/*      */#ifndef _TCPIP_H_#define _TCPIP_H_void tcpip_init(void (* tcpip_init_done)(void *), void *arg);void tcpip_apimsg(struct api_msg *apimsg);err_t tcpip_input(struct pbuf *p, struct netif *inp);err_t tcpip_callback(void (*f)(void *ctx), void *ctx);void tcpip_tcp_timer_needed(void);enum tcpip_msg_type {  TCPIP_MSG_API,  TCPIP_MSG_INPUT,  TCPIP_MSG_CALLBACK};struct tcpip_msg {  enum tcpip_msg_type type;  sys_sem_t *sem;  union {    struct api_msg *apimsg;    struct {      struct pbuf *p;      struct netif *netif;    } inp;    struct {      void (*f)(void *ctx);      void *ctx;    } cb;  } msg;};#endif /* __LWIP_TCPIP_H__ */