+ 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.
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.
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