<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>DbEnv::repmgr_channel()</title> <link rel="stylesheet" href="apiReference.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB C++ API Reference" /> <link rel="up" href="rep.html" title="Chapter 11. Replication Methods" /> <link rel="prev" href="repsync.html" title="DbEnv::rep_sync()" /> <link rel="next" href="repmgr_local_site.html" title="DbEnv::repmgr_local_site()" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">DbEnv::repmgr_channel()</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="repsync.html">Prev</a> </td> <th width="60%" align="center">Chapter 11. Replication Methods </th> <td width="20%" align="right"> <a accesskey="n" href="repmgr_local_site.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="repmgr_channel"></a>DbEnv::repmgr_channel()</h2> </div> </div> </div> <pre class="programlisting">#include <db_cxx.h> int DbEnv::repmgr_channel(int eid, DB_CHANNEL **channelp, u_int32_t flags);</pre> <p> The <code class="methodname">DbEnv::repmgr_channel()</code> method returns a DbChannel handle. This is used to create and manage custom message traffic between the sites in the replication group. </p> <p> This method allocates memory for the handle, returning a pointer to the structure in the memory to which <span class="bold"><strong>channelp</strong></span> refers. To release the allocated memory and discard the handle, call the <a class="xref" href="dbchannel_close.html" title="DbChannel::close()">DbChannel::close()</a> method. </p> <p> The <code class="methodname">DbEnv::repmgr_channel()</code> method may be called at any time after <a class="xref" href="repmgrstart.html" title="DbEnv::repmgr_start()">DbEnv::repmgr_start()</a> has been called with a <code class="literal">0</code> return code. </p> <p> The <code class="methodname">DbEnv::repmgr_channel()</code> <span> <span> method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success. </span> </span> </p> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9843560"></a>Parameters</h3> </div> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp9843408"></a>eid</h4> </div> </div> </div> <p> This parameter must be set to one of the following: </p> <div class="itemizedlist"> <ul type="disc"> <li> <p> The numerical env ID of a remote site in the replication group. </p> </li> <li> <p> <code class="literal">DB_EID_MASTER</code> </p> <p> Messages sent on this channel are sent only to the master site. Note that messages are always sent to the current master, even if the master has changed since the channel was opened. If the current master is disconnected or unknown, the operation fails and repmgr returns an error code. </p> <p> If the local site is the master, then sending messages on this channel will result in the local site receiving those messages echoed back to itself. </p> </li> </ul> </div> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp9849240"></a>channelp</h4> </div> </div> </div> <p> References memory into which a pointer to the allocated handle is copied. </p> </div> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp9846952"></a>flags</h4> </div> </div> </div> <p> This parameter is currently unused, and must be set to 0. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9845872"></a>Errors</h3> </div> </div> </div> <p> The <code class="methodname">DbEnv::repmgr_channel()</code> <span> <span> method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a> exception, encapsulating one of the following non-zero errors, or return one of the following non-zero errors: </span> </span> </p> <div class="sect3" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h4 class="title"><a id="idp9857288"></a>EINVAL</h4> </div> </div> </div> <p> If this method is called from a Base API application; or if an invalid flag value or parameter was specified. </p> </div> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9856208"></a>Class</h3> </div> </div> </div> <p> <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a> </p> </div> <div class="sect2" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h3 class="title"><a id="idp9851896"></a>See Also</h3> </div> </div> </div> <p> <a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="repsync.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="rep.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="repmgr_local_site.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">DbEnv::rep_sync() </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> DbEnv::repmgr_local_site()</td> </tr> </table> </div> </body> </html>