1 // This is a data store backend for the Citadel server which uses Berkeley DB.
3 // Copyright (c) 1987-2023 by the citadel.org team
5 // This program is open source software. Use, duplication, or disclosure
6 // is subject to the terms of the GNU General Public License, version 3.
8 // Citadel will checkpoint the db at the end of every session, but only if
9 // the specified number of kilobytes has been written, or if the specified
10 // number of minutes has passed, since the last checkpoint.
11 #define MAX_CHECKPOINT_KBYTES 256
12 #define MAX_CHECKPOINT_MINUTES 15
14 #include "../../sysdep.h"
20 #include <libcitadel.h>
21 #include "../../citserver.h"
22 #include "../../config.h"
23 #include "berkeley_db.h"
25 #if DB_VERSION_MAJOR < 18
26 #error Citadel requires Berkeley DB v18.0 or newer. Please upgrade.
29 // Globals (these are used across multiple functions in *this* module, but not elsewhere)
30 static DB *dbp[MAXCDB]; // One DB handle for each Citadel database
31 static DB_ENV *dbenv; // The DB environment (global)
34 // Thread-Specific-Storage items for this backend
36 DB_TXN *tid; /* Transaction handle */
37 DBC *cursors[MAXCDB]; /* Cursors, for traversals... */
40 pthread_key_t bdb_thread_key;
43 // Return a pointer to our thread-specific (not session-specific) data.
44 struct thread_tsd *bdb_tsd(void) {
46 struct thread_tsd *c = (struct thread_tsd *) pthread_getspecific(bdb_thread_key) ;
51 // If there's no TSD for this thread, it must be a new thread. Create our TSD region.
52 c = (struct thread_tsd *) malloc(sizeof(struct thread_tsd));
53 memset(c, 0, sizeof(struct thread_tsd));
54 pthread_setspecific(bdb_thread_key, (const void *) c);
55 syslog(LOG_DEBUG, "\033[31mCREATED %lx\033[0m", (long unsigned int)c);
60 // Called by other functions in this module to GTFO quickly if we need to. Not part of the backend API.
61 void bdb_abort(void) {
62 syslog(LOG_DEBUG, "bdb: citserver is stopping in order to prevent data loss. uid=%d gid=%d euid=%d egid=%d",
63 getuid(), getgid(), geteuid(), getegid()
65 raise(SIGABRT); // This will exit in a way that can produce a core dump if needed.
66 exit(CTDLEXIT_DB); // Exit if the signal failed to end the program.
70 // Verbose logging callback for Berkeley DB. Not part of the backend API.
71 void bdb_verbose_log(const DB_ENV *dbenv, const char *msg, const char *foo) {
72 if (!IsEmptyStr(msg)) {
73 syslog(LOG_DEBUG, "bdb: %s %s", msg, foo);
78 // Verbose error logging callback for Berkeley DB. Not part of the backend API.
79 void bdb_verbose_err(const DB_ENV *dbenv, const char *errpfx, const char *msg) {
80 syslog(LOG_ERR, "bdb: %s", msg);
84 // Wrapper for txn_abort() that logs/aborts on error. Not part of the backend API.
85 static void bdb_txabort(DB_TXN *tid) {
88 ret = tid->abort(tid);
91 syslog(LOG_ERR, "bdb: txn_abort: %s", db_strerror(ret));
97 // Wrapper for txn_commit() that logs/aborts on error. Not part of the backend API.
98 static void bdb_txcommit(DB_TXN *tid) {
101 ret = tid->commit(tid, 0);
104 syslog(LOG_ERR, "bdb: txn_commit: %s", db_strerror(ret));
110 // Wrapper for txn_begin() that logs/aborts on error. Not part of the backend API.
111 static void bdb_txbegin(DB_TXN **tid) {
114 ret = dbenv->txn_begin(dbenv, NULL, tid, 0);
117 syslog(LOG_ERR, "bdb: txn_begin: %s", db_strerror(ret));
123 // Panic callback for Berkeley DB. Not part of the backend API.
124 static void bdb_dbpanic(DB_ENV *env, int errval) {
125 syslog(LOG_ERR, "bdb: PANIC: %s", db_strerror(errval));
130 // Close a cursor -- not part of the backend API.
