man: document libsystemd-id128
This commit is contained in:
Lennart Poettering
parent
97595710b7
commit
1235509582
23
Makefile.am
23
Makefile.am
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@ -501,7 +501,10 @@ MANPAGES = \
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man/systemd-getty-generator.8 \
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man/systemd-system-update-generator.8 \
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man/systemd-fstab-generator.8 \
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man/systemd.preset.5
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man/systemd.preset.5 \
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man/sd-id128.7 \
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man/sd_id128_to_string.3 \
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man/sd_id128_randomize.3
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MANPAGES_ALIAS = \
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man/reboot.8 \
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@ -530,7 +533,15 @@ MANPAGES_ALIAS = \
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man/systemd-ask-password-wall.path.8 \
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man/systemd-tmpfiles-setup.service.8 \
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man/systemd-tmpfiles-clean.service.8 \
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man/systemd-tmpfiles-clean.timer.8
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man/systemd-tmpfiles-clean.timer.8 \
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man/sd_id128_t.7 \
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man/SD_ID128_MAKE.7 \
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man/SD_ID128_FORMAT_STR.7 \
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man/SD_ID128_FORMAT_VAL.7 \
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man/sd_id128_equal.7 \
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man/sd_id128_from_string.3 \
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man/sd_id128_get_machine.3 \
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man/sd_id128_get_boot.3
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man/reboot.8: man/halt.8
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man/poweroff.8: man/halt.8
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@ -559,6 +570,14 @@ man/systemd-ask-password-wall.path.8: man/systemd-ask-password-console.service.8
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man/systemd-tmpfiles-setup.service.8: man/systemd-tmpfiles.8
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man/systemd-tmpfiles-clean.service.8: man/systemd-tmpfiles.8
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man/systemd-tmpfiles-clean.timer.8: man/systemd-tmpfiles.8
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man/sd_id128_t.7: man/sd-id128.7
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man/SD_ID128_MAKE.7: man/sd-id128.7
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man/SD_ID128_FORMAT_STR.7: man/sd-id128.7
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man/SD_ID128_FORMAT_VAL.7: man/sd-id128.7
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man/sd_id128_equal.7: man/sd-id128.7
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man/sd_id128_from_string.3: man/sd_id128_to_string.3
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man/sd_id128_get_machine.3: man/sd_id128_randomize.3
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man/sd_id128_get_boot.3: man/sd_id128_randomize.3
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XML_FILES = \
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${patsubst %.1,%.xml,${patsubst %.3,%.xml,${patsubst %.5,%.xml,${patsubst %.7,%.xml,${patsubst %.8,%.xml,$(MANPAGES)}}}}}
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4
TODO
4
TODO
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@ -22,6 +22,10 @@ Bugfixes:
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Features:
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* journalctl highlight reboots
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* Merge KillUnit()'s mode and who params into one
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* load-fragment: when loading a unit file via a chain of symlinks
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verify that it isn't masked via any of the names traversed.
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@ -136,7 +136,9 @@ id[8] = (id[8] & 0x3F) | 0x80;</programlisting>
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<citerefentry><refentrytitle>gethostid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>hostname</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>machine-info</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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<citerefentry><refentrytitle>os-release</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_get_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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@ -0,0 +1,168 @@
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<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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|
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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||||
Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd-id128">
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<refentryinfo>
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<title>sd-id128</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd-id128</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd-id128</refname>
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<refname>sd_id128_t</refname>
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<refname>SD_ID128_MAKE</refname>
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<refname>SD_ID128_FORMAT_STR</refname>
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<refname>SD_ID128_FORMAT_VAL</refname>
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<refname>sd_id128_equal</refname>
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<refpurpose>APIs for processing 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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</funcsynopsis>
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<cmdsynopsis>
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<command>pkg-config --cflags --libs libsystemd-id128</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>sd-id128.h</filename> provides APIs to
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process and generate 128 bit ID values. The 128 bit ID
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values processed and generated by these APIs are a
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generalization of OSF UUIDs as defined by <ulink
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url="http://tools.ietf.org/html/rfc4122">RFC
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4122</ulink>, though use a simpler string
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formatting. These functions impose no structure on the
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used IDs, much unlike OSF UUIDs or Microsoft GUIDs,
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but are fully compatible with those types of IDs.
