Re: Suggestion for a new system call: convert file handle to a cookie for transfering file handles between processes.

From: RAMON_GARCIA_F (RAMON_GARCIA_F_at_terra.es)
Date: 07/21/03

  • Next message: Michael Abshoff: "Re: Problems with kernel 2.5.75 (Urgent)" 
    To: linux-kernel@vger.kernel.org
Date:	Mon, 21 Jul 2003 18:55:24 +0200

    My proposal is useful for cases where the server program is running with
    a different priviledge from the user invoking it. Examples where this
    behaviour is useful are writting CDs, saving man pages, saving TeX cache
    files, where full access to a resource would be unsafe, but limited
    access through an intermediate server is safe.

    In addition, this proposal is useful for cases where the server process
    cannot access the named file, becaue it does not have permission to do
    so, or because it is anonymous (example: a pipe).

    I can't see why cookies introduce circular references. A cookie referes
    to an inode, but an inode does not refer to a file.

    However, a cookie introduces a permanent reference to a file handle.
    This reference is not destroyed until the cookie is used. Therefore,
    cookies should have a timeout associated with them, so that if they
    are not consumed they should be destroyed.

    Ramon

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  • Next message: Michael Abshoff: "Re: Problems with kernel 2.5.75 (Urgent)"

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