Update.cvs/libc-ud-970827

1997-08-10 19:17  Philip Blundell  <Philip.Blundell@pobox.com>

	* nss/nss_db/db-XXX.c: Include <db_185.h> not <db.h>.  Somebody
	should update this to use the new db API.
	* nss/nss_db/db-netgrp.c: Likewise.
	* nss/nss_db/db-alias.c: Likewise.
	* db2/Makefile: Makefile for db-2.x in glibc.

1997-08-27 21:20  Ulrich Drepper  <drepper@cygnus.com>

	* csu/Makefile (before-compile): New goal.  Make sure abi-tag.h
	is generated.
	[$(elf)=yes] (asm-CPPFLAGS): Make sure abi-tag.h file can be found.

	* Makeconfig [$(build-omitfp)=yes] (CFLAGS-.o): Add
	-D__USE_STRING_INLINES.
	* string/string.f: Move strnlen optimization after inclusion of
	<bits/string.h>.  Include <bits/string.h> only if __USE_STRING_INLINES
	is defined.
	* sysdeps/generic/memcpy.c: Undef memcpy to allow macro of this name
	in <bits/string.h>.
	* sysdeps/generic/memset.c: Likewise.
	* sysdeps/i386/string.h: i386 optimized string functions.
	* sysdeps/i386/i486string.h: i486+ optimized string functions.

