Man page - sd_id128_randomize(3)

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SD_ID128_RANDOMIZE

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
NOTES
HISTORY
SEE ALSO

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.