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-rw-r--r--db2/db/db.c818
1 files changed, 818 insertions, 0 deletions
diff --git a/db2/db/db.c b/db2/db/db.c
new file mode 100644
index 0000000000..df3a9d2d21
--- /dev/null
+++ b/db2/db/db.c
@@ -0,0 +1,818 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ * Sleepycat Software. All rights reserved.
+ */
+/*
+ * Copyright (c) 1990, 1993, 1994, 1995, 1996
+ * Keith Bostic. All rights reserved.
+ */
+/*
+ * Copyright (c) 1990, 1993, 1994, 1995
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)db.c 10.37 (Sleepycat) 8/23/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include "db_int.h"
+#include "shqueue.h"
+#include "db_page.h"
+#include "db_shash.h"
+#include "db_swap.h"
+#include "btree.h"
+#include "hash.h"
+#include "mp.h"
+#include "db_am.h"
+#include "common_ext.h"
+
+static int db_close __P((DB *, int));
+static int db_fd __P((DB *, int *));
+
+/*
+ * If the metadata page has the flag set, set the local flag. If the page
+ * does NOT have the flag set, return EINVAL if the user's dbinfo argument
+ * caused us to already set the local flag.
+ */
+#define DBINFO_FCHK(dbp, fn, meta_flags, m_name, dbp_name) { \
+ if ((meta_flags) & (m_name)) \
+ F_SET(dbp, dbp_name); \
+ else \
+ if (F_ISSET(dbp, dbp_name)) { \
+ __db_err(dbenv, \
+ "%s: %s specified in dbinfo argument but not set in file", \
+ fname, fn); \
+ goto einval; \
+ } \
+}
+
+/*
+ * db_open --
+ * Main library interface to the DB access methods.
+ */
+int
+db_open(fname, type, flags, mode, dbenv, dbinfo, dbpp)
+ const char *fname;
+ DBTYPE type;
+ int flags, mode;
+ DB_ENV *dbenv;
+ DB_INFO *dbinfo;
+ DB **dbpp;
+{
+ BTMETA *btm;
+ DB *dbp;
+ DBT pgcookie;
+ DB_ENV *envp, t_dbenv;
+ DB_PGINFO pginfo;
+ HASHHDR *hashm;
+ off_t io;
+ size_t cachesize;
+ ssize_t nr;
+ int fd, ftype, need_fileid, restore, ret, retry_cnt, swapped;
+ char *real_name, mbuf[512];
+
+ /* Validate arguments. */
+#ifdef HAVE_SPINLOCKS
+#define OKFLAGS (DB_CREATE | DB_NOMMAP | DB_RDONLY | DB_THREAD | DB_TRUNCATE)
+#else
+#define OKFLAGS (DB_CREATE | DB_NOMMAP | DB_RDONLY | DB_TRUNCATE)
+#endif
+ if ((ret = __db_fchk(dbenv, "db_open", flags, OKFLAGS)) != 0)
+ return (ret);
+
+ /* Initialize for error return. */
+ fd = -1;
+ need_fileid = 1;
+ real_name = NULL;
+
+ /* Allocate the DB structure, reference the DB_ENV structure. */
+ if ((dbp = (DB *)calloc(1, sizeof(DB))) == NULL) {
+ __db_err(dbenv, "%s", strerror(ENOMEM));
+ return (ENOMEM);
+ }
+ dbp->dbenv = dbenv;
+
+ /* Convert the dbinfo flags. */
+ if (dbinfo != NULL) {
+ /*
+ * !!!
+ * We can't check for illegal flags until we know what type
+ * of open we're doing.
