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    SubjectRe: Thread implementations...
    On Thu, Jun 18, 1998 at 10:57:35PM -0700, Dean Gaudet wrote:

    > Briefly, an extended file handle is a global index, all processes get
    > handles out of this single space. To implement access rights you place an
    > extra field in each file structure, call it file_access_right. Each
    > process also has a file_access_right, they have to compare equal for the
    > handle's use to be permitted. exec() causes a new file_access_right to be
    > selected. fork() uses the same file_access_right (to set up exec),
    > clone() uses the same file_access_right.

    This could perhaps be done using the existing semantics where instead of
    having one global table, have a two layer approach. So you do a lookup on
    descriptor(fd,pid) and then use that as a lookup into a global table.

    That hopefully wouldn't be too expensive, although could be excessively


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