c - 当N个socket与一个监听socket连接时，epoll_wait()会通知进程多少次？

Question

When successful, epoll_wait(2) returns the number of file descriptors ready for the requested I/O, or zero if no file descriptor became ready during the requested timeout milliseconds. When an error occurs, epoll_wait(2) returns -1 and errno is set appropriately.

假设epoll被ET触发，epoll_wait对于N个连接的socket会通知进程N次还是只通知一次？

Answer 1

如果 N 个客户端同时连接并且您接受所有客户端，则会发生进一步的通知。如果 N 个客户端连接并且您接受 N-1 个客户端，则在您消耗完所有事件之前不会发生通知。