Berkeley DB 4.8 with rust build script for linux.

1 files changed, 108 insertions, 0 deletions

diff --git a/db-4.8.30/examples_c/ex_apprec/ex_apprec_rec.c b/db-4.8.30/examples_c/ex_apprec/ex_apprec_rec.c
new file mode 100644
index 0000000..338b454
--- /dev/null
+++ b/db-4.8.30/examples_c/ex_apprec/ex_apprec_rec.c
@@ -0,0 +1,108 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996-2009 Oracle.  All rights reserved.
+ *
+ * $Id$
+ */
+
+/*
+ * This file is based on the template file ex_apprec_template.  Note that
+ * because ex_apprec_mkdir, like most application-specific recovery functions,
+ * does not make use of DB-private structures, it has actually been simplified
+ * significantly.
+ */
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include <db.h>
+
+#include "ex_apprec.h"
+
+/*
+ * ex_apprec_mkdir_recover --
+ *	Recovery function for mkdir.
+ *
+ * PUBLIC: int ex_apprec_mkdir_recover
+ * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops));
+ */
+int
+ex_apprec_mkdir_recover(dbenv, dbtp, lsnp, op)
+	DB_ENV *dbenv;
+	DBT *dbtp;
+	DB_LSN *lsnp;
+	db_recops op;
+{
+	ex_apprec_mkdir_args *argp;
+	int ret;
+
+	argp = NULL;
+
+#ifdef DEBUG_RECOVER
+	ex_apprec_mkdir_print(dbenv, dbtp, lsnp, op);
+#endif
+	if ((ret = ex_apprec_mkdir_read(dbenv, dbtp->data, &argp)) != 0)
+		goto out;
+
+	switch (op) {
+	case DB_TXN_ABORT:
+	case DB_TXN_BACKWARD_ROLL:
+		/*
+		 * If we're aborting, we need to remove the directory if it
+		 * exists.  We log the trailing zero in pathnames, so we can
+		 * simply pass the data part of the DBT into rmdir as a string.
+		 * (Note that we don't have any alignment guarantees, but for
+		 * a char * this doesn't matter.)
+		 *
+		 * Ignore all errors other than ENOENT;  DB may attempt to undo
+		 * or redo operations without knowing whether they have already
+		 * been done or undone, so we should never assume in a recovery
+		 * function that the task definitely needs doing or undoing.
+		 */
+		ret = rmdir(argp->dirname.data);
+		if (ret != 0 && errno != ENOENT)
+			dbenv->err(dbenv, ret, "Error in abort of mkdir");
+		else
+			ret = 0;
+		break;
+	case DB_TXN_FORWARD_ROLL:
+		/*
+		 * The forward direction is just the opposite;  here, we ignore
+		 * EEXIST, because the directory may already exist.
+		 */
+		ret = mkdir(argp->dirname.data, 0755);
+		if (ret != 0 && errno != EEXIST)
+			dbenv->err(dbenv,
+			    ret, "Error in roll-forward of mkdir");
+		else
+			ret = 0;
+		break;
+	default:
+		/*
+		 * We might want to handle DB_TXN_PRINT or DB_TXN_APPLY here,
+		 * too, but we don't try to print the log records and aren't
+		 * using replication, so there's no need to in this example.
+		 */
+		dbenv->errx(dbenv, "Unexpected operation type\n");
+		return (EINVAL);
+	}
+
+	/*
+	 * The recovery function is responsible for returning the LSN of the
+	 * previous log record in this transaction, so that transaction aborts
+	 * can follow the chain backwards.
+	 *
+	 * (If we'd wanted the LSN of this record earlier, we could have
+	 * read it from lsnp, as well--but because we weren't working with
+	 * pages or other objects that store their LSN and base recovery
+	 * decisions on it, we didn't need to.)
+	 */
+	*lsnp = argp->prev_lsn;
+
+out:	if (argp != NULL)
+		free(argp);
+	return (ret);
+}