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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.msg-stat-queue">
<refnamediv>
<refname>msg_stat_queue</refname>
<refpurpose>Returns information from the message queue data structure</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>msg_stat_queue</methodname>
<methodparam><type>resource</type><parameter>queue</parameter></methodparam>
</methodsynopsis>
<para>
<function>msg_stat_queue</function> returns the message queue meta data
for the message queue specified by the <parameter>queue</parameter>.
This is useful, for example, to determine which process sent the message
that was just received.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>queue</parameter></term>
<listitem>
<para>
Message queue resource handle
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The return value is an array whose keys and values have the following
meanings:
<table>
<title>Array structure for msg_stat_queue</title>
<tgroup cols="2">
<tbody>
<row>
<entry><literal>msg_perm.uid</literal></entry>
<entry>
The uid of the owner of the queue.
</entry>
</row>
<row>
<entry><literal>msg_perm.gid</literal></entry>
<entry>
The gid of the owner of the queue.
</entry>
</row>
<row>
<entry><literal>msg_perm.mode</literal></entry>
<entry>
The file access mode of the queue.
</entry>
</row>
<row>
<entry><literal>msg_stime</literal></entry>
<entry>
The time that the last message was sent to the queue.
</entry>
</row>
<row>
<entry><literal>msg_rtime</literal></entry>
<entry>
The time that the last message was received from the queue.
</entry>
</row>
<row>
<entry><literal>msg_ctime</literal></entry>
<entry>
The time that the queue was last changed.
</entry>
</row>
<row>
<entry><literal>msg_qnum</literal></entry>
<entry>
The number of messages waiting to be read from the queue.
</entry>
</row>
<row>
<entry><literal>msg_qbytes</literal></entry>
<entry>
The maximum number of bytes allowed in one message queue. On
Linux, this value may be read and modified via
<filename>/proc/sys/kernel/msgmnb</filename>.
</entry>
</row>
<row>
<entry><literal>msg_lspid</literal></entry>
<entry>
The pid of the process that sent the last message to the queue.
</entry>
</row>
<row>
<entry><literal>msg_lrpid</literal></entry>
<entry>
The pid of the process that received the last message from the queue.
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>msg_remove_queue</function></member>
<member><function>msg_receive</function></member>
<member><function>msg_get_queue</function></member>
<member><function>msg_set_queue</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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