---
 misc/sys/queue.h |   37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

--- a/misc/sys/queue.h
+++ b/misc/sys/queue.h
@@ -32,6 +32,8 @@
 #ifndef	_SYS_QUEUE_H_
 #define	_SYS_QUEUE_H_
 
+#include <sys/cdefs.h>
+
 /*
  * This file defines five types of data structures: singly-linked lists,
  * lists, simple queues, tail queues, and circular queues.
@@ -136,6 +138,11 @@
 		(var);							\
 		(var) = ((var)->field.le_next))
 
+#define	LIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = ((head)->lh_first);				\
+	    (var) && ((tvar) = ((var)->field.le_next), 1);		\
+	    (var) = (tvar))
+
 /*
  * List access methods.
  */
@@ -197,6 +204,16 @@
 #define	SLIST_FOREACH(var, head, field)					\
 	for((var) = (head)->slh_first; (var); (var) = (var)->field.sle_next)
 
+#define	SLIST_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = SLIST_FIRST((head));				\
+	    (var) && ((tvar) = SLIST_NEXT((var), field), 1);		\
+	    (var) = (tvar))
+
+#define	SLIST_FOREACH_PREVPTR(var, varp, head, field)			\
+	for ((varp) = &SLIST_FIRST((head));				\
+	    ((var) = *(varp)) != NULL;					\
+	    (varp) = &SLIST_NEXT((var), field))
+
 /*
  * Singly-linked List access methods.
  */
@@ -253,6 +270,11 @@
 		(head)->stqh_last = &(head)->stqh_first;			\
 } while (/*CONSTCOND*/0)
 
+#define	STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do {			\
+	if (((head)->stqh_first = ((elm)->field.stqe_next)) == NULL)	\
+		(head)->stqh_last = &((head)->stqh_first);		\
+} while (/*CONSTCOND*/0)
+
 #define	STAILQ_REMOVE(head, elm, type, field) do {			\
 	if ((head)->stqh_first == (elm)) {				\
 		STAILQ_REMOVE_HEAD((head), field);			\
@@ -271,6 +293,11 @@
 		(var);							\
 		(var) = ((var)->field.stqe_next))
 
+#define	STAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = ((head)->stqh_first);				\
+	    (var) && ((tvar) = ((var)->field.stqe_next), 1);		\
+	    (var) = (tvar))
+
 #define	STAILQ_CONCAT(head1, head2) do {				\
 	if (!STAILQ_EMPTY((head2))) {					\
 		*(head1)->stqh_last = (head2)->stqh_first;		\
@@ -437,11 +464,21 @@
 		(var);							\
 		(var) = ((var)->field.tqe_next))
 
+#define	TAILQ_FOREACH_SAFE(var, head, field, tvar)			\
+	for ((var) = ((head)->tqh_first);				\
+	    (var) && ((tvar) = ((var)->field.tqe_next), 1);		\
+	    (var) = (tvar))
+
 #define	TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
 	for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last));	\
 		(var);							\
 		(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))
 
+#define	TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, tvar)	\
+	for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last));	\
+	    (var) && ((tvar) = (*(((struct headname *)((elm)->field.tqe_prev))->tqh_last)), 1);	\
+	    (var) = (tvar))
+
 #define	TAILQ_CONCAT(head1, head2, field) do {				\
 	if (!TAILQ_EMPTY(head2)) {					\
 		*(head1)->tqh_last = (head2)->tqh_first;		\