/* unbind.c - ldap backend unbind function */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1999-2005 The OpenLDAP Foundation.
 * Portions Copyright 1999-2003 Howard Chu.
 * Portions Copyright 2000-2003 Pierangelo Masarati.
 * 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
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was initially developed by the Howard Chu for inclusion
 * in OpenLDAP Software and subsequently enhanced by Pierangelo
 * Masarati.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>

#include "slap.h"
#include "back-ldap.h"

int
ldap_back_conn_destroy(
		Backend		*be,
		Connection	*conn
)
{
	struct ldapinfo	*li = (struct ldapinfo *) be->be_private;
	struct ldapconn *lc = NULL, lc_curr;

	Debug( LDAP_DEBUG_TRACE,
		"=>ldap_back_conn_destroy: fetching conn %ld\n",
		conn->c_connid, 0, 0 );

	lc_curr.lc_conn = conn;
	lc_curr.lc_local_ndn = conn->c_ndn;
	
retry_lock:;
	switch ( ldap_pvt_thread_mutex_trylock( &li->conn_mutex ) ) {
	case LDAP_PVT_THREAD_EBUSY:
	default:
		ldap_pvt_thread_yield();
		goto retry_lock;

	case 0:
		break;
	}

	lc = avl_delete( &li->conntree, (caddr_t)&lc_curr, ldap_back_conn_cmp );
	ldap_pvt_thread_mutex_unlock( &li->conn_mutex );

	if ( lc ) {
		Debug( LDAP_DEBUG_TRACE,
			"=>ldap_back_conn_destroy: destroying conn %ld (refcnt=%u)\n",
			lc->lc_conn->c_connid, lc->lc_refcnt, 0 );

		assert( lc->lc_refcnt == 0 );

		/*
		 * Needs a test because the handler may be corrupted,
		 * and calling ldap_unbind on a corrupted header results
		 * in a segmentation fault
		 */
		ldap_back_conn_free( lc );
	}

	/* no response to unbind */

	return 0;
}