sd_id128_randomize

systemd

sd_id128_randomize

Generate 128-bit IDs

#include <systemd/sd-id128.h>

int

sd_id128_randomize

sd_id128_t *

ret

Description

sd_id128_randomize() generates a new randomized 128-bit ID and returns it in ret. Every invocation returns a new randomly generated ID. This uses the getrandom(2) kernel random number generator.

Note that sd_id128_randomize() always returns a UUID Variant 1 Version 4 compatible ID. It is hence guaranteed that this function will never return the ID consisting of all zero or all one bits (SD_ID128_NULL, SD_ID128_ALLF).

For more information about the sd_id128_t type, see sd-id128(3).

systemd-id128(1)'s new command may be used as a command line front-end for sd_id128_randomize().

Return Value

The call returns 0 on success (in which case ret is filled in), or a negative errno-style error code.

History

sd_id128_randomize() was added in version 187.