•libuuid
libuuid
uuid-generate
uuid-generate/  random
uuid-generate/  time
6.2.901.900
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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)

"3f5e369b-e92d-4b1d-bff4-f06a61f88ed5"

> (uuid-generate)

"94e71c1f-03d9-45d5-b6aa-12489319b62b"

procedure

(uuid-generate/random) → string?

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)

"e7787f78-d62a-4e7a-bac9-fa016a3e64ff"

> (uuid-generate/random)

"4cfcc8ec-203b-40cd-adea-c99eab5d8df1"

procedure

(uuid-generate/time) → string?

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)

"b692f7fe-78e7-11e5-b170-080027c172e9"

> (uuid-generate/time)

"b6938f48-78e7-11e5-b170-080027c172e9"

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