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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.19 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.socket-create-pair">
<refnamediv>
<refname>socket_create_pair</refname>
<refpurpose>Creates a pair of indistinguishable sockets and stores them in an array</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>socket_create_pair</methodname>
<methodparam><type>int</type><parameter>domain</parameter></methodparam>
<methodparam><type>int</type><parameter>type</parameter></methodparam>
<methodparam><type>int</type><parameter>protocol</parameter></methodparam>
<methodparam><type>array</type><parameter role="reference">fd</parameter></methodparam>
</methodsynopsis>
<para>
<function>socket_create_pair</function> creates two connected and
indistinguishable sockets, and stores them in <parameter>fd</parameter>.
This function is commonly used in IPC (InterProcess Communication).
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>domain</parameter></term>
<listitem>
<para>
The <parameter>domain</parameter> parameter specifies the protocol
family to be used by the socket. See <function>socket_create</function>
for the full list.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>type</parameter></term>
<listitem>
<para>
The <parameter>type</parameter> parameter selects the type of communication
to be used by the socket. See <function>socket_create</function> for the
full list.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>protocol</parameter></term>
<listitem>
<para>
The <parameter>protocol</parameter> parameter sets the specific
protocol within the specified <parameter>domain</parameter> to be used
when communicating on the returned socket. The proper value can be retrieved by
name by using <function>getprotobyname</function>. If
the desired protocol is TCP, or UDP the corresponding constants
<constant>SOL_TCP</constant>, and <constant>SOL_UDP</constant>
can also be used.
</para>
<para>
See <function>socket_create</function> for the full list of supported
protocols.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>fd</parameter></term>
<listitem>
<para>
Reference to an array in which the two socket resources will be inserted.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>socket_create_pair</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$sockets = array();
/* Setup socket pair */
if (socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $sockets) === false) {
echo "socket_create_pair failed. Reason: ".socket_strerror(socket_last_error());
}
/* Send and Recieve Data */
if (socket_write($sockets[0], "ABCdef123\n", strlen("ABCdef123\n")) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($sockets[0]));
}
if (($data = socket_read($sockets[1], strlen("ABCdef123\n"), PHP_BINARY_READ) === false) {
echo "socket_read() failed. Reason: ".socket_strerror(socket_last_error($sockets[1]));
}
var_dump($data);
/* Close sockets */
socket_close($sockets[0]);
socket_close($sockets[1]);
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title><function>socket_create_pair</function> IPC example</title>
<programlisting role="php">
<![CDATA[
<?php
$ary = array();
$strone = 'Message From Parent.';
$strtwo = 'Message From Child.';
if (socket_create_pair(AF_UNIX, SOCK_STREAM, 0, $ary) === false) {
echo "socket_create_pair() failed. Reason: ".socket_strerror(socket_last_error());
}
$pid = pcntl_fork();
if ($pid == -1) {
echo 'Could not fork Process.';
} elseif ($pid) {
/*parent*/
socket_close($ary[0]);
if (socket_write($ary[1], $strone, strlen($strone)) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[1]));
}
if (socket_read($ary[1], strlen($strtwo), PHP_BINARY_READ) == $strtwo) {
echo "Recieved $strtwo\n";
}
socket_close($ary[1]);
} else {
/*child*/
socket_close($ary[1]);
if (socket_write($ary[0], $strtwo, strlen($strtwo)) === false) {
echo "socket_write() failed. Reason: ".socket_strerror(socket_last_error($ary[0]));
}
if (socket_read($ary[0], strlen($strone), PHP_BINARY_READ) == $strone) {
echo "Recieved $strone\n";
}
socket_close($ary[0]);
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>socket_create</function></member>
<member><function>socket_create_listen</function></member>
<member><function>socket_bind</function></member>
<member><function>socket_listen</function></member>
<member><function>socket_last_error</function></member>
<member><function>socket_strerror</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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-->
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