这几天一直在看TCP/IP这块的内容，写个简单socket通信demo，实现了多个客户端相互发送消息，以及服务端给多个客户端发送上线/下线消息

基本框架：

server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <unistd.h>
#include <netinet/in.h>
#include <pthread.h>#define PORT 6666
#define NUM_MAX_WAIT 1
#define NUM_MAX_CHAT 2typedef struct Message {bool type;  // 0: system  1: clientchar buff[1024];char name[30];
}Message;typedef struct Client {bool c_flage;int  c_fd;
}Client;int sockfd = 0;
int num_chat = 0;
bool quit = false;
pthread_t ptid[2] = {};
Client client[4] = {};void* pthread_comm(void* argc)
{Client* cli_co