给我提供一个复杂的epoll聊天室c程序

我可以给你参考一个复杂的epoll聊天室C程序。这里有一段示例代码：#include <sys/socket.h>＃include <netinet/in.h>＃include <arpa/inet.h>＃include <stdio.h>＃include <stdlib.h>＃include <unistd.h>＃include <errno.h>＃include <string.h>＃include <sys/types.h>＃include <time.h>＃include <pthread.h>＃include <sys/epoll.h>＃define PORT 54321＃define MAX_CLIENTS 20＃define MAX_MESSAGE_LENGTH 200＃define MAX_EVENTS 20 int main(int argc, char *argv[]) { int sockfd, epollfd, portno; struct sockaddr_in serv_addr; struct epoll_event event, *events; // Create socket sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) { perror("ERROR opening socket"); exit(1); } memset(&serv_addr, 0, sizeof(serv_addr)); portno = PORT; serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = INADDR_ANY; serv_addr.sin_port = htons(portno); // Bind the socket to the address if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) { perror("ERROR on binding"); exit(1); } // Listen for incoming connections listen(sockfd, MAX_CLIENTS); // Create epoll instance epollfd = epoll_create1(0); if (epollfd == -1) { perror("epoll_create1"); exit(1); } // Add the socket to epoll events event.data.fd = sockfd; event.events = EPOLLIN; if (epoll_ctl(epollfd, EPOLL_CTL_ADD, sockfd, &event) == -1) { perror("epoll_ctl"); exit(1); } // Allocate memory for events array events = calloc(MAX_EVENTS, sizeof(event)); while (1) { int num_events, i; // Wait for events on epoll file descriptor num_events = epoll_wait(epollfd, events, MAX_EVENTS, -1); if (num_events == -1) { perror("epoll_wait"); exit(1); } for (i = 0; i < num_events; i++) { // Handle new incoming connection if (events[i].data.fd == sockfd) { // Accept connection int new_sockfd; struct sockaddr_in cli_addr; socklen_t clilen = sizeof(cli_addr); new_sockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen); if (new_sockfd < 0) { perror("ERROR on accept"); exit(1); } // Add new connection to epoll events event.data.fd = new_sockfd; event.events = EPOLLIN; if (epoll_ctl(epollfd, EPOLL_CTL_ADD, new_sockfd, &event) == -1) { perror("epoll_ctl"); exit(1); } } // Handle incoming message else { // Read message char buffer[MAX_MESSAGE_LENGTH]; int n = read(events[i].data.fd, buffer, MAX_MESSAGE_LENGTH); if (n < 0) { perror("ERROR reading from socket"); exit(1); } // Send message to all connected sockets int j; for (j = 0; j < MAX_CLIENTS; j++) { if (events[j].data.fd != sockfd && events[j].data.fd != events[i].data.fd) { int n = write(events[j].data.fd, buffer, strlen(buffer)); if (n < 0) { perror("ERROR writing to socket"); exit(1); } } } } } } // Close socket close(sockfd); free(events); return 0; }