8.13.0.7
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) "8f32c314-24b3-4897-97d0-467756cc"
> (uuid-generate) "3517cfd9-ae6e-4876-94e4-c288d6c0"
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) "4c284c5e-d769-4821-825c-32e8436a"
> (uuid-generate/random) "1b8f82c5-64ad-47cc-bb63-83a89e05"
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) "3f1a8900-2f70-11ef-9db9-bf882816"
> (uuid-generate/time) "3f1aad90-2f70-11ef-9db9-bf882816"