131 static void bdb_cclose(DBC *cursor) {
134 if ((ret = cursor->c_close(cursor))) {
135 syslog(LOG_ERR, "bdb: c_close: %s", db_strerror(ret));
141 // Convenience function to abort if a cursor is still open when we didn't expect it to be.
142 // This is not part of the backend API.
143 static void bdb_bailIfCursor(DBC **cursors, const char *msg) {
146 for (i = 0; i < MAXCDB; i++)
147 if (cursors[i] != NULL) {
148 syslog(LOG_ERR, "bdb: cursor still in progress on cdb %02x: %s", i, msg);
154 void bdb_check_handles(void) {
155 bdb_bailIfCursor(TSD->cursors, "in check_handles");
157 if (TSD->tid != NULL) {
158 syslog(LOG_ERR, "bdb: transaction still in progress!");
164 // Request a checkpoint of the database. Called once per minute by the thread manager.
165 void bdb_checkpoint(void) {
168 syslog(LOG_DEBUG, "bdb: -- checkpoint --");
169 ret = dbenv->txn_checkpoint(dbenv, MAX_CHECKPOINT_KBYTES, MAX_CHECKPOINT_MINUTES, 0);
172 syslog(LOG_ERR, "bdb: bdb_checkpoint() txn_checkpoint: %s", db_strerror(ret));
176 // After a successful checkpoint, we can cull the unused logs
177 if (CtdlGetConfigInt("c_auto_cull")) {
178 ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 1);
181 ret = dbenv->log_set_config(dbenv, DB_LOG_AUTO_REMOVE, 0);
186 // Open the various databases we'll be using. Any database which
187 // does not exist should be created. Note that we don't need a
188 // critical section here, because there aren't any active threads
189 // manipulating the database yet.
190 void bdb_open_databases(void) {
195 int dbversion_major, dbversion_minor, dbversion_patch;
197 syslog(LOG_DEBUG, "bdb: bdb_open_databases() starting");
198 syslog(LOG_DEBUG, "bdb: Linked zlib: %s", zlibVersion());
199 syslog(LOG_DEBUG, "bdb: Compiled libdb: %s", DB_VERSION_STRING);
200 syslog(LOG_DEBUG, "bdb: Linked libdb: %s", db_version(&dbversion_major, &dbversion_minor, &dbversion_patch));
202 // Create synthetic integer version numbers and compare them.
203 // Never allow citserver to run with a libdb older then the one with which it was compiled.
204 int compiled_db_version = ( (DB_VERSION_MAJOR * 1000000) + (DB_VERSION_MINOR * 1000) + (DB_VERSION_PATCH) );
205 int linked_db_version = ( (dbversion_major * 1000000) + (dbversion_minor * 1000) + (dbversion_patch) );
206 if (compiled_db_version > linked_db_version) {
207 syslog(LOG_ERR, "bdb: citserver is running with a version of libdb older than the one with which it was compiled.");
208 syslog(LOG_ERR, "bdb: This is an invalid configuration. citserver will now exit to prevent data loss.");
212 // Silently try to create the database subdirectory. If it's already there, no problem.
213 if ((mkdir(ctdl_db_dir, 0700) != 0) && (errno != EEXIST)) {
214 syslog(LOG_ERR, "bdb: database directory [%s] does not exist and could not be created: %m", ctdl_db_dir);
217 if (chmod(ctdl_db_dir, 0700) != 0) {
218 syslog(LOG_ERR, "bdb: unable to set database directory permissions [%s]: %m", ctdl_db_dir);
221 if (chown(ctdl_db_dir, CTDLUID, (-1)) != 0) {
222 syslog(LOG_ERR, "bdb: unable to set the owner for [%s]: %m", ctdl_db_dir);
225 syslog(LOG_DEBUG, "bdb: Setting up DB environment");
226 ret = db_env_create(&dbenv, 0);
228 syslog(LOG_ERR, "bdb: db_env_create: %s", db_strerror(ret));
229 syslog(LOG_ERR, "bdb: exit code %d", ret);
232 dbenv->set_errpfx(dbenv, "citserver");
233 dbenv->set_paniccall(dbenv, bdb_dbpanic);
234 dbenv->set_errcall(dbenv, bdb_verbose_err);
235 dbenv->set_msgcall(dbenv, bdb_verbose_log);
236 dbenv->set_verbose(dbenv, DB_VERB_DEADLOCK, 1);
237 dbenv->set_verbose(dbenv, DB_VERB_RECOVERY, 1);
239 // We want to specify the shared memory buffer pool cachesize, but everything else is the default.
