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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_ID128_RANDOMIZE(3) sd_id128_randomize SD_ID128_RANDOMIZE(3)
sd_id128_randomize - Generate 128-bit IDs
#include <systemd/sd-id128.h>
int sd_id128_randomize(sd_id128_t *ret);
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().
The call returns 0 on success (in which case ret is filled in), or
a negative errno-style error code.
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.
sd_id128_randomize() was added in version 187.
systemd(1), sd-id128(3), machine-id(5), getrandom(2), random(4),
sd_id128_get_machine(3)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a
bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 258~rc2 SD_ID128_RANDOMIZE(3)
Pages that refer to this page: sd_bus_set_server(3), sd-id128(3), sd_id128_get_machine(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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