linux协议栈 lwip

#include "lwip/init.h"
#include "lwip/netif.h"
#include "lwip/tcp.h"

static err_t tcp_server_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
    if (err != ERR_OK || newpcb == NULL) {
        return ERR_VAL;
    }
    tcp_recv(newpcb, tcp_server_recv);
    tcp_err(newpcb, tcp_server_error);
    tcp_poll(newpcb, tcp_server_poll, 4);
    return ERR_OK;
}

static err_t tcp_server_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err) {
    if (p == NULL) {
        tcp_close(tpcb);
        return ERR_OK;
    }
    // 处理接收到的数据
    pbuf_free(p);
    return ERR_OK;
}

void start_tcp_server(void) {
    struct tcp_pcb *pcb;
    lwip_init();
    pcb = tcp_new();
    if (pcb != NULL) {
        tcp_bind(pcb, IP_ADDR_ANY, 8080);
        pcb = tcp_listen(pcb);
        tcp_accept(pcb, tcp_server_accept);
    }
}