postgresql/src/backend/access/rmgrdesc/clogdesc.c

/*-------------------------------------------------------------------------
 *
 * clogdesc.c
 *	  rmgr descriptor routines for access/transam/clog.c
 *
 * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  src/backend/access/rmgrdesc/clogdesc.c
 *
 *-------------------------------------------------------------------------
 */
#include "postgres.h"

#include "access/clog.h"


void
clog_desc(StringInfo buf, XLogRecord *record)
{
	char	   *rec = XLogRecGetData(record);
	uint8		info = record->xl_info & ~XLR_INFO_MASK;

	if (info == CLOG_ZEROPAGE)
	{
		int			pageno;

		memcpy(&pageno, rec, sizeof(int));
		appendStringInfo(buf, "zeropage: %d", pageno);
	}
	else if (info == CLOG_TRUNCATE)
	{
		int			pageno;

		memcpy(&pageno, rec, sizeof(int));
		appendStringInfo(buf, "truncate before: %d", pageno);
	}
	else
		appendStringInfoString(buf, "UNKNOWN");
}