使用libwebsocket搭建websocket服务器实例_lws_ll_fwd_insert

                                                       webcomm与前端的通讯-websocket服务器操作流程

#include <libwebsockets.h>
#include <pthread.h>
#include <string.h>
 
#define MAX_PAYLOAD_SIZE	(4096)
 
/** 开启确认才有重发的机制 */
typedef struct comm_packet {
	void 		*content; 				/* is malloc'd */
	size_t 		content_len;
	uint8_t		enable_ack;				/* 是否需要响应 0：不需要响应 1：需要响应 */
	uint8_t		retry_cnt;				/* 重发的次数(ms)    */	
} comm_packet_t;
 
/* one of these created for each message */
typedef struct msg {
	comm_packet_t	*payload; /* is malloc'd */
	size_t 			len;
} msg_t;
 
/* one of these is created for each client connecting to us */
struct per_session_data__cetwebsocket {
	struct per_session_data__cetwebsocket *pss_list;
	struct lws *wsi;
	uint32_t tail;
	
	struct lws_ring *ring; 		/* ringbuffer holding unsent messages */	
};
 
/* one of these is created for each vhost our protocol is used with */
struct per_vhost_data__cetwebsocket {
	struct lws_context *context;
	struct lws_vhost *vhost;
	const struct lws_protocols *protocol;
 
	struct per_session_data__cetwebsocket *pss_list; /* linked-list of live pss*/
};
 
static int
callback_protocol_cetwebsocket_server(struct lws *wsi, enum lws_callback_reasons reason,
			void *user, void *in, size_t len);
 
#define LWS_PLUGIN_PROTOCOL_CETWEBSOCKET \
	{ \
		"cet-webserver", /* "cet-webserver" */ \
		callback_protocol_cetwebsocket_server, \
		sizeof(struct per_session_data__cetwebsocket), \
		2048, \
		0, NULL, 0 \
	}
 
static struct lws_protocols sg_protocols[] = {
	{ "http", lws_callback_http_dummy, 0, 0 }, 
	LWS_PLUGIN_PROTOCOL_CETWEBSOCKET,
	{ NULL, NULL, 0, 0 } /* terminator */
};
 
static int sg_interrupted = 0;
 
/* destroys the message when