2011-09-13 17:44:24 +00:00
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<title>DbEnv::repmgr_channel()</title>
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<link rel="up" href="rep.html" title="Chapter 11. Replication Methods" />
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<p>Library Version 11.2.5.2</p>
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<table width="100%" summary="Navigation header">
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<th colspan="3" align="center">DbEnv::repmgr_channel()</th>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="repsync.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 11.
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Replication Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="repmgr_local_site.html">Next</a></td>
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<div>
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<h2 class="title" style="clear: both"><a id="repmgr_channel"></a>DbEnv::repmgr_channel()</h2>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::repmgr_channel(int eid, DB_CHANNEL **channelp, u_int32_t flags);</pre>
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<p>
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The <code class="methodname">DbEnv::repmgr_channel()</code> method returns a
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DbChannel handle. This is used to create and manage custom
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message traffic between the sites in the replication group.
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</p>
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<p>
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This method allocates memory for the handle, returning a pointer to
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the structure in the memory to which
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<span class="bold"><strong>channelp</strong></span> refers. To release the
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allocated memory and discard the handle, call the
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<a class="xref" href="dbchannel_close.html" title="DbChannel::close()">DbChannel::close()</a>
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method.
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</p>
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<p>
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The <code class="methodname">DbEnv::repmgr_channel()</code> method may be
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called at any time after
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<a class="xref" href="repmgrstart.html" title="DbEnv::repmgr_start()">DbEnv::repmgr_start()</a> has
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been called with a <code class="literal">0</code> return code.
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</p>
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<p>
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The <code class="methodname">DbEnv::repmgr_channel()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3644278"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3644289"></a>eid</h4>
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</div>
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</div>
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</div>
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<p>
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This parameter must be set to one of the following:
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</p>
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<div class="itemizedlist">
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<ul type="disc">
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<li>
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<p>
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The numerical env ID of a remote site in the
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replication group.
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</p>
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</li>
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<li>
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<p>
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<code class="literal">DB_EID_MASTER</code>
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</p>
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<p>
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Messages sent on this channel are sent only to the
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master site. Note that messages are always sent to
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the current master, even if the master has changed
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since the channel was opened. If the current
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master is disconnected or unknown, the operation
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fails and repmgr returns an error code.
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</p>
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<p>
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If the local site is the master, then sending
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messages on this channel will result in the local
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site receiving those messages echoed back to
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itself.
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</p>
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</li>
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</ul>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3644397"></a>channelp</h4>
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</div>
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</div>
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</div>
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<p>
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References memory into which a pointer to the
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allocated handle is copied.
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</p>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3644358"></a>flags</h4>
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</div>
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</div>
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</div>
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<p>
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This parameter is currently unused, and must be
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set to 0.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3644340"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::repmgr_channel()</code>
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<span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h4 class="title"><a id="id3644534"></a>EINVAL</h4>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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If this method is called from a Base API application;
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or if an invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3644516"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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2011-12-20 00:07:10 +00:00
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<h3 class="title"><a id="id3644455"></a>See Also</h3>
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2011-09-13 17:44:24 +00:00
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="rep.html#replist" title="Replication and Related Methods">Replication and Related Methods</a>
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</p>
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<td width="40%" align="left" valign="top">DbEnv::rep_sync() </td>
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