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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.eio-read" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>eio_read</refname>
<refpurpose>Read from a file descriptor at given offset</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>resource</type><methodname>eio_read</methodname>
<methodparam><type>mixed</type><parameter>fd</parameter></methodparam>
<methodparam><type>int</type><parameter>length</parameter></methodparam>
<methodparam><type>int</type><parameter>offset</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_read</function> reads up to <parameter>length</parameter>
bytes from <parameter>fd</parameter> file descriptor at
<parameter>offset</parameter>. The read bytes are stored in
<parameter>result</parameter> argument of <parameter>callback</parameter>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>fd</parameter></term>
<listitem>
<para>
Stream, Socket resource, or numeric file descriptor
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
Maximum number of bytes to read.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>offset</parameter></term>
<listitem>
<para>
Offset within the file.
</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_read</function> stores read bytes in
<parameter>result</parameter> argument of <parameter>callback</parameter>
function.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>eio_read</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Open a temporary file and write some bytes there
$temp_filename = "eio-temp-file.tmp";
$fp = fopen($temp_filename, "w");
fwrite($fp, "1234567890");
fclose($fp);
/* Is called when eio_read() is done */
function my_read_cb($data, $result) {
global $temp_filename;
// Output read bytes
var_dump($result);
// Close file
eio_close($data);
eio_event_loop();
// Remove temporary file
@unlink($temp_filename);
}
/* Is called when eio_open() is done */
function my_file_opened_callback($data, $result) {
// $result should contain the file descriptor
if ($result > 0) {
// Read 5 bytes starting from third
eio_read($result, 5, 2, EIO_PRI_DEFAULT, "my_read_cb", $result);
eio_event_loop();
} else {
// eio_open() failed
unlink($data);
}
}
// Open the file for reading and writing
eio_open($temp_filename, EIO_O_RDWR, NULL,
EIO_PRI_DEFAULT, "my_file_opened_callback", $temp_filename);
eio_event_loop();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
string(5) "34567"
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><function>eio_open</function></member>
<member><function>eio_write</function></member>
<member><function>eio_close</function></member>
<member><function>eio_event_loop</function></member>
</simplelist>
</refsect1>
</refentry>
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