stream-socket-pair.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.stream-socket-pair" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stream_socket_pair</refname>
  <refpurpose>
   创建一对完全一样的网络套接字连接流
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>stream_socket_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>
  </methodsynopsis>
  <para>
   <function>stream_socket_pair</function> 创建一对完全一样的网络套接字连接，这个函数通常会被用在进程间通信（Inter-Process Communication）。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>domain</parameter></term>
     <listitem>
      <para>
       使用的协议族： <constant>STREAM_PF_INET</constant>,
       <constant>STREAM_PF_INET6</constant> or
       <constant>STREAM_PF_UNIX</constant>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>type</parameter></term>
     <listitem>
      <para>
       通信类型:
       <constant>STREAM_SOCK_DGRAM</constant>、
       <constant>STREAM_SOCK_RAW</constant>、
       <constant>STREAM_SOCK_RDM</constant>、
       <constant>STREAM_SOCK_SEQPACKET</constant>、
       <constant>STREAM_SOCK_STREAM</constant>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>protocol</parameter></term>
     <listitem>
      <para>
       使用的传输协议: <constant>STREAM_IPPROTO_ICMP</constant>、
       <constant>STREAM_IPPROTO_IP</constant>、
       <constant>STREAM_IPPROTO_RAW</constant>、
       <constant>STREAM_IPPROTO_TCP</constant>、
       <constant>STREAM_IPPROTO_UDP</constant>       
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
  <note>
   <simpara>
    关于每个常量的更多细节，请查阅 <link linkend="stream.constants">Stream 常量列表</link>。
   </simpara>
  </note>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   成功时将返回一个包含了两个 socket 资源的 <type>array</type>，错误时返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>stream_socket_pair</function> 例子</title>
    <para>
     这个例子展示了
     <function>stream_socket_pair</function> 进程间通信的基本用法。
    </para>
    <programlisting role="php">
<![CDATA[
<?php

$sockets = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
$pid     = pcntl_fork();

if ($pid == -1) {
     die('could not fork');

} else if ($pid) {
    /* 父进程 */
    fclose($sockets[0]);

    fwrite($sockets[1], "child PID: $pid\n");
    echo fgets($sockets[1]);

    fclose($sockets[1]);

} else {
    /* 子进程 */
    fclose($sockets[1]);

    fwrite($sockets[0], "message from child\n");
    echo fgets($sockets[0]);

    fclose($sockets[0]);
}

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
child PID: 1378
message from child
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>
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