epoll_wait 。。

/*********************************
 * mkfifo p1 p2
 * cat > p1
 * cat > p2
 *FileName: epoll_wait.c
 *Author  : Dai
 *Version : 1
 *Date    : 2014.09.19
 *Description: 用epoll_wait监听多个管道，管道中有内容就读出  （1）epoll_creat()创建一个句柄
 *Note    :  打开一个文件用非阻塞方式，不然会阻塞到read上, 而我们要求用epoll_wait()阻塞到epoll_wait()上
 *********************************/
#include <stdio.h>
#include <sys/epoll.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>

struct epoll_event env;
int main(void)
{
	int fd1, fd2;
	if((fd1 = open("p1", O_RDONLY|O_NONBLOCK)) == -1){
		perror("open p1 fail\n");
		exit(-1);
	}
	if((fd2 = open("p2", O_RDONLY|O_NONBLOCK)) == -1){
		perror("open p2 fail\n");
		exit(-1);
	}

	int epoll_fd = epoll_create(1);
	if(epoll_fd == -1)
		perror("epoll create fail\n");
	env.data.fd = fd1;
	env.events  = EPOLLIN|EPOLLET;
	if((epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd1, &env)) == -1)
		perror("epoll_ctl  p1 fail\n");

	env.data.fd = fd2;
	env.events  = EPOLLIN | EPOLLET;
	if((epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd2, &env)) == -1)
		perror("epoll_ctl  p2 fail\n");

	while(1){
		char buf[32];
		epoll_wait(epoll_fd, &env, 1, -1);
		int fd = env.data.fd;
		int len;
		while((len = (read(fd, buf, 32))) > 0)
			buf[len] = '\0';
			printf("get %s from %d\n", buf, fd);
	}


	return 0;
}

***********************************************************************************************************

/*****************************************
 *Discription:用socket实现远程登录访问  用epoll_wait实现并发  两个端口进行通信
 *socket 产生用于监听的描述符  bind 绑定地址和端口    listen 把套接字设为被动  accept()用于产生和客户机进行交	互的文件描述符
 *
 *
 *
 *
 * *********************************/

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

#define SERV_port 8000  //端口号
#define max_r 100		//存取从客户端读过来的空间
#define max_ep 10		//从内核可以处理事件集合的大小
char buf_f[1024];
int flag_fd[100];
int f_fd;
int main(void)
{
	int listenfd, connfd;
	char buf[100];
	char buf1[100];
	int r_len;
	char str[INET_ADDRSTRLEN];                      //。。。。。。。
	struct sockaddr_in servaddr, cliaddr;            

	int ep_fd, cur_ep, accept_Count = 0;			//ep_fd创建的句柄用于处理wait的epoll文件描述符 cur_ep用于记录当前epoll_wait监听事件的个数
	int nfds, i, j;   //epoll_wait返回的处理事件的个数
	struct epoll_event ep_env;    //用于注册事件
	struct epoll_event events[max_ep];//用于回传要处理的事件

	listenfd = socket(AF_INET, SOCK_STREAM, 0);
	int opt = 1;
    setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(SERV_port);
	if(bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) == -1){
		perror("bind fail\n");
	}
	if(listen(listenfd, 20) == -1){
		perror("listen fail\n");
	}
	printf("now we can accept connections\n");

	//创建epoll句柄 并把监听socket加入epoll队列	
	if((ep_fd = epoll_create(1)) == -1){
		perror("epoll_create fail\n");
		exit(-1);
	}
	memset(flag_fd, 0, sizeof(flag_fd));
	ep_env.data.fd = listenfd;
	ep_env.events  = EPOLLIN | EPOLLET;
	if((epoll_ctl(ep_fd, EPOLL_CTL_ADD, listenfd, &ep_env)) == -1){
		perror("epoll_ctl fail\n");
	}
	//把服务器标准输入加入epoll队列
	ep_env.data.fd = STDIN_FILENO;
	ep_env.events  = EPOLLIN | EPOLLET;
	if((epoll_ctl(ep_fd, EPOLL_CTL_ADD, STDIN_FILENO, &ep_env)) == -1){
		perror("epoll_ctl fail\n");
	}
	flag_fd[listenfd] = 1;
	flag_fd[STDIN_FILENO] = 1;
	printf("epoll_server start server port:%d\n", SERV_port);
	cur_ep = 2;
	while(1){
		nfds = epoll_wait(ep_fd, events, cur_ep, -1);
		for(i = 0; i < nfds; i++){
			if(events[i].data.fd == listenfd){
				int cliaddr_len = sizeof(cliaddr);
				connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &cliaddr_len);
				sprintf(buf, "accept from %s at port %d\n", inet_ntoa(cliaddr.sin_addr), cliaddr.sin_port);
				printf("%d:%s", ++accept_Count, buf);

