struct list_head {
	struct list_head *next;
	struct list_head *prev;
};

static inline void list_init(struct list_head *list)
{
	list->next = list;
	list->prev = list;
}

static inline void list_del(struct list_head *list)
{
	list->next->prev = list->prev;
	list->prev->next = list->next;
}

static inline void list_add(struct list_head *new, struct list_head *list)
{
	list->next->prev = new;
	new->next = list->next;
	new->prev = list;
	list->next = new;
}

static inline bool list_empty(struct list_head *list)
{
	return list->next == list;
}

#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

#define container_of(ptr, type, member) ({				\
	const typeof( ((type *)0)->member ) *__mptr = (ptr);		\
	(type *)( (char *)__mptr - offsetof(type,member) );})

#define list_entry(ptr, type, member)					\
	container_of(ptr, type, member)

#define list_first_entry(ptr, type, member)				\
	list_entry((ptr)->next, type, member)

#define list_next_entry(pos, member)					\
	list_entry((pos)->member.next, typeof(*(pos)), member)

#define list_for_each(pos, head)					\
	for (pos = (head)->next; pos != (head); pos = pos->next)

#define list_for_each_entry(pos, head, member)				\
	for (pos = list_first_entry(head, typeof(*pos), member);	\
	     &pos->member != (head);					\
	     pos = list_next_entry(pos, member))

static inline void* zmalloc(size_t size)
{
	return calloc(1, size);
}

#define _cleanup_(x) __attribute__((cleanup(x)))

#define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)				\
	static inline void func##p(type *p) {				\
		if (*p)							\
			func(*p);					\
	}								\
	struct __useless_struct_to_allow_trailing_semicolon__


static inline void sd_bus_close_unrefp(sd_bus **bus) {
        if (*bus) {
                sd_bus_flush(*bus);
                sd_bus_close(*bus);
                sd_bus_unref(*bus);
        }
}
#define _cleanup_bus_close_unref_ _cleanup_(sd_bus_close_unrefp)

static inline void strv_free(char **l) {
	char **k;
	if (l) {
		for (k = l; *k; k++)
			free(k);
		free(l);
	}
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char **, strv_free);
#define _cleanup_strv_free_ _cleanup_(strv_freep)

DEFINE_TRIVIAL_CLEANUP_FUNC(void *, free);
#define _cleanup_free_ _cleanup_(freep)

DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus *, sd_bus_unref);
#define _cleanup_bus_unref_ _cleanup_(sd_bus_unrefp)

DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_slot *, sd_bus_slot_unref);
#define _cleanup_bus_slot_unref_ _cleanup_(sd_bus_slot_unrefp)

DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_message *, sd_bus_message_unref);
#define _cleanup_bus_message_unref_ _cleanup_(sd_bus_message_unrefp)

DEFINE_TRIVIAL_CLEANUP_FUNC(sd_event_source *, sd_event_source_unref);
#define _cleanup_event_source_unref_ _cleanup_(sd_event_source_unrefp)