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Re: [Nmh-workers] extensions on tmp filenames?

2014-02-03 05:01:22
Hi David,

Well, the SUSv2 spec says:

I read this differently to you.

If the link named by the new argument exists, it shall be removed and
old renamed to new.

Good.

In this case, a link named new shall remain visible to other processes
throughout the renaming operation

IOW, other processes never observe `new' as missing.

and refer either to the file referred to by new

So the rename hasn't occurred yet in their eyes.

or old before the operation began.

The rename has occurred.

There's no `unstable' moment where it flitters between the two.  "rename
allows the new filename to refer to the old file, even if very briefly"
doesn't apply AFAICS.  rename("a", "b") has an existing ./b be the
existing contents up until the moment when it refers to ./a's contents
instead.

Cheers, Ralph.

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