帮忙解释一段代码,该如何解决

帮忙解释一段代码
struct ril_event {
  struct ril_event *next;
  struct ril_event *prev;

  int fd;
  int index;
  bool persist;
  struct timeval timeout;
  ril_event_cb func;
  void *param;
};

static void addToList(struct ril_event * ev, struct ril_event * list)
{
  ev->next = list;
  ev->prev = list->prev;
  ev->prev->next = ev;
  list->prev = ev;
  dump_event(ev);
}

static void removeFromList(struct ril_event * ev)
{
  dlog("~~~~ Removing event ~~~~");
  dump_event(ev);

  ev->next->prev = ev->prev;
  ev->prev->next = ev->next;
  ev->next = NULL;
  ev->prev = NULL;
}

求解释链表对结构体ril_event的添加和删除操作，
是双链表的添加和删除吗？
我觉得不是，自己画了示意图，感觉不对。
求解释这是什么链表，主要讲解addToList()和removeFromList()。

[解决办法]
是双向链表啊
addToList在list之前插入ev
removeFromList删除节点ev
[解决办法]
双向链表

C/C++ code

/*在list节点前插入节点ev，该双向链表应该是循环的*/static void addToList(struct ril_event * ev, struct ril_event * list){  ev->next = list;  ev->prev = list->prev;  ev->prev->next = ev;  list->prev = ev;  dump_event(ev);}/*删除ev节点*/static void removeFromList(struct ril_event * ev){  dlog("~~~~ Removing event ~~~~");  dump_event(ev);  ev->next->prev = ev->prev;  ev->prev->next = ev->next;  ev->next = NULL;  ev->prev = NULL;}