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三种I/O模型的对比简单总结select/poll/epoll三者的区别如下：
select:
监听的文件描述符个数有最高上限
就绪检查时需要遍历所有事件，效率低
内核态和用户态需要内存拷贝，开销大
poll：
没有最大连接数的限制，基于链表来实现
就绪检查时需要遍历所有事件，效率低
内核态
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select函数原型1int select(int maxfd, fd_set *readset, fd_set *writeset, fd_set *exceptset, const struct timeval *timeout);
头文件#include <sys/select.h
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<a href="/2018/12/15/poll/" class="post-title-link" itemprop="https://modifying.github.io/index.html">Unix网络编程(七、poll)</a>
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poll123456789101112#include <poll.h>// 成功返回就绪的文件描述符个数，超时返回0，失败返回-1int poll(struct pollfd *fdarray, unsigned int nfds, int timeout);// 该就够用于测试指定f
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<a href="/2018/12/14/io_model/" class="post-title-link" itemprop="https://modifying.github.io/index.html">Unix网络编程(五、五种I/O模型)</a>
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<time title="创建时间：2018-12-14 00:50:00 / 修改时间：00:59:02" itemprop="dateCreated datePublished" datetime="2018-12-14T00:50:00+08:00">2018-12-14</time>
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<span itemprop="about" itemscope="" itemtype="http://schema.org/Thing"><a href="/categories/socket/" itemprop="url" rel="index"><span itemprop="name">socket</span></a></span>
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