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    Subjectsince when does linkat() on deleted /proc/$PID/fd/$num return ENOENT ?
    It used to be the case (last time I checked was around late 2008 or
    early 2009) that deleted entries from /proc/$PID/fd/ could be linked
    back to the filesystem by using linkat(,,,,AT_SYMLINK_FOLLOW).

    Now this just returns ENOENT.

    I'd like to understand when, how and why this change took place. What
    commit introduced it and was it a deliberate move (e.g., because the
    feature was a security issue of itself, or came into conflict with
    something else) or was it accidental? Does it depend on the /proc
    filesystem itself or on the target filesystem where the deleted file
    used to reside?

    (There's a Reddit thread, <URL:
    http://www.reddit.com/r/programming/comments/7yx6f/how_to_undelete_any_open_deleted_file_in_linux/
    >, where some people are reporting ENOENT on 2.6.27 or perhaps even
    2.6.26, which helps but a bound on the change.)

    (See also this thread: <URL:
    http://comments.gmane.org/gmane.linux.kernel/1224071
    >, where the question is not answered, however.)

    --
    David A. Madore
    ( http://www.madore.org/~david/ )


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