Hello guys,
it's been a while, but...
> What's bugging me is that 0 and O_EXCL give the same answer, and
> O_TRUNC and O_TRUNC | O_EXCL give the same answer,
This is ok, as (iirc) O_EXCL only has effect in the presence of O_CREAT.
(a comment to this effect would help here, as well as perhaps links to the CreateFile and open specs)
> but O_CREAT and O_CREAT | O_EXCL give different answers,
> as do O_CREAT | O_TRUNC and O_CREAT | O_TRUNC | O_EXCL.
See above.
> I'm also pretty suspicious of both O_CREAT | O_EXCL and
> O_CREAT | O_TRUNC | O_EXCL giving the same answer.
O_CREAT | O_EXCL is effectively "create, but fail if the file exists", which is the behaviour specified by CREATE_NEW.
AddingO_TRUNC to this combination, which can only apply to a successfully opened existent file, can have no impact
afaics.
Cheers,
Claudio
