给我提供一个epoll聊天室代码

### 回答1：

很高兴为您提供一个epoll聊天室代码，如下所示：#include <sys/epoll.h>
#include <fcntl.h>int main(int argc, char **argv)
{
int epfd, nfds;
struct epoll_event ev, events[MAX_CLIENTS];
char buf[MAX_MSG_SIZE];
int i, connfd, n; // Create epoll file descriptor
epfd = epoll_create(MAX_CLIENTS);
if (epfd == -1)
{
perror("epoll_create failed");
exit(EXIT_FAILURE);
} // Add the listening socket to the epoll set
ev.events = EPOLLIN;
ev.data.fd = sockfd;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, sockfd, &ev) == -1)
{
perror("epoll_ctl: listen_sock");
exit(EXIT_FAILURE);
} // Loop forever, waiting for events
for (;;)
{
nfds = epoll_wait(epfd, events, MAX_CLIENTS, -1);
if (nfds == -1)
{
perror("epoll_wait");
exit(EXIT_FAILURE);
} for (i = 0; i < nfds; i++)
{
// Handle new connections
if (events[i].data.fd == sockfd)
{
connfd = accept(sockfd, (struct sockaddr *) &cliaddr, &clilen);
if (connfd == -1)
{
perror("accept");
exit(EXIT_FAILURE);
}
setnonblocking(connfd);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = connfd;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, connfd, &ev) == -1)
{
perror("epoll_ctl: connfd");
exit(EXIT_FAILURE);
}
}
else
{
// Handle data from a client
do
{
n = read(events[i].data.fd, buf, MAX_MSG_SIZE);
if (n > 0)
{
// Send the message to all clients
for (j = 0; j < MAX_CLIENTS; j++)
{
if (clientfd[j] != 0)
{
write(clientfd[j], buf, n);
}
}
}
} while (n > 0); if (n == 0)
{
// Connection closed by client
close(events[i].data.fd);
} else {
perror("read");
exit(EXIT_FAILURE);
}
}
}
}
}

### 回答2：
下面是一个使用epoll实现的简单聊天室代码：

import socket
import select

# 创建一个TCP套接字
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

# 绑定地址和端口
server_address = ('', 8888)
server_socket.bind(server_address)

# 开始监听
server_socket.listen(10)

# 创建一个epoll对象
epoll = select.epoll()

# 注册服务器套接字到epoll对象上，并监听读事件
epoll.register(server_socket.fileno(), select.EPOLLIN)

# 保存客户端套接字与地址的映射关系
client_sockets = {}
client_addresses = {}

while True:
    events = epoll.poll(1)

    for fileno, event in events:
        # 如果是服务器套接字上的事件，表示有新的连接请求
        if fileno == server_socket.fileno():
            client_socket, client_address = server_socket.accept()
            print('New client connected:', client_address)
            
            # 在epoll对象上注册客户端套接字，并监听读事件
            epoll.register(client_socket.fileno(), select.EPOLLIN)
            
            # 保存客户端套接字和地址
            client_sockets[client_socket.fileno()] = client_socket
            client_addresses[client_socket.fileno()] = client_address
        # 如果是客户端套接字上的事件，表示有数据到达
        elif event & select.EPOLLIN:
            receiving_socket = client_sockets[fileno]
            data = receiving_socket.recv(1024)
            
            if data:
                print('Received data:', data.decode('utf-8'))
                for client_fileno, client_socket in client_sockets.items():
                    if client_fileno != fileno:
                        client_socket.sendall(data)
            else:
                # 如果没有数据到达，表示客户端已断开连接
                epoll.unregister(fileno)
                receiving_socket.close()
                del client_sockets[fileno]
                del client_addresses[fileno]

# 关闭服务器套接字和epoll对象
server_socket.close()
epoll.close()

这段代码实现了一个简单的聊天室服务器，使用了epoll来实现并发处理客户端连接和数据传输。当有新的连接请求时，会将客户端套接字注册到epoll对象上，并监听读事件。当客户端套接字上有数据到达时，会将该数据发送给其他所有客户端。同时也会处理客户端断开连接的情况。