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</para>
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<para>See
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<citerefentry><refentrytitle>sd_id128_to_string</refentrytitle><manvolnum>3</manvolnum></citerefentry> and
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<citerefentry><refentrytitle>sd_id128_randomize</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for more information about the functions
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implemented.</para>
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<para>A 128 bit ID is implemented as the following
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union type:</para>
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<programlisting>typedef union sd_id128 {
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uint8_t bytes[16];
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uint64_t qwords[2];
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} sd_id128_t;</programlisting>
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<para>This union type allows accessing the 128 bit ID
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as 16 separate bytes or 2 64 bit words. It is generally
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safer to access the ID components by their 8 bit array
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to avoid endianess issues. This union is intended to
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be passed call-by-value (as opposed to
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call-by-reference) and may be directly manipulated by
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clients.</para>
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<para>A couple of macros are defined to denote and
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decode 128 bit IDs:</para>
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<para><function>SD_ID128_MAKE()</function> may be used
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to write a 128 bit ID in source code. A commonly used
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idiom is to give 128 bit IDs names using this macro:</para>
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<programlisting>#define SD_MESSAGE_COREDUMP SD_ID128_MAKE(fc,2e,22,bc,6e,e6,47,b6,b9,07,29,ab,34,a2,50,b1)</programlisting>
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<para><function>SD_ID128_FORMAT_STR</function> and
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<function>SD_ID128_FORMAT_VAL()</function> may be used
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to format a 128 bit ID in a
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<citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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format string, as shown in the following
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example:</para>
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<programlisting>int main(int argc, char *argv[]) {
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sd_id128_t id;
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id = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07);
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printf("The ID encoded in this C file is " SD_ID128_FORMAT_STR ".\n", SD_ID128_FORMAT_VAL(id));
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return 0;
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}</programlisting>
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<para>Use <function>sd_id128_equal()</function> to compare two 128 bit IDs:</para>
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<programlisting>int main(int argc, char *argv[]) {
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sd_id128_t a, b, c;
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a = SD_ID128_MAKE(ee,89,be,71,bd,6e,43,d6,91,e6,c5,5d,eb,03,02,07);
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b = SD_ID128_MAKE(f2,28,88,9c,5f,09,44,15,9d,d7,04,77,58,cb,e7,3e);
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c = a;
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assert(sd_id128_equal(a, c));
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assert(!sd_id128_equal(a, b));
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return 0;
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}</programlisting>
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<para>Note that new, randomized IDs may be generated
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with
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<literal>--new-id</literal> command.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>These APIs are implemented as shared library,
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which can be compiled and linked to with the
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<literal>libsystemd-id128</literal>
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<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_to_string</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_randomize</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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@ -0,0 +1,157 @@
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<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd is distributed in the hope that it will be useful, but
|
||||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
-->
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<refentry id="sd_id128_randomize">
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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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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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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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<refname>sd_id128_get_machine</refname>
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<refname>sd_id128_get_boot</refname>
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<refpurpose>Generate or retrieve 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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<funcprototype>
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<funcdef>int <function>sd_id128_get_machine</function></funcdef>
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<paramdef>sd_id128_t* <parameter>ret</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_id128_get_boot</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>
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generates a new randomized 128 bit ID and returns it
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in <parameter>ret</parameter>. Every invocation
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returns a new randomly generated ID. This uses the
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<filename>/dev/urandom</filename> kernel random number
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generator.</para>
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<para><function>sd_id128_get_machine()</function>
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returns the machine ID of the executing host. This
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reads and parses the
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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file. This function caches the machine ID internally
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to make retrieving the machine ID a cheap
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operation.</para>
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<para><function>sd_id128_get_boot()</function> returns
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the boot ID of the executing kernel. This reads and
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parses the
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<filename>/proc/sys/kernel/random/boot_id</filename>
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file exposed by the kernel. It is randomly generated
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early at boot and is unique for every running kernel
