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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
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4 | |
5 | <!-- | |
572eb058 | 6 | SPDX-License-Identifier: LGPL-2.1+ |
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7 | --> |
8 | ||
7d6b2723 | 9 | <refentry id="sd_id128_randomize" xmlns:xi="http://www.w3.org/2001/XInclude"> |
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11 | <refentryinfo> |
12 | <title>sd_id128_randomize</title> | |
13 | <productname>systemd</productname> | |
14 | ||
15 | <authorgroup> | |
16 | <author> | |
17 | <contrib>Developer</contrib> | |
18 | <firstname>Lennart</firstname> | |
19 | <surname>Poettering</surname> | |
20 | <email>lennart@poettering.net</email> | |
21 | </author> | |
22 | </authorgroup> | |
23 | </refentryinfo> | |
24 | ||
25 | <refmeta> | |
26 | <refentrytitle>sd_id128_randomize</refentrytitle> | |
27 | <manvolnum>3</manvolnum> | |
28 | </refmeta> | |
29 | ||
30 | <refnamediv> | |
31 | <refname>sd_id128_randomize</refname> | |
32 | <refpurpose>Generate 128-bit IDs</refpurpose> | |
33 | </refnamediv> | |
34 | ||
35 | <refsynopsisdiv> | |
36 | <funcsynopsis> | |
37 | <funcsynopsisinfo>#include <systemd/sd-id128.h></funcsynopsisinfo> | |
38 | ||
39 | <funcprototype> | |
40 | <funcdef>int <function>sd_id128_randomize</function></funcdef> | |
41 | <paramdef>sd_id128_t *<parameter>ret</parameter></paramdef> | |
42 | </funcprototype> | |
43 | ||
44 | </funcsynopsis> | |
45 | </refsynopsisdiv> | |
46 | ||
47 | <refsect1> | |
48 | <title>Description</title> | |
49 | ||
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 | |
55 | generator.</para> | |
56 | ||
57 | <para>Note that <function>sd_id128_randomize()</function> always | |
58 | returns a UUID v4-compatible ID.</para> | |
59 | ||
60 | <para>For more information about the <literal>sd_id128_t</literal> | |
61 | type, see | |
62 | <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> | |
63 | ||
64 | <para><citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s | |
eda8c27f | 65 | <option>--new-id128</option> option may be used as a command line |
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66 | front-end for <function>sd_id128_randomize()</function>.</para> |
67 | </refsect1> | |
68 | ||
69 | <refsect1> | |
70 | <title>Return Value</title> | |
71 | ||
72 | <para>The call returns 0 on success (in which case | |
73 | <parameter>ret</parameter> is filled in), or a negative | |
74 | errno-style error code.</para> | |
75 | </refsect1> | |
76 | ||
7d6b2723 | 77 | <xi:include href="libsystemd-pkgconfig.xml" /> |
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78 | |
79 | <refsect1> | |
80 | <title>See Also</title> | |
81 | ||
82 | <para> | |
83 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
84 | <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
85 | <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
86 | <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>, | |
87 | <citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
88 | </para> | |
89 | </refsect1> | |
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90 | |
91 | </refentry> |