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db_method.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999-2005
 *    Sleepycat Software.  All rights reserved.
 *
 * $Id: db_method.c,v 12.15 2005/11/08 03:24:58 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#ifdef HAVE_RPC
#include <rpc/rpc.h>
#endif

#include <string.h>
#endif

#ifdef HAVE_RPC
#include "db_server.h"
#endif

#include "db_int.h"
#include "dbinc/crypto.h"
#include "dbinc/db_page.h"
#include "dbinc/db_shash.h"
#include "dbinc/btree.h"
#include "dbinc/hash.h"
#include "dbinc/lock.h"
#include "dbinc/mp.h"
#include "dbinc/qam.h"
#include "dbinc/txn.h"

#ifdef HAVE_RPC
#include "dbinc_auto/rpc_client_ext.h"
#endif

static int  __db_get_byteswapped __P((DB *, int *));
static int  __db_get_dbname __P((DB *, const char **, const char **));
static DB_ENV *__db_get_env __P((DB *));
static DB_MPOOLFILE *__db_get_mpf __P((DB *));
static int  __db_get_transactional __P((DB *));
static int  __db_get_type __P((DB *, DBTYPE *dbtype));
static int  __db_init __P((DB_ENV *, DB *, u_int32_t));
static int  __db_set_alloc __P((DB *, void *(*)(size_t),
            void *(*)(void *, size_t), void (*)(void *)));
static int  __db_set_append_recno __P((DB *, int (*)(DB *, DBT *, db_recno_t)));
static int  __db_get_cachesize __P((DB *, u_int32_t *, u_int32_t *, int *));
static int  __db_set_cachesize __P((DB *, u_int32_t, u_int32_t, int));
static int  __db_set_dup_compare
            __P((DB *, int (*)(DB *, const DBT *, const DBT *)));
static int  __db_get_encrypt_flags __P((DB *, u_int32_t *));
static int  __db_set_encrypt __P((DB *, const char *, u_int32_t));
static int  __db_set_feedback __P((DB *, void (*)(DB *, int, int)));
static void __db_map_flags __P((DB *, u_int32_t *, u_int32_t *));
static int  __db_get_pagesize __P((DB *, u_int32_t *));
static int  __db_set_paniccall __P((DB *, void (*)(DB_ENV *, int)));
static void __db_set_errcall
            __P((DB *, void (*)(const DB_ENV *, const char *, const char *)));
static void __db_get_errfile __P((DB *, FILE **));
static void __db_set_errfile __P((DB *, FILE *));
static void __db_get_errpfx __P((DB *, const char **));
static void __db_set_errpfx __P((DB *, const char *));
static void __db_set_msgcall
            __P((DB *, void (*)(const DB_ENV *, const char *)));
static void __db_get_msgfile __P((DB *, FILE **));
static void __db_set_msgfile __P((DB *, FILE *));
static void __dbh_err __P((DB *, int, const char *, ...));
static void __dbh_errx __P((DB *, const char *, ...));

/*
 * db_create --
 *    DB constructor.
 *
 * EXTERN: int db_create __P((DB **, DB_ENV *, u_int32_t));
 */
int
db_create(dbpp, dbenv, flags)
      DB **dbpp;
      DB_ENV *dbenv;
      u_int32_t flags;
{
      DB *dbp;
      DB_THREAD_INFO *ip;
      DB_REP *db_rep;
      int ret;

      /* Check for invalid function flags. */
      switch (flags) {
      case 0:
            break;
      case DB_XA_CREATE:
            if (dbenv != NULL) {
                  __db_err(dbenv,
            "XA applications may not specify an environment to db_create");
                  return (EINVAL);
            }

            /*
             * If it's an XA database, open it within the XA environment,
             * taken from the global list of environments.  (When the XA
             * transaction manager called our xa_start() routine the
             * "current" environment was moved to the start of the list.
             */
            dbenv = TAILQ_FIRST(&DB_GLOBAL(db_envq));
            break;
      default:
            return (__db_ferr(dbenv, "db_create", 0));
      }

      ip = NULL;
      if (dbenv != NULL)
            ENV_ENTER(dbenv, ip);
      /* Allocate the DB. */
      if ((ret = __os_calloc(dbenv, 1, sizeof(*dbp), &dbp)) != 0) {
            if (dbenv != NULL)
                  ENV_LEAVE(dbenv, ip);
            return (ret);
      }

      if ((ret = __db_init(dbenv, dbp, flags)) != 0)
            goto err;

