sd_journal_get_data.xml revision 494a66821815e8109afa136bd42818b85da38c09
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek<?xml version='1.0'?> <!--*-nxml-*-->
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
12b42c76672a66c2d4ea7212c14f8f1b5a62b78dTom Gundersen "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek This file is part of systemd.
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek Copyright 2012 Lennart Poettering
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek systemd is free software; you can redistribute it and/or modify it
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek under the terms of the GNU Lesser General Public License as published by
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek the Free Software Foundation; either version 2.1 of the License, or
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek (at your option) any later version.
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek systemd is distributed in the hope that it will be useful, but
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek WITHOUT ANY WARRANTY; without even the implied warranty of
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek Lesser General Public License for more details.
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek You should have received a copy of the GNU Lesser General Public License
19887cd06a3af2f045e763986eda19e208bd3f85Zbigniew Jędrzejewski-Szmek along with systemd; If not, see <http://www.gnu.org/licenses/>.
21ac6ff143cc8bebfbd1818af28e8c6f82cd5265Zbigniew Jędrzejewski-Szmek<refentry id="sd_journal_get_data">
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <title>sd_journal_get_data</title>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <productname>systemd</productname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <email>lennart@poettering.net</email>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refentrytitle>sd_journal_get_data</refentrytitle>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>sd_journal_get_data</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>sd_journal_enumerate_data</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>sd_journal_restart_data</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>SD_JOURNAL_FOREACH_DATA</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>sd_journal_set_data_threshold</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refname>sd_journal_get_data_threshold</refname>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refpurpose>Read data fields from the current journal entry</refpurpose>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <refsynopsisdiv>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef>int <function>sd_journal_get_data</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>const char* <parameter>field</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>const void** <parameter>data</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>size_t* <parameter>length</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef>int <function>sd_journal_enumerate_data</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>const void** <parameter>data</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>size_t* <parameter>length</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef>void <function>sd_journal_restart_data</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef><function>SD_JOURNAL_FOREACH_DATA</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>const void* <parameter>data</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>size_t <parameter>length</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef>int <function>sd_journal_set_data_threshold</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>size_t <parameter>sz</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <funcdef>int <function>sd_journal_get_data_threshold</function></funcdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>sd_journal* <parameter>j</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <paramdef>size_t* <parameter>sz</parameter></paramdef>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </funcprototype>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek </refsynopsisdiv>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_get_data()</function> gets
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek the data object associated with a specific field from
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek the current journal entry. It takes four arguments:
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek the journal context object, a string with the field
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek name to request, plus a pair of pointers to
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek pointer/size variables where the data object and its
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek size shall be stored in. The field name should be an
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek entry field name. Well-known field names are listed in
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>. The
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returned data is in a read-only memory map and is only
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek valid until the next invocation of
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_get_data()</function> or
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_data()</function>, or
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek the read pointer is altered. Note that the data
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returned will be prefixed with the field name and
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek '='. Also note that by default data fields larger than
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek 64K might get truncated to 64K. This threshold may be
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek changed and turned off with
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_set_data_threshold()</function> (see
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_enumerate_data()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek may be used to iterate through all fields of the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek current entry. On each invocation the data for the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek next field is returned. The order of these fields is
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek not defined. The data returned is in the same format
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek as with <function>sd_journal_get_data()</function> and
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek also follows the same life-time semantics.</para>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_restart_data()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek resets the data enumeration index to the beginning of
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek the entry. The next invocation of
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_data()</function> will return the first
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek field of the entry again.</para>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para>Note that the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>SD_JOURNAL_FOREACH_DATA()</function> macro
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek may be used as a handy wrapper around
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_restart_data()</function> and
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_data()</function>.</para>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para>Note that these functions will not work before
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek (or related call) has been called at least
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek once, in order to position the read pointer at a valid entry.</para>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_set_data_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek may be used to change the data field size threshold
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek for data returned by
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_get_data()</function>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_data()</function> and
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_unique()</function>. This
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek threshold is a hint only: it indicates that the client
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek program is interested only in the initial parts of the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek data fields, up to the threshold in size -- but the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek library might still return larger data objects. That
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek means applications should not rely exclusively on this
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek setting to limit the size of the data fields returned,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek but need to apply a explicit size limit on the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returned data as well. This threshold defaults to 64K
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek by default. To retrieve the complete data fields this
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek threshold should be turned off by setting it to 0, so
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek that the library always returns the complete data
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek objects. It is recommended to set this threshold as
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek low as possible since this relieves the library from
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek having to decompress large compressed data objects in
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_get_data_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returns the currently configured data field size
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek threshold.</para>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para><function>sd_journal_get_data()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returns 0 on success or a negative errno-style error
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek code. If the current entry does not include the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek specified field, -ENOENT is returned. If
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek has not been called at least once, -EADDRNOTAVAIL is
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returned. <function>sd_journal_enumerate_data()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek returns a positive integer if the next field has been
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek read, 0 when no more fields are known, or a negative
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek errno-style error
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek code. <function>sd_journal_restart_data()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek nothing. <function>sd_journal_set_data_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek and <function>sd_journal_get_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek return 0 on success or a negative errno-style error
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <para>The <function>sd_journal_get_data()</function>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_enumerate_data()</function>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_restart_data()</function>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_set_data_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <function>sd_journal_get_data_threshold()</function>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek interfaces are available as a shared library, which can
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek be compiled and linked to with the
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <constant>libsystemd-journal</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering for a complete example how to use
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering <function>sd_journal_get_data()</function>.</para>
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering <function>SD_JOURNAL_FOREACH_DATA</function> macro to
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering iterate through all fields of the current journal
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering <programlisting>...
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poetteringint print_fields(sd_journal *j) {
6e9efa59209d48fc69a456fbadb2b5c113f503a6Lennart Poettering const void *data;
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek SD_JOURNAL_FOREACH_DATA(j, data, length)
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek printf("%.*s\n", (int) length, data);
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek...</programlisting>
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
798d3a524ea57aaf40cb53858aaa45ec702f012dZbigniew Jędrzejewski-Szmek <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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