epoll 使用实例

原文：http://blog.csdn.net/force_eagle/article/details/4348017

epoll网上g一大把, 就不详细叙述了.

推荐几篇好文章:

epoll精髓

epoll相关资料整理

epoll LT VS ET

epoll(7) - Linux man page

EPOLL为我们带来了什么

#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <signal.h>
#include <poll.h>
#include <sys/types.h>
#include <error.h>

void call_poll(void)
{
    struct pollfd fds;
    int32_t timeout_msecs = 5000;
    int err;

    fds.fd = 1;
    fds.events = POLLIN | POLLPRI ;
    err = poll( &fds, 1, timeout_msecs );
    if ( err > 0 ) {
        printf("Data is available now./n");
    }
    else if ( err == 0 ) {
        printf("No data within five seconds./n");
    }
    else  {
        perror( "poll()" );
    }

}
#include <sys/epoll.h>

void call_epoll(void)
{
    int epfd;
    struct epoll_event ev_stdin;
    int err;

    epfd = epoll_create(1);
    if ( epfd < 0 ) {
        perror( "epoll_create()" );
        return ;
    }

    bzero( &ev_stdin, sizeof( struct epoll_event) );
    ev_stdin.events =
        //  available for read operations
        EPOLLIN | EPOLLPRI
        // available for write operations
        // | EPOLLOUT
        // Error condition && Hang up happened
        | EPOLLERR | EPOLLHUP
        // Sets the Edge Triggered behaviour
        | EPOLLET
        // Sets the one-shot behaviour.
        // must call epoll_ctl with EPOLL_CTL_MOD to re-enable
        | EPOLLONESHOT
        ;

    err = epoll_ctl( epfd, EPOLL_CTL_ADD, 1, &ev_stdin );
    if ( err < 0 ) {
        perror( "epoll_ctl()" );
        goto _out;
    }
    err = epoll_wait( epfd, &ev_stdin, 1, 5000 );
    if ( err < 0 ) {
        perror( "epoll_wait()" );
    }
    else if ( err == 0 ) {
        printf("No data within five seconds./n");
    }
    else {
         printf("Data is available now./n");
    }
    //err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );
    //
    err = epoll_ctl( epfd, EPOLL_CTL_DEL, 1, &ev_stdin );
    if ( err < 0 ) {
        perror( "epoll_ctl()" );
    }
_out:
    close( epfd );
}
int main ()
{
    call_epoll();
    return 0;
}

 

阅读(274) | 评论(0) | 转发(0) |

0

上一篇：C++成员函数指针的应用

下一篇：C++中回调(CallBack)的使用方法

相关热门文章

• linux 常见服务端口
• xmanager 2.0 for linux配置
• 【ROOTFS搭建】busybox的httpd...
• openwrt中luci学习笔记
• 什么是shell

• linux dhcp peizhi roc
• 关于Unix文件的软链接
• 求教这个命令什么意思，我是新...
• sed -e "/grep/d" 是什么意思...
• 谁能够帮我解决LINUX 2.6 10...

给主人留下些什么吧！~~

评论热议