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Parents and children of check-in [66dddda0]

Make the unix VFS defensive against the error of having a database file open on file descriptors 1 or 2, as an error message might easily be written onto those file descriptors and thus overwrite and corrupt the database. check-in: 30d38cc4 user: drh tags: trunk
Change the unix VFS so that it refuses to open a database file using a file descriptor less than 3. Closed-Leaf check-in: 66dddda0 user: drh tags: overwrite-avoidance
Never leave an open file descriptor pointing into the middle of the database file if the file descriptor number is 2 or less. check-in: 3426673e user: drh tags: overwrite-avoidance