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EPOLL_CTL_ADD used when trying to modify a file descriptor #29

@weissi

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@weissi

basically if a file descriptor is first only used for reading (EPOLLIN) and later on switches to reading and writing (EPOLLOUT), there's currently no way to modify the epoll set as EPOLL_CTL_ADD is used unconditionally (but it should be EPOLL_CTL_MOD). Full details here: https://bugs.swift.org/browse/SR-3360

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