DEB htdig: Added to repository.

Signed-off-by: Slávek Banko <[email protected]>

1 files changed, 136 insertions, 0 deletions

diff --git a/debian/htdig/htdig-3.2.0b6/db/log_findckp.c b/debian/htdig/htdig-3.2.0b6/db/log_findckp.c
new file mode 100644
index 00000000..af2339b5
--- /dev/null
+++ b/debian/htdig/htdig-3.2.0b6/db/log_findckp.c
@@ -0,0 +1,136 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997, 1998, 1999
+ *	Sleepycat Software.  All rights reserved.
+ */
+
+#include "db_config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)log_findckp.c	11.1 (Sleepycat) 7/24/99";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <errno.h>
+#include <string.h>
+#endif
+
+#include "db_int.h"
+#include "log.h"
+#include "txn.h"
+
+/*
+ * CDB___log_findckp --
+ *
+ * Looks for the most recent checkpoint that occurs before the most recent
+ * checkpoint LSN, subject to the constraint that there must be at least two
+ * checkpoints.  The reason you need two checkpoints is that you might have
+ * crashed during the most recent one and may not have a copy of all the
+ * open files.  This is the point from which recovery can start and the
+ * point up to which archival/truncation can take place.  Checkpoints in
+ * the log look like:
+ *
+ * -------------------------------------------------------------------
+ *  | ckp A, ckplsn 100 |  .... record .... | ckp B, ckplsn 600 | ...
+ * -------------------------------------------------------------------
+ *         LSN 500                                 LSN 1000
+ *
+ * If we read what log returns from using the DB_CKP parameter to logput,
+ * we'll get the record at LSN 1000.  The checkpoint LSN there is 600.
+ * Now we have to scan backwards looking for a checkpoint before LSN 600.
+ * We find one at 500.  This means that we can truncate the log before
+ * 500 or run recovery beginning at 500.
+ *
+ * Returns 0 if we find a suitable checkpoint or we retrieved the first
+ * record in the log from which to start.  Returns DB_NOTFOUND if there
+ * are no log records, errno on error.
+ *
+ * PUBLIC: int CDB___log_findckp __P((DB_ENV *, DB_LSN *));
+ */
+int
+CDB___log_findckp(dbenv, lsnp)
+	DB_ENV *dbenv;
+	DB_LSN *lsnp;
+{
+	DBT data;
+	DB_LSN ckp_lsn, final_ckp, last_ckp, next_lsn;
+	__txn_ckp_args *ckp_args;
+	int ret;
+
+	/*
+	 * Need to find the appropriate point from which to begin
+	 * recovery.
+	 */
+	memset(&data, 0, sizeof(data));
+	if (F_ISSET(dbenv, DB_ENV_THREAD))
+		F_SET(&data, DB_DBT_MALLOC);
+	ZERO_LSN(ckp_lsn);
+	if ((ret = CDB_log_get(dbenv, &last_ckp, &data, DB_CHECKPOINT)) != 0) {
+		if (ret == ENOENT)
+			goto get_first;
+		else
+			return (ret);
+	}
+	final_ckp = last_ckp;
+
+	next_lsn = last_ckp;
+	do {
+		if (F_ISSET(dbenv, DB_ENV_THREAD))
+			CDB___os_free(data.data, data.size);
+
+		if ((ret = CDB_log_get(dbenv, &next_lsn, &data, DB_SET)) != 0)
+			return (ret);
+		if ((ret = CDB___txn_ckp_read(data.data, &ckp_args)) != 0) {
+			if (F_ISSET(dbenv, DB_ENV_THREAD))
+				CDB___os_free(data.data, data.size);
+			return (ret);
+		}
+		if (IS_ZERO_LSN(ckp_lsn))
+			ckp_lsn = ckp_args->ckp_lsn;
+		if (FLD_ISSET(dbenv->verbose, DB_VERB_CHKPOINT)) {
+			CDB___db_err(dbenv, "Checkpoint at: [%lu][%lu]",
+			    (u_long)last_ckp.file, (u_long)last_ckp.offset);
+			CDB___db_err(dbenv, "Checkpoint LSN: [%lu][%lu]",
+			    (u_long)ckp_args->ckp_lsn.file,
+			    (u_long)ckp_args->ckp_lsn.offset);
+			CDB___db_err(dbenv, "Previous checkpoint: [%lu][%lu]",
+			    (u_long)ckp_args->last_ckp.file,
+			    (u_long)ckp_args->last_ckp.offset);
+		}
+		last_ckp = next_lsn;
+		next_lsn = ckp_args->last_ckp;
+		CDB___os_free(ckp_args, sizeof(*ckp_args));
+
+		/*
+		 * Keep looping until either you 1) run out of checkpoints,
+		 * 2) you've found a checkpoint before the most recent
+		 * checkpoint's LSN and you have at least 2 checkpoints.
+		 */
+	} while (!IS_ZERO_LSN(next_lsn) &&
+	    (CDB_log_compare(&last_ckp, &ckp_lsn) > 0 ||
+	    CDB_log_compare(&final_ckp, &last_ckp) == 0));
+
+	if (F_ISSET(dbenv, DB_ENV_THREAD))
+		CDB___os_free(data.data, data.size);
+
+	/*
+	 * At this point, either, next_lsn is ZERO or ckp_lsn is the
+	 * checkpoint lsn and last_ckp is the LSN of the last checkpoint
+	 * before ckp_lsn.  If the compare in the loop is still true, then
+	 * next_lsn must be 0 and we need to roll forward from the
+	 * beginning of the log.
+	 */
+	if (CDB_log_compare(&last_ckp, &ckp_lsn) >= 0 ||
+	    CDB_log_compare(&final_ckp, &last_ckp) == 0) {
+get_first:	if ((ret = CDB_log_get(dbenv, &last_ckp, &data, DB_FIRST)) != 0)
+			return (ret);
+		if (F_ISSET(dbenv, DB_ENV_THREAD))
+			CDB___os_free(data.data, data.size);
+	}
+	*lsnp = last_ckp;
+
+	return (IS_ZERO_LSN(last_ckp) ? DB_NOTFOUND : 0);
+}