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/*-------------------------------------------------------------------------
*
* walmethods.h
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/bin/pg_basebackup/walmethods.h
*-------------------------------------------------------------------------
*/
typedef void *Walfile;
typedef enum
{
CLOSE_NORMAL,
CLOSE_UNLINK,
CLOSE_NO_RENAME
} WalCloseMethod;
typedef struct WalWriteMethod WalWriteMethod;
struct WalWriteMethod
{
Walfile(*open_for_write) (const char *pathname, const char *temp_suffix, size_t pad_to_size);
int (*close) (Walfile f, WalCloseMethod method);
bool (*existsfile) (const char *pathname);
ssize_t (*get_file_size) (const char *pathname);
ssize_t (*write) (Walfile f, const void *buf, size_t count);
off_t (*get_current_pos) (Walfile f);
int (*sync) (Walfile f);
bool (*finish) (void);
char *(*getlasterror) (void);
};
/*
* Available WAL methods:
* - WalDirectoryMethod - write WAL to regular files in a standard pg_xlog
* - TarDirectoryMethod - write WAL to a tarfile corresponding to pg_xlog
* (only implements the methods required for pg_basebackup,
* not all those required for pg_receivexlog)
*/
WalWriteMethod *CreateWalDirectoryMethod(const char *basedir, bool sync);
WalWriteMethod *CreateWalTarMethod(const char *tarbase, int compression, bool sync);
/* Cleanup routines for previously-created methods */
void FreeWalDirectoryMethod(void);
void FreeWalTarMethod(void);
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