240 ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0);
242 syslog(LOG_ERR, "bdb: set_cachesize: %s", db_strerror(ret));
243 dbenv->close(dbenv, 0);
244 syslog(LOG_ERR, "bdb: exit code %d", ret);
248 if ((ret = dbenv->set_lk_detect(dbenv, DB_LOCK_DEFAULT))) {
249 syslog(LOG_ERR, "bdb: set_lk_detect: %s", db_strerror(ret));
250 dbenv->close(dbenv, 0);
251 syslog(LOG_ERR, "bdb: exit code %d", ret);
255 flags = DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_INIT_TXN | DB_INIT_LOCK | DB_THREAD | DB_INIT_LOG;
256 syslog(LOG_DEBUG, "bdb: dbenv->open(dbenv, %s, %d, 0)", ctdl_db_dir, flags);
257 ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0); // try opening the database cleanly
258 if (ret == DB_RUNRECOVERY) {
259 syslog(LOG_ERR, "bdb: dbenv->open: %s", db_strerror(ret));
260 syslog(LOG_ERR, "bdb: attempting recovery...");
262 ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0); // try recovery
264 if (ret == DB_RUNRECOVERY) {
265 syslog(LOG_ERR, "bdb: dbenv->open: %s", db_strerror(ret));
266 syslog(LOG_ERR, "bdb: attempting catastrophic recovery...");
267 flags &= ~DB_RECOVER;
268 flags |= DB_RECOVER_FATAL;
269 ret = dbenv->open(dbenv, ctdl_db_dir, flags, 0); // try catastrophic recovery
272 syslog(LOG_ERR, "bdb: dbenv->open: %s", db_strerror(ret));
273 dbenv->close(dbenv, 0);
274 syslog(LOG_ERR, "bdb: exit code %d", ret);
278 syslog(LOG_INFO, "bdb: mounting databases");
279 for (i = 0; i < MAXCDB; ++i) {
280 ret = db_create(&dbp[i], dbenv, 0); // Create a database handle
282 syslog(LOG_ERR, "bdb: db_create: %s", db_strerror(ret));
283 syslog(LOG_ERR, "bdb: exit code %d", ret);
287 snprintf(dbfilename, sizeof dbfilename, "cdb.%02x", i); // table names by number
288 ret = dbp[i]->open(dbp[i], NULL, dbfilename, NULL, DB_BTREE, DB_CREATE | DB_AUTO_COMMIT | DB_THREAD, 0600);
290 syslog(LOG_ERR, "bdb: db_open[%02x]: %s", i, db_strerror(ret));
292 syslog(LOG_ERR, "bdb: You may need to tune your database; please check http://www.citadel.org for more information.");
294 syslog(LOG_ERR, "bdb: exit code %d", ret);
301 // Make sure we own all the files, because in a few milliseconds we're going to drop root privs.
302 void bdb_chmod_data(void) {
305 char filename[PATH_MAX];
307 dp = opendir(ctdl_db_dir);
309 while (d = readdir(dp), d != NULL) {
310 if (d->d_name[0] != '.') {
311 snprintf(filename, sizeof filename, "%s/%s", ctdl_db_dir, d->d_name);
312 syslog(LOG_DEBUG, "bdb: chmod(%s, 0600) returned %d", filename, chmod(filename, 0600));
313 syslog(LOG_DEBUG, "bdb: chown(%s, CTDLUID, -1) returned %d", filename, chown(filename, CTDLUID, (-1)));
321 // Close all of the db database files we've opened. This can be done in a loop, since it's just a bunch of closes.
