#include <myhead.h>

void insert_client(int *client_arr,int *len,int client)
{
    //client_arr[n]={3,4} len=&client_count,client_count=2;
    //添加 5 client_arr[2(*len)]=5(client)
    client_arr[*len]=client;
    (*len)++;
}
int find_client(int *client_arr,int len,int client)
{
    for(int i=0;i<len;i++)
    {
        if(client_arr[i]==client)
        {
            return i;
        }
    }
    return -1;
}
void remove_client(int *client_arr,int *len,int client)
{
    int tar = find_client(client_arr,*len,client);
    if(tar==-1){return;}
    for(int i=tar;i<*len-1;i++)
    {
        client_arr[i]=client_arr[i+1];
    }
    (*len)--;
}
int main(int argc, const char *argv[])
{
/*        FILE* fp = popen("hostname -I","r");
        char ip[32] = {0};
        fread(ip,32,1,fp);
        printf("ip = %s\n",ip);*/
        if(argc!=2)
        {
            printf("请输入正确的端口号\n");
        }
        fd_set readfds;
        int port = atoi(argv[1]);
        FD_ZERO(&readfds);
        int client_arr[100]={0};
        int client_count=0;
        int server =socket(AF_INET,SOCK_STREAM,0);
        if(server==-1)
        {
            perror("socket");
            return -1;
        }
        printf("socket success\n");
        int reuse =1;
        if(setsockopt(server,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
        {
            perror("resue");
            return -1;
        }
        struct sockaddr_in sin;
        sin.sin_family=AF_INET;
        sin.sin_port=htons(port);
        sin.sin_addr.s_addr=inet_addr("192.168.2.97");
        if(bind(server,(struct sockaddr*)&sin,sizeof(sin))==-1)
        {
            perror("bind");
            return -1;
        }
        printf("bind success\n");
        if(listen(server,128)==-1)
        {
            perror("listen");
            return -1;
        }
        
        FD_SET(server,&readfds);
        FD_SET(0,&readfds);
    //    fd_set writefds;
    //    FD_SET(0,&writefds);
        while(1)
        {
/*            fd_set arr=writefds;
            select(FD_SETSIZE,&arr,0,0,0);
            if(FD_ISSET(0,&arr)==1)
            {
                char buf[128]="";
                scanf("%s",buf);
                while(getchar()!=10);
                for(int i=0;i<client_count;i++)
                {
                    int fd = client_arr[i];
                    write(fd,buf,sizeof(buf));
                }
                printf("发送成功\n");
            }*/
            fd_set temp=readfds;
            select(FD_SETSIZE,&temp,0,0,0);
            if(FD_ISSET(server,&temp))
            {
            int client=accept(server,0,0);
            printf("有新客户端连接\n");
            FD_SET(client,&readfds);
            insert_client(client_arr,&client_count,client);
            }

            for(int i=0;i<client_count;i++)
            {
                int client = client_arr[i];//就是每一个套接字
                if(FD_ISSET(client,&temp)==1)
                {
                    char buf[128]="";
                    int res = read(client,buf,128);
                    //客户端断开连接 read函数根据阻塞状态不同 返回值是不同的
                    //read如果是一个非阻塞函数，客户端断开连接 read返回0
                    //read如果是一个阻塞函数，客户端断开连接 read返回-1
                    if(res==0)
                    {
                        printf("有客户端断开连接\n");
                        FD_CLR(client,&readfds);
                        remove_client(client_arr,&client_count,client);
                        close(client);
                        break;
                    }
                    printf("客户端发来消息：%s\n",buf);
                    }
                }
            if(FD_ISSET(0,&temp)==1)
            {
                char buf[128]="";
                scanf("%s",buf);
                while(getchar()!=10);
                for(int i=0;i<client_count;i++)
                {
                    int fd = client_arr[i];
                    write(fd,buf,sizeof(buf));
                }
                printf("发送成功\n");
            }

            }
    

    return 0;
}

work2.c

#include <myhead.h>
int main(int argc, const char *argv[])
{
        int sfd = socket(AF_INET,SOCK_STREAM,0);
        if(sfd==-1)
        {
            perror("sfd");
            return -1;
        }
        int reuse =1;
        if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
        {
            perror("sfd");
            return -1;
        }
        struct sockaddr_in sin;
        sin.sin_family=AF_INET;
        sin.sin_port=htons(6666);
        sin.sin_addr.s_addr=inet_addr("192.168.2.97");
        
        if(connect(sfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
        {
            perror("find");
            return -1;
        }
        fd_set readfds;
        FD_ZERO(&readfds);
        FD_SET(sfd,&readfds);
        FD_SET(0,&readfds);

        while(1)
        {
            fd_set temp = readfds;
            select(FD_SETSIZE,&temp,0,0,0);
            if(FD_ISSET(sfd,&temp)==1)
            {
                char rbuf[128]="";
                read(sfd,rbuf,sizeof(rbuf));
                printf("数据为:%s\n",rbuf);
            }
            if(FD_ISSET(0,&temp)==1)
            {
                char buf[128]="";
                scanf("%s",buf);
                while(getchar()!=10);
                    int fd =sfd;
                    write(fd,buf,sizeof(buf));
                
                printf("发送成功\n");
            }
        }
        close(sfd);

    return 0;
}