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<refentry xml:id="function.eio-open" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>eio_open</refname>
  <refpurpose>Opens a file</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>eio_open</methodname>
   <methodparam><type>string</type><parameter>path</parameter></methodparam>
   <methodparam><type>int</type><parameter>flags</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
   <methodparam><type>int</type><parameter>pri</parameter></methodparam>
   <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   <methodparam
   choice="opt"><type>mixed</type><parameter>data</parameter><initializer>NULL</initializer></methodparam>
  </methodsynopsis>
  <para>
  <function>eio_open</function> opens file specified by
  <parameter>path</parameter> in access mode <parameter>mode</parameter> with
  </para>


 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>path</parameter></term>
    <listitem>
     <para>
     Path of the file to be opened.
     <warning><simpara>
     In some SAPIs(e.g. <emphasis>PHP-FPM</emphasis>) it could fail, if you
     don't specify full path.
     </simpara></warning>
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>flags</parameter></term>
    <listitem>
    <para>One of <emphasis>EIO_O_*</emphasis> constants, or their
    combinations. <emphasis>EIO_O_*</emphasis> constants have the same
    meaning, as their corresponding <emphasis>O_*</emphasis> counterparts
    defined in <literal>fnctl.h</literal> C header file. Default is
    <constant>EIO_O_RDWR</constant>.
    </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>mode</parameter></term>
    <listitem>
    <para>One of <emphasis>EIO_S_I*</emphasis> constants, or their combination
    (via bitwise OR operator). The constants have the same meaning as their
    <emphasis>S_I*</emphasis> counterparts defined in <link
    xlink:href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_stat.h.html">sys/stat.h</link>
    C header file. Required, if a file is created. Otherwise ignored.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>pri</parameter></term>
    <listitem>
    &eio.request.pri.values;
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>callback</parameter></term>
    <listitem>
     &eio.callback.proto;
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>data</parameter></term>
    <listitem>
     <para>
      Arbitrary variable passed to <parameter>callback</parameter>.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   <function>eio_open</function> returns file descriptor in
   <parameter>result</parameter> argument of <parameter>callback</parameter>
   on success; otherwise, <parameter>result</parameter> is equal to <constant>-1</constant>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>eio_open</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
$temp_filename = "eio-temp-file.tmp";

/* Is called when eio_close() finishes */
function my_close_cb($data, $result) {
 // Zero indicates success
    var_dump($result == 0);
 @unlink($data);
}

/* Is called when eio_open() finishes */
function my_file_opened_callback($data, $result) {
 // $result should contain the file descriptor
    var_dump($result > 0);

    if ($result > 0) {
  // Close the file
        eio_close($result, EIO_PRI_DEFAULT, "my_close_cb", $data);
        eio_event_loop();
    }
}

// Create new file for reading and writing
// Deny group and others to do anything with that file
eio_open($temp_filename, EIO_O_CREAT | EIO_O_RDWR, EIO_S_IRUSR | EIO_S_IWUSR,
  EIO_PRI_DEFAULT, "my_file_opened_callback", $temp_filename);
eio_event_loop();
?>
]]>
   </programlisting>
   &example.outputs.similar;
   <screen>
<![CDATA[
bool(true)
bool(true)
]]>
   </screen>
  </example>
 </refsect1>


 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>eio_mknod</function></member>
  </simplelist>
 </refsect1>

</refentry>

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