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If /dev/tty did not exist, or had st_rdev == 0, we ignored it. And the same is true for null, zero, full, random, urandom. If /dev/ptmx did not exist, we treated this as a failure. If /dev/ptmx had st_rdev == 0, we ignored it. This was a very recent change, but there was no reason for ptmx creation specifically to treat st_rdev == 0 differently from non-existence. This confuses me when reading it. Change the creation of /dev/ptmx so that st_rdev == 0 is treated as failure. This still leaves /dev/ptmx as a special case with stricter handling. However it is consistent with the immediately preceding creation of /dev/pts/, which is treated as essential, and is directly related to ptmx. I don't know why we check st_rdev. But I'd prefer to have only one unanswered question here, and not to have a second unanswered question added on top.
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