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linux系统编程（十③）RK3568 socket之 TCP 服务器的实现【更新客户端断开重连依旧可以收发】

news 2025/10/18 5:58:28

这里对上一篇：https://blog.csdn.net/u012507643/article/details/153483336?spm=1011.2124.3001.6209

服务器编程再客户端断开重连后不能响应的解决办法

直接上程序【这里解决的思路还是和tcp客户端连接服务器的方式一样，用MSG_PEEK去看下recv】

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <linux/tcp.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <errno.h>int main(int argc, char *argv[])
{int fd, client_fd;struct sockaddr_in s;struct sockaddr_in c;int len = sizeof(c), rlen = 0;char rx_buf[1024] = {0};fd = socket(AF_INET, SOCK_STREAM, 0);if (fd < 0){printf("create socekt failed\n");return 1;}s.sin_family = AF_INET;s.sin_port = htons(8089);//s.sin_addr.s_addr = INADDR_ANY;inet_pton(AF_INET, "192.168.31.96", &s.sin_addr);bind(fd, (const struct sockaddr *)&s, sizeof(s));printf("start listen\n");if (listen(fd, 10) < 0) {printf("listen failed\n");return 1;}printf("server ip:192.168.31.96,port:8089\n");/* 返回连接上来的套接字 */client_fd = accept(fd, (struct sockaddr *)&c, &len);if (client_fd < 0){printf("sccept failed\n");return 1;}printf("new client %d connected\n", client_fd);while(1){int ret = recv(client_fd, rx_buf, sizeof(rx_buf), MSG_PEEK);if ((ret > 0) || (ret == -1 && errno == EAGAIN)){rlen = recvfrom(client_fd, rx_buf, sizeof(rx_buf), MSG_DONTWAIT, (struct sockaddr *)&c, &len);if (rlen > 0){printf("recv[%s:%d] data:%s,len=%d\n", inet_ntoa(c.sin_addr), ntohs(c.sin_port), rx_buf, rlen);send(client_fd, rx_buf, rlen, MSG_DONTWAIT);memset(rx_buf, 0, sizeof(rx_buf));}} else {printf("clinet %d disconnectted\n", client_fd);close(client_fd);len = sizeof(c);/* 返回连接上来的套接字 */client_fd = accept(fd, (struct sockaddr *)&c, &len);if (client_fd < 0){printf("sccept failed\n");return 1;} else {printf("new clinet fd=%d connectted\n", client_fd);}}}close(fd);close(client_fd);return 0;
}

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