mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/* csn.c - Change Sequence Number routines */
|
|
/* $OpenLDAP$ */
|
|
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
|
|
*
|
|
* Copyright 2000-2005 The OpenLDAP Foundation.
|
|
* Portions Copyright 2000-2003 Kurt D. Zeilenga.
|
|
* 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>.
|
|
*/
|
|
/* Portions Copyright 2000, John E. Schimmel, All rights reserved.
|
|
* This software is not subject to any license of Mirapoint, Inc.
|
|
*
|
|
* This is free software; you can redistribute and use it
|
|
* under the same terms as OpenLDAP itself.
|
|
*/
|
|
/* This work was developed by John E. Schimmel and adapted for
|
|
* inclusion in OpenLDAP Software by Kurt D. Zeilenga.
|
|
*/
|
|
|
|
/* This file contains routines to generate a change sequence number.
|
|
* Every add, delete, and modification is given a unique identifier
|
|
* for use in resolving conflicts during replication operations.
|
|
*
|
|
* These routines are (loosly) based upon draft-ietf-ldup-model-03.txt,
|
|
* A WORK IN PROGRESS. The format will likely change.
|
|
*
|
|
* The format of a CSN string is: yyyymmddhhmmssz#s#r#c
|
|
* where s is a counter of operations within a timeslice, r is
|
|
* the replica id (normally zero), and c is a counter of
|
|
* modifications within this operation. s, r, and c are
|
|
* represented in hex and zero padded to lengths of 6, 2, and
|
|
* 6, respectively.
|
|
*
|
|
* Calls to this routine MUST be serialized with other calls
|
|
* to gmtime().
|
|
*/
|
|
#include "portable.h"
|
|
|
|
#include <stdio.h>
|
|
#include <ac/time.h>
|
|
|
|
#include <lutil.h>
|
|
|
|
size_t
|
|
lutil_csnstr(char *buf, size_t len, unsigned int replica, unsigned int mod)
|
|
{
|
|
static time_t csntime;
|
|
static unsigned int csnop;
|
|
|
|
time_t t;
|
|
unsigned int op;
|
|
struct tm *ltm;
|
|
#ifdef HAVE_GMTIME_R
|
|
struct tm ltm_buf;
|
|
#endif
|
|
int n;
|
|
|
|
time( &t );
|
|
if ( t > csntime ) {
|
|
csntime = t;
|
|
csnop = 0;
|
|
}
|
|
op = ++csnop;
|
|
|
|
#ifdef HAVE_GMTIME_R
|
|
ltm = gmtime_r( &t, <m_buf );
|
|
#else
|
|
ltm = gmtime( &t );
|
|
#endif
|
|
n = snprintf( buf, len,
|
|
"%4d%02d%02d%02d%02d%02dZ#%06x#%02x#%06x",
|
|
ltm->tm_year + 1900, ltm->tm_mon + 1, ltm->tm_mday, ltm->tm_hour,
|
|
ltm->tm_min, ltm->tm_sec, op, replica, mod );
|
|
|
|
if( n < 0 ) return 0;
|
|
return ( (size_t) n < len ) ? n : 0;
|
|
}
|
|
|
|
#ifdef TEST
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
char buf[ LDAP_LUTIL_CSNSTR_BUFSIZE ];
|
|
|
|
if ( ! lutil_csnstr( buf, (size_t) 10, 0, 0 ) ) {
|
|
fprintf(stderr, "failed lutil_csnstr\n");
|
|
}
|
|
if ( ! lutil_csnstr( buf, sizeof(buf), 0, 0 ) ) {
|
|
fprintf(stderr, "failed lutil_csnstr\n");
|
|
}
|
|
}
|
|
#endif
|