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the time64 syscall is used only if the timeout does not fit in 32
bits. after preprocessing, the code is unchanged on 64-bit archs. for
32-bit archs, the timeout now goes through an intermediate copy,
meaning that the caller does not get back the updated timeout. this is
based on my reading of the documentation, which does not document the
updating as a contract you can rely on, and mentions that the whole
recvmmsg timeout mechanism is buggy and unlikely to be useful. if it
turns out that there's interest in making the remaining time
officially available to callers, such functionality could be added
back later.
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