usr/src/lib/libnisdb/nisdb_mt.cc

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include "nisdb_mt.h"
  28 #include "nisdb_rw.h"
  29
  30 #include "db_headers.h"
  31 #include "db_entry.h"
  32 #include "db.h"
  33 #include "db_dictionary.h"
  34
  35
  36 static nisdb_tsd_t      nisdb_shared_tsd;
  37 static pthread_key_t    nisdb_tsd_key;
  38
  39 void
  40 __nisdb_tsd_destroy(void *key) {
  41
  42         nisdb_tsd_t     *tsd = (nisdb_tsd_t *)key;
  43
  44         if (tsd != 0) {
  45                 free(tsd);
  46         }
  47 }
  48
  49 extern "C" {
  50 static void
  51 __nisdb_init_tsd_key(void)
  52 {
  53         (void) pthread_key_create(&nisdb_tsd_key, __nisdb_tsd_destroy);
  54 }
  55 #pragma init(__nisdb_init_tsd_key)
  56 }
  57
  58 nisdb_tsd_t *
  59 __nisdb_get_tsd(void) {
  60
  61         nisdb_tsd_t     *tsd;
  62
  63         if ((tsd = (nisdb_tsd_t *)pthread_getspecific(nisdb_tsd_key)) == 0) {
  64                 /* No TSD; create it */
  65                 if ((tsd = (nisdb_tsd_t *)malloc(sizeof (*tsd))) != 0) {
  66                         /* Initialize TSD */
  67                         memset(tsd, 0, sizeof (*tsd));
  68                         /* Register TSD */
  69                         if (pthread_setspecific(nisdb_tsd_key, tsd) != 0) {
  70                                 /* Can't store key */
  71 #ifdef  NISDB_MT_DEBUG
  72                                 abort();
  73 #endif
  74                                 free(tsd);
  75                                 tsd = &nisdb_shared_tsd;
  76                         }
  77                 } else {
  78                         /* No memory ? */
  79 #ifdef  NISDB_MT_DEBUG
  80                         abort();
  81 #endif
  82                         tsd = &nisdb_shared_tsd;
  83                 }
  84         }
  85
  86         return (tsd);
  87 }
  88
  89 void
  90 setMappingStatus(int nisPlusStat, int ldapStat) {
  91         nisdb_tsd_t     *tsd = __nisdb_get_tsd();
  92
  93         if (tsd != 0) {
  94                 tsd->nisPlusStat = nisPlusStat;
  95                 tsd->ldapStat = ldapStat;
  96         }
  97 }
  98
  99 /*
 100  * Save a copy of 'obj' in the TSD. If the TSD already holds an old object,
 101  * delete it before saving the new one.
 102  *
 103  * On successful exit, '*storedP' indicates whether or not the entry was
 104  * stored, and hence whether or not we're perfroming a modify operation.
 105  *
 106  * Return 1 if successful, 0 otherwise.
 107  */
 108 int
 109 saveOldObjForModify(entry_obj *obj, int *storedP) {
 110         nisdb_tsd_t     *tsd = __nisdb_get_tsd();
 111         int             stored;
 112
 113         if (tsd == 0)
 114                 return (0);
 115
 116         if ((stored = tsd->doingModify) != 0) {
 117                 entry_object    *eObj = tsd->oldObj;
 118
 119                 if (eObj != 0) {
 120                         free_entry(eObj);
 121                         tsd->oldObj = 0;
 122                 }
 123
 124                 if (obj != 0) {
 125                         eObj = new_entry((entry_object *)obj);
 126                         if (eObj == 0)
 127                                 return (0);
 128                 } else {
 129                         eObj = 0;
 130                 }
 131
 132                 tsd->oldObj = (entry_obj *)eObj;
 133         }
 134
 135         if (storedP != 0)
 136                 *storedP = stored;
 137
 138         return (1);
 139 }
 140
 141 /*
 142  * Retrieve (and remove) the old object (if any) from the TSD. Returns 1
 143  * if successful ('*oldObjP' might be NULL), 0 otherwise ('*oldObjP'
 144  * unchanged).
 145  */
 146 int
 147 retrieveOldObjForModify(entry_obj **oldObjP) {
 148         nisdb_tsd_t     *tsd = __nisdb_get_tsd();
 149
 150         if (tsd == 0 || oldObjP == 0)
 151                 return (0);
 152
 153         if (tsd->doingModify) {
 154                 *oldObjP = tsd->oldObj;
 155                 tsd->oldObj = 0;
 156         } else {
 157                 *oldObjP = 0;
 158         }
 159
 160         return (1);
 161 }