1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>DB_ENV->get_shm_key()</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> 10 <link rel="up" href="env.html" title="Chapter��5.�� The DB_ENV Handle" /> 11 <link rel="prev" href="envget_open_flags.html" title="DB_ENV->get_open_flags()" /> 12 <link rel="next" href="envget_thread_count.html" title="DB_ENV->get_thread_count()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB_ENV->get_shm_key()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="envget_open_flags.html">Prev</a>��</td> 22 <th width="60%" align="center">Chapter��5.�� 23 The DB_ENV Handle 24 </th> 25 <td width="20%" align="right">��<a accesskey="n" href="envget_thread_count.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="envget_shm_key"></a>DB_ENV->get_shm_key()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->get_shm_key(DB_ENV *dbenv, long *shm_keyp); </pre> 42 <p> 43 The <code class="methodname">DB_ENV->get_shm_key()</code> method returns the base segment ID. This is used for Berkeley DB environment 44 shared memory regions created in system memory on VxWorks or systems supporting X/Open-style shared memory 45 interfaces. It may be specified using the <a class="xref" href="envset_shm_key.html" title="DB_ENV->set_shm_key()">DB_ENV->set_shm_key()</a> 46 method. 47 </p> 48 <p> 49 The <code class="methodname">DB_ENV->get_shm_key()</code> method may be called at any time during the 50 life of the application. 51 </p> 52 <p> 53 The <code class="methodname">DB_ENV->get_shm_key()</code> <span> 54 <span> 55 method returns a non-zero error value on failure and 0 on success. 56 </span> 57 58 </span> 59 </p> 60 <div class="sect2" lang="en" xml:lang="en"> 61 <div class="titlepage"> 62 <div> 63 <div> 64 <h3 class="title"><a id="id1663761"></a>Parameters</h3> 65 </div> 66 </div> 67 </div> 68 <div class="sect3" lang="en" xml:lang="en"> 69 <div class="titlepage"> 70 <div> 71 <div> 72 <h4 class="title"><a id="id1663878"></a>shm_keyp</h4> 73 </div> 74 </div> 75 </div> 76 <p> 77 The <code class="methodname">DB_ENV->get_shm_key()</code> method returns the base segment ID in 78 <span class="bold"><strong>shm_keyp</strong></span>. 79 </p> 80 </div> 81 </div> 82 <div class="sect2" lang="en" xml:lang="en"> 83 <div class="titlepage"> 84 <div> 85 <div> 86 <h3 class="title"><a id="id1663630"></a>Class</h3> 87 </div> 88 </div> 89 </div> 90 <p> 91 <a class="link" href="env.html" title="Chapter��5.�� The DB_ENV Handle">DB_ENV</a> 92 </p> 93 </div> 94 <div class="sect2" lang="en" xml:lang="en"> 95 <div class="titlepage"> 96 <div> 97 <div> 98 <h3 class="title"><a id="id1663638"></a>See Also</h3> 99 </div> 100 </div> 101 </div> 102 <p> 103 <a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>, 104 <a class="xref" href="envset_shm_key.html" title="DB_ENV->set_shm_key()">DB_ENV->set_shm_key()</a> 105 106 </p> 107 </div> 108 </div> 109 <div class="navfooter"> 110 <hr /> 111 <table width="100%" summary="Navigation footer"> 112 <tr> 113 <td width="40%" align="left"><a accesskey="p" href="envget_open_flags.html">Prev</a>��</td> 114 <td width="20%" align="center"> 115 <a accesskey="u" href="env.html">Up</a> 116 </td> 117 <td width="40%" align="right">��<a accesskey="n" href="envget_thread_count.html">Next</a></td> 118 </tr> 119 <tr> 120 <td width="40%" align="left" valign="top">DB_ENV->get_open_flags()��</td> 121 <td width="20%" align="center"> 122 <a accesskey="h" href="index.html">Home</a> 123 </td> 124 <td width="40%" align="right" valign="top">��DB_ENV->get_thread_count()</td> 125 </tr> 126 </table> 127 </div> 128 </body> 129</html> 130