+ */
+ if (F_ISSET(dbinfo, DB_DELIMITER))
+ F_SET(dbp, DB_RE_DELIMITER);
+ if (F_ISSET(dbinfo, DB_DUP))
+ F_SET(dbp, DB_AM_DUP);
+ if (F_ISSET(dbinfo, DB_FIXEDLEN))
+ F_SET(dbp, DB_RE_FIXEDLEN);
+ if (F_ISSET(dbinfo, DB_PAD))
+ F_SET(dbp, DB_RE_PAD);
+ if (F_ISSET(dbinfo, DB_RECNUM))
+ F_SET(dbp, DB_BT_RECNUM);
+ if (F_ISSET(dbinfo, DB_RENUMBER))
+ F_SET(dbp, DB_RE_RENUMBER);
+ if (F_ISSET(dbinfo, DB_SNAPSHOT))
+ F_SET(dbp, DB_RE_SNAPSHOT);
+ }
+
+ /* Set based on the open(2) flags. */
+ if (LF_ISSET(DB_RDONLY))
+ F_SET(dbp, DB_AM_RDONLY);
+
+ /* Check threading fields. */
+ if (LF_ISSET(DB_THREAD)) {
+ if ((dbp->mutex =
+ (db_mutex_t *)malloc(sizeof(db_mutex_t))) == NULL) {
+ __db_err(dbenv, "%s", strerror(ENOMEM));
+ ret = ENOMEM;
+ goto err;
+ }
+ __db_mutex_init(dbp->mutex, 0);
+
+ F_SET(dbp, DB_AM_THREAD);
+ }
+
+ /*
+ * Always set the master and initialize the queues, so we can
+ * use these fields without checking the thread bit.
+ */
+ dbp->master = dbp;
+ LIST_INIT(&dbp->handleq);
+ LIST_INSERT_HEAD(&dbp->handleq, dbp, links);
+ TAILQ_INIT(&dbp->curs_queue);
+
+ /*
+ * Set based on the dbenv fields, although no logging or transactions
+ * are possible for temporary files.
+ */
+ if (dbp->dbenv != NULL) {
+ if (dbenv->lk_info != NULL)
+ F_SET(dbp, DB_AM_LOCKING);
+ if (fname != NULL && dbenv->lg_info != NULL)
+ F_SET(dbp, DB_AM_LOGGING);
+ }
+
+ /* Set the common fields. */
+ if (dbinfo == NULL) {
+ dbp->pgsize = 0;
+ dbp->db_malloc = NULL;
+ } else {
+ dbp->pgsize = dbinfo->db_pagesize;
+ dbp->db_malloc = dbinfo->db_malloc;
+ }
+
+ /* Fill in the default file mode. */
+ if (mode == 0)
+ mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
+
+ /* Check if the user wants us to swap byte order. */
+ if (dbinfo != NULL)
+ switch (ret = __db_byteorder(dbenv, dbinfo->db_lorder)) {
+ case 0:
+ break;
+ case DB_SWAPBYTES:
+ F_SET(dbp, DB_AM_SWAP);
+ break;
+ default:
+ goto err;
+ }
+
+ /*
+ * If we have a file name, try and read the first page, figure out
+ * what type of file it is, and initialize everything we can based
+ * on that file's meta-data page.
+ *
+ * XXX
+ * We don't actually expect zero-length strings as arguments. We
+ * do the check, permitting them, because scripting languages, e.g.,
+ * the Tcl test suite, doesn't know anything about passing NULL's.
+ */
+ if (fname != NULL && fname[0] != '\0') {
+ /* Get the real file name. */
+ if ((ret = __db_appname(dbenv,
+ DB_APP_DATA, NULL, fname, NULL, &real_name)) != 0)
+ goto err;
+
+ /*
+ * Open the backing file. We need to make sure that multiple
+ * processes attempting to create the file at the same time
+ * are properly ordered so that only one of them creates the
+ * "unique" file id, so we open it O_EXCL and O_CREAT so two
+ * simultaneous attempts to create the region will return
+ * failure in one of the attempts. If we're one of the ones
+ * that fail, we simply retry without the O_CREAT flag, which
+ * will require that the meta-data page exist.
