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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"> | |
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 | ||
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> | |
4a010f4e | 48 | <refpurpose>Read cut-off timestamps from the current journal entry</refpurpose> |
b59866ae LP |
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> | |
3b3d7d06 JE |
57 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> |
58 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> | |
59 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
b59866ae LP |
60 | </funcprototype> |
61 | ||
62 | <funcprototype> | |
63 | <funcdef>int <function>sd_journal_get_cutoff_monotonic_usec</function></funcdef> | |
3b3d7d06 | 64 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> |
b59866ae | 65 | <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> |
3b3d7d06 JE |
66 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> |
67 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
b59866ae LP |
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> | |
1651e2c6 ZJS |
77 | retrieves the realtime (wallclock) timestamps of the |
78 | first and last entries accessible in the journal. It | |
79 | takes three arguments: the journal context object | |
80 | <parameter>j</parameter> and two pointers | |
81 | <parameter>from</parameter> and | |
82 | <parameter>to</parameter> pointing at 64-bit unsigned | |
83 | integers to store the timestamps in. The timestamps | |
84 | are in microseconds since the epoch, | |
74d00578 ZJS |
85 | i.e. <constant>CLOCK_REALTIME</constant>. Either one |
86 | of the two timestamp arguments may be passed as | |
87 | <constant>NULL</constant> in case the timestamp is not | |
88 | needed, but not both.</para> | |
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89 | |
90 | <para><function>sd_journal_get_cutoff_monotonic_usec()</function> | |
1651e2c6 ZJS |
91 | retrieves the monotonic timestamps of the first and |
92 | last entries accessible in the journal. It takes three | |
93 | arguments: the journal context object | |
94 | <parameter>j</parameter>, a 128-bit identifier for the | |
95 | boot <parameter>boot_id</parameter>, and two pointers | |
96 | to 64-bit unsigned integers to store the timestamps, | |
97 | <parameter>from</parameter> and | |
98 | <parameter>to</parameter>. The timestamps are in | |
99 | microseconds since boot-up of the specific boot, | |
74d00578 | 100 | i.e. <constant>CLOCK_MONOTONIC</constant>. Since the |
b59866ae LP |
101 | monotonic clock begins new with every reboot it only |
102 | defines a well-defined point in time when used | |
103 | together with an identifier identifying the boot, see | |
104 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
105 | for more information. The function will return the | |
106 | timestamps for the boot identified by the passed boot | |
107 | ID. Either one of the two timestamp arguments may be | |
74d00578 ZJS |
108 | passed as <constant>NULL</constant> in case the |
109 | timestamp is not needed, but not both.</para> | |
b59866ae LP |
110 | </refsect1> |
111 | ||
112 | <refsect1> | |
113 | <title>Return Value</title> | |
114 | ||
115 | <para><function>sd_journal_get_cutoff_realtime_usec()</function> | |
116 | and | |
117 | <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
118 | return 1 on success, 0 if not suitable entries are in | |
119 | the journal or a negative errno-style error code.</para> | |
1651e2c6 ZJS |
120 | |
121 | <para>Locations pointed to by parameters | |
122 | <parameter>from</parameter> and | |
123 | <parameter>to</parameter> will be set only if the | |
124 | return value is positive, and obviously, the | |
125 | parameters are non-null.</para> | |
b59866ae LP |
126 | </refsect1> |
127 | ||
128 | <refsect1> | |
129 | <title>Notes</title> | |
130 | ||
131 | <para>The | |
132 | <function>sd_journal_get_cutoff_realtime_usec()</function> | |
133 | and | |
134 | <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
494a6682 | 135 | interfaces are available as a shared library, which can |
b59866ae | 136 | be compiled and linked to with the |
5aded369 | 137 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> |
b59866ae LP |
138 | file.</para> |
139 | </refsect1> | |
140 | ||
141 | <refsect1> | |
142 | <title>See Also</title> | |
143 | ||
144 | <para> | |
145 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
146 | <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
147 | <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
148 | <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
149 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
150 | <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry> | |
151 | </para> | |
152 | </refsect1> | |
153 | ||
154 | </refentry> |