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86 lines
3.4 KiB
XML
86 lines
3.4 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_id128_randomize" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_id128_randomize</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_id128_randomize</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_id128_randomize</refname>
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<refpurpose>Generate 128-bit IDs</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-id128.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_id128_randomize</function></funcdef>
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<paramdef>sd_id128_t *<parameter>ret</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_id128_randomize()</function> generates a new randomized 128-bit ID and returns it in
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<parameter>ret</parameter>. Every invocation returns a new randomly generated ID. This uses the
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<citerefentry
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project='man-pages'><refentrytitle>getrandom</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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kernel random number generator.</para>
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<para>Note that <function>sd_id128_randomize()</function> always returns a UUID Variant 1 Version 4
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compatible ID. It is hence guaranteed that this function will never return the ID consisting of all zero
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or all one bits (<constant>SD_ID128_NULL</constant>, <constant>SD_ID128_ALLF</constant>).</para>
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<para>For more information about the <literal>sd_id128_t</literal>
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type, see
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<para><citerefentry><refentrytitle>systemd-id128</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<command>new</command> command may be used as a command line front-end for
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<function>sd_id128_randomize()</function>.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>The call returns 0 on success (in which case
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<parameter>ret</parameter> is filled in), or a negative
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errno-style error code.</para>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>History</title>
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<para><function>sd_id128_randomize()</function> was added in version 187.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para><simplelist type="inline">
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<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>getrandom</refentrytitle><manvolnum>2</manvolnum></citerefentry></member>
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<member><citerefentry project='man-pages'><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry></member>
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<member><citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
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</simplelist></para>
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</refsect1>
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</refentry>
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