#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>

int main(int argc, char const *argv[])
{
    // 1.创建客户端的通信套接字
    int cfd = socket(AF_INET, SOCK_STREAM, 0);
    if(cfd == -1){
        perror("client communication socket create failed");
        return -1;
    }

    printf("create client communication socket succesed\n");

    // 2.连接服务器的ip地址和port端口号
    struct sockaddr_in saddr;
    saddr.sin_family = AF_INET;
    inet_pton(saddr.sin_family, "127.0.0.1", &saddr.sin_addr.s_addr);
    saddr.sin_port = htons(9999);
    int ret = connect(cfd, (struct sockaddr *)&saddr, sizeof(saddr));
    if(ret == -1){
        perror("client connect to server failed");
        return -1;
    }

    printf("client connect to server with ip and port(sockaddr_in) successed\n");

    printf("----------------------------------------------------------------------------------------------------------\n");

    int num = 0;
    // 5.通信
    while(1){
        // 发送数据
        char buff[1024];
        sprintf(buff, "hello server...%d\n", num++);
        printf("client: %s\n", buff);
        send(cfd, buff, strlen(buff)+1, 0);

        // 接收数据
        memset(buff, 0, sizeof(buff));
        int len = recv(cfd, buff, sizeof(buff), 0);
        if(len > 0){
            printf("server say: %s\n", buff);
        }else if(len == 0){
            printf("server has disconnect.\n");
            break;
        }else{
            perror("call recv fail.");
            break;
        }

        sleep(2);
    }

    // 6.关闭文件描述符
    close(cfd);

    return 0;
}