dan
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*
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** 2010 February 1
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This header file defines the interface to the write-ahead logging
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** system. Refer to the comments below and the header comment attached to
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** the implementation of each function in log.c for further details.
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*/
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#ifndef _LOG_H_
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#define _LOG_H_
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#include "sqliteInt.h"
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/* Flags that may be set in the 'flags' argument to sqlite3LogWrite(): */
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#define LOG_MASK_COMMIT 0x08
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#define LOG_MASK_MASTERJOURNAL 0x10
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#define LOG_MASK_TRUNCATE 0x20
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#define LOG_TRUNCATE_BIT 0x80000000
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/* Connection to a log file. There is one object of this type for each pager. */
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typedef struct Log Log;
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/* Open and close a connection to a log file. */
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int sqlite3LogOpen(sqlite3_vfs*, const char *zDb, Log **ppLog);
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int sqlite3LogClose(Log *pLog, sqlite3_file *pFd, u8 *zBuf);
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/* Configure the log connection. */
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void sqlite3LogSetSyncflags(Log *, int sync_flags);
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/* Used by readers to open (lock) and close (unlock) a database snapshot. */
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int sqlite3LogOpenSnapshot(Log *pLog, int *);
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void sqlite3LogCloseSnapshot(Log *pLog);
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/* Read a page from the log, if it is present. */
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int sqlite3LogRead(Log *pLog, Pgno pgno, int *pInLog, u8 *pOut);
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void sqlite3LogMaxpgno(Log *pLog, Pgno *pPgno);
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/* Obtain or release the WRITER lock. */
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int sqlite3LogWriteLock(Log *pLog, int op);
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/* Write a segment to the log. */
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int sqlite3LogFrames(Log *pLog, int, PgHdr *, Pgno, int, int);
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/* Copy pages from the log to the database file */
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int sqlite3LogCheckpoint(
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Log *pLog, /* Log connection */
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sqlite3_file *pFd, /* File descriptor open on db file */
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u8 *zBuf, /* Temporary buffer to use */
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int (*xBusyHandler)(void *), /* Pointer to busy-handler function */
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void *pBusyHandlerArg /* Argument to pass to xBusyHandler */
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);
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#endif /* _LOG_H_ */
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