1、netlink 連接器 通信機(jī)制
使用netlink之前，先參考一下資料：http://www.ibm.com/developerworks/cn/linux/l-connector/
netlink通信機(jī)制介紹：資料來源 linux-4.8.13/Documentation/connector/connector.txt 2016-12-10 21:31:04
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Kernel Connector.
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Kernel connector - new netlink based userspace <-> kernel space easy
to use communication module.
The Connector driver makes it easy to connect various agents using a
netlink based network. One must register a callback and an identifier.
When the driver receives a special netlink message with the appropriate
identifier, the appropriate callback will be called.
From the userspace point of view it's quite straightforward:
socket();
bind();
send();
recv();
用戶空間使用netlink相對簡單一些。
But if kernelspace wants to use the full power of such connections, the
driver writer must create special sockets, must know about struct sk_buff
handling, etc... The Connector driver allows any kernelspace agents to use
netlink based networking for inter-process communication in a significantly
easier way:
int cn_add_callback(struct cb_id *id, char *name, void (*callback) (struct cn_msg *, struct netlink_skb_parms *));
void cn_netlink_send_multi(struct cn_msg *msg, u16 len, u32 portid, u32 __group, int gfp_mask);
void cn_netlink_send(struct cn_msg *msg, u32 portid, u32 __group, int gfp_mask);
struct cb_id
{
__u32 &n
