8.13.0.2
libuuid
Jan Dvorak <mordae@anilinux.org>
Interface to the libuuid library usable to generate high-quality UUIDs.
| (require libuuid) | package: libuuid |
procedure
(uuid-generate) → string?
Generate new universally unique identifier using /dev/urandom,
if available. If it is not available, use current time, local ethernet
MAC address and random data from a pseudo-random generator.
Examples:
> (uuid-generate) "26fb72ac-b9a9-4255-9f0d-1758cc43"
> (uuid-generate) "40723ca2-fd1d-4fe3-9b61-48b96dcd"
procedure
When /dev/urandom is available, same as uuid-generate,
but fails back to a pseudo-random generator only.
Can be used to prevent any chance of host’s MAC address leaking, at the cost of slightly higher chance of generating non-unique identifiers if the worst-case situation arises on multiple hosts.
Examples:
> (uuid-generate/random) "cb7d4fa7-bc97-416d-9189-44f0dd93"
> (uuid-generate/random) "e597f31d-3638-4555-af03-589a9ffa"
procedure
Same as uuid-generate when the /dev/urandom is missing.
Could potentially produce non-uniqueue identifiers if used concurrently so if you do not absolutely need sequential identifiers, stick with the generic (and safe) uuid-generate function above.
Examples:
> (uuid-generate/time) "6b798552-07af-11ef-9787-932ba9e7"
> (uuid-generate/time) "6b79a758-07af-11ef-9787-932ba9e7"