ovsdb/log.h

   1 /* Copyright (c) 2009, 2010, 2011 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #ifndef OVSDB_LOG_H
  17 #define OVSDB_LOG_H 1
  18
  19 #include <sys/types.h>
  20 #include "compiler.h"
  21
  22 struct json;
  23 struct ovsdb_log;
  24
  25 /* Access mode for opening an OVSDB log. */
  26 enum ovsdb_log_open_mode {
  27     OVSDB_LOG_READ_ONLY,        /* Open existing file, read-only. */
  28     OVSDB_LOG_READ_WRITE,       /* Open existing file, read/write. */
  29     OVSDB_LOG_CREATE            /* Create new file, read/write. */
  30 };
  31
  32 struct ovsdb_error *ovsdb_log_open(const char *name, enum ovsdb_log_open_mode,
  33                                    int locking, struct ovsdb_log **)
  34     WARN_UNUSED_RESULT;
  35 void ovsdb_log_close(struct ovsdb_log *);
  36
  37 struct ovsdb_error *ovsdb_log_read(struct ovsdb_log *, struct json **)
  38     WARN_UNUSED_RESULT;
  39 void ovsdb_log_unread(struct ovsdb_log *);
  40
  41 struct ovsdb_error *ovsdb_log_write(struct ovsdb_log *, struct json *)
  42     WARN_UNUSED_RESULT;
  43 struct ovsdb_error *ovsdb_log_commit(struct ovsdb_log *)
  44     WARN_UNUSED_RESULT;
  45
  46 off_t ovsdb_log_get_offset(const struct ovsdb_log *);
  47
  48 #endif /* ovsdb/log.h */