clogdesc.c

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/*-------------------------------------------------------------------------
 *
 * clogdesc.c
 *    rmgr descriptor routines for access/transam/clog.c
 *
 * Portions Copyright (c) 1996-2025, 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, XLogReaderState *record)
{
    char       *rec = XLogRecGetData(record);
    uint8       info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
 
    if (info == CLOG_ZEROPAGE)
    {
        int64       pageno;
 
        memcpy(&pageno, rec, sizeof(pageno));
        appendStringInfo(buf, "page %lld", (long long) pageno);
    }
    else if (info == CLOG_TRUNCATE)
    {
        xl_clog_truncate xlrec;
 
        memcpy(&xlrec, rec, sizeof(xl_clog_truncate));
        appendStringInfo(buf, "page %lld; oldestXact %u",
                         (long long) xlrec.pageno, xlrec.oldestXact);
    }
}
 
const char *
clog_identify(uint8 info)
{
    const char *id = NULL;
 
    switch (info & ~XLR_INFO_MASK)
    {
        case CLOG_ZEROPAGE:
            id = "ZEROPAGE";
            break;
        case CLOG_TRUNCATE:
            id = "TRUNCATE";
            break;
    }
 
    return id;
}