LeetCode 刷题

/* This structure represents a connected client. There is very little
 * info about it: the socket descriptor and the nick name, if set, otherwise
 * the first byte of the nickname is set to 0 if not set.
 * The client can set its nickname with /nick <nickname> command. */
struct client {
    int fd;      // Client socket.
    char* nick;  // Nickname of the client. 客户端名称，默认为 \0
};

/* This global structure encapsulates the global state of the chat. */
struct chatState {
    int serversock;  // Listening server socket.
    int numclients;  // Number of connected clients right now.
    int maxclient;   // The greatest 'clients' slot populated. 最大的 clients fd 值，用于 select()的第一个参数
    struct client* clients[MAX_CLIENTS];  // 以 client's fd 作为 clients 槽位索引
};