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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 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2012 Lennart Poettering | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | --> | |
23 | ||
24 | <refentry id="sd_journal_get_cutoff_realtime_usec"> | |
25 | ||
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26 | <refentryinfo> |
27 | <title>sd_journal_get_cutoff_realtime_usec</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>Developer</contrib> | |
33 | <firstname>Lennart</firstname> | |
34 | <surname>Poettering</surname> | |
35 | <email>lennart@poettering.net</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle> | |
42 | <manvolnum>3</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>sd_journal_get_cutoff_realtime_usec</refname> | |
47 | <refname>sd_journal_get_cutoff_monotonic_usec</refname> | |
48 | <refpurpose>Read cut-off timestamps from the current journal entry</refpurpose> | |
49 | </refnamediv> | |
50 | ||
51 | <refsynopsisdiv> | |
52 | <funcsynopsis> | |
53 | <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> | |
54 | ||
55 | <funcprototype> | |
56 | <funcdef>int <function>sd_journal_get_cutoff_realtime_usec</function></funcdef> | |
57 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> | |
58 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> | |
59 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
60 | </funcprototype> | |
61 | ||
62 | <funcprototype> | |
63 | <funcdef>int <function>sd_journal_get_cutoff_monotonic_usec</function></funcdef> | |
64 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> | |
65 | <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> | |
66 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> | |
67 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
68 | </funcprototype> | |
69 | ||
70 | </funcsynopsis> | |
71 | </refsynopsisdiv> | |
72 | ||
73 | <refsect1> | |
74 | <title>Description</title> | |
75 | ||
76 | <para><function>sd_journal_get_cutoff_realtime_usec()</function> | |
77 | retrieves the realtime (wallclock) timestamps of the first and | |
78 | last entries accessible in the journal. It takes three arguments: | |
79 | the journal context object <parameter>j</parameter> and two | |
80 | pointers <parameter>from</parameter> and <parameter>to</parameter> | |
81 | pointing at 64-bit unsigned integers to store the timestamps in. | |
82 | The timestamps are in microseconds since the epoch, i.e. | |
83 | <constant>CLOCK_REALTIME</constant>. Either one of the two | |
84 | timestamp arguments may be passed as <constant>NULL</constant> in | |
85 | case the timestamp is not needed, but not both.</para> | |
86 | ||
87 | <para><function>sd_journal_get_cutoff_monotonic_usec()</function> | |
88 | retrieves the monotonic timestamps of the first and last entries | |
89 | accessible in the journal. It takes three arguments: the journal | |
90 | context object <parameter>j</parameter>, a 128-bit identifier for | |
91 | the boot <parameter>boot_id</parameter>, and two pointers to | |
92 | 64-bit unsigned integers to store the timestamps, | |
93 | <parameter>from</parameter> and <parameter>to</parameter>. The | |
94 | timestamps are in microseconds since boot-up of the specific boot, | |
95 | i.e. <constant>CLOCK_MONOTONIC</constant>. Since the monotonic | |
96 | clock begins new with every reboot it only defines a well-defined | |
97 | point in time when used together with an identifier identifying | |
98 | the boot, see | |
99 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
100 | for more information. The function will return the timestamps for | |
101 | the boot identified by the passed boot ID. Either one of the two | |
102 | timestamp arguments may be passed as <constant>NULL</constant> in | |
103 | case the timestamp is not needed, but not both.</para> | |
104 | </refsect1> | |
105 | ||
106 | <refsect1> | |
107 | <title>Return Value</title> | |
108 | ||
109 | <para><function>sd_journal_get_cutoff_realtime_usec()</function> | |
110 | and <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
111 | return 1 on success, 0 if not suitable entries are in the journal | |
112 | or a negative errno-style error code.</para> | |
113 | ||
114 | <para>Locations pointed to by parameters | |
115 | <parameter>from</parameter> and <parameter>to</parameter> will be | |
116 | set only if the return value is positive, and obviously, the | |
117 | parameters are non-null.</para> | |
118 | </refsect1> | |
119 | ||
120 | <refsect1> | |
121 | <title>Notes</title> | |
122 | ||
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123 | <para>All functions listed here are thread-agnostic and only a single thread may operate |
124 | on a given <structname>sd_journal</structname> object.</para> | |
125 | ||
798d3a52 ZJS |
126 | <para>The |
127 | <function>sd_journal_get_cutoff_realtime_usec()</function> and | |
128 | <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
129 | interfaces are available as a shared library, which can be | |
130 | compiled and linked to with the | |
131 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
132 | file.</para> | |
133 | </refsect1> | |
134 | ||
135 | <refsect1> | |
136 | <title>See Also</title> | |
137 | ||
138 | <para> | |
139 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
140 | <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
141 | <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
142 | <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
143 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
144 | <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry> | |
145 | </para> | |
146 | </refsect1> | |
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147 | |
148 | </refentry> |