      /* If we don't have an environment yet, allocate a local one. */
      if (dbenv == NULL) {
            if ((ret = db_env_create(&dbenv, 0)) != 0)
                  goto err;
            F_SET(dbenv, DB_ENV_DBLOCAL);
            ENV_ENTER(dbenv, ip);
      }
      dbp->dbenv = dbenv;
      MUTEX_LOCK(dbenv, dbenv->mtx_dblist);
      ++dbenv->db_ref;
      MUTEX_UNLOCK(dbenv, dbenv->mtx_dblist);

      /*
       * Set the replication timestamp; it's 0 if we're not in a replicated
       * environment.  Don't acquire a lock to read the value, even though
       * it's opaque: all we check later is value equality, nothing else.
       */
      dbp->timestamp = REP_ON(dbenv) ?
          ((REGENV *)((REGINFO *)dbenv->reginfo)->primary)->rep_timestamp : 0;
      /*
       * Set the replication generation number for fid management; valid
       * replication generations start at 1.  Don't acquire a lock to
       * read the value.  All we check later is value equality.
       */
      db_rep = dbenv->rep_handle;
      dbp->fid_gen =
          (REP_ON(dbenv) && db_rep->region != NULL) ?
          ((REP *)db_rep->region)->gen : 0;

      /* If not RPC, open a backing DB_MPOOLFILE handle in the memory pool. */
      if (!RPC_ON(dbenv) &&
          (ret = __memp_fcreate(dbenv, &dbp->mpf)) != 0)
            goto err;

      dbp->type = DB_UNKNOWN;

      *dbpp = dbp;
      return (0);

err:  if (dbp->mpf != NULL)
            (void)__memp_fclose(dbp->mpf, 0);
      if (dbenv != NULL && F_ISSET(dbenv, DB_ENV_DBLOCAL))
            (void)__env_close(dbenv, 0);
      __os_free(dbenv, dbp);
      *dbpp = NULL;
      ENV_LEAVE(dbenv, ip);
      return (ret);
}

/*
 * __db_init --
 *    Initialize a DB structure.
 */
static int
__db_init(dbenv, dbp, flags)
      DB_ENV *dbenv;
      DB *dbp;
      u_int32_t flags;
{
      int ret;

      dbp->lid = DB_LOCK_INVALIDID;
      LOCK_INIT(dbp->handle_lock);

      TAILQ_INIT(&dbp->free_queue);
      TAILQ_INIT(&dbp->active_queue);
      TAILQ_INIT(&dbp->join_queue);
      LIST_INIT(&dbp->s_secondaries);

      FLD_SET(dbp->am_ok,
          DB_OK_BTREE | DB_OK_HASH | DB_OK_QUEUE | DB_OK_RECNO);

      /* DB PUBLIC HANDLE LIST BEGIN */
      dbp->associate = __db_associate_pp;
      dbp->close = __db_close_pp;
      dbp->compact = __db_compact_pp;
      dbp->cursor = __db_cursor_pp;
      dbp->del = __db_del_pp;
      dbp->dump = __db_dump_pp;
      dbp->err = __dbh_err;
      dbp->errx = __dbh_errx;
      dbp->fd = __db_fd_pp;
      dbp->get = __db_get_pp;
      dbp->get_byteswapped = __db_get_byteswapped;
      dbp->get_cachesize = __db_get_cachesize;
      dbp->get_dbname = __db_get_dbname;
      dbp->get_encrypt_flags = __db_get_encrypt_flags;
      dbp->get_env = __db_get_env;
      dbp->get_errfile = __db_get_errfile;
      dbp->get_errpfx = __db_get_errpfx;
      dbp->get_flags = __db_get_flags;
      dbp->get_lorder = __db_get_lorder;
      dbp->get_mpf = __db_get_mpf;
      dbp->get_msgfile = __db_get_msgfile;
      dbp->get_open_flags = __db_get_open_flags;
      dbp->get_pagesize = __db_get_pagesize;
      dbp->get_transactional = __db_get_transactional;
      dbp->get_type = __db_get_type;
      dbp->join = __db_join_pp;
      dbp->key_range = __db_key_range_pp;
      dbp->open = __db_open_pp;
      dbp->pget = __db_pget_pp;
      dbp->put = __db_put_pp;
      dbp->remove = __db_remove_pp;
      dbp->rename = __db_rename_pp;
      dbp->set_alloc = __db_set_alloc;
      dbp->set_append_recno = __db_set_append_recno;
      dbp->set_cachesize = __db_set_cachesize;
      dbp->set_dup_compare = __db_set_dup_compare;
      dbp->set_encrypt = __db_set_encrypt;
      dbp->set_errcall = __db_set_errcall;
      dbp->set_errfile = __db_set_errfile;
      dbp->set_errpfx = __db_set_errpfx;
      dbp->set_feedback = __db_set_feedback;
      dbp->set_flags = __db_set_flags;
      dbp->set_lorder = __db_set_lorder;
      dbp->set_msgcall = __db_set_msgcall;
      dbp->set_msgfile = __db_set_msgfile;
      dbp->set_pagesize = __db_set_pagesize;
      dbp->set_paniccall = __db_set_paniccall;
      dbp->stat = __db_stat_pp;
      dbp->stat_print = __db_stat_print_pp;
      dbp->sync = __db_sync_pp;
      dbp->truncate = __db_truncate_pp;
      dbp->upgrade = __db_upgrade_pp;
      dbp->verify = __db_verify_pp;
      /* DB PUBLIC HANDLE LIST END */