322 void bdb_close_databases(void) {
326 static int closing = 0;
327 while (closing == 1) {
328 syslog(LOG_INFO, "bdb: already closing");
332 syslog(LOG_INFO, "bdb: performing final checkpoint");
333 if ((ret = dbenv->txn_checkpoint(dbenv, 0, 0, 0))) {
334 syslog(LOG_ERR, "bdb: txn_checkpoint: %s", db_strerror(ret));
337 syslog(LOG_INFO, "bdb: flushing the database logs");
338 if ((ret = dbenv->log_flush(dbenv, NULL))) {
339 syslog(LOG_ERR, "bdb: log_flush: %s", db_strerror(ret));
343 syslog(LOG_INFO, "bdb: closing databases");
344 for (i = 0; i < MAXCDB; ++i) {
345 syslog(LOG_INFO, "bdb: closing database %02x", i);
346 ret = dbp[i]->close(dbp[i], 0);
348 syslog(LOG_ERR, "bdb: db_close: %s", db_strerror(ret));
353 ret = dbenv->close(dbenv, DB_FORCESYNC);
355 syslog(LOG_ERR, "bdb: DBENV->close: %s", db_strerror(ret));
360 // Decompress a database item if it was compressed on disk
361 void bdb_decompress_if_necessary(struct cdbdata *cdb) {
362 static int magic = COMPRESS_MAGIC;
364 if ((cdb == NULL) || (cdb->ptr == NULL) || (cdb->len < sizeof(magic)) || (memcmp(cdb->ptr, &magic, sizeof(magic)))) {
368 // At this point we know we're looking at a compressed item.
370 struct CtdlCompressHeader zheader;
371 char *uncompressed_data;
372 char *compressed_data;
373 uLongf destLen, sourceLen;
376 memset(&zheader, 0, sizeof(struct CtdlCompressHeader));
377 cplen = sizeof(struct CtdlCompressHeader);
378 if (sizeof(struct CtdlCompressHeader) > cdb->len) {
381 memcpy(&zheader, cdb->ptr, cplen);
383 compressed_data = cdb->ptr;
384 compressed_data += sizeof(struct CtdlCompressHeader);
386 sourceLen = (uLongf) zheader.compressed_len;
387 destLen = (uLongf) zheader.uncompressed_len;
388 uncompressed_data = malloc(zheader.uncompressed_len);
390 if (uncompress((Bytef *) uncompressed_data,
391 (uLongf *) &destLen, (const Bytef *) compressed_data, (uLong) sourceLen) != Z_OK) {
392 syslog(LOG_ERR, "bdb: uncompress() error");
397 cdb->len = (size_t) destLen;
398 cdb->ptr = uncompressed_data;
402 // Store a piece of data. Returns 0 if the operation was successful. If a
403 // key already exists it should be overwritten.
404 int bdb_store(int cdb, const void *ckey, int ckeylen, void *cdata, int cdatalen) {
409 struct CtdlCompressHeader zheader;
410 char *compressed_data = NULL;
412 size_t buffer_len = 0;
415 memset(&dkey, 0, sizeof(DBT));
416 memset(&ddata, 0, sizeof(DBT));
418 dkey.data = (void *) ckey;
419 ddata.size = cdatalen;
422 // "visit" records are numerous and have big, mostly-empty string buffers in them.
423 // If we compress these we can get them down to 1% of their size most of the time.
424 if (cdb == CDB_VISIT) {
426 zheader.magic = COMPRESS_MAGIC;
427 zheader.uncompressed_len = cdatalen;
428 buffer_len = ((cdatalen * 101) / 100) + 100 + sizeof(struct CtdlCompressHeader);
429 destLen = (uLongf) buffer_len;
430 compressed_data = malloc(buffer_len);
431 if (compress2((Bytef *) (compressed_data + sizeof(struct CtdlCompressHeader)), &destLen, (Bytef *) cdata, (uLongf) cdatalen, 1) != Z_OK) {
432 syslog(LOG_ERR, "bdb: compress2() error");
435 zheader.compressed_len = (size_t) destLen;
436 memcpy(compressed_data, &zheader, sizeof(struct CtdlCompressHeader));
437 ddata.size = (size_t) (sizeof(struct CtdlCompressHeader) + zheader.compressed_len);
438 ddata.data = compressed_data;
441 if (TSD->tid != NULL) {
442 ret = dbp[cdb]->put(dbp[cdb], // db
443 TSD->tid, // transaction ID
449 syslog(LOG_ERR, "bdb: bdb_store(%d): %s", cdb, db_strerror(ret));
453 free(compressed_data);
458 bdb_bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
463 if ((ret = dbp[cdb]->put(dbp[cdb], // db
464 tid, // transaction ID
468 if (ret == DB_LOCK_DEADLOCK) {
473 syslog(LOG_ERR, "bdb: bdb_store(%d): %s", cdb, db_strerror(ret));
480 free(compressed_data);
489 // Delete a piece of data. Returns 0 if the operation was successful.
