1 files changed, 59 insertions, 0 deletions
diff --git a/src/backend/access/rmgrdesc/clogdesc.c b/src/backend/access/rmgrdesc/clogdesc.c
new file mode 100644
index 0000000..8751373
--- /dev/null
+++ b/src/backend/access/rmgrdesc/clogdesc.c
@@ -0,0 +1,59 @@
+/*-------------------------------------------------------------------------
+ *
+ * clogdesc.c
+ *	  rmgr descriptor routines for access/transam/clog.c
+ *
+ * Portions Copyright (c) 1996-2022, 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)
+	{
+		int			pageno;
+
+		memcpy(&pageno, rec, sizeof(int));
+		appendStringInfo(buf, "page %d", pageno);
+	}
+	else if (info == CLOG_TRUNCATE)
+	{
+		xl_clog_truncate xlrec;
+
+		memcpy(&xlrec, rec, sizeof(xl_clog_truncate));
+		appendStringInfo(buf, "page %d; oldestXact %u",
+						 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;
+}