man/sd_journal_has_runtime_files.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1-or-later
   7 -->
   8
   9 <refentry id="sd_journal_has_runtime_files" xmlns:xi="http://www.w3.org/2001/XInclude">
  10
  11   <refentryinfo>
  12     <title>sd_journal_has_runtime_files</title>
  13     <productname>systemd</productname>
  14   </refentryinfo>
  15
  16   <refmeta>
  17     <refentrytitle>sd_journal_has_runtime_files</refentrytitle>
  18     <manvolnum>3</manvolnum>
  19   </refmeta>
  20
  21   <refnamediv>
  22     <refname>sd_journal_has_runtime_files</refname>
  23     <refname>sd_journal_has_persistent_files</refname>
  24     <refpurpose>Query availability of runtime or persistent journal files</refpurpose>
  25   </refnamediv>
  26
  27   <refsynopsisdiv>
  28     <funcsynopsis>
  29       <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
  30
  31       <funcprototype>
  32         <funcdef>int <function>sd_journal_has_runtime_files</function></funcdef>
  33         <paramdef>sd_journal *<parameter>j</parameter></paramdef>
  34       </funcprototype>
  35
  36       <funcprototype>
  37         <funcdef>int <function>sd_journal_has_persistent_files</function></funcdef>
  38         <paramdef>sd_journal *<parameter>j</parameter></paramdef>
  39       </funcprototype>
  40
  41     </funcsynopsis>
  42   </refsynopsisdiv>
  43
  44   <refsect1>
  45     <title>Description</title>
  46
  47     <para><function>sd_journal_has_runtime_files()</function> returns a positive value
  48     if runtime journal files (present in /run/systemd/journal/) have been found.
  49     Otherwise returns 0.</para>
  50
  51     <para><function>sd_journal_has_persistent_files()</function> returns a positive value
  52     if persistent journal files (present in /var/log/journal/) have been found.
  53     Otherwise returns 0.</para>
  54   </refsect1>
  55
  56   <refsect1>
  57     <title>Return value</title>
  58     <para>Both <function>sd_journal_has_runtime_files()</function>
  59     and <function>sd_journal_has_persistent_files()</function> return -EINVAL
  60     if their argument is <constant>NULL</constant>.
  61     </para>
  62   </refsect1>
  63
  64   <refsect1>
  65     <title>Notes</title>
  66
  67     <xi:include href="threads-aware.xml" xpointer="strict"/>
  68
  69     <xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
  70   </refsect1>
  71
  72   <refsect1>
  73     <title>History</title>
  74     <para><function>sd_journal_has_runtime_files()</function> and
  75     <function>sd_journal_has_persistent_files()</function> were added in version 229.</para>
  76   </refsect1>
  77
  78   <refsect1>
  79     <title>See Also</title>
  80     <para>
  81       <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  82     </para>
  83   </refsect1>
  84
  85 </refentry>