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Learn how to use epoll API to monitor multiple file descriptors for I/O events in Linux. Compare edge-triggered and level-triggered modes, and see the system calls, flags, and /proc interfaces for epoll.
When used as an edge-triggered interface, for performance reasons, it is possible to add the file descriptor inside the epoll interface (EPOLL_CTL_ADD) once by specifying (EPOLLIN | EPOLLOUT).
In this case you start waiting for output to be possible (kernel draining socket send buffer thus making room for you to send more) by including EPOLLOUT. Once you get that, write your pending output bytes to the sock...
EPOLLEXCLUSIVE: EPOLLIN, EPOLLOUT, EPOLLWAKEUP, and EPOLLET. EPOLLHUP and EPOLLERR can also be specified, but this is not required: as usual, these events are always reported if they occur, regardless of whether they ...
Mar 21, 2021 · 本文详细解析了Linux下epoll机制中EPOLLOUT事件的触发条件与应用场景，包括客户端连接、数据发送等问题，提供了具体示例代码帮助理解。
To address the inefficiencies of select() and poll(), an event-driven mechanism called epoll was introduced in Linux kernel version 2.5.44, released in 2002.
When used as an Edge triggered interface, for performance reasons, it is possible to add the file descriptor inside the epoll interface ( EPOLL_CTL_ADD ) once by specifying ( EPOLLIN | EPOLLOUT ).
在客户端终端输入1，此时服务端终端会输出epollin和epollout，epollin产生的原因是因为客户端发来数据，此时服务端的socket可读，epollout产生的原因是因为服务端的socket可写。
epoll is a variant of poll(2) that can be used either as an edge-triggered or a level-triggered interface and scales well to large numbers of watched file descriptors. Three system calls are provided to set up and con...
epoll - I/O event notification facility. The epoll API performs a similar task to poll (2): monitoring multiple file descriptors to see if I/O is. possible on any of them. The epoll API can be used either as an edge-t...