	* Makefile (subdirs): Change db to db2.
	* shlib-versions: Bump libdb verion number to 3.
	* include/db.h: Include from db2 directory.
	* include/db_185.h: New file.
	* sysdeps/i386/Makefile [$(subdirs)=db2] (CPPFLAGS): Add macros
	to provide spinlock information for db2.
	* sysdeps/m68k/m68020/Makefile: New file.  Likewise.
	* sysdeps/sparc/Makefile: New file.  Likewise.
	* sysdeps/unix/sysv/linux/Makefile [$(subdirs)=db2] (CPPFLAGS):
	Add -DHAVE_LLSEEK.
	* db2/config.h: Hand-edited config file for db2 in glibc.
	* db2/compat.h: New file from db-2.3.4.
	* db2/db.h: Likewise.
	* db2/db_185.h: Likewise.
	* db2/db_int.h: Likewise.
	* db2/makedb.c: Likewise.
	* db2/btree/bt_close.c: Likewise.
	* db2/btree/bt_compare.c: Likewise.
	* db2/btree/bt_conv.c: Likewise.
	* db2/btree/bt_cursor.c: Likewise.
	* db2/btree/bt_delete.c: Likewise.
	* db2/btree/bt_open.c: Likewise.
	* db2/btree/bt_page.c: Likewise.
	* db2/btree/bt_put.c: Likewise.
	* db2/btree/bt_rec.c: Likewise.
	* db2/btree/bt_recno.c: Likewise.
	* db2/btree/btree_auto.c: Likewise.
	* db2/btree/bt_rsearch.c: Likewise.
	* db2/btree/bt_search.c: Likewise.
	* db2/btree/bt_split.c: Likewise.
	* db2/btree/bt_stat.c: Likewise.
	* db2/btree/btree.src: Likewise.
	* db2/common/db_appinit.c: Likewise.
	* db2/common/db_err.c: Likewise.
	* db2/common/db_byteorder.c: Likewise.
	* db2/common/db_apprec.c: Likewise.
	* db2/common/db_salloc.c: Likewise.
	* db2/common/db_log2.c: Likewise.
	* db2/common/db_region.c: Likewise.
	* db2/common/db_shash.c: Likewise.
	* db2/db/db.c: Likewise.
	* db2/db/db.src: Likewise.
	* db2/db/db_conv.c: Likewise.
	* db2/db/db_dispatch.c: Likewise.
	* db2/db/db_dup.c: Likewise.
	* db2/db/db_overflow.c: Likewise.
	* db2/db/db_pr.c: Likewise.
	* db2/db/db_rec.c: Likewise.
	* db2/db/db_ret.c: Likewise.
	* db2/db/db_thread.c: Likewise.
	* db2/db/db_auto.c: Likewise.
	* db2/db185/db185.c: Likewise.
	* db2/db185/db185_int.h: Likewise.
	* db2/dbm/dbm.c: Likewise.
	* db2/hash/hash.c: Likewise.
	* db2/hash/hash.src: Likewise.
	* db2/hash/hash_page.c: Likewise.
	* db2/hash/hash_conv.c: Likewise.
	* db2/hash/hash_debug.c: Likewise.
	* db2/hash/hash_stat.c: Likewise.
	* db2/hash/hash_rec.c: Likewise.
	* db2/hash/hash_dup.c: Likewise.
	* db2/hash/hash_func.c: Likewise.
	* db2/hash/hash_auto.c: Likewise.
	* db2/include/mp.h: Likewise.
	* db2/include/btree.h: Likewise.
	* db2/include/db.h.src: Likewise.
	* db2/include/db_int.h.src: Likewise.
	* db2/include/db_shash.h: Likewise.
	* db2/include/db_swap.h: Likewise.
	* db2/include/db_185.h.src: Likewise.
	* db2/include/txn.h: Likewise.
	* db2/include/db_am.h: Likewise.
	* db2/include/shqueue.h: Likewise.
	* db2/include/hash.h: Likewise.
	* db2/include/db_dispatch.h: Likewise.
	* db2/include/lock.h: Likewise.
	* db2/include/db_page.h: Likewise.
	* db2/include/log.h: Likewise.
	* db2/include/db_auto.h: Likewise.
	* db2/include/btree_auto.h: Likewise.
	* db2/include/hash_auto.h: Likewise.
	* db2/include/log_auto.h: Likewise.
	* db2/include/txn_auto.h: Likewise.
	* db2/include/db_ext.h: Likewise.
	* db2/include/btree_ext.h: Likewise.
	* db2/include/clib_ext.h: Likewise.
	* db2/include/common_ext.h: Likewise.
	* db2/include/hash_ext.h: Likewise.
	* db2/include/lock_ext.h: Likewise.
	* db2/include/log_ext.h: Likewise.
	* db2/include/mp_ext.h: Likewise.
	* db2/include/mutex_ext.h: Likewise.
	* db2/include/os_ext.h: Likewise.
	* db2/include/txn_ext.h: Likewise.
	* db2/include/cxx_int.h: Likewise.
	* db2/include/db_cxx.h: Likewise.
	* db2/include/queue.h: Likewise.
	* db2/lock/lock.c: Likewise.
	* db2/lock/lock_conflict.c: Likewise.
	* db2/lock/lock_util.c: Likewise.
	* db2/lock/lock_deadlock.c: Likewise.
	* db2/log/log.c: Likewise.
	* db2/log/log_get.c: Likewise.
	* db2/log/log.src: Likewise.
	* db2/log/log_compare.c: Likewise.
	* db2/log/log_put.c: Likewise.
	* db2/log/log_rec.c: Likewise.
	* db2/log/log_archive.c: Likewise.
	* db2/log/log_register.c: Likewise.
	* db2/log/log_auto.c: Likewise.
	* db2/log/log_findckp.c: Likewise.
	* db2/mp/mp_bh.c: Likewise.
	* db2/mp/mp_fget.c: Likewise.
	* db2/mp/mp_fopen.c: Likewise.
	* db2/mp/mp_fput.c: Likewise.
	* db2/mp/mp_fset.c: Likewise.
	* db2/mp/mp_open.c: Likewise.
	* db2/mp/mp_region.c: Likewise.
	* db2/mp/mp_pr.c: Likewise.
	* db2/mp/mp_sync.c: Likewise.
	* db2/mutex/68020.gcc: Likewise.
	* db2/mutex/mutex.c: Likewise.
	* db2/mutex/README: Likewise.
	* db2/mutex/x86.gcc: Likewise.
	* db2/mutex/sparc.gcc: Likewise.
	* db2/mutex/uts4.cc.s: Likewise.
	* db2/mutex/alpha.dec: Likewise.
	* db2/mutex/alpha.gcc: Likewise.
	* db2/mutex/parisc.gcc: Likewise.
	* db2/mutex/parisc.hp: Likewise.
	* db2/os/db_os_abs.c: Likewise.
	* db2/os/db_os_dir.c: Likewise.
	* db2/os/db_os_fid.c: Likewise.
	* db2/os/db_os_lseek.c: Likewise.
	* db2/os/db_os_mmap.c: Likewise.
	* db2/os/db_os_open.c: Likewise.
	* db2/os/db_os_rw.c: Likewise.
	* db2/os/db_os_sleep.c: Likewise.
	* db2/os/db_os_stat.c: Likewise.
	* db2/os/db_os_unlink.c: Likewise.
	* db2/txn/txn.c: Likewise.
	* db2/txn/txn.src: Likewise.
	* db2/txn/txn_rec.c: Likewise.
	* db2/txn/txn_auto.c: Likewise.
	* db2/clib/getlong.c: Likewise.
	* db2/progs/db_archive/db_archive.c: Likewise.
	* db2/progs/db_checkpoint/db_checkpoint.c: Likewise.
	* db2/progs/db_deadlock/db_deadlock.c: Likewise.
	* db2/progs/db_dump/db_dump.c: Likewise.
	* db2/progs/db_dump185/db_dump185.c: Likewise.
	* db2/progs/db_load/db_load.c: Likewise.
	* db2/progs/db_printlog/db_printlog.c: Likewise.
	* db2/progs/db_recover/db_recover.c: Likewise.
	* db2/progs/db_stat/db_stat.c: Likewise.

