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;}

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/***************************************** *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destint 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;}

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#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 10240int 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;}