+ */
+#undef OKFLAGS
+#define OKFLAGS \
+ DB_CREATE | DB_NOMMAP | DB_RDONLY | DB_THREAD | DB_TRUNCATE
+ retry_cnt = 0;
+open_retry: if (LF_ISSET(DB_CREATE)) {
+ if ((ret = __db_fdopen(real_name, flags | DB_EXCL,
+ OKFLAGS | DB_EXCL, mode, &fd)) != 0)
+ if (ret == EEXIST) {
+ LF_CLR(DB_CREATE);
+ goto open_retry;
+ } else {
+ __db_err(dbenv,
+ "%s: %s", fname, strerror(ret));
+ goto err;
+ }
+ } else
+ if ((ret = __db_fdopen(real_name,
+ flags, OKFLAGS, mode, &fd)) != 0) {
+ __db_err(dbenv, "%s: %s", fname, strerror(ret));
+ goto err;
+ }
+
+ /*
+ * Use the optimum I/O size as the pagesize if a pagesize not
+ * specified. Some filesystems have 64K as their optimum I/O
+ * size, but as that results in impossibly large default cache
+ * sizes, we limit the default pagesize to 16K.
+ */
+ if (dbp->pgsize == 0) {
+ if ((ret = __db_stat(dbp->dbenv,
+ real_name, fd, NULL, &io)) != 0)
+ goto err;
+ if (io < 512)
+ io = 512;
+ if (io > 16 * 1024)
+ io = 16 * 1024;
+ dbp->pgsize = io;
+ F_SET(dbp, DB_AM_PGDEF);
+ }
+
+ /*
+ * Try and read the first disk sector -- this code assumes
+ * that the meta-data for all access methods fits in 512
+ * bytes, and that no database will be smaller than that.
+ */
+ if ((ret = __db_read(fd, mbuf, sizeof(mbuf), &nr)) != 0)
+ goto err;
+
+ /* The fd is no longer needed. */
+ (void)__db_close(fd);
+ fd = -1;
+
+ if (nr != sizeof(mbuf)) {
+ if (nr != 0) {
+ __db_err(dbenv,
+ "%s: unexpected file format", fname);
+ goto einval;
+ }
+ /*
+ * The only way we can reach here with the DB_CREATE
+ * flag set is if we created the file. If we didn't
+ * create the file, there's a chance that someone else
+ * is busily doing so. Sleep and give them a chance,
+ * because we need the metadata page their going to
+ * write.
+ */
+ if (!LF_ISSET(DB_CREATE) && retry_cnt++ < 3) {
+ __db_sleep(1, 0);
+ goto open_retry;
+ }
+ if (type == DB_UNKNOWN) {
+ __db_err(dbenv,
+ "%s: DBTYPE of unknown with empty file",
+ fname);
+ goto einval;
+ }
+ goto empty;
+ }
+
+ /*
+ * A found file overrides some user information. We'll check
+ * for possible error conditions based on conflicts between
+ * the file and the user's arguments below.
+ */
+ swapped = 0;
+ F_CLR(dbp, DB_AM_SWAP);
+
+retry: switch (((BTMETA *)mbuf)->magic) {
+ case DB_BTREEMAGIC:
+ if (type != DB_BTREE &&
+ type != DB_RECNO && type != DB_UNKNOWN)
+ goto einval;
+
+ btm = (BTMETA *)mbuf;
+ if (swapped && (ret = __bam_mswap((PAGE *)btm)) != 0)
+ goto err;
+
+ if (btm->version < DB_BTREEOLDVER ||
+ btm->version > DB_BTREEVERSION) {
+ __db_err(dbenv,
+ "%s: unsupported btree version number %lu",
+ fname, (u_long)btm->version);
+ goto einval;
+ }
+ dbp->pgsize = btm->pagesize;
+ F_CLR(dbp, DB_AM_PGDEF);
+
+ if ((ret = __db_fchk(dbenv,
+ "db_open", btm->flags, BTM_MASK)) != 0)
+ goto err;
+ DBINFO_FCHK(dbp, "DB_DUP",
+ btm->flags, BTM_DUP, DB_AM_DUP);
+ if (F_ISSET(btm, BTM_RECNO)) {
+ DBINFO_FCHK(dbp, "DB_FIXEDLEN",
+ btm->flags, BTM_FIXEDLEN, DB_RE_FIXEDLEN);
