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socket: fall back to SO_TIMESTAMPNS for the OLD alias - #491
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A libc that does not define SO_TIMESTAMPNS_OLD, musl among them, took SO_TIMESTAMP instead, which is the microsecond option. The control message table then held two entries for SO_TIMESTAMP and none for SO_TIMESTAMPNS, so a nanosecond receive timestamp was never decoded and reached the script as raw octets. Signed-off-by: Felix Fietkau <nbd@nbd.name>
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A libc that does not define SO_TIMESTAMPNS_OLD, musl among them, took SO_TIMESTAMP instead, which is the microsecond option. The control message table then held two entries for SO_TIMESTAMP and none for SO_TIMESTAMPNS, so a nanosecond receive timestamp was never decoded and reached the script as raw octets.