"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
+ SPDX-License-Identifier: LGPL-2.1+
+
This file is part of systemd.
Copyright 2012 Lennart Poettering
<refnamediv>
<refname>sd_journal_open</refname>
<refname>sd_journal_open_directory</refname>
+ <refname>sd_journal_open_directory_fd</refname>
<refname>sd_journal_open_files</refname>
- <refname>sd_journal_open_container</refname>
+ <refname>sd_journal_open_files_fd</refname>
<refname>sd_journal_close</refname>
<refname>sd_journal</refname>
<refname>SD_JOURNAL_LOCAL_ONLY</refname>
<refname>SD_JOURNAL_RUNTIME_ONLY</refname>
<refname>SD_JOURNAL_SYSTEM</refname>
<refname>SD_JOURNAL_CURRENT_USER</refname>
+ <refname>SD_JOURNAL_OS_ROOT</refname>
<refpurpose>Open the system journal for reading</refpurpose>
</refnamediv>
<paramdef>int <parameter>flags</parameter></paramdef>
</funcprototype>
+ <funcprototype>
+ <funcdef>int <function>sd_journal_open_directory_fd</function></funcdef>
+ <paramdef>sd_journal **<parameter>ret</parameter></paramdef>
+ <paramdef>int <parameter>fd</parameter></paramdef>
+ <paramdef>int <parameter>flags</parameter></paramdef>
+ </funcprototype>
+
<funcprototype>
<funcdef>int <function>sd_journal_open_files</function></funcdef>
<paramdef>sd_journal **<parameter>ret</parameter></paramdef>
</funcprototype>
<funcprototype>
- <funcdef>int <function>sd_journal_open_container</function></funcdef>
+ <funcdef>int <function>sd_journal_open_files_fd</function></funcdef>
<paramdef>sd_journal **<parameter>ret</parameter></paramdef>
- <paramdef>const char *<parameter>machine</parameter></paramdef>
+ <paramdef>int <parameter>fds[]</parameter></paramdef>
+ <paramdef>unsigned <parameter>n_fds</parameter></paramdef>
<paramdef>int <parameter>flags</parameter></paramdef>
</funcprototype>
<constant>SD_JOURNAL_CURRENT_USER</constant> are specified, all
journal file types will be opened.</para>
- <para><function>sd_journal_open_directory()</function> is similar
- to <function>sd_journal_open()</function> but takes an absolute
- directory path as argument. All journal files in this directory
- will be opened and interleaved automatically. This call also takes
- a flags argument, but it must be passed as 0 as no flags are
- currently understood for this call.</para>
-
- <para><function>sd_journal_open_files()</function> is similar to
- <function>sd_journal_open()</function> but takes a
- <constant>NULL</constant>-terminated list of file paths to open.
- All files will be opened and interleaved automatically. This call
- also takes a flags argument, but it must be passed as 0 as no
- flags are currently understood for this call. Please note that in
- the case of a live journal, this function is only useful for
- debugging, because individual journal files can be rotated at any
- moment, and the opening of specific files is inherently
- racy.</para>
-
- <para><function>sd_journal_open_container()</function> is similar
- to <function>sd_journal_open()</function> but opens the journal
- files of a running OS container. The specified machine name refers
- to a container that is registered with
- <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+ <para><function>sd_journal_open_directory()</function> is similar to <function>sd_journal_open()</function> but
+ takes an absolute directory path as argument. All journal files in this directory will be opened and interleaved
+ automatically. This call also takes a flags argument. The flags parameters accepted by this call are
+ <constant>SD_JOURNAL_OS_ROOT</constant>, <constant>SD_JOURNAL_SYSTEM</constant>, and
+ <constant>SD_JOURNAL_CURRENT_USER</constant>. If <constant>SD_JOURNAL_OS_ROOT</constant> is specified, journal
+ files are searched for below the usual <filename>/var/log/journal</filename> and
+ <filename>/run/log/journal</filename> relative to the specified path, instead of directly beneath it.
+ The other two flags limit which files are opened, the same as for <function>sd_journal_open()</function>.
+ </para>
+
+ <para><function>sd_journal_open_directory_fd()</function> is similar to
+ <function>sd_journal_open_directory()</function>, but takes a file descriptor referencing a directory in the file
+ system instead of an absolute file system path.</para>
+
+ <para><function>sd_journal_open_files()</function> is similar to <function>sd_journal_open()</function> but takes a
+ <constant>NULL</constant>-terminated list of file paths to open. All files will be opened and interleaved
+ automatically. This call also takes a flags argument, but it must be passed as 0 as no flags are currently
+ understood for this call. Please note that in the case of a live journal, this function is only useful for
+ debugging, because individual journal files can be rotated at any moment, and the opening of specific files is
+ inherently racy.</para>
+
+ <para><function>sd_journal_open_files_fd()</function> is similar to <function>sd_journal_open_files()</function>
+ but takes an array of open file descriptors that must reference journal files, instead of an array of file system
+ paths. Pass the array of file descriptors as second argument, and the number of array entries in the third. The
+ flags parameter must be passed as 0.</para>
<para><varname>sd_journal</varname> objects cannot be used in the
child after a fork. Functions which take a journal object as an
<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_open()</function>,
<function>sd_journal_open_directory()</function> and
<function>sd_journal_close()</function> interfaces are available
file.</para>
</refsect1>
- <refsect1>
- <title>History</title>
-
- <para><function>sd_journal_open()</function>,
- <function>sd_journal_close()</function>,
- <constant>SD_JOURNAL_LOCAL_ONLY</constant>,
- <constant>SD_JOURNAL_RUNTIME_ONLY</constant>,
- <constant>SD_JOURNAL_SYSTEM_ONLY</constant> were added in
- systemd-38.</para>
-
- <para><function>sd_journal_open_directory()</function> was added
- in systemd-187.</para>
-
- <para><constant>SD_JOURNAL_SYSTEM</constant>,
- <constant>SD_JOURNAL_CURRENT_USER</constant>, and
- <function>sd_journal_open_files()</function> were added in
- systemd-205. <constant>SD_JOURNAL_SYSTEM_ONLY</constant> was
- deprecated.</para>
- </refsect1>
-
<refsect1>
<title>See Also</title>
projects / thirdparty / systemd.git / blobdiff