                              /* Access method specific. */
      if ((ret = __bam_db_create(dbp)) != 0)
            return (ret);
      if ((ret = __ham_db_create(dbp)) != 0)
            return (ret);
      if ((ret = __qam_db_create(dbp)) != 0)
            return (ret);

      /*
       * XA specific: must be last, as we replace methods set by the
       * access methods.
       */
      if (LF_ISSET(DB_XA_CREATE) && (ret = __db_xa_create(dbp)) != 0)
            return (ret);

#ifdef HAVE_RPC
      /*
       * RPC specific: must be last, as we replace methods set by the
       * access methods.
       */
      if (dbenv != NULL && RPC_ON(dbenv)) {
            __dbcl_dbp_init(dbp);
            /*
             * !!!
             * We wrap the DB->open method for RPC, and the rpc.src file
             * can't handle that.
             */
            dbp->open = __dbcl_db_open_wrap;
            if ((ret = __dbcl_db_create(dbp, dbenv, flags)) != 0)
                  return (ret);
      }
#else
      COMPQUIET(dbenv, NULL);
#endif

      return (0);
}

/*
 * __dbh_am_chk --
 *    Error if an unreasonable method is called.
 *
 * PUBLIC: int __dbh_am_chk __P((DB *, u_int32_t));
 */
int
__dbh_am_chk(dbp, flags)
      DB *dbp;
      u_int32_t flags;
{
      /*
       * We start out allowing any access methods to be called, and as the
       * application calls the methods the options become restricted.  The
       * idea is to quit as soon as an illegal method combination is called.
       */
      if ((LF_ISSET(DB_OK_BTREE) && FLD_ISSET(dbp->am_ok, DB_OK_BTREE)) ||
          (LF_ISSET(DB_OK_HASH) && FLD_ISSET(dbp->am_ok, DB_OK_HASH)) ||
          (LF_ISSET(DB_OK_QUEUE) && FLD_ISSET(dbp->am_ok, DB_OK_QUEUE)) ||
          (LF_ISSET(DB_OK_RECNO) && FLD_ISSET(dbp->am_ok, DB_OK_RECNO))) {
            FLD_CLR(dbp->am_ok, ~flags);
            return (0);
      }

      __db_err(dbp->dbenv,
    "call implies an access method which is inconsistent with previous calls");
      return (EINVAL);
}

/*
 * __dbh_err --
 *    Error message, including the standard error string.
 */
static void
#ifdef STDC_HEADERS
__dbh_err(DB *dbp, int error, const char *fmt, ...)
#else
__dbh_err(dbp, error, fmt, va_alist)
      DB *dbp;
      int error;
      const char *fmt;
      va_dcl
#endif
{
      DB_REAL_ERR(dbp->dbenv, error, 1, 1, fmt);
}

/*
 * __dbh_errx --
 *    Error message.
 */
static void
#ifdef STDC_HEADERS
__dbh_errx(DB *dbp, const char *fmt, ...)
#else
__dbh_errx(dbp, fmt, va_alist)
      DB *dbp;
      const char *fmt;
      va_dcl
#endif
{
      DB_REAL_ERR(dbp->dbenv, 0, 0, 1, fmt);
}