490 int bdb_delete(int cdb, void *key, int keylen) {
495 memset(&dkey, 0, sizeof dkey);
499 if (TSD->tid != NULL) {
500 ret = dbp[cdb]->del(dbp[cdb], TSD->tid, &dkey, 0);
502 syslog(LOG_ERR, "bdb: bdb_delete(%d): %s", cdb, db_strerror(ret));
503 if (ret != DB_NOTFOUND) {
509 bdb_bailIfCursor(TSD->cursors, "attempt to delete during r/o cursor");
514 if ((ret = dbp[cdb]->del(dbp[cdb], tid, &dkey, 0)) && ret != DB_NOTFOUND) {
515 if (ret == DB_LOCK_DEADLOCK) {
520 syslog(LOG_ERR, "bdb: bdb_delete(%d): %s", cdb, db_strerror(ret));
532 static DBC *bdb_localcursor(int cdb) {
536 if (TSD->cursors[cdb] == NULL) {
537 ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &curs, 0);
540 ret = TSD->cursors[cdb]->c_dup(TSD->cursors[cdb], &curs, DB_POSITION);
544 syslog(LOG_ERR, "bdb: bdb_localcursor: %s", db_strerror(ret));
552 // Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
553 // a struct cdbdata which it is the caller's responsibility to free later on
554 // using the bdb_free() routine.
555 struct cdbdata *bdb_fetch(int cdb, const void *key, int keylen) {
557 if (keylen == 0) { // key length zero is impossible
561 struct cdbdata *tempcdb;
565 memset(&dkey, 0, sizeof(DBT));
567 dkey.data = (void *) key;
569 if (TSD->tid != NULL) {
570 memset(&dret, 0, sizeof(DBT));
571 dret.flags = DB_DBT_MALLOC;
572 ret = dbp[cdb]->get(dbp[cdb], TSD->tid, &dkey, &dret, 0);
578 memset(&dret, 0, sizeof(DBT));
579 dret.flags = DB_DBT_MALLOC;
580 curs = bdb_localcursor(cdb);
581 ret = curs->c_get(curs, &dkey, &dret, DB_SET);
583 } while (ret == DB_LOCK_DEADLOCK);
586 if ((ret != 0) && (ret != DB_NOTFOUND)) {
587 syslog(LOG_ERR, "bdb: bdb_fetch(%d): %s", cdb, db_strerror(ret));
595 tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
596 if (tempcdb == NULL) {
597 syslog(LOG_ERR, "bdb: bdb_fetch() cannot allocate memory for tempcdb: %m");
601 tempcdb->len = dret.size;
602 tempcdb->ptr = dret.data;
603 bdb_decompress_if_necessary(tempcdb);
609 // Free a cdbdata item.
611 // Note that we only free the 'ptr' portion if it is not NULL. This allows
612 // other code to assume ownership of that memory simply by storing the
613 // pointer elsewhere and then setting 'ptr' to NULL. bdb_free() will then
615 void bdb_free(struct cdbdata *cdb) {
623 void bdb_close_cursor(int cdb) {
624 if (TSD->cursors[cdb] != NULL) {
625 bdb_cclose(TSD->cursors[cdb]);
628 TSD->cursors[cdb] = NULL;
632 // Prepare for a sequential search of an entire database.
633 // (There is guaranteed to be no more than one traversal in
634 // progress per thread at any given time.)
635 void bdb_rewind(int cdb) {
638 if (TSD->cursors[cdb] != NULL) {
639 syslog(LOG_ERR, "bdb: bdb_rewind: must close cursor on database %d before reopening", cdb);
641 // bdb_cclose(TSD->cursors[cdb]);
644 // Now initialize the cursor
645 ret = dbp[cdb]->cursor(dbp[cdb], TSD->tid, &TSD->cursors[cdb], 0);
647 syslog(LOG_ERR, "bdb: bdb_rewind: db_cursor: %s", db_strerror(ret));
653 // Fetch the next item in a sequential search. Returns a pointer to a
654 // cdbdata structure, or NULL if we've hit the end.
