tcp socket client端

#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<unistd.h>
#include<stdlib.h>
#include<errno.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#include<string.h>

#define MAXLINE 1024
#define ERR_EXIT(m)     do { perror(m);   exit(EXIT_FAILURE); } while (0)
int main(int argc, char **argv)
{
	int sockfd;
	struct sockaddr_in servaddr;

	//创建sockfd
	if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
		ERR_EXIT("socket error");

	memset(&servaddr, 0, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(49160);
	//servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
	if((inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr))<0)
		ERR_EXIT("inet_pton error");

	if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
	{
		ERR_EXIT("connect error");
	}

	char sendbuf[MAXLINE] = {0};
	char recvbuf[MAXLINE] = {0};
	while(1)
	{
        printf("input your world:\n");
        scanf("%s", sendbuf);
        write(sockfd, sendbuf, strlen(sendbuf));
        //send(sockfd, sendbuf, strlen(sendbuf),0);

        //receive server msg 
        read(sockfd, recvbuf, sizeof(recvbuf));
        //recv(sockfd, recvbuf, MAXLINE, 0);
        printf("receive server ack:%s\n",recvbuf);
        if (strcmp(sendbuf, "quit") == 0)
        {
        	printf("client quit\n");
        	break;
        }
        memset(sendbuf, 0, sizeof(sendbuf));
        memset(recvbuf, 0, sizeof(recvbuf));
	}
	close(sockfd);
	return 0;
}

server端连接https://blog.csdn.net/ding283595861/article/details/104390861
如果server端ctrl+C退出，由于client端阻塞到用户输入，导致没法第一时间收到server的FIN消息. 可以通过改进client代码，用select来检查socket.可以处理这种case