linux – 如何处理EPOLLERR和EPOLLHUP？

概述我在libevent epoll中阅读了代码,这里是代码： if (what & (EPOLLHUP|EPOLLERR)) { ev = EV_READ | EV_WRITE; } else { if (what & EPOLLIN) ev |= EV_READ; if (wha 我在libevent epoll中阅读了代码,这里是代码：

if (what & (EPolLHUP|EPolLERR)) {            ev = EV_READ | EV_WRITE;        } else {            if (what & EPolliN)                ev |= EV_READ;            if (what & EPolLOUT)                ev |= EV_WRITE;            if (what & EPolLRDHUP)                ev |= EV_CLOSED;        }

据我所知,当EPolLERR或EPolLHUP发生时,应该关闭连接.但是在上面的代码中,当EPolLHUP | EPolLERR遇到时,事件掩码被设置为EV_READ | EV_WRITE.所以我的问题是：

>是什么让EPolLERR和EPolLHUP发生？
>当EPolLERR和EPolLHUP发生时,程序应该在事件处理函数中做什么？请详细解释其背后的原因.

提前致谢！

解决方法

What makes EPolLERR and EPolLHUP happen?

男人epoll_ctl

EPolLERR          Error condition happened on the associated file descriptor.          epoll_wait(2) will always wait for this event; it is not          necessary to set it in events.   EPolLHUP          Hang up happened on the associated file descriptor.          epoll_wait(2) will always wait for this event; it is not          necessary to set it in events.

When EPolLERR and EPolLHUP happen,what should the program do in the
event handle function?

随着libevent通过事件EV_READ |在这种情况下,EV_WRITE,回调函数调用e. G. recv(),当对等体执行有序关闭(EPolLHUP)时可能返回0,如果发生错误则返回-1(EPolLERR);然后程序可能会清理连接,如果它是客户端,可能会重新建立连接.

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