epoll函数的简单使用

server.c

#include <stdio.h>
#include <sys/epoll.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
int main() {

	struct sockaddr_in serveraddr ;
	memset(&serveraddr,0,sizeof(serveraddr)) ;
	
	serveraddr.sin_family = AF_INET ;
	serveraddr.sin_port = htons(8000) ;
	serveraddr.sin_addr.s_addr = 0 ;

	int sockfd = socket(AF_INET,SOCK_STREAM,0) ;

	bind(sockfd,(struct sockaddr*)&serveraddr, sizeof(serveraddr)) ;
	listen(sockfd, 10) ;

	int ep_fd = epoll_create(20) ;
	struct epoll_event ev ;

	ev.events = EPOLLIN ;
	ev.data.fd = sockfd ;

	epoll_ctl(ep_fd, EPOLL_CTL_ADD, sockfd , &ev) ;
	struct epoll_event events[20] ;
	int cur_sock_num = 1 ;
	char recvbuf[1000] ;
	while(1){
		int event_n = epoll_wait(ep_fd,events ,cur_sock_num,-1) ;
		int i = 0 ;
		for (i = 0; i < event_n; i++) {
			if(events[i].data.fd == sockfd){
				int newsockfd = accept(sockfd,NULL,NULL) ;
				ev.events = EPOLLIN ;
				ev.data.fd = newsockfd ;
				epoll_ctl(ep_fd, EPOLL_CTL_ADD, newsockfd , &ev) ;
				cur_sock_num ++ ;
			}else{
				int recv_len = read(events[i].data.fd , recvbuf,1000) ;
				recvbuf[recv_len] = 0 ;
				printf("socket %d recv : %s\n", events[i].data.fd,recvbuf) ;
			}
		}
	}

	return 0;
}