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<refentry xml:id="function.posix-getpgid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>posix_getpgid</refname>
  <refpurpose>Get process group id for job control</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>false</type></type><methodname>posix_getpgid</methodname>
   <methodparam><type>int</type><parameter>process_id</parameter></methodparam>
  </methodsynopsis>
  <para>
   Returns the process group identifier of the process
   <parameter>process_id</parameter>&return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>process_id</parameter></term>
     <listitem>
      <para>
       The process id.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the identifier, as an <type>int</type>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Example use of <function>posix_getpgid</function></title>
    <programlisting role="php">
<![CDATA[
<?php
$pid = posix_getppid();
echo posix_getpgid($pid); //35
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    This is a not POSIX function, but is common on BSD and System V
    systems. If the system does not support this function, then it
    will not be included at compile time.  This may be checked with
    <function>function_exists</function>.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>posix_getppid</function></member>
    <member>man page SETPGID(2)</member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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