给我提供一个简单的epoll聊天室c程序

### 回答1：

我可以为你提供一个简单的epoll聊天室C程序的示例：
#include <stdio.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <unistd.h> #define MAX_EVENTS 64
#define MAX_BUFFER_SIZE 1024int main(int argc, char *argv[]) {
int server_fd, new_socket, epoll_fd;
struct sockaddr_in server_address;
struct epoll_event event, events[MAX_EVENTS];
int addrlen, i, bytes_read;
char buffer[MAX_BUFFER_SIZE];
int opt = 1; // 创建服务器套接字
server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
} // 为服务器套接字设置选项
if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
perror("setsockopt");
exit(EXIT_FAILURE);
} // 设置服务器地址
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = INADDR_ANY;
server_address.sin_port = htons(8080); // 绑定服务器套接字
if (bind(server_fd, (struct sockaddr *)&server_address, sizeof(server_address))<0) {
perror("bind failed");
exit(EXIT_FAILURE);
} // 监听服务器套接字
if (listen(server_fd, 3) < 0) {
perror("listen");
exit(EXIT_FAILURE);
} // 创建epoll实例
epoll_fd = epoll_create1(0);
if (epoll_fd == -1) {
perror("epoll_create1");
exit(EXIT_FAILURE);
} // 添加服务器套接字到epoll实例
event.data.fd = server_fd;
event.events = EPOLLIN;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, server_fd, &event)) {
perror("epoll_ctl");
exit(EXIT_FAILURE);
} // 主循环
while (1) {
int nfds = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
if (nfds == -1) {
perror("epoll_wait");
exit(EXIT_FAILURE);
} for (i=0; i<nfds; i++) {
// 如果事件是来自服务器套接字
if (events[i].data.fd == server_fd) {
new_socket = accept(server_fd, (struct sockaddr *) &server_address, (socklen_t*)&addrlen);
if (new_socket < 0) {
perror("accept");
exit(EXIT_FAILURE);
} // 添加新客户端到epoll实例
event.data.fd = new_socket;
event.events = EPOLLIN;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, new_socket, &event)) {
perror("epoll_ctl");
exit(EXIT_FAILURE);
}
}
// 如果事件是来自客户端
else {
// 接收客户端消息
bytes_read = recv(events[i].data.fd, buffer, MAX_BUFFER_SIZE, 0);
if (bytes_read == 0) {
// 客户端断开连接
close(events[i].data.fd);
} else {
// 将消息发送给所有客户端
send(events[i].data.fd, buffer, bytes_read, 0);
}
}
}
} return 0;
}

### 回答2：
下面是一个简单的基于epoll的聊天室C程序的例子：

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

#define MAX_CLIENTS 10
#define MAX_EVENTS 10
#define MAX_BUFFER_SIZE 1024

int main() {
    int serverSocket, epollFD;
    struct sockaddr_in serverAddr, clientAddr;
    socklen_t clientAddrSize;
    char buffer[MAX_BUFFER_SIZE];
    struct epoll_event events[MAX_EVENTS];

    // 创建socket
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == -1) {
        perror("Error creating socket");
        exit(EXIT_FAILURE);
    }

    // 设置server端地址
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(9999);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    // 将socket绑定到server地址
    if (bind(serverSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
        perror("Error binding socket");
        exit(EXIT_FAILURE);
    }

    // 开启监听模式
    if (listen(serverSocket, MAX_CLIENTS) < 0) {
        perror("Error listening");
        exit(EXIT_FAILURE);
    }

    // 创建epoll实例
    epollFD = epoll_create1(0);
    if (epollFD == -1) {
        perror("Error creating epoll instance");
        exit(EXIT_FAILURE);
    }

    //添加server socket事件到epoll
    struct epoll_event event;
    event.events = EPOLLIN;
    event.data.fd = serverSocket;
    if (epoll_ctl(epollFD, EPOLL_CTL_ADD, serverSocket, &event) == -1) {
        perror("Error adding server socket to epoll");
        exit(EXIT_FAILURE);
    }

    while (1) {
        // 等待事件
        int numEvents = epoll_wait(epollFD, events, MAX_EVENTS, -1);
        if (numEvents == -1) {
            perror("Error waiting for events");
            exit(EXIT_FAILURE);
        }

        for (int i = 0; i < numEvents; i++) {
            if (events[i].data.fd == serverSocket) {
                // 处理连接请求
                int clientSocket = accept(serverSocket, (struct sockaddr *)&clientAddr, &clientAddrSize);
                if (clientSocket == -1) {
                    perror("Error accepting client connection");
                    exit(EXIT_FAILURE);
                }

