lib/libnisdb/nisdb_mt.cc

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "nisdb_mt.h"
#include "nisdb_rw.h"

#include "db_headers.h"
#include "db_entry.h"
#include "db.h"
#include "db_dictionary.h"


static nisdb_tsd_t  nisdb_shared_tsd;
static pthread_key_t    nisdb_tsd_key;

void
__nisdb_tsd_destroy(void *key) {

    nisdb_tsd_t *tsd = (nisdb_tsd_t *)key;

    if (tsd != 0) {
        free(tsd);
    }
}

extern "C" {
static void
__nisdb_init_tsd_key(void)
{
    (void) pthread_key_create(&nisdb_tsd_key, __nisdb_tsd_destroy);
}
#pragma init(__nisdb_init_tsd_key)
}

nisdb_tsd_t *
__nisdb_get_tsd(void) {

    nisdb_tsd_t *tsd;

    if ((tsd = (nisdb_tsd_t *)pthread_getspecific(nisdb_tsd_key)) == 0) {
        /* No TSD; create it */
        if ((tsd = (nisdb_tsd_t *)malloc(sizeof (*tsd))) != 0) {
            /* Initialize TSD */
            memset(tsd, 0, sizeof (*tsd));
            /* Register TSD */
            if (pthread_setspecific(nisdb_tsd_key, tsd) != 0) {
                /* Can't store key */
#ifdef  NISDB_MT_DEBUG
                abort();
#endif
                free(tsd);
                tsd = &nisdb_shared_tsd;
            }
        } else {
            /* No memory ? */
#ifdef  NISDB_MT_DEBUG
            abort();
#endif
            tsd = &nisdb_shared_tsd;
        }
    }

    return (tsd);
}

void
setMappingStatus(int nisPlusStat, int ldapStat) {
    nisdb_tsd_t *tsd = __nisdb_get_tsd();

    if (tsd != 0) {
        tsd->nisPlusStat = nisPlusStat;
        tsd->ldapStat = ldapStat;
    }
}

/*
 * Save a copy of 'obj' in the TSD. If the TSD already holds an old object,
 * delete it before saving the new one.
 *
 * On successful exit, '*storedP' indicates whether or not the entry was
 * stored, and hence whether or not we're perfroming a modify operation.
 *
 * Return 1 if successful, 0 otherwise.
 */
int
saveOldObjForModify(entry_obj *obj, int *storedP) {
    nisdb_tsd_t *tsd = __nisdb_get_tsd();
    int     stored;

    if (tsd == 0)
        return (0);

    if ((stored = tsd->doingModify) != 0) {
        entry_object    *eObj = tsd->oldObj;

        if (eObj != 0) {
            free_entry(eObj);
            tsd->oldObj = 0;
        }

        if (obj != 0) {
            eObj = new_entry((entry_object *)obj);
            if (eObj == 0)
                return (0);
        } else {
            eObj = 0;
        }

        tsd->oldObj = (entry_obj *)eObj;
    }

    if (storedP != 0)
        *storedP = stored;

    return (1);
}

/*
 * Retrieve (and remove) the old object (if any) from the TSD. Returns 1
 * if successful ('*oldObjP' might be NULL), 0 otherwise ('*oldObjP'
 * unchanged).
 */
int
retrieveOldObjForModify(entry_obj **oldObjP) {
    nisdb_tsd_t *tsd = __nisdb_get_tsd();

    if (tsd == 0 || oldObjP == 0)
        return (0);

    if (tsd->doingModify) {
        *oldObjP = tsd->oldObj;
        tsd->oldObj = 0;
    } else {
        *oldObjP = 0;
    }

    return (1);
}