Followup to: <20050208140538.12557.qmail@xxxxxxxxxxxxxxxxxxx>
By author: linux@xxxxxxxxxxx
In newsgroup: linux.dev.raid
>
> + if ((my_fd = open("/dev/random", O_RDONLY)) != -1) {
>
> Please use /dev/urandom for such applications. /dev/random is the
> highest-quality generator, but will block if entropy isn't available.
> /dev/urandom provides the best available, immediately, which is what
> this application wants.
Not 100% clear; the best would be to make it configurable.
Either way you must not use read() in the way described. Short reads
happen, even with /dev/urandom.
> Also, this will only produce 2^32 possible UUIDs, since that's the
> size of the seed. Meaning that after you've generated 2^16 of them,
> the chances are excellent that they're not UU any more.
>
> You might just want to get all 128 (minus epsilon) bits from /dev/urandom
> directly.
You *do* want to get all bits from /dev/urandom directly.
-hpa
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