/*
 * __db_get_byteswapped --
 *    Return if database requires byte swapping.
 */
static int
__db_get_byteswapped(dbp, isswapped)
      DB *dbp;
      int *isswapped;
{
      DB_ILLEGAL_BEFORE_OPEN(dbp, "DB->get_byteswapped");

      *isswapped = F_ISSET(dbp, DB_AM_SWAP) ? 1 : 0;
      return (0);
}

/*
 * __db_get_dbname --
 *    Get the name of the database as passed to DB->open.
 */
static int
__db_get_dbname(dbp, fnamep, dnamep)
      DB *dbp;
      const char **fnamep, **dnamep;
{
      DB_ILLEGAL_BEFORE_OPEN(dbp, "DB->get_dbname");

      if (fnamep != NULL)
            *fnamep = dbp->fname;
      if (dnamep != NULL)
            *dnamep = dbp->dname;
      return (0);
}

/*
 * __db_get_env --
 *    Get the DB_ENV handle that was passed to db_create.
 */
static DB_ENV *
__db_get_env(dbp)
      DB *dbp;
{
      return (dbp->dbenv);
}

/*
 * __db_get_mpf --
 *    Get the underlying DB_MPOOLFILE handle.
 */
static DB_MPOOLFILE *
__db_get_mpf(dbp)
      DB *dbp;
{
      return (dbp->mpf);
}

/*
 * get_transactional --
 *    Get whether this database was created in a transaction.
 */
static int
__db_get_transactional(dbp)
      DB *dbp;
{
      return (F_ISSET(dbp, DB_AM_TXN) ? 1 : 0);
}

/*
 * __db_get_type --
 *    Return type of underlying database.
 */
static int
__db_get_type(dbp, dbtype)
      DB *dbp;
      DBTYPE *dbtype;
{
      DB_ILLEGAL_BEFORE_OPEN(dbp, "DB->get_type");

      *dbtype = dbp->type;
      return (0);
}

/*
 * __db_set_append_recno --
 *    Set record number append routine.
 */
static int
__db_set_append_recno(dbp, func)
      DB *dbp;
      int (*func) __P((DB *, DBT *, db_recno_t));
{
      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_append_recno");
      DB_ILLEGAL_METHOD(dbp, DB_OK_QUEUE | DB_OK_RECNO);

      dbp->db_append_recno = func;

      return (0);
}

/*
 * __db_get_cachesize --
 *    Get underlying cache size.
 */
static int
__db_get_cachesize(dbp, cache_gbytesp, cache_bytesp, ncachep)
      DB *dbp;
      u_int32_t *cache_gbytesp, *cache_bytesp;
      int *ncachep;
{
      DB_ILLEGAL_IN_ENV(dbp, "DB->get_cachesize");

      return (__memp_get_cachesize(dbp->dbenv,
          cache_gbytesp, cache_bytesp, ncachep));
}

/*
 * __db_set_cachesize --
 *    Set underlying cache size.
 */
static int
__db_set_cachesize(dbp, cache_gbytes, cache_bytes, ncache)
      DB *dbp;
      u_int32_t cache_gbytes, cache_bytes;
      int ncache;
{
      DB_ILLEGAL_IN_ENV(dbp, "DB->set_cachesize");
      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_cachesize");

      return (__memp_set_cachesize(
          dbp->dbenv, cache_gbytes, cache_bytes, ncache));
}

/*
 * __db_set_dup_compare --
 *    Set duplicate comparison routine.
 */
static int
__db_set_dup_compare(dbp, func)
      DB *dbp;
      int (*func) __P((DB *, const DBT *, const DBT *));
{
      int ret;

      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->dup_compare");
      DB_ILLEGAL_METHOD(dbp, DB_OK_BTREE | DB_OK_HASH);

      if ((ret = __db_set_flags(dbp, DB_DUPSORT)) != 0)
            return (ret);

      dbp->dup_compare = func;

      return (0);
}

/*
 * __db_get_encrypt_flags --
 */
static int
__db_get_encrypt_flags(dbp, flagsp)
      DB *dbp;
      u_int32_t *flagsp;
{
      DB_ILLEGAL_IN_ENV(dbp, "DB->get_encrypt_flags");

      return (__env_get_encrypt_flags(dbp->dbenv, flagsp));
}

/*
 * __db_set_encrypt --
 *    Set database passwd.
 */
static int
__db_set_encrypt(dbp, passwd, flags)
      DB *dbp;
      const char *passwd;
      u_int32_t flags;
{
      DB_CIPHER *db_cipher;
      int ret;

