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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 | <!-- | |
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6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2012 Lennart Poettering | |
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11 | --> |
12 | ||
13 | <refentry id="sd_journal_get_cutoff_realtime_usec"> | |
14 | ||
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15 | <refentryinfo> |
16 | <title>sd_journal_get_cutoff_realtime_usec</title> | |
17 | <productname>systemd</productname> | |
18 | ||
19 | <authorgroup> | |
20 | <author> | |
21 | <contrib>Developer</contrib> | |
22 | <firstname>Lennart</firstname> | |
23 | <surname>Poettering</surname> | |
24 | <email>lennart@poettering.net</email> | |
25 | </author> | |
26 | </authorgroup> | |
27 | </refentryinfo> | |
28 | ||
29 | <refmeta> | |
30 | <refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle> | |
31 | <manvolnum>3</manvolnum> | |
32 | </refmeta> | |
33 | ||
34 | <refnamediv> | |
35 | <refname>sd_journal_get_cutoff_realtime_usec</refname> | |
36 | <refname>sd_journal_get_cutoff_monotonic_usec</refname> | |
37 | <refpurpose>Read cut-off timestamps from the current journal entry</refpurpose> | |
38 | </refnamediv> | |
39 | ||
40 | <refsynopsisdiv> | |
41 | <funcsynopsis> | |
42 | <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> | |
43 | ||
44 | <funcprototype> | |
45 | <funcdef>int <function>sd_journal_get_cutoff_realtime_usec</function></funcdef> | |
46 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> | |
47 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> | |
48 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
49 | </funcprototype> | |
50 | ||
51 | <funcprototype> | |
52 | <funcdef>int <function>sd_journal_get_cutoff_monotonic_usec</function></funcdef> | |
53 | <paramdef>sd_journal *<parameter>j</parameter></paramdef> | |
54 | <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> | |
55 | <paramdef>uint64_t *<parameter>from</parameter></paramdef> | |
56 | <paramdef>uint64_t *<parameter>to</parameter></paramdef> | |
57 | </funcprototype> | |
58 | ||
59 | </funcsynopsis> | |
60 | </refsynopsisdiv> | |
61 | ||
62 | <refsect1> | |
63 | <title>Description</title> | |
64 | ||
65 | <para><function>sd_journal_get_cutoff_realtime_usec()</function> | |
66 | retrieves the realtime (wallclock) timestamps of the first and | |
67 | last entries accessible in the journal. It takes three arguments: | |
68 | the journal context object <parameter>j</parameter> and two | |
69 | pointers <parameter>from</parameter> and <parameter>to</parameter> | |
70 | pointing at 64-bit unsigned integers to store the timestamps in. | |
71 | The timestamps are in microseconds since the epoch, i.e. | |
72 | <constant>CLOCK_REALTIME</constant>. Either one of the two | |
73 | timestamp arguments may be passed as <constant>NULL</constant> in | |
74 | case the timestamp is not needed, but not both.</para> | |
75 | ||
76 | <para><function>sd_journal_get_cutoff_monotonic_usec()</function> | |
77 | retrieves the monotonic timestamps of the first and last entries | |
78 | accessible in the journal. It takes three arguments: the journal | |
79 | context object <parameter>j</parameter>, a 128-bit identifier for | |
80 | the boot <parameter>boot_id</parameter>, and two pointers to | |
81 | 64-bit unsigned integers to store the timestamps, | |
82 | <parameter>from</parameter> and <parameter>to</parameter>. The | |
83 | timestamps are in microseconds since boot-up of the specific boot, | |
84 | i.e. <constant>CLOCK_MONOTONIC</constant>. Since the monotonic | |
85 | clock begins new with every reboot it only defines a well-defined | |
86 | point in time when used together with an identifier identifying | |
87 | the boot, see | |
88 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
89 | for more information. The function will return the timestamps for | |
90 | the boot identified by the passed boot ID. Either one of the two | |
91 | timestamp arguments may be passed as <constant>NULL</constant> in | |
92 | case the timestamp is not needed, but not both.</para> | |
93 | </refsect1> | |
94 | ||
95 | <refsect1> | |
96 | <title>Return Value</title> | |
97 | ||
98 | <para><function>sd_journal_get_cutoff_realtime_usec()</function> | |
99 | and <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
100 | return 1 on success, 0 if not suitable entries are in the journal | |
101 | or a negative errno-style error code.</para> | |
102 | ||
103 | <para>Locations pointed to by parameters | |
104 | <parameter>from</parameter> and <parameter>to</parameter> will be | |
105 | set only if the return value is positive, and obviously, the | |
106 | parameters are non-null.</para> | |
107 | </refsect1> | |
108 | ||
109 | <refsect1> | |
110 | <title>Notes</title> | |
111 | ||
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112 | <para>All functions listed here are thread-agnostic and only a single thread may operate |
113 | on a given <structname>sd_journal</structname> object.</para> | |
114 | ||
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115 | <para>The |
116 | <function>sd_journal_get_cutoff_realtime_usec()</function> and | |
117 | <function>sd_journal_get_cutoff_monotonic_usec()</function> | |
118 | interfaces are available as a shared library, which can be | |
119 | compiled and linked to with the | |
120 | <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
121 | file.</para> | |
122 | </refsect1> | |
123 | ||
124 | <refsect1> | |
125 | <title>See Also</title> | |
126 | ||
127 | <para> | |
128 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
129 | <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
130 | <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
131 | <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
132 | <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
133 | <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry> | |
134 | </para> | |
135 | </refsect1> | |
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136 | |
137 | </refentry> |