diff options
Diffstat (limited to 'man/sd_journal_add_match.xml')
| -rw-r--r-- | man/sd_journal_add_match.xml | 66 |
1 files changed, 49 insertions, 17 deletions
diff --git a/man/sd_journal_add_match.xml b/man/sd_journal_add_match.xml index 04b33883cb..549785ca83 100644 --- a/man/sd_journal_add_match.xml +++ b/man/sd_journal_add_match.xml @@ -45,6 +45,7 @@ <refnamediv> <refname>sd_journal_add_match</refname> <refname>sd_journal_add_disjunction</refname> + <refname>sd_journal_add_conjunction</refname> <refname>sd_journal_flush_matches</refname> <refpurpose>Add or remove entry matches</refpurpose> </refnamediv> @@ -66,6 +67,11 @@ </funcprototype> <funcprototype> + <funcdef>int <function>sd_journal_add_conjunction</function></funcdef> + <paramdef>sd_journal* <parameter>j</parameter></paramdef> + </funcprototype> + + <funcprototype> <funcdef>void <function>sd_journal_flush_matches</function></funcdef> <paramdef>sd_journal* <parameter>j</parameter></paramdef> </funcprototype> @@ -105,21 +111,45 @@ <para><function>sd_journal_add_disjunction()</function> may be used to insert a disjunction (i.e. logical OR) in the match list. If this call is invoked all - previously added matches are combined in an OR with - all matches added afterwards, until - <function>sd_journal_add_disjunction()</function> is - invoked again to begin the next OR term. The + previously added matches since the last invocation of + <function>sd_journal_add_disjunction()</function> or + <function>sd_journal_add_conjunction()</function> are + combined in an OR with all matches added afterwards, + until + <function>sd_journal_add_disjunction()</function> or + <function>sd_journal_add_conjunction()</function> is + invoked again to begin the next OR or AND + term. </para> + + <para><function>sd_journal_add_conjunction()</function> + may be used to insert a conjunction (i.e. logical AND) + in the match list. If this call is invoked all + previously added matches since the last invocation of + <function>sd_journal_add_conjunction()</function> are + combined in an AND with all matches added afterwards, + until + <function>sd_journal_add_conjunction()</function> is + invoked again to begin the next AND term. The combination of - <function>sd_journal_add_match()</function> and - <function>sd_journal_add_disjunction()</function> may + <function>sd_journal_add_match()</function>, + <function>sd_journal_add_disjunction()</function> and + <function>sd_journal_add_conjunction()</function> may be used to build complex search terms, even though - full logical expressions are not available.</para> + full logical expressions are not available. Note that + <function>sd_journal_add_conjunction()</function> + operates one level 'higher' than + <function>sd_journal_add_disjunction()</function>. It + is hence possible to build an expression of AND terms, + consisting of OR terms, consisting of AND terms, + consisting of OR terms of matches (the latter OR + expression is implicitly created for matches with the + same field name, see above).</para> <para><function>sd_journal_flush_matches()</function> - may be used to flush all matches and disjunction terms - again. After this call all filtering is removed and - all entries in the journal will be iterated - again.</para> + may be used to flush all matches, disjunction and + conjunction terms again. After this call all filtering + is removed and all entries in the journal will be + iterated again.</para> <para>Note that filtering via matches only applies to the way the journal is read, it has no effect on storage @@ -129,8 +159,9 @@ <refsect1> <title>Return Value</title> - <para><function>sd_journal_add_match()</function> and - <function>sd_journal_add_disjunction()</function> + <para><function>sd_journal_add_match()</function>, + <function>sd_journal_add_disjunction()</function> and + <function>sd_journal_add_conjunction()</function> return 0 on success or a negative errno-style error code. <function>sd_journal_flush_matches()</function> returns nothing.</para> @@ -140,10 +171,11 @@ <title>Notes</title> <para>The <function>sd_journal_add_match()</function>, - <function>sd_journal_add_disjunction()</function> and - <function>sd_journal_flush_matches()</function> interfaces are - available as shared library, which can be compiled and - linked to with the + <function>sd_journal_add_disjunction()</function>, + <function>sd_journal_add_conjunction()</function> and + <function>sd_journal_flush_matches()</function> + interfaces are available as shared library, which can + be compiled and linked to with the <literal>libsystemd-journal</literal> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> file.</para> |