      DB_ILLEGAL_IN_ENV(dbp, "DB->set_encrypt");
      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_encrypt");

      if ((ret = __env_set_encrypt(dbp->dbenv, passwd, flags)) != 0)
            return (ret);

      /*
       * In a real env, this gets initialized with the region.  In a local
       * env, we must do it here.
       */
      db_cipher = (DB_CIPHER *)dbp->dbenv->crypto_handle;
      if (!F_ISSET(db_cipher, CIPHER_ANY) &&
          (ret = db_cipher->init(dbp->dbenv, db_cipher)) != 0)
            return (ret);

      return (__db_set_flags(dbp, DB_ENCRYPT));
}

static void
__db_set_errcall(dbp, errcall)
      DB *dbp;
      void (*errcall) __P((const DB_ENV *, const char *, const char *));
{
      __env_set_errcall(dbp->dbenv, errcall);
}

static void
__db_get_errfile(dbp, errfilep)
      DB *dbp;
      FILE **errfilep;
{
      __env_get_errfile(dbp->dbenv, errfilep);
}

static void
__db_set_errfile(dbp, errfile)
      DB *dbp;
      FILE *errfile;
{
      __env_set_errfile(dbp->dbenv, errfile);
}

static void
__db_get_errpfx(dbp, errpfxp)
      DB *dbp;
      const char **errpfxp;
{
      __env_get_errpfx(dbp->dbenv, errpfxp);
}

static void
__db_set_errpfx(dbp, errpfx)
      DB *dbp;
      const char *errpfx;
{
      __env_set_errpfx(dbp->dbenv, errpfx);
}

static int
__db_set_feedback(dbp, feedback)
      DB *dbp;
      void (*feedback) __P((DB *, int, int));
{
      dbp->db_feedback = feedback;
      return (0);
}

/*
 * __db_map_flags --
 *    Maps between public and internal flag values.
 *      This function doesn't check for validity, so it can't fail.
 */
static void
__db_map_flags(dbp, inflagsp, outflagsp)
      DB *dbp;
      u_int32_t *inflagsp, *outflagsp;
{
      COMPQUIET(dbp, NULL);

      if (FLD_ISSET(*inflagsp, DB_CHKSUM)) {
            FLD_SET(*outflagsp, DB_AM_CHKSUM);
            FLD_CLR(*inflagsp, DB_CHKSUM);
      }
      if (FLD_ISSET(*inflagsp, DB_ENCRYPT)) {
            FLD_SET(*outflagsp, DB_AM_ENCRYPT | DB_AM_CHKSUM);
            FLD_CLR(*inflagsp, DB_ENCRYPT);
      }
      if (FLD_ISSET(*inflagsp, DB_TXN_NOT_DURABLE)) {
            FLD_SET(*outflagsp, DB_AM_NOT_DURABLE);
            FLD_CLR(*inflagsp, DB_TXN_NOT_DURABLE);
      }
}

/*
 * __db_get_flags --
 *    The DB->get_flags method.
 *
 * PUBLIC: int __db_get_flags __P((DB *, u_int32_t *));
 */
int
__db_get_flags(dbp, flagsp)
      DB *dbp;
      u_int32_t *flagsp;
{
      static const u_int32_t db_flags[] = {
            DB_CHKSUM,
            DB_DUP,
            DB_DUPSORT,
            DB_ENCRYPT,
            DB_INORDER,
            DB_RECNUM,
            DB_RENUMBER,
            DB_REVSPLITOFF,
            DB_SNAPSHOT,
            DB_TXN_NOT_DURABLE,
            0
      };
      u_int32_t f, flags, mapped_flag;
      int i;

      flags = 0;
      for (i = 0; (f = db_flags[i]) != 0; i++) {
            mapped_flag = 0;
            __db_map_flags(dbp, &f, &mapped_flag);
            __bam_map_flags(dbp, &f, &mapped_flag);
            __ram_map_flags(dbp, &f, &mapped_flag);
#ifdef HAVE_QUEUE
            __qam_map_flags(dbp, &f, &mapped_flag);
#endif
            DB_ASSERT(f == 0);
            if (F_ISSET(dbp, mapped_flag) == mapped_flag)
                  LF_SET(db_flags[i]);
      }