                // 将新连接的client socket添加到epoll中
                event.events = EPOLLIN;
                event.data.fd = clientSocket;
                if (epoll_ctl(epollFD, EPOLL_CTL_ADD, clientSocket, &event) == -1) {
                    perror("Error adding client socket to epoll");
                    exit(EXIT_FAILURE);
                }

                printf("New client connected. IP: %s, Port: %d\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));
            } else {
                // 处理客户端发送的消息
                int clientSocket = events[i].data.fd;
                int bytesRead = read(clientSocket, buffer, sizeof(buffer));
                if (bytesRead <= 0) {
                    // 客户端断开连接
                    epoll_ctl(epollFD, EPOLL_CTL_DEL, clientSocket, NULL);
                    close(clientSocket);
                    printf("Client disconnected\n");
                } else {
                    // 从buffer中读取消息并处理
                    // 这里可以根据实际需要编写代码
                    printf("Received message from client: %.*s\n", bytesRead, buffer);
                }
            }
        }
    }

    // 清理关闭socket和epoll实例
    close(serverSocket);
    close(epollFD);
    return 0;
}

这段示例代码通过创建一个epoll实例，监听server socket和客户端socket上的事件，以实现一个简单的聊天室功能。当有新的客户端连接时，将其socket添加到epoll实例中，并打印客户端的IP和端口信息。当客户端发送消息时，将消息打印到控制台。当客户端断开连接时，将其socket从epoll实例中移除，并关闭连接。请注意，在实际生产环境中，需要增加对错误处理和异常情况的处理，以及更完善的聊天室逻辑。

### 回答3：
以下是一个简单的使用epoll的聊天室C程序：

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

#define MAX_EVENTS 10
#define BUFFER_SIZE 1024

int main() {
    // 创建套接字
    int server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd == -1) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址
    struct sockaddr_in server_addr;
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(8080);

    // 绑定套接字
    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("Socket binding failed");
        exit(EXIT_FAILURE);
    }

    // 监听套接字
    if (listen(server_fd, 1) == -1) {
        perror("Socket listening failed");
        exit(EXIT_FAILURE);
    }

    // 创建epoll实例
    int epoll_fd = epoll_create1(0);
    if (epoll_fd == -1) {
        perror("Epoll creation failed");
        exit(EXIT_FAILURE);
    }

    struct epoll_event ev, events[MAX_EVENTS];

    // 将监听套接字添加到epoll实例中
    ev.events = EPOLLIN;
    ev.data.fd = server_fd;
    if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, server_fd, &ev) == -1) {
        perror("Epoll control failed");
        exit(EXIT_FAILURE);
    }

    while (1) {
        // 等待事件发生
        int num_events = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
        if (num_events == -1) {
            perror("Epoll wait failed");
            exit(EXIT_FAILURE);
        }

        for (int i = 0; i < num_events; i++) {
            if (events[i].data.fd == server_fd) {
                // 新的连接请求
                int client_fd = accept(server_fd, NULL, NULL);
                if (client_fd == -1) {
                    perror("Socket accepting failed");
                    exit(EXIT_FAILURE);
                }

                // 将新的连接套接字添加到epoll实例中
                ev.events = EPOLLIN;
                ev.data.fd = client_fd;
                if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &ev) == -1) {
                    perror("Epoll control failed");
                    exit(EXIT_FAILURE);
                }
            } else {
                // 客户端发送消息
                char buffer[BUFFER_SIZE];
                int nbytes = recv(events[i].data.fd, buffer, BUFFER_SIZE, 0);
                if (nbytes <= 0) {
                    close(events[i].data.fd);
                    epoll_ctl(epoll_fd, EPOLL_CTL_DEL, events[i].data.fd, NULL);
                } else {
                    for (int j = 0; j < num_events; j++) {
                        if (events[j].data.fd != server_fd && events[j].data.fd != events[i].data.fd) {
                            send(events[j].data.fd, buffer, nbytes, 0);
                        }
                    }
                }
            }
        }
    }

    close(server_fd);
    return 0;
}

这个程序创建了一个基于epoll的聊天室服务器，能够接受多个客户端连接，并将客户端发送的消息广播到其他连接的客户端。程序使用一个epoll实例来管理多个套接字的事件，包括监听套接字（server_fd）和连接套接字（client_fd）。它使用了简单的循环和epoll_wait函数来等待事件的发生，并根据不同的事件类型进行处理。对于新的连接请求，会接受新连接并将其添加到epoll实例中。对于已连接的客户端发送的消息，会读取消息并将消息发送给其他连接的客户端。在程序中，BUFFER_SIZE定义了接收和发送消息的缓冲区大小，MAX_EVENTS定义了epoll_wait一次能够处理的最大事件数。