Getting a safe path for a temporary file

[Cym13]

On Sunday, 18 January 2015 at 16:00:32 UTC, Kagamin wrote:
> On Sunday, 18 January 2015 at 11:21:52 UTC, Marc Schütz wrote:
>> It's not different, and if you're still doing the O_EXCL open 
>> afterwards, it's safe. I just assumed you were going to use 
>> the generated filename without a further check. This is then 
>> unsafe, no matter how the UUID is generated, and depending on 
>> the RNG that's been used, they can be quite predictable. 
>> Granted, the risk is low, but still...
>
> tmpfile is more predictable: it generates sequential file names.

Being predictable is only an issue if the file is wrongly used 
(ie: no check that it might already exist, or be a symlink or 
check at the wrong time leaving an exploitable time frame etc). 
Sequential file names are a good way to provide uniqueness over a 
single system after all.