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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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SPDX-License-Identifier: LGPL-2.1+
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Copyright © 2016 Jan Synáček
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<refentry id= "sd_journal_has_runtime_files" xmlns:xi= "http://www.w3.org/2001/XInclude" >
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<refentryinfo >
<title > sd_journal_has_runtime_files</title>
<productname > systemd</productname>
</refentryinfo>
<refmeta >
<refentrytitle > sd_journal_has_runtime_files</refentrytitle>
<manvolnum > 3</manvolnum>
</refmeta>
<refnamediv >
<refname > sd_journal_has_runtime_files</refname>
<refname > sd_journal_has_persistent_files</refname>
<refpurpose > Query availability of runtime or persistent journal files.</refpurpose>
</refnamediv>
<refsynopsisdiv >
<funcsynopsis >
<funcsynopsisinfo > #include < systemd/sd-journal.h> </funcsynopsisinfo>
<funcprototype >
<funcdef > int <function > sd_journal_has_runtime_files</function> </funcdef>
<paramdef > sd_journal *<parameter > j</parameter> </paramdef>
</funcprototype>
<funcprototype >
<funcdef > int <function > sd_journal_has_persistent_files</function> </funcdef>
<paramdef > sd_journal *<parameter > j</parameter> </paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 >
<title > Description</title>
<para > <function > sd_journal_has_runtime_files()</function> returns a positive value
if runtime journal files (present in /run/systemd/journal/) have been found.
Otherwise returns 0.</para>
<para > <function > sd_journal_has_persistent_files()</function> returns a positive value
if persistent journal files (present in /var/log/journal/) have been found.
Otherwise returns 0.</para>
</refsect1>
<refsect1 >
<title > Return value</title>
<para > Both <function > sd_journal_has_runtime_files()</function>
and <function > sd_journal_has_persistent_files()</function> return -EINVAL
if their argument is NULL.
</para>
</refsect1>
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<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>
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<xi:include href= "libsystemd-pkgconfig.xml" xpointer= "pkgconfig-text" />
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</refsect1>
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<refsect1 >
<title > See Also</title>
<para >
<citerefentry > <refentrytitle > sd-journal</refentrytitle> <manvolnum > 3</manvolnum> </citerefentry>
</para>
</refsect1>
</refentry>