/* nextid.c - keep track of the next id to be given out */ /* $OpenLDAP: pkg/ldap/servers/slapd/back-ldbm/nextid.c,v 1.36.2.4 2007/01/02 21:44:03 kurt Exp $ */ /* This work is part of OpenLDAP Software . * * Copyright 1998-2007 The OpenLDAP Foundation. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted only as authorized by the OpenLDAP * Public License. * * A copy of this license is available in the file LICENSE in the * top-level directory of the distribution or, alternatively, at * . */ #include "portable.h" #include #include #include #include #include "slap.h" #include "back-ldbm.h" static int next_id_read( Backend *be, ID *idp ) { Datum key, data; DBCache *db; *idp = NOID; if ( (db = ldbm_cache_open( be, "nextid", LDBM_SUFFIX, LDBM_WRCREAT )) == NULL ) { Debug( LDAP_DEBUG_ANY, "Could not open/create nextid" LDBM_SUFFIX "\n", 0, 0, 0 ); return( -1 ); } ldbm_datum_init( key ); key.dptr = (char *) idp; key.dsize = sizeof(ID); data = ldbm_cache_fetch( db, key ); if( data.dptr != NULL ) { AC_MEMCPY( idp, data.dptr, sizeof( ID ) ); ldbm_datum_free( db->dbc_db, data ); } else { *idp = 1; } ldbm_cache_close( be, db ); return( 0 ); } int next_id_write( Backend *be, ID id ) { Datum key, data; DBCache *db; ID noid = NOID; int flags, rc = 0; if ( (db = ldbm_cache_open( be, "nextid", LDBM_SUFFIX, LDBM_WRCREAT )) == NULL ) { Debug( LDAP_DEBUG_ANY, "Could not open/create nextid" LDBM_SUFFIX "\n", 0, 0, 0 ); return( -1 ); } ldbm_datum_init( key ); ldbm_datum_init( data ); key.dptr = (char *) &noid; key.dsize = sizeof(ID); data.dptr = (char *) &id; data.dsize = sizeof(ID); flags = LDBM_REPLACE; if ( ldbm_cache_store( db, key, data, flags ) != 0 ) { rc = -1; } ldbm_cache_close( be, db ); return( rc ); } int next_id_get( Backend *be, ID *idp ) { struct ldbminfo *li = (struct ldbminfo *) be->be_private; int rc = 0; *idp = NOID; if ( li->li_nextid == NOID ) { if ( ( rc = next_id_read( be, idp ) ) ) { return( rc ); } li->li_nextid = *idp; } *idp = li->li_nextid; return( rc ); } int next_id( Backend *be, ID *idp ) { struct ldbminfo *li = (struct ldbminfo *) be->be_private; int rc = 0; if ( li->li_nextid == NOID ) { if ( ( rc = next_id_read( be, idp ) ) ) { return( rc ); } li->li_nextid = *idp; } *idp = li->li_nextid++; if ( next_id_write( be, li->li_nextid ) ) { rc = -1; } return( rc ); }