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What this PR does:
sys/wait
Actually, I am not sure about which type to use here:
If we use
Fd: AsFd
then the user has to specify that generic type when using this interface, which is kinda user-unfriendly...
The typical usage of this interface will be something like:
UPDATE:
pidfd_open(2)
will be added in #1859 or #1868 .