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Diffstat (limited to 'src/libsystemd/sd_journal_get_cutoff_realtime_usec.xml')
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diff --git a/src/libsystemd/sd_journal_get_cutoff_realtime_usec.xml b/src/libsystemd/sd_journal_get_cutoff_realtime_usec.xml new file mode 100644 index 0000000000..0950e11b44 --- /dev/null +++ b/src/libsystemd/sd_journal_get_cutoff_realtime_usec.xml @@ -0,0 +1,148 @@ +<?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_journal_get_cutoff_realtime_usec"> + + <refentryinfo> + <title>sd_journal_get_cutoff_realtime_usec</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_journal_get_cutoff_realtime_usec</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_journal_get_cutoff_realtime_usec</refname> + <refname>sd_journal_get_cutoff_monotonic_usec</refname> + <refpurpose>Read cut-off timestamps from the current journal entry</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_journal_get_cutoff_realtime_usec</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>uint64_t *<parameter>from</parameter></paramdef> + <paramdef>uint64_t *<parameter>to</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_get_cutoff_monotonic_usec</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> + <paramdef>uint64_t *<parameter>from</parameter></paramdef> + <paramdef>uint64_t *<parameter>to</parameter></paramdef> + </funcprototype> + + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_journal_get_cutoff_realtime_usec()</function> + retrieves the realtime (wallclock) timestamps of the first and + last entries accessible in the journal. It takes three arguments: + the journal context object <parameter>j</parameter> and two + pointers <parameter>from</parameter> and <parameter>to</parameter> + pointing at 64-bit unsigned integers to store the timestamps in. + The timestamps are in microseconds since the epoch, i.e. + <constant>CLOCK_REALTIME</constant>. Either one of the two + timestamp arguments may be passed as <constant>NULL</constant> in + case the timestamp is not needed, but not both.</para> + + <para><function>sd_journal_get_cutoff_monotonic_usec()</function> + retrieves the monotonic timestamps of the first and last entries + accessible in the journal. It takes three arguments: the journal + context object <parameter>j</parameter>, a 128-bit identifier for + the boot <parameter>boot_id</parameter>, and two pointers to + 64-bit unsigned integers to store the timestamps, + <parameter>from</parameter> and <parameter>to</parameter>. The + timestamps are in microseconds since boot-up of the specific boot, + i.e. <constant>CLOCK_MONOTONIC</constant>. Since the monotonic + clock begins new with every reboot it only defines a well-defined + point in time when used together with an identifier identifying + the boot, see + <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry> + for more information. The function will return the timestamps for + the boot identified by the passed boot ID. Either one of the two + timestamp arguments may be passed as <constant>NULL</constant> in + case the timestamp is not needed, but not both.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para><function>sd_journal_get_cutoff_realtime_usec()</function> + and <function>sd_journal_get_cutoff_monotonic_usec()</function> + return 1 on success, 0 if not suitable entries are in the journal + or a negative errno-style error code.</para> + + <para>Locations pointed to by parameters + <parameter>from</parameter> and <parameter>to</parameter> will be + set only if the return value is positive, and obviously, the + parameters are non-null.</para> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>All functions listed here are thread-agnostic and only a single thread may operate + on a given <structname>sd_journal</structname> object.</para> + + <para>The + <function>sd_journal_get_cutoff_realtime_usec()</function> and + <function>sd_journal_get_cutoff_monotonic_usec()</function> + interfaces are available as a shared library, which can be + compiled and linked to with the + <constant>libsystemd</constant> <citerefentry project='die-net'><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-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry> + </para> + </refsect1> + +</refentry> |