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 This file is part of elogind.
7 SPDX-License-Identifier: LGPL-2.1+
10 Copyright 2012 Lennart Poettering
13 <refentry id="sd_id128_randomize" xmlns:xi="http://www.w3.org/2001/XInclude">
16 <title>sd_id128_randomize</title>
17 <productname>elogind</productname>
21 <contrib>Developer</contrib>
22 <firstname>Lennart</firstname>
23 <surname>Poettering</surname>
24 <email>lennart@poettering.net</email>
30 <refentrytitle>sd_id128_randomize</refentrytitle>
31 <manvolnum>3</manvolnum>
35 <refname>sd_id128_randomize</refname>
36 <refpurpose>Generate 128-bit IDs</refpurpose>
41 <funcsynopsisinfo>#include <elogind/sd-id128.h></funcsynopsisinfo>
44 <funcdef>int <function>sd_id128_randomize</function></funcdef>
45 <paramdef>sd_id128_t *<parameter>ret</parameter></paramdef>
52 <title>Description</title>
54 <para><function>sd_id128_randomize()</function> generates a new
55 randomized 128-bit ID and returns it in
56 <parameter>ret</parameter>. Every invocation returns a new
57 randomly generated ID. This uses the
58 <filename>/dev/urandom</filename> kernel random number
61 <para>Note that <function>sd_id128_randomize()</function> always
62 returns a UUID v4-compatible ID.</para>
64 <para>For more information about the <literal>sd_id128_t</literal>
66 <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
68 <!-- 0 /// elogind does not support journalctl
69 <para><citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
70 <option>--new-id128</option> option may be used as a command line
71 front-end for <function>sd_id128_randomize()</function>.</para>
76 <title>Return Value</title>
78 <para>The call returns 0 on success (in which case
79 <parameter>ret</parameter> is filled in), or a negative
80 errno-style error code.</para>
83 <xi:include href="libelogind-pkgconfig.xml" />
86 <title>See Also</title>
89 <!-- 0 /// elogind is in section 8
90 <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
92 <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
94 <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
95 <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
96 <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>,
97 <citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>