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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<!-- splitted from ./en/functions/sem.xml, last change in rev 1.2 -->
<refentry id="function.shm-attach">
<refnamediv>
<refname>shm_attach</refname>
<refpurpose>Creates or open a shared memory segment</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>int</type><methodname>shm_attach</methodname>
<methodparam><type>int</type><parameter>key</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>memsize</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>perm</parameter></methodparam>
</methodsynopsis>
<para>
<function>shm_attach</function> returns an id that can be
used to access the System V shared memory with the given key, the
first call creates the shared memory segment with <parameter>memsize</parameter>
(default: sysvshm.init_mem in the &php.ini;, otherwise
10000 bytes) and the optional perm-bits <parameter>perm</parameter>
(default: 0666).
</para>
<para>
A second call to <function>shm_attach</function> for the same
<parameter>key</parameter> will return a different shared memory
identifier, but both identifiers access the same underlying
shared memory. <parameter>Memsize</parameter> and
<parameter>perm</parameter> will be ignored.
</para>
<para>
See also <function>ftok</function>, and <function>shm_detach</function>.
</para>
</refsect1>
</refentry>
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