diff options
Diffstat (limited to 'man/sd_journal_open.xml')
| -rw-r--r-- | man/sd_journal_open.xml | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/man/sd_journal_open.xml b/man/sd_journal_open.xml deleted file mode 100644 index 25b3048f2e..0000000000 --- a/man/sd_journal_open.xml +++ /dev/null @@ -1,234 +0,0 @@ -<?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_open"> - - <refentryinfo> - <title>sd_journal_open</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_open</refentrytitle> - <manvolnum>3</manvolnum> - </refmeta> - - <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_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> - - <refsynopsisdiv> - <funcsynopsis> - <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> - - <funcprototype> - <funcdef>int <function>sd_journal_open</function></funcdef> - <paramdef>sd_journal **<parameter>ret</parameter></paramdef> - <paramdef>int <parameter>flags</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_open_directory</function></funcdef> - <paramdef>sd_journal **<parameter>ret</parameter></paramdef> - <paramdef>const char *<parameter>path</parameter></paramdef> - <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> - <paramdef>const char **<parameter>paths</parameter></paramdef> - <paramdef>int <parameter>flags</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_open_files_fd</function></funcdef> - <paramdef>sd_journal **<parameter>ret</parameter></paramdef> - <paramdef>int <parameter>fds[]</parameter></paramdef> - <paramdef>unsigned <parameter>n_fds</parameter></paramdef> - <paramdef>int <parameter>flags</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>void <function>sd_journal_close</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - </funcprototype> - </funcsynopsis> - </refsynopsisdiv> - - <refsect1> - <title>Description</title> - - <para><function>sd_journal_open()</function> opens the log journal - for reading. It will find all journal files automatically and - interleave them automatically when reading. As first argument it - takes a pointer to a <varname>sd_journal</varname> pointer, which, - on success, will contain a journal context object. The second - argument is a flags field, which may consist of the following - flags ORed together: <constant>SD_JOURNAL_LOCAL_ONLY</constant> - makes sure only journal files generated on the local machine will - be opened. <constant>SD_JOURNAL_RUNTIME_ONLY</constant> makes sure - only volatile journal files will be opened, excluding those which - are stored on persistent storage. - <constant>SD_JOURNAL_SYSTEM</constant> will cause journal files of - system services and the kernel (in opposition to user session - processes) to be opened. - <constant>SD_JOURNAL_CURRENT_USER</constant> will cause journal - files of the current user to be opened. If neither - <constant>SD_JOURNAL_SYSTEM</constant> nor - <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. 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 - argument (<function>sd_journal_next()</function> and others) will - return <constant>-ECHILD</constant> after a fork. - </para> - - <para><function>sd_journal_close()</function> will close the - journal context allocated with - <function>sd_journal_open()</function> or - <function>sd_journal_open_directory()</function> and free its - resources.</para> - - <para>When opening the journal only journal files accessible to - the calling user will be opened. If journal files are not - accessible to the caller, this will be silently ignored.</para> - - <para>See - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> - for an example of how to iterate through the journal after opening - it with <function>sd_journal_open()</function>.</para> - - <para>A journal context object returned by - <function>sd_journal_open()</function> references a specific - journal entry as <emphasis>current</emphasis> entry, similar to a - file seek index in a classic file system file, but without - absolute positions. It may be altered with - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> - and - <citerefentry><refentrytitle>sd_journal_seek_head</refentrytitle><manvolnum>3</manvolnum></citerefentry> - and related calls. The current entry position may be exported in - <emphasis>cursor</emphasis> strings, as accessible via - <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. - Cursor strings may be used to globally identify a specific journal - entry in a stable way and then later to seek to it (or if the - specific entry is not available locally, to its closest entry in - time) - <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> - - <para>Notification of journal changes is available via - <function>sd_journal_get_fd()</function> and related calls.</para> - </refsect1> - - <refsect1> - <title>Return Value</title> - - <para>The <function>sd_journal_open()</function>, - <function>sd_journal_open_directory()</function>, and - <function>sd_journal_open_files()</function> calls return 0 on - success or a negative errno-style error code. - <function>sd_journal_close()</function> returns nothing.</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_open()</function>, - <function>sd_journal_open_directory()</function> and - <function>sd_journal_close()</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_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry> - </para> - </refsect1> - -</refentry> |