+ DBINFO_FCHK(dbp, "DB_RENUMBER",
+ btm->flags, BTM_RENUMBER, DB_RE_RENUMBER);
+ type = DB_RECNO;
+ } else {
+ DBINFO_FCHK(dbp, "DB_RECNUM",
+ btm->flags, BTM_RECNUM, DB_BT_RECNUM);
+ type = DB_BTREE;
+ }
+
+ /* Copy the file's unique id. */
+ need_fileid = 0;
+ memcpy(dbp->lock.fileid, btm->uid, DB_FILE_ID_LEN);
+ break;
+ case DB_HASHMAGIC:
+ if (type != DB_HASH && type != DB_UNKNOWN)
+ goto einval;
+
+ hashm = (HASHHDR *)mbuf;
+ if (swapped && (ret = __ham_mswap((PAGE *)hashm)) != 0)
+ goto err;
+
+ if (hashm->version < DB_HASHOLDVER ||
+ hashm->version > DB_HASHVERSION) {
+ __db_err(dbenv,
+ "%s: unsupported hash version number %lu",
+ fname, hashm->version);
+ goto einval;
+ }
+ dbp->pgsize = hashm->pagesize;
+ F_CLR(dbp, DB_AM_PGDEF);
+
+ if ((ret = __db_fchk(dbenv,
+ "db_open", hashm->flags, DB_HASH_DUP)) != 0)
+ goto err;
+ DBINFO_FCHK(dbp, "DB_DUP",
+ hashm->flags, DB_HASH_DUP, DB_AM_DUP);
+ type = DB_HASH;
+
+ /* Copy the file's unique id. */
+ need_fileid = 0;
+ memcpy(dbp->lock.fileid, hashm->uid, DB_FILE_ID_LEN);
+ break;
+ default:
+ if (swapped) {
+ __db_err(dbenv, "unrecognized file type");
+ goto einval;
+ }
+ M_32_SWAP(((BTMETA *)mbuf)->magic);
+ F_SET(dbp, DB_AM_SWAP);
+
+ swapped = 1;
+ goto retry;
+ }
+ } else {
+ fname = real_name = NULL;
+
+ if (type == DB_UNKNOWN) {
+ __db_err(dbenv,
+ "DBTYPE of unknown without existing file");
+ goto einval;
+ }
+ F_SET(dbp, DB_AM_INMEM);
+ }
+
+empty: /*
+ * By the time we get here we've either set the type or we're taking
+ * it from the user.
+ */
+ dbp->type = type;
+
+ /*
+ * Set the page size to the best value for I/O to this file. Don't
+ * overflow the page offset type. The page size must be db_indx_t
+ * aligned and >= MIN_PAGE_SIZE.
+ *
+ * XXX
+ * Should we be checking for a page size that's not a multiple of 512?
+ */
+ if (dbp->pgsize == 0) {
+ F_SET(dbp, DB_AM_PGDEF);
+ dbp->pgsize = 8 * 1024;
+ }
+ if (dbp->pgsize < DB_MIN_PGSIZE ||
+ dbp->pgsize > DB_MAX_PGSIZE ||
+ dbp->pgsize & (sizeof(db_indx_t) - 1)) {
+ __db_err(dbenv, "illegal page size");
+ goto einval;
+ }
+
+ /*
+ * Set and/or correct the cache size; must be a multiple of the
+ * page size.
+ */
+ if (dbinfo == NULL || dbinfo->db_cachesize == 0)
+ cachesize = dbp->pgsize * DB_MINCACHE;
+ else {
+ cachesize = dbinfo->db_cachesize;
+ if (cachesize & (dbp->pgsize - 1))
+ cachesize += (~cachesize & (dbp->pgsize - 1)) + 1;
+ if (cachesize < dbp->pgsize * DB_MINCACHE)
+ cachesize = dbp->pgsize * DB_MINCACHE;
+ if (cachesize < 20 * 1024)
+ cachesize = 20 * 1024;
+ }
+
+ /*
+ * If no mpool supplied by the application, attach to a local,
+ * created buffer pool.
+ *
+ * XXX
+ * If the user has a DB_ENV structure, we have to use a temporary
+ * one so that we don't step on their values. If the user doesn't,
+ * we have to create one, and keep it around until the call to the
+ * memp_close() function. This is all so the mpool functions get
+ * the error stuff right.
