external/bsd/openldap/dist/servers/slapd/back-bdb/nextid.c

   1 /* init.c - initialize bdb backend */
   2 /* $OpenLDAP: pkg/ldap/servers/slapd/back-bdb/nextid.c,v 1.26.2.4 2008/02/12 00:34:58 quanah Exp $ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2000-2008 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20 #include <ac/string.h>
  21
  22 #include "back-bdb.h"
  23
  24 int bdb_next_id( BackendDB *be, ID *out )
  25 {
  26         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
  27
  28         ldap_pvt_thread_mutex_lock( &bdb->bi_lastid_mutex );
  29         *out = ++bdb->bi_lastid;
  30         ldap_pvt_thread_mutex_unlock( &bdb->bi_lastid_mutex );
  31
  32         return 0;
  33 }
  34
  35 int bdb_last_id( BackendDB *be, DB_TXN *tid )
  36 {
  37         struct bdb_info *bdb = (struct bdb_info *) be->be_private;
  38         int rc;
  39         ID id = 0;
  40         unsigned char idbuf[sizeof(ID)];
  41         DBT key, data;
  42         DBC *cursor;
  43
  44         DBTzero( &key );
  45         key.flags = DB_DBT_USERMEM;
  46         key.data = (char *) idbuf;
  47         key.ulen = sizeof( idbuf );
  48
  49         DBTzero( &data );
  50         data.flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;
  51
  52         /* Get a read cursor */
  53         rc = bdb->bi_id2entry->bdi_db->cursor( bdb->bi_id2entry->bdi_db,
  54                 tid, &cursor, 0 );
  55
  56         if (rc == 0) {
  57                 rc = cursor->c_get(cursor, &key, &data, DB_LAST);
  58                 cursor->c_close(cursor);
  59         }
  60
  61         switch(rc) {
  62         case DB_NOTFOUND:
  63                 rc = 0;
  64                 break;
  65         case 0:
  66                 BDB_DISK2ID( idbuf, &id );
  67                 break;
  68
  69         default:
  70                 Debug( LDAP_DEBUG_ANY,
  71                         "=> bdb_last_id: get failed: %s (%d)\n",
  72                         db_strerror(rc), rc, 0 );
  73                 goto done;
  74         }
  75
  76         bdb->bi_lastid = id;
  77
  78 done:
  79         return rc;
  80 }