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<!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>51.1. Initialization Functions</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="archive-modules.html" title="Chapter 51. Archive Modules" /><link rel="next" href="archive-module-callbacks.html" title="51.2. Archive Module Callbacks" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">51.1. Initialization Functions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="archive-modules.html" title="Chapter 51. Archive Modules">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="archive-modules.html" title="Chapter 51. Archive Modules">Up</a></td><th width="60%" align="center">Chapter 51. Archive Modules</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="archive-module-callbacks.html" title="51.2. Archive Module Callbacks">Next</a></td></tr></table><hr /></div><div class="sect1" id="ARCHIVE-MODULE-INIT"><div class="titlepage"><div><div><h2 class="title" style="clear: both">51.1. Initialization Functions</h2></div></div></div><a id="id-1.8.16.7.2" class="indexterm"></a><p>
An archive library is loaded by dynamically loading a shared library with the
<a class="xref" href="runtime-config-wal.html#GUC-ARCHIVE-LIBRARY">archive_library</a>'s name as the library base name. The
normal library search path is used to locate the library. To provide the
required archive module callbacks and to indicate that the library is
actually an archive module, it needs to provide a function named
<code class="function">_PG_archive_module_init</code>. This function is passed a
struct that needs to be filled with the callback function pointers for
individual actions.
</p><pre class="programlisting">
typedef struct ArchiveModuleCallbacks
{
ArchiveCheckConfiguredCB check_configured_cb;
ArchiveFileCB archive_file_cb;
ArchiveShutdownCB shutdown_cb;
} ArchiveModuleCallbacks;
typedef void (*ArchiveModuleInit) (struct ArchiveModuleCallbacks *cb);
</pre><p>
Only the <code class="function">archive_file_cb</code> callback is required. The
others are optional.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="archive-modules.html" title="Chapter 51. Archive Modules">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="archive-modules.html" title="Chapter 51. Archive Modules">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="archive-module-callbacks.html" title="51.2. Archive Module Callbacks">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 51. Archive Modules </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 51.2. Archive Module Callbacks</td></tr></table></div></body></html>
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