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/* alock.h - access lock header */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2005-2018 The OpenLDAP Foundation.
* Portions Copyright 2004-2005 Symas Corporation.
* 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 Emily Backes at Symas
* Corporation for inclusion in OpenLDAP Software.
*/
#ifndef _ALOCK_H_
#define _ALOCK_H_
#include "portable.h"
#include <ac/time.h>
#include <ac/unistd.h>
/* environment states (all the slots together) */
#define ALOCK_CLEAN (0)
#define ALOCK_RECOVER (1)
#define ALOCK_BUSY (2)
#define ALOCK_UNSTABLE (3)
/* lock user types and states */
#define ALOCK_UNLOCKED (0)
#define ALOCK_LOCKED (1)
#define ALOCK_UNIQUE (2)
#define ALOCK_DIRTY (3)
#define ALOCK_SMASK 3
/* lock/state where recovery is not available */
#define ALOCK_NOSAVE 4
/* constants */
#define ALOCK_SLOT_SIZE (1024)
#define ALOCK_SLOT_IATTRS (4)
#define ALOCK_MAX_APPNAME (ALOCK_SLOT_SIZE - 8 * ALOCK_SLOT_IATTRS)
#define ALOCK_MAGIC (0x12345678)
LDAP_BEGIN_DECL
typedef struct alock_info {
int al_fd;
int al_slot;
} alock_info_t;
typedef struct alock_slot {
unsigned int al_lock;
time_t al_stamp;
pid_t al_pid;
char * al_appname;
} alock_slot_t;
LDAP_SLAPD_F (int) alock_open LDAP_P(( alock_info_t * info, const char * appname,
const char * envdir, int locktype ));
LDAP_SLAPD_F (int) alock_scan LDAP_P(( alock_info_t * info ));
LDAP_SLAPD_F (int) alock_close LDAP_P(( alock_info_t * info, int nosave ));
LDAP_SLAPD_F (int) alock_recover LDAP_P(( alock_info_t * info ));
LDAP_END_DECL
#endif
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