An archive library is loaded by dynamically loading a shared library with the
archive_library'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
_PG_archive_module_init
. The result of the function
must be a pointer to a struct of type
ArchiveModuleCallbacks
, which contains everything
that the core code needs to know how to make use of the archive module. The
return value needs to be of server lifetime, which is typically achieved by
defining it as a static const
variable in global scope.
typedef struct ArchiveModuleCallbacks { ArchiveStartupCB startup_cb; ArchiveCheckConfiguredCB check_configured_cb; ArchiveFileCB archive_file_cb; ArchiveShutdownCB shutdown_cb; } ArchiveModuleCallbacks; typedef const ArchiveModuleCallbacks *(*ArchiveModuleInit) (void);
Only the archive_file_cb
callback is required. The
others are optional.