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/*-------------------------------------------------------------------------
*
* pgarch.h
* Exports from postmaster/pgarch.c.
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/postmaster/pgarch.h
*
*-------------------------------------------------------------------------
*/
#ifndef _PGARCH_H
#define _PGARCH_H
/* ----------
* Archiver control info.
*
* We expect that archivable files within pg_wal will have names between
* MIN_XFN_CHARS and MAX_XFN_CHARS in length, consisting only of characters
* appearing in VALID_XFN_CHARS. The status files in archive_status have
* corresponding names with ".ready" or ".done" appended.
* ----------
*/
#define MIN_XFN_CHARS 16
#define MAX_XFN_CHARS 40
#define VALID_XFN_CHARS "0123456789ABCDEF.history.backup.partial"
extern Size PgArchShmemSize(void);
extern void PgArchShmemInit(void);
extern bool PgArchCanRestart(void);
extern void PgArchiverMain(void) pg_attribute_noreturn();
extern void PgArchWakeup(void);
extern void PgArchForceDirScan(void);
/*
* The value of the archive_library GUC.
*/
extern PGDLLIMPORT char *XLogArchiveLibrary;
/*
* Archive module callbacks
*
* These callback functions should be defined by archive libraries and returned
* via _PG_archive_module_init(). ArchiveFileCB is the only required callback.
* For more information about the purpose of each callback, refer to the
* archive modules documentation.
*/
typedef bool (*ArchiveCheckConfiguredCB) (void);
typedef bool (*ArchiveFileCB) (const char *file, const char *path);
typedef void (*ArchiveShutdownCB) (void);
typedef struct ArchiveModuleCallbacks
{
ArchiveCheckConfiguredCB check_configured_cb;
ArchiveFileCB archive_file_cb;
ArchiveShutdownCB shutdown_cb;
} ArchiveModuleCallbacks;
/*
* Type of the shared library symbol _PG_archive_module_init that is looked
* up when loading an archive library.
*/
typedef void (*ArchiveModuleInit) (ArchiveModuleCallbacks *cb);
/*
* Since the logic for archiving via a shell command is in the core server
* and does not need to be loaded via a shared library, it has a special
* initialization function.
*/
extern void shell_archive_init(ArchiveModuleCallbacks *cb);
#endif /* _PGARCH_H */
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