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instance. See
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<citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>
|
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for more information. This function also internally
|
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caches the returned ID to make this call a cheap
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operation.</para>
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<para>Note that
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<function>sd_id128_randomize()</function> and
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<function>sd_id128_get_boot()</function> always return
|
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a UUID v4 compatible
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ID. <function>sd_id128_get_machine()</function> will
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also return a UUID v4 compatible ID on new
|
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installations, but might not on older. It is possible
|
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to convert the machine ID into an UUID v4 compatible
|
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one. For more information see
|
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
|
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|
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<para>For more information about the
|
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<literal>sd_id128_t</literal> type see
|
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
|
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|
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<para><citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
|
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<literal>--new-id</literal> command may be used as
|
||||
command line front-end for
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<function>sd_id128_randomize()</function>.</para>
|
||||
</refsect1>
|
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<refsect1>
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<title>Return Value</title>
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<para>The three calls returns 0 on success (in which
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case <parameter>ret</parameter> is filled in), or a
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negative errno-style error code.</para>
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</refsect1>
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<refsect1>
|
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<title>Notes</title>
|
||||
|
||||
<para>The <function>sd_id128_randomize()</function>,
|
||||
<function>sd_id128_get_machine()</function> and
|
||||
<function>sd_id128_get_boot()</function> interfaces
|
||||
are available as shared library, which can be compiled
|
||||
and linked to with the
|
||||
<literal>libsystemd-id128</literal>
|
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<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
||||
file.</para>
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</refsect1>
|
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|
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<refsect1>
|
||||
<title>See Also</title>
|
||||
|
||||
<para>
|
||||
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
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<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
||||
<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
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<citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>
|
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</para>
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</refsect1>
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|
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</refentry>
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|
|
@ -0,0 +1,131 @@
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|||
<?xml version='1.0'?> <!--*-nxml-*-->
|
||||
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
||||
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
||||
|
||||
<!--
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2012 Lennart Poettering
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd is distributed in the hope that it will be useful, but
|
||||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
-->
|
||||
|
||||
<refentry id="sd_id128_to_string">
|
||||
|
||||
<refentryinfo>
|
||||
<title>sd_id128_to_string</title>
|
||||
<productname>systemd</productname>
|
||||
|
||||
<authorgroup>
|
||||
<author>
|
||||
<contrib>Developer</contrib>
|
||||
<firstname>Lennart</firstname>
|
||||
<surname>Poettering</surname>
|
||||
<email>lennart@poettering.net</email>
|
||||
</author>
|
||||
</authorgroup>
|
||||
</refentryinfo>
|
||||
|
||||
<refmeta>
|
||||
<refentrytitle>sd_id128_to_string</refentrytitle>
|
||||
<manvolnum>3</manvolnum>
|
||||
</refmeta>
|
||||
|
||||
<refnamediv>
|
||||
<refname>sd_id128_to_string</refname>
|
||||
<refname>sd_id128_from_string</refname>
|
||||
<refpurpose>Format or parse 128 bit IDs as strings</refpurpose>
|
||||
</refnamediv>
|
||||
|
||||
<refsynopsisdiv>
|
||||
<funcsynopsis>
|
||||
<funcsynopsisinfo>#include <systemd/sd-id128.h></funcsynopsisinfo>
|
||||
|
||||
<funcprototype>
|
||||
<funcdef>char* <function>sd_id128_to_string</function></funcdef>
|
||||
<paramdef>sd_id128_t <parameter>id</parameter>, char <parameter>s</parameter>[33]</paramdef>
|
||||
</funcprototype>
|
||||
|
||||
<funcprototype>
|
||||
<funcdef>int <function>sd_id128_from_string</function></funcdef>
|
||||
<paramdef>const char <parameter>s</parameter>[33], sd_id128_t* <parameter>ret</parameter></paramdef>
|
||||
</funcprototype>
|
||||
|
||||
</funcsynopsis>
|
||||
</refsynopsisdiv>
|
||||
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
|
||||
<para><function>sd_id128_to_string()</function>
|
||||
formats a 128 bit ID as character string. It expects
|
||||
the ID and a string array capable of storing 33
|
||||
characters. The ID will be formatted as 32 lowercase
|
||||
hexadecimal digits and be terminated by a NUL
|
||||
byte.</para>
|
||||
|
||||
<para><function>sd_id128_from_string()</function>
|
||||
implements the reverse operation: it takes a 33
|
||||
character array with 32 hexadecimial digits
|
||||
(terminated by NUL) and parses them back into an
|
||||
128 bit ID returned in
|
||||
<parameter>ret</parameter>.</para>
|
||||
|
||||
<para>For more information about the
|
||||
<literal>sd_id128_t</literal> type see
|
||||
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
|
||||
|
||||
<para>When formatting a 128 bit ID into a string it is
|
||||
often easier to use a format string for
|
||||
<citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>. This
|
||||
is easly done using the
|
||||
<function>SD_ID128_FORMAT_STR</function> and
|
||||
<function>SD_ID128_FORMAT_VAL()</function> macros. For
|
||||
more information see
|
||||
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Return Value</title>
|
||||
|
||||
<para><function>sd_id128_to_string()</function> always
|
||||
succeeds and returns a pointer to the string array
|
||||
passed in. <function>sd_id128_from_string</function>
|
||||
returns 0 on success (in which case
|
||||
<parameter>ret</parameter> is filled in), or a negative
|
||||
errno-style error code.</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Notes</title>
|
||||
|
||||
<para>The <function>sd_id128_to_string()</function>
|
||||
and <function>sd_id128_from_string()</function> interfaces are
|
||||
available as shared library, which can be compiled and
|
||||
linked to with the <literal>libsystemd-id128</literal>
|
||||
<citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
||||
file.</para>
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>See Also</title>
|
||||
|
||||
<para>
|
||||
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||||
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
||||
<citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||||
</para>
|
||||
</refsect1>
|
||||
|
||||
</refentry>
|
||||
Loading…
Reference in New Issue