On 1/30/06, Bernard Blackham <[email protected]> wrote:
> A useful thing to be able to determine when checkpointing a process
> from userspace is whether two file descriptors that point to the
> same file are
> (a) two independently open()'d instances of the file; or
> (b) one open() and one dup().
> (the latter case meaning the FDs share locks & seek offsets).
>
I dont see a way which differentiates between open fd & dup fd. The
only difference between them is that when doing open it allocates a
new file structure & initializes it while in case of dup the same file
pointer. That's how you share the locks & seek offsets. But I dont see
any kernel code which makes this difference currently. Implementing
this should not be that hard any way
regards
Ram Gupta
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