	* libio/stdio.h [__cplusplus] (__STDIO_INLINE): Define as inline.

	* po/de.po, po/sv.po: Update from 2.0.5 translations.

	* sysdeps/unix/sysv/linux/netinet/tcp.h: Pretty print.

	* sunrpc/rpc/xdr.h (XDR): Don't define argument of x_destroy callback
	as const.
	* sunrpc/xdr_mem.c (xdrmem_destroy): Don't define argument as const.
	* sunrpx/xdr_rec.c (xdrrec_destroy): Likewise.
	* sunrpx/xdr_stdio.c (xdrstdio_destroy): Likewise.

1997-08-27 18:47  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/if_index.c: Include <errno.h>.
	Reported by Benjamin Kosnik <bkoz@cygnus.com>.

1997-08-27 02:27  Roland McGrath  <roland@baalperazim.frob.com>

	* abi-tags: New file.
	* csu/Makefile (distribute): Remove abi-tag.h.
	($(objpfx)abi-tag.h): New target.
	* Makefile (distribute): Add abi-tags.
	* sysdeps/unix/sysv/linux/abi-tag.h: File removed.
	* sysdeps/mach/hurd/abi-tag.h: File removed.
	* sysdeps/stub/abi-tag.h: File removed.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/make-syscalls.sh: Change output so that it
	generates compilation rules only for the currently selected object
	suffixes.

1997-08-25  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/m68k/dl-machine.h (RTLD_START): Switch back to previous
	section to avoid confusing the compiler.
	* sysdeps/alpha/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/i386/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/mips/mips64/dl-machine.h (RTLD_START): Likewise.
	* sysdeps/sparc/sparc32/dl-machine.h (RTLD_START): Likewise.

	* sysdeps/m68k/dl-machine.h (elf_machine_load_address): Use a GOT
	relocation instead of a constant to avoid text relocation.
	(ELF_MACHINE_BEFORE_RTLD_RELOC): Removed.
	(RTLD_START): Declare global labels as functions and add size
	directive.

1997-08-25 17:01  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/i386/bits/select.h: Correct assembler versions to work even
	for descriptors >= 32.

	* stdlib/alloca.h: Don't define alloca to __alloca since if gcc
	is used __alloca is not defined to __builtin_alloca and so might
	not be available.
	Reported by Uwe Ohse <uwe@ohse.de>.

	* sysdeps/unix/sysv/linux/sys/sysmacros.h: Define macros in a special
	way if gcc is not used and so dev_t is an array.
	Reported by Uwe Ohse <uwe@ohse.de>.

1997-08-23  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* manual/libc.texinfo: Reorder chapters to match logical order.

1997-08-25 12:22  Ulrich Drepper  <drepper@cygnus.com>

	* sunrpc/rpc/xdr.h: Change name of parameters in prototypes of
	xdr_reference, xdrmem_create, and xdrstdio_create because of clash
	with g++ internal symbols.
	Patch by Sudish Joseph <sj@eng.mindspring.net>.

	* elf/dl-deps.c: Implement handling of DT_FILTER.

11 files changed, 5668 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,