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    A very concise and nicely written overview that is, as always for Julia Evans’ blog posts, easily understandable even without much prior knowledge. It looks like the post was written in a hurry because there is an unfinished sentence

    The epoll group of system calls (epoll_create, epoll_ctl, epoll_wait) give the Linux kernel a list of file descriptors to track and ask for updates about whether

    and some typos here and there.