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sd-journal: introduce has_runtime_files and has_persistent_files

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Also introduce sd_journal_has_runtime_files() and
sd_journal_has_persistent_files() to the public API. These functions
can be used to easily find out if the open journal files are runtime
and/or persistent.
This commit is contained in:
Jan Synacek 2016-02-01 09:23:58 +01:00
parent c25bf528a1
commit 39fd5b08a7
6 changed files with 131 additions and 2 deletions
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7
Makefile-man.am
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@ -79,6 +79,7 @@ MANPAGES += \
man/sd_journal_get_fd.3 \
man/sd_journal_get_realtime_usec.3 \
man/sd_journal_get_usage.3 \
man/sd_journal_has_runtime_files.3 \
man/sd_journal_next.3 \
man/sd_journal_open.3 \
man/sd_journal_print.3 \
@ -384,6 +385,7 @@ MANPAGES_ALIAS += \
man/sd_journal_get_events.3 \
man/sd_journal_get_monotonic_usec.3 \
man/sd_journal_get_timeout.3 \
man/sd_journal_has_persistent_files.3 \
man/sd_journal_next_skip.3 \
man/sd_journal_open_container.3 \
man/sd_journal_open_directory.3 \
@ -711,6 +713,7 @@ man/sd_journal_get_data_threshold.3: man/sd_journal_get_data.3
man/sd_journal_get_events.3: man/sd_journal_get_fd.3
man/sd_journal_get_monotonic_usec.3: man/sd_journal_get_realtime_usec.3
man/sd_journal_get_timeout.3: man/sd_journal_get_fd.3
man/sd_journal_has_persistent_files.3: man/sd_journal_has_runtime_files.3
man/sd_journal_next_skip.3: man/sd_journal_next.3
man/sd_journal_open_container.3: man/sd_journal_open.3
man/sd_journal_open_directory.3: man/sd_journal_open.3
@ -1458,6 +1461,9 @@ man/sd_journal_get_monotonic_usec.html: man/sd_journal_get_realtime_usec.html
man/sd_journal_get_timeout.html: man/sd_journal_get_fd.html
$(html-alias)
man/sd_journal_has_persistent_files.html: man/sd_journal_has_runtime_files.html
$(html-alias)
man/sd_journal_next_skip.html: man/sd_journal_next.html
$(html-alias)
@ -2535,6 +2541,7 @@ EXTRA_DIST += \
man/sd_journal_get_fd.xml \
man/sd_journal_get_realtime_usec.xml \
man/sd_journal_get_usage.xml \
man/sd_journal_has_runtime_files.xml \
man/sd_journal_next.xml \
man/sd_journal_open.xml \
man/sd_journal_print.xml \

8
man/sd-journal.xml
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@ -81,9 +81,11 @@
<citerefentry><refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_cutoff_monotonic_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_usage</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
<citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_has_runtime_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>
and
<citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>
<citerefentry><refentrytitle>sd_journal_has_persistent_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for more information about the functions implemented.</para>
<para>Command line access for submitting entries to the journal is
@ -116,6 +118,8 @@
<citerefentry><refentrytitle>sd_journal_get_fd</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_query_unique</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_catalog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_has_runtime_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_has_persistent_files</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>

95
man/sd_journal_has_runtime_files.xml Normal file
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@ -0,0 +1,95 @@
<?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 2016 Jan Synáček
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_has_runtime_files">
<refentryinfo>
<title>sd_journal_has_runtime_files</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Jan</firstname>
<surname>Synáček</surname>
<email>jan.synacek@gmail.com</email>
</author>
</authorgroup>
</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 &lt;systemd/sd-journal.h&gt;</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>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>

2
src/journal/journal-internal.h
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@ -115,6 +115,8 @@ struct sd_journal {
removed, and there were no more
files, so sd_j_enumerate_unique
will return a value equal to 0. */
bool has_runtime_files:1;
bool has_persistent_files:1;
size_t data_threshold;

18
src/journal/sd-journal.c
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@ -1292,6 +1292,12 @@ static int add_file(sd_journal *j, const char *prefix, const char *filename) {
return 0;
path = strjoina(prefix, "/", filename);
if (!j->has_runtime_files && path_startswith(path, "/run/log/journal"))
j->has_runtime_files = true;
else if (!j->has_persistent_files && path_startswith(path, "/var/log/journal"))
j->has_persistent_files = true;
return add_any_file(j, path);
}
@ -2630,3 +2636,15 @@ _public_ int sd_journal_get_data_threshold(sd_journal *j, size_t *sz) {
*sz = j->data_threshold;
return 0;
}
_public_ int sd_journal_has_runtime_files(sd_journal *j) {
assert_return(j, -EINVAL);
return j->has_runtime_files;
}
_public_ int sd_journal_has_persistent_files(sd_journal *j) {
assert_return(j, -EINVAL);
return j->has_persistent_files;
}

3
src/systemd/sd-journal.h
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@ -139,6 +139,9 @@ int sd_journal_reliable_fd(sd_journal *j);
int sd_journal_get_catalog(sd_journal *j, char **text);
int sd_journal_get_catalog_for_message_id(sd_id128_t id, char **text);
int sd_journal_has_runtime_files(sd_journal *j);
int sd_journal_has_persistent_files(sd_journal *j);
/* the inverse condition avoids ambiguity of danling 'else' after the macro */
#define SD_JOURNAL_FOREACH(j) \
if (sd_journal_seek_head(j) < 0) { } \