+ */
+ if (dbenv == NULL || dbenv->mp_info == NULL) {
+ F_SET(dbp, DB_AM_MLOCAL);
+
+ if (dbenv == NULL) {
+ if ((dbp->mp_dbenv =
+ (DB_ENV *)calloc(sizeof(DB_ENV), 1)) == NULL) {
+ ret = ENOMEM;
+ goto err;
+ }
+
+ envp = dbp->mp_dbenv;
+ restore = 0;
+ } else {
+ t_dbenv = *dbenv;
+
+ envp = dbenv;
+ restore = 1;
+ }
+ envp->mp_size = cachesize;
+ F_SET(envp, DB_MPOOL_PRIVATE);
+ if ((ret = memp_open(NULL,
+ DB_CREATE, S_IRUSR | S_IWUSR, envp, &dbp->mp)) != 0)
+ goto err;
+ if (restore)
+ *dbenv = t_dbenv;
+ } else
+ dbp->mp = dbenv->mp_info;
+
+ /* Register DB's pgin/pgout functions. */
+ if ((ret = memp_register(dbp->mp,
+ DB_FTYPE_BTREE, __bam_pgin, __bam_pgout)) != 0)
+ goto err;
+ if ((ret = memp_register(dbp->mp,
+ DB_FTYPE_HASH, __ham_pgin, __ham_pgout)) != 0)
+ goto err;
+
+ /*
+ * If we don't already have one, get a unique file ID. If the file
+ * is a temporary file, then we have to create a unique file ID --
+ * no backing file will be created until the mpool cache is filled
+ * forcing it to go to disk. The created ID must never match any
+ * potential real file ID -- we know it won't because real file IDs
+ * contain a time stamp after the dev/ino pair, and we're simply
+ * storing a 4-byte locker ID.
+ *
+ * XXX
+ * Store the file id in the locker structure -- we can get it from
+ * there as necessary, and it saves having two copies.
+ */
+ if (need_fileid)
+ if (fname == NULL) {
+ memset(dbp->lock.fileid, 0, DB_FILE_ID_LEN);
+ if (F_ISSET(dbp, DB_AM_LOCKING) &&
+ (ret = lock_id(dbenv->lk_info,
+ (u_int32_t *)dbp->lock.fileid)) != 0)
+ goto err;
+ } else
+ if ((ret = __db_fileid(dbenv,
+ real_name, 1, dbp->lock.fileid)) != 0)
+ goto err;
+
+ /* No further use for the real name. */
+ if (real_name != NULL)
+ FREES(real_name);
+ real_name = NULL;
+
+ /*
+ * Open a backing file in the memory pool.
+ *
+ * If we need to process the file's pages on I/O, set the file type.
+ * If it's a hash file, always call pgin and pgout routines. This
+ * means that hash files can never be mapped into process memory. If
+ * it's a btree file and requires swapping, we need to page the file
+ * in and out. This has to be right -- we can't mmap files that are
+ * being paged in and out.
+ */
+ if (type == DB_HASH)
+ ftype = DB_FTYPE_HASH;
+ else
+ ftype = F_ISSET(dbp, DB_AM_SWAP) ? DB_FTYPE_BTREE : 0;
+ pginfo.db_pagesize = dbp->pgsize;
+ pginfo.needswap = F_ISSET(dbp, DB_AM_SWAP);
+ pgcookie.data = &pginfo;
+ pgcookie.size = sizeof(DB_PGINFO);
+
+ if ((ret = memp_fopen(dbp->mp, fname, ftype,
+ F_ISSET(dbp, DB_AM_RDONLY) ? DB_RDONLY : 0, 0, dbp->pgsize,
+ 0, &pgcookie, dbp->lock.fileid, &dbp->mpf)) != 0)
+ goto err;
+
+ /* Get a log file id. */
+ if (F_ISSET(dbp, DB_AM_LOGGING) &&
+ (ret = log_register(dbenv->lg_info,
+ dbp, fname, type, &dbp->log_fileid)) != 0)
+ goto err;
+
+ /*
+ * Get a locker id for this DB, and build the lock cookie: the first
+ * db_pgno_t bytes are the page number, the next N bytes are the file
+ * id.
