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 https://man7.org/linux/man-pages/man2/pidfd_open.2.html 
https://man7.org/linux/man-pages/man2/signalfd.2.html

Linux 逐渐变成了 Windows 的样子(这个 pidfd 怎么看都是个类似于 HANDLE hProcess 的东西?)

<del>什么你说 everything is a fil ... procfs?</del>