() */
+#define H_ORIGIN_FLAGS (H_INTERACTIVE | H_PROGRAMMATIC)