+ */
+ if (F_ISSET(dbp, DB_AM_LOCKING)) {
+ if ((ret = lock_id(dbenv->lk_info, &dbp->locker)) != 0)
+ goto err;
+ dbp->lock_dbt.size = sizeof(dbp->lock);
+ dbp->lock_dbt.data = &dbp->lock;
+ }
+
+ /* Call the real open function. */
+ switch (type) {
+ case DB_BTREE:
+ if (dbinfo != NULL && (ret = __db_fchk(dbenv,
+ "db_open", dbinfo->flags, DB_RECNUM | DB_DUP)) != 0)
+ goto err;
+ if (dbinfo != NULL && (ret = __db_fcchk(dbenv,
+ "db_open", dbinfo->flags, DB_DUP, DB_RECNUM)) != 0)
+ goto err;
+ if ((ret = __bam_open(dbp, type, dbinfo)) != 0)
+ goto err;
+ break;
+ case DB_HASH:
+ if (dbinfo != NULL && (ret = __db_fchk(dbenv,
+ "db_open", dbinfo->flags, DB_DUP)) != 0)
+ goto err;
+ if ((ret = __ham_open(dbp, dbinfo)) != 0)
+ goto err;
+ break;
+ case DB_RECNO:
+#define DB_INFO_FLAGS \
+ (DB_DELIMITER | DB_FIXEDLEN | DB_PAD | DB_RENUMBER | DB_SNAPSHOT)
+ if (dbinfo != NULL && (ret = __db_fchk(dbenv,
+ "db_open", dbinfo->flags, DB_INFO_FLAGS)) != 0)
+ goto err;
+ if ((ret = __ram_open(dbp, type, dbinfo)) != 0)
+ goto err;
+ break;
+ default:
+ abort();
+ }
+
+ /* Call a local close routine. */
+ dbp->close = db_close;
+ dbp->fd = db_fd;
+
+ *dbpp = dbp;
+ return (0);
+
+einval: ret = EINVAL;
+err: /* Close the file descriptor. */
+ if (fd != -1)
+ (void)__db_close(fd);
+
+ /* Discard the log file id. */
+ if (dbp->log_fileid != 0)
+ (void)log_unregister(dbenv->lg_info, dbp->log_fileid);
+
+ /* Close the memory pool file. */
+ if (dbp->mpf != NULL)
+ (void)memp_fclose(dbp->mpf);
+
+ /* If the memory pool was local, close it. */
+ if (F_ISSET(dbp, DB_AM_MLOCAL) && dbp->mp != NULL)
+ (void)memp_close(dbp->mp);
+
+ /* If we allocated a DB_ENV, discard it. */
+ if (dbp->mp_dbenv != NULL)
+ FREE(dbp->mp_dbenv, sizeof(DB_ENV));
+
+ if (real_name != NULL)
+ FREES(real_name);
+ if (dbp != NULL)
+ FREE(dbp, sizeof(DB));
+
+ return (ret);
+}
+
+/*
+ * db_close --
+ * Close a DB tree.
+ */
+static int
+db_close(dbp, flags)
+ DB *dbp;
+ int flags;
+{
+ DBC *dbc;
+ DB *tdbp;
+ int ret, t_ret;
+
+ ret = 0;
+
+ /* Sync the underlying file. */
+ if (!LF_ISSET(DB_NOSYNC) &&
+ (t_ret = dbp->sync(dbp, 0)) != 0 && ret == 0)
+ ret = t_ret;
+
+ /*
+ * Call the underlying access method close routine for all the
+ * cursors and handles.
