table of contents
- bookworm 252.30-1~deb12u2
- bookworm-backports 254.16-1~bpo12+1
- testing 256.5-1
- unstable 256.6-1
SD_ID128_RANDOMIZE(3) | sd_id128_randomize | SD_ID128_RANDOMIZE(3) |
NAME¶
sd_id128_randomize - Generate 128-bit IDs
SYNOPSIS¶
#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.
NOTES¶
Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd pkg-config(1) file.
The code described here uses getenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call setenv(3) from a parallel thread. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started.
HISTORY¶
sd_id128_randomize() was added in version 187.
SEE ALSO¶
systemd(1), sd-id128(3), machine-id(5), getrandom(2), random(4), sd_id128_get_machine(3)
systemd 256.6 |