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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.openlog" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>openlog</refname>
<refpurpose>Open connection to system logger</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>true</type><methodname>openlog</methodname>
<methodparam><type>string</type><parameter>prefix</parameter></methodparam>
<methodparam><type>int</type><parameter>flags</parameter></methodparam>
<methodparam><type>int</type><parameter>facility</parameter></methodparam>
</methodsynopsis>
<para>
<function>openlog</function> opens a connection to the system
logger for a program.
</para>
<para>
The use of <function>openlog</function> is optional. It
will automatically be called by <function>syslog</function> if
necessary, in which case <parameter>prefix</parameter> will default
to the empty string.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>prefix</parameter></term>
<listitem>
<para>
The string <parameter>prefix</parameter> is added to each message.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>
Bitmask of the following constants:
<simplelist>
<member><constant>LOG_CONS</constant></member>
<member><constant>LOG_NDELAY</constant></member>
<member><constant>LOG_ODELAY</constant></member>
<member><constant>LOG_NOWAIT</constant></member>
<member><constant>LOG_PERROR</constant></member>
<member><constant>LOG_PID</constant></member>
</simplelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>facility</parameter></term>
<listitem>
<para>
The <parameter>facility</parameter> argument is used to specify
what type of program is logging the message.
This lets the configuration file specify that messages from different
facilities will be handled differently.
Must be one of the following constants:
<simplelist>
<member><constant>LOG_AUTH</constant></member>
<member><constant>LOG_AUTHPRIV</constant></member>
<member><constant>LOG_CRON</constant></member>
<member><constant>LOG_DAEMON</constant></member>
<member><constant>LOG_KERN</constant></member>
<member><constant>LOG_LOCAL<replaceable>[0-7]</replaceable></constant></member>
<member><constant>LOG_LPR</constant></member>
<member><constant>LOG_MAIL</constant></member>
<member><constant>LOG_NEWS</constant></member>
<member><constant>LOG_SYSLOG</constant></member>
<member><constant>LOG_USER</constant></member>
<member><constant>LOG_UUCP</constant></member>
</simplelist>
</para>
<note>
<simpara>
This parameter is ignored on Windows.
</simpara>
</note>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.true.always;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.2.0</entry>
<entry>
The function now always returns &true;. Previously it returned &false; on failure.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>syslog</function></member>
<member><function>closelog</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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