+ */
+ for (tdbp = LIST_FIRST(&dbp->handleq);
+ tdbp != NULL; tdbp = LIST_NEXT(tdbp, links)) {
+
+ while ((dbc = TAILQ_FIRST(&tdbp->curs_queue)) != NULL)
+ if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
+ ret = t_ret;
+
+ switch (tdbp->type) {
+ case DB_BTREE:
+ if ((t_ret = __bam_close(tdbp)) != 0 && ret == 0)
+ ret = t_ret;
+ break;
+ case DB_HASH:
+ if ((t_ret = __ham_close(tdbp)) != 0 && ret == 0)
+ ret = t_ret;
+ break;
+ case DB_RECNO:
+ if ((t_ret = __ram_close(tdbp)) != 0 && ret == 0)
+ ret = t_ret;
+ break;
+ default:
+ abort();
+ }
+
+ }
+
+ /* Sync the memory pool. */
+ if ((t_ret = memp_fsync(dbp->mpf)) != 0 && ret == 0)
+ ret = t_ret;
+
+ /* Close the memory pool file. */
+ if ((t_ret = memp_fclose(dbp->mpf)) != 0 && ret == 0)
+ ret = t_ret;
+
+ /* If the memory pool was local, close it. */
+ if (F_ISSET(dbp, DB_AM_MLOCAL) &&
+ (t_ret = memp_close(dbp->mp)) != 0 && ret == 0)
+ ret = t_ret;
+
+ /* Discard the mutex. */
+ if (dbp->mutex != NULL)
+ FREE(dbp->mutex, sizeof(db_mutex_t));
+
+ /* Discard the log file id. */
+ if (F_ISSET(dbp, DB_AM_LOGGING))
+ (void)log_unregister(dbp->dbenv->lg_info, dbp->log_fileid);
+
+ /* Discard the lock cookie for all handles. */
+ for (tdbp = LIST_FIRST(&dbp->handleq);
+ tdbp != NULL; tdbp = LIST_NEXT(tdbp, links))
+ if (F_ISSET(tdbp, DB_AM_LOCKING)) {
+#ifdef DEBUG
+ DB_LOCKREQ request;
+
+ /*
+ * If we're running tests, display any locks currently
+ * held. It's possible that some applications may hold
+ * locks for long periods, e.g., conference room locks,
+ * but the DB tests should never close holding locks.
+ */
+ request.op = DB_LOCK_DUMP;
+ if ((t_ret = lock_vec(tdbp->dbenv->lk_info,
+ tdbp->locker, 0, &request, 1, NULL)) != 0 &&
+ ret == 0)
+ ret = EAGAIN;
+#endif
+ }
+
+ /* If we allocated a DB_ENV, discard it. */
+ if (dbp->mp_dbenv != NULL)
+ FREE(dbp->mp_dbenv, sizeof(DB_ENV));
+
+ /* Free all of the DB's. */
+ LIST_REMOVE(dbp, links);
+ while ((tdbp = LIST_FIRST(&dbp->handleq)) != NULL) {
+ LIST_REMOVE(tdbp, links);
+ FREE(tdbp, sizeof(*tdbp));
+ }
+ FREE(dbp, sizeof(*dbp));
+
+ return (ret);
+}
+
+/*
+ * db_fd --
+ * Return a file descriptor for flock'ing.
+ */
+static int
+db_fd(dbp, fdp)
+ DB *dbp;
+ int *fdp;
+{
+ /* In-memory database can't have a file descriptor. */
+ if (F_ISSET(dbp, DB_AM_INMEM))
+ return (ENOENT);
+
+ /*
+ * XXX
+ * Truly spectacular layering violation. As we don't open the
+ * underlying file until we need it, it may not be initialized.
+ */
+ if ((*fdp = dbp->mpf->fd) == -1)
+ return (ENOENT);
+ return (0);
+}
+
+/*
+ * __db_pgerr --
+ * Error when unable to retrieve a specified page.
+ *
+ * PUBLIC: int __db_pgerr __P((DB *, db_pgno_t));
+ */
+int
+__db_pgerr(dbp, pgno)
+ DB *dbp;
+ db_pgno_t pgno;
+{
+ __db_err(dbp->dbenv,
+ "unable to create/retrieve page %lu", (u_long)pgno);
+ return (__db_panic(dbp));
+}
+
+/*
+ * __db_pgfmt --
+ * Error when a page has the wrong format.
+ *
+ * PUBLIC: int __db_pgfmt __P((DB *, db_pgno_t));
+ */
+int
+__db_pgfmt(dbp, pgno)
+ DB *dbp;
+ db_pgno_t pgno;
+{
+ __db_err(dbp->dbenv,
+ "page %lu: illegal page type or format", (u_long)pgno);
+ return (__db_panic(dbp));
+}