				ep_env.events = EPOLLIN | EPOLLET;
				ep_env.data.fd = connfd;
				epoll_ctl(ep_fd, EPOLL_CTL_ADD, connfd, &ep_env);
				flag_fd[connfd] = 1;
				cur_ep++;
				continue;
			}
			else if(events[i].data.fd == STDIN_FILENO){
						if(handle(events[i].data.fd, connfd) < 0) {
							epoll_ctl(ep_fd, EPOLL_CTL_DEL, j, &ep_env);
							close(events[i].data.fd);
							cur_ep--;
							flag_fd[events[i].data.fd] = 0;
						}						
			}
			else{
				if(handle(events[i].data.fd, STDIN_FILENO) < 0){
					epoll_ctl(ep_fd, EPOLL_CTL_DEL, connfd, &ep_env);
					close(events[i].data.fd);
					cur_ep--;
					flag_fd[events[i].data.fd] = 0;
				}
			}

		
			
		}
		/*
		int cliaddr_len = sizeof(cliaddr);
		while((r_len = read(connfd, buf, max_r))){
		printf("received from %s at port %d\n", inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)), 
				ntohs(cliaddr.sin_port));
		write(connfd, buf, r_len);
		}*/
	}
	close(listenfd);
	return 0;
}
//从src复制到dest
int handle(int src, int dest) {
	int nread;
	int j;
	char buf[1024];
	nread = read(src, buf, 1024);
	if(nread == 0){
		printf("client close the connection\n");
		return -1;
	}
	if(nread < 0){
		perror("read error");
		return -1;
	}
	for(j = 0; j < 100; j++)
		if(j != 3 && j != src && flag_fd[j] == 1) 
			write(j, buf, nread);
	return 0;
}

**********************************************************

#include  <unistd.h>
#include  <sys/types.h>       /* basic system data types */
#include  <sys/socket.h>      /* basic socket definitions */
#include  <netinet/in.h>      /* sockaddr_in{} and other Internet defns */
#include  <arpa/inet.h>       /* inet(3) functions */
#include <sys/epoll.h> /* epoll function */
#include <fcntl.h>     /* nonblocking */
#include <sys/resource.h> /*setrlimit */

#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>



#define MAXEPOLLSIZE 10
#define MAXLINE 10240
int handle(int connfd);

int main(int argc, char **argv)
{
    int  servPort = 8000;

    int listenfd, connfd, kdpfd, nfds, n, nread;
        int curfds,acceptCount = 0;
    struct sockaddr_in servaddr, cliaddr;
    socklen_t socklen = sizeof(struct sockaddr_in);
    struct epoll_event ev;
    struct epoll_event events[MAXEPOLLSIZE];
    char buf[MAXLINE];


    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = htonl (INADDR_ANY);
    servaddr.sin_port = htons (servPort);

    listenfd = socket(AF_INET, SOCK_STREAM, 0); 

    int opt = 1;
    setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));


    if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) == -1) 
    {
        perror("bind error");
        return -1;
    } 
    listen(listenfd, 10);
    /* 创建 epoll 句柄，把监听 socket 加入到 epoll 集合里 */
    kdpfd = epoll_create(MAXEPOLLSIZE);
    ev.events = EPOLLIN | EPOLLET;
    ev.data.fd = listenfd;
    epoll_ctl(kdpfd, EPOLL_CTL_ADD, listenfd, &ev);

    curfds = 1;

    printf("epollserver startup,port %d\n", servPort);

    for (;;) {
        /* 等待有事件发生 */
        nfds = epoll_wait(kdpfd, events, curfds, -1);
        /* 处理所有事件 */
        for (n = 0; n < nfds; ++n)
        {
            if (events[n].data.fd == listenfd) 
            {
                connfd = accept(listenfd, (struct sockaddr *)&cliaddr,&socklen);

                sprintf(buf, "accept form %s:%d\n", inet_ntoa(cliaddr.sin_addr), cliaddr.sin_port);
                printf("%d:%s", ++acceptCount, buf);

                ev.events = EPOLLIN | EPOLLET;
                ev.data.fd = connfd;
                epoll_ctl(kdpfd, EPOLL_CTL_ADD, connfd, &ev);
                curfds++;
                continue;
            } 
            // 处理客户端请求
            if (handle(events[n].data.fd) < 0) {
                epoll_ctl(kdpfd, EPOLL_CTL_DEL, events[n].data.fd,&ev);
		close(events[n].data.fd);
                curfds--;
            }
        }
    }
    close(listenfd);
    return 0;
}
int handle(int connfd) {
    int nread;
    char buf[MAXLINE];
    nread = read(connfd, buf, MAXLINE);//读取客户端socket流

    if (nread == 0) {
        printf("client close the connection\n");
        return -1;
    } 
    if (nread < 0) {
        perror("read error");
        return -1;
    }    
    write(connfd, buf, nread);//响应客户端  
    return 0;
}