PostgreSQL Source Code: src/backend/access/rmgrdesc/clogdesc.c Source File

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clogdesc.c
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1/*-------------------------------------------------------------------------
2 *
3 * clogdesc.c
4 * rmgr descriptor routines for access/transam/clog.c
5 *
6 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/access/rmgrdesc/clogdesc.c
12 *
13 *-------------------------------------------------------------------------
14 */
15#include "postgres.h"
16
17#include "access/clog.h"
18
19
20void
21 clog_desc(StringInfo buf, XLogReaderState *record)
22{
23 char *rec = XLogRecGetData(record);
24 uint8 info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
25
26 if (info == CLOG_ZEROPAGE)
27 {
28 int64 pageno;
29
30 memcpy(&pageno, rec, sizeof(pageno));
31 appendStringInfo(buf, "page %" PRId64, pageno);
32 }
33 else if (info == CLOG_TRUNCATE)
34 {
35 xl_clog_truncate xlrec;
36
37 memcpy(&xlrec, rec, sizeof(xl_clog_truncate));
38 appendStringInfo(buf, "page %" PRId64 "; oldestXact %u",
39 xlrec.pageno, xlrec.oldestXact);
40 }
41}
42
43const char *
44 clog_identify(uint8 info)
45{
46 const char *id = NULL;
47
48 switch (info & ~XLR_INFO_MASK)
49 {
50 case CLOG_ZEROPAGE:
51 id = "ZEROPAGE";
52 break;
53 case CLOG_TRUNCATE:
54 id = "TRUNCATE";
55 break;
56 }
57
58 return id;
59}
uint8_t uint8
Definition: c.h:536
int64_t int64
Definition: c.h:535
#define CLOG_ZEROPAGE
Definition: clog.h:55
#define CLOG_TRUNCATE
Definition: clog.h:56
void clog_desc(StringInfo buf, XLogReaderState *record)
Definition: clogdesc.c:21
const char * clog_identify(uint8 info)
Definition: clogdesc.c:44
static char * buf
Definition: pg_test_fsync.c:72
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:145
Definition: clog.h:33
int64 pageno
Definition: clog.h:34
TransactionId oldestXact
Definition: clog.h:35
#define XLogRecGetInfo(decoder)
Definition: xlogreader.h:410
#define XLogRecGetData(decoder)
Definition: xlogreader.h:415
#define XLR_INFO_MASK
Definition: xlogrecord.h:62

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