8.14.0.1
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) "a5cdd28f-b74d-4968-94a0-eb83083d"
> (uuid-generate) "acc05446-2363-4c03-8624-445f73a0"
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) "289c11e0-a7fb-4fdf-8e98-1ff6a5e3"
> (uuid-generate/random) "54f3892a-b80b-4b55-a86c-bdde3fff"
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) "dcd7fe9c-461e-11ef-a848-d3c6766f"
> (uuid-generate/time) "dcd82b74-461e-11ef-a848-d3c6766f"