Set FD_CLOEXEC flag on duplicated kqueue Poll #1498
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Same as commit c52635c, but for kqueue.
Calls fcntl F_DUPFD_CLOEXEC expects two arguments; the command (F_DUPFD_CLOEXEC) and an argument for the command. In this case an lower bound for the resulting file descriptor. Because we didn't provide a value it would take whatever value was left in the register from whatever code used it before the system call. This caused Waker::new to fail, see issue tokio-rs#1497.
Darksonn
approved these changes
Jun 14, 2021
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Fixes #1497.