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  <refentry id="function.msg-stat-queue">
   <refnamediv>
    <refname>msg_stat_queue</refname>
    <refpurpose>
     Returns information from the message queue data structure
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>array</type><methodname>msg_stat_queue</methodname>
     <methodparam><type>int</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>
    <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>msg_perm.uid</entry> 
         <entry>
          The uid of the owner of the queue.
         </entry>
        </row>
        <row>
         <entry>msg_perm.gid</entry> 
         <entry>
          The gid of the owner of the queue.
         </entry>
        </row>
        <row>
         <entry>msg_perm.mode</entry> 
         <entry>
          The file access mode of the queue.
         </entry>
        </row>
        <row>
         <entry>msg_stime</entry> 
         <entry>
          The time that the last message was sent to the queue.
         </entry>
        </row>
        <row>
         <entry>msg_rtime</entry> 
         <entry>
          The time that the last message was received from the queue.
         </entry>
        </row>
        <row>
         <entry>msg_ctime</entry> 
         <entry>
          The time that the queue was last changed.
         </entry>
        </row>
        <row>
         <entry>msg_qnum</entry> 
         <entry>
          The number of messages waiting to be read from the queue.
         </entry>
        </row>
        <row>
         <entry>msg_qbytes</entry> 
         <entry>
          The number of bytes of space currently available in the queue to
          hold sent messages until they are received.
         </entry>
        </row>
        <row>
         <entry>msg_lspid</entry> 
         <entry>
          The pid of the process that sent the last message to the queue.
         </entry>
        </row>
        <row>
         <entry>msg_lrpid</entry> 
         <entry>
          The pid of the process that received the last message from the queue.
         </entry>
        </row>
       </tbody>
      </tgroup>
     </table>
    </para>
    <para>
     See also: <function>msg_remove_queue</function>,
     <function>msg_receive</function>,
     <function>msg_stat_queue</function> and
     <function>msg_set_queue</function>.
    </para>
   </refsect1>
  </refentry>

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