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glibc/db2/db/db.c

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/*-
* 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));
}
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