1 <?xml version='1.0'?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
3 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
6 SPDX-License-Identifier: LGPL-2.1+
9 <refentry id="sd_id128_randomize" xmlns:xi="http://www.w3.org/2001/XInclude">
12 <title>sd_id128_randomize</title>
13 <productname>elogind</productname>
17 <contrib>Developer</contrib>
18 <firstname>Lennart</firstname>
19 <surname>Poettering</surname>
20 <email>lennart@poettering.net</email>
26 <refentrytitle>sd_id128_randomize</refentrytitle>
27 <manvolnum>3</manvolnum>
31 <refname>sd_id128_randomize</refname>
32 <refpurpose>Generate 128-bit IDs</refpurpose>
37 <funcsynopsisinfo>#include <elogind/sd-id128.h></funcsynopsisinfo>
40 <funcdef>int <function>sd_id128_randomize</function></funcdef>
41 <paramdef>sd_id128_t *<parameter>ret</parameter></paramdef>
48 <title>Description</title>
50 <para><function>sd_id128_randomize()</function> generates a new
51 randomized 128-bit ID and returns it in
52 <parameter>ret</parameter>. Every invocation returns a new
53 randomly generated ID. This uses the
54 <filename>/dev/urandom</filename> kernel random number
57 <para>Note that <function>sd_id128_randomize()</function> always
58 returns a UUID v4-compatible ID.</para>
60 <para>For more information about the <literal>sd_id128_t</literal>
62 <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
64 <!-- 0 /// elogind does not support journalctl
65 <para><citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
66 <option>--new-id128</option> option may be used as a command line
67 front-end for <function>sd_id128_randomize()</function>.</para>
72 <title>Return Value</title>
74 <para>The call returns 0 on success (in which case
75 <parameter>ret</parameter> is filled in), or a negative
76 errno-style error code.</para>
79 <xi:include href="libelogind-pkgconfig.xml" />
82 <title>See Also</title>
85 <!-- 0 /// elogind is in section 8
86 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
88 <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
90 <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
91 <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
92 <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>,
93 <citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>