Gerd Hoffmann wrote:
To solve this in userland without kernel aio we'd need to open (not
just dup)
Why not just dup? I've implemented this and it seems to work.
unix keeps the file pointer in the (global) file table. The
(per-process) file descriptor table references the file table.
opening twice gives you two file descriptor table entries referencing
two file table entries. duping gives you two file descriptors
referencing the *same* file table entry. Thus the two fds share the
file pointer.
But opening twice means that you lose coherency with NFS.
I hate Unix.
Regards,
Anthony Liguori
HTH,
Gerd
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