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<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="function.pcntl-rfork" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pcntl_rfork</refname>
<refpurpose>Manipulates process resources</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>pcntl_rfork</methodname>
<methodparam><type>int</type><parameter>flags</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>signal</parameter><initializer>0</initializer></methodparam>
</methodsynopsis>
<para>
Manipulates process resources.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>flags</parameter></term>
<listitem>
<para>
The <parameter>flags</parameter> parameter determines which resources of the invoking process (parent)
are shared by the new process (child) or initialized to their default values.
</para>
<para>
<parameter>flags</parameter> is the logical OR of some subset of:
<simplelist>
<member>
<constant>RFPROC</constant>: If set a new process is created;
otherwise changes affect the current process.
</member>
<member>
<constant>RFNOWAIT</constant>: If set, the child process will be dissociated from the parent.
Upon exit the child will not leave a status for the parent to collect.
</member>
<member>
<constant>RFFDG</constant>: If set, the invoker's file descriptor table is copied;
otherwise the two processes share a single table.
</member>
<member>
<constant>RFCFDG</constant>: If set, the new process starts with a clean file descriptor table.
Is mutually exclusive with <constant>RFFDG</constant>.
</member>
<member>
<constant>RFLINUXTHPN</constant>: If set, the kernel will return SIGUSR1 instead of SIGCHILD upon thread exit for the child.
This is intended to do Linux clone exit parent notification.
</member>
</simplelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>signal</parameter></term>
<listitem>
<para>
The signal number.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
On success, the PID of the child process is returned in the
parent's thread of execution, and a <literal>0</literal> is returned in the child's
thread of execution.
On failure, a <literal>-1</literal> will be returned in the
parent's context, no child process will be created, and a PHP error is raised.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pcntl_rfork</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$pid = pcntl_rfork(RFNOWAIT|RFTSIGZMB, SIGUSR1);
if ($pid > 0) {
// This is the parent process.
var_dump($pid);
} else {
// This is the child process.
var_dump($pid);
sleep(2); // as the child does not wait, so we see its "pid"
}
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
int(77093)
int(0)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<note>
<para>
This function is only available on BSD systems.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pcntl_fork</function></member>
<member><function>pcntl_waitpid</function></member>
<member><function>pcntl_signal</function></member>
<member><function>cli_set_process_title</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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