655 struct cdbdata *bdb_next_item(int cdb) {
657 struct cdbdata *cdbret;
660 // Initialize the key/data pair so the flags aren't set.
661 memset(&key, 0, sizeof(key));
662 memset(&data, 0, sizeof(data));
663 data.flags = DB_DBT_MALLOC;
665 ret = TSD->cursors[cdb]->c_get(TSD->cursors[cdb], &key, &data, DB_NEXT);
668 if (ret != DB_NOTFOUND) {
669 syslog(LOG_ERR, "bdb: bdb_next_item(%d): %s", cdb, db_strerror(ret));
672 bdb_close_cursor(cdb);
673 return NULL; // presumably, end of file
676 cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
677 cdbret->len = data.size;
678 cdbret->ptr = data.data;
679 bdb_decompress_if_necessary(cdbret);
685 // Transaction-based stuff. I'm writing this as I bake cookies...
686 void bdb_begin_transaction(void) {
687 bdb_bailIfCursor(TSD->cursors, "can't begin transaction during r/o cursor");
689 if (TSD->tid != NULL) {
690 syslog(LOG_ERR, "bdb: bdb_begin_transaction: ERROR: nested transaction");
694 bdb_txbegin(&TSD->tid);
698 void bdb_end_transaction(void) {
701 for (i = 0; i < MAXCDB; i++) {
702 if (TSD->cursors[i] != NULL) {
703 syslog(LOG_WARNING, "bdb: bdb_end_transaction: WARNING: cursor %d still open at transaction end", i);
704 bdb_cclose(TSD->cursors[i]);
705 TSD->cursors[i] = NULL;
709 if (TSD->tid == NULL) {
710 syslog(LOG_ERR, "bdb: bdb_end_transaction: ERROR: bdb_txcommit(NULL) !!");
714 bdb_txcommit(TSD->tid);
721 // Truncate (delete every record)
722 void bdb_trunc(int cdb) {
726 if (TSD->tid != NULL) {
727 syslog(LOG_ERR, "bdb: bdb_trunc must not be called in a transaction.");
731 bdb_bailIfCursor(TSD->cursors, "attempt to write during r/o cursor");
735 if ((ret = dbp[cdb]->truncate(dbp[cdb], // db
736 NULL, // transaction ID
737 &count, // #rows deleted
739 if (ret == DB_LOCK_DEADLOCK) {
743 syslog(LOG_ERR, "bdb: bdb_truncate(%d): %s", cdb, db_strerror(ret));
745 syslog(LOG_ERR, "bdb: You may need to tune your database; please read http://www.citadel.org for more information.");
754 // compact (defragment) the database, possibly returning space back to the underlying filesystem
755 void bdb_compact(void) {
759 syslog(LOG_DEBUG, "bdb: bdb_compact() started");
760 for (i = 0; i < MAXCDB; i++) {
761 syslog(LOG_DEBUG, "bdb: compacting database %d", i);
762 ret = dbp[i]->compact(dbp[i], NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
764 syslog(LOG_ERR, "bdb: compact: %s", db_strerror(ret));
767 syslog(LOG_DEBUG, "bdb: bdb_compact() finished");
771 // Calling this function activates the Berkeley DB back end.
772 void bdb_init_backend(void) {
773 cdb_compact = bdb_compact;
774 cdb_checkpoint = bdb_checkpoint;
775 cdb_rewind = bdb_rewind;
776 cdb_fetch = bdb_fetch;
777 cdb_open_databases = bdb_open_databases;
778 cdb_close_databases = bdb_close_databases;
779 cdb_store = bdb_store;
780 cdb_delete = bdb_delete;
782 cdb_next_item = bdb_next_item;
783 cdb_close_cursor = bdb_close_cursor;
784 cdb_begin_transaction = bdb_begin_transaction;
785 cdb_end_transaction = bdb_end_transaction;
786 cdb_check_handles = bdb_check_handles;
787 cdb_trunc = bdb_trunc;
788 cdb_chmod_data = bdb_chmod_data;
790 if (pthread_key_create(&bdb_thread_key, NULL) != 0) { // TSD key for this module
791 syslog(LOG_ERR, "pthread_key_create() : %m");
792 exit(CTDLEXIT_THREAD);
795 syslog(LOG_INFO, "db: initialized Berkeley DB backend");