      *flagsp = flags;
      return (0);
}

/*
 * __db_set_flags --
 *    DB->set_flags.
 *
 * PUBLIC: int  __db_set_flags __P((DB *, u_int32_t));
 */
int
__db_set_flags(dbp, flags)
      DB *dbp;
      u_int32_t flags;
{
      DB_ENV *dbenv;
      int ret;

      dbenv = dbp->dbenv;

      if (LF_ISSET(DB_ENCRYPT) && !CRYPTO_ON(dbenv)) {
            __db_err(dbenv,
                "Database environment not configured for encryption");
            return (EINVAL);
      }
      if (LF_ISSET(DB_TXN_NOT_DURABLE))
            ENV_REQUIRES_CONFIG(dbenv,
                dbenv->tx_handle, "DB_NOT_DURABLE", DB_INIT_TXN);

      __db_map_flags(dbp, &flags, &dbp->flags);

      if ((ret = __bam_set_flags(dbp, &flags)) != 0)
            return (ret);
      if ((ret = __ram_set_flags(dbp, &flags)) != 0)
            return (ret);
#ifdef HAVE_QUEUE
      if ((ret = __qam_set_flags(dbp, &flags)) != 0)
            return (ret);
#endif

      return (flags == 0 ? 0 : __db_ferr(dbenv, "DB->set_flags", 0));
}

/*
 * __db_get_lorder --
 *    Get whether lorder is swapped or not.
 *
 * PUBLIC: int  __db_get_lorder __P((DB *, int *));
 */
int
__db_get_lorder(dbp, db_lorderp)
      DB *dbp;
      int *db_lorderp;
{
      int ret;

      /* Flag if the specified byte order requires swapping. */
      switch (ret = __db_byteorder(dbp->dbenv, 1234)) {
      case 0:
            *db_lorderp = F_ISSET(dbp, DB_AM_SWAP) ? 4321 : 1234;
            break;
      case DB_SWAPBYTES:
            *db_lorderp = F_ISSET(dbp, DB_AM_SWAP) ? 1234 : 4321;
            break;
      default:
            return (ret);
            /* NOTREACHED */
      }

      return (0);
}

/*
 * __db_set_lorder --
 *    Set whether lorder is swapped or not.
 *
 * PUBLIC: int  __db_set_lorder __P((DB *, int));
 */
int
__db_set_lorder(dbp, db_lorder)
      DB *dbp;
      int db_lorder;
{
      int ret;

      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_lorder");

      /* Flag if the specified byte order requires swapping. */
      switch (ret = __db_byteorder(dbp->dbenv, db_lorder)) {
      case 0:
            F_CLR(dbp, DB_AM_SWAP);
            break;
      case DB_SWAPBYTES:
            F_SET(dbp, DB_AM_SWAP);
            break;
      default:
            return (ret);
            /* NOTREACHED */
      }
      return (0);
}

static int
__db_set_alloc(dbp, mal_func, real_func, free_func)
      DB *dbp;
      void *(*mal_func) __P((size_t));
      void *(*real_func) __P((void *, size_t));
      void (*free_func) __P((void *));
{
      DB_ILLEGAL_IN_ENV(dbp, "DB->set_alloc");
      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_alloc");

      return (__env_set_alloc(dbp->dbenv, mal_func, real_func, free_func));
}

static void
__db_set_msgcall(dbp, msgcall)
      DB *dbp;
      void (*msgcall) __P((const DB_ENV *, const char *));
{
      __env_set_msgcall(dbp->dbenv, msgcall);
}

static void
__db_get_msgfile(dbp, msgfilep)
      DB *dbp;
      FILE **msgfilep;
{
      __env_get_msgfile(dbp->dbenv, msgfilep);
}

static void
__db_set_msgfile(dbp, msgfile)
      DB *dbp;
      FILE *msgfile;
{
      __env_set_msgfile(dbp->dbenv, msgfile);
}

static int
__db_get_pagesize(dbp, db_pagesizep)
      DB *dbp;
      u_int32_t *db_pagesizep;
{
      *db_pagesizep = dbp->pgsize;
      return (0);
}

/*
 * __db_set_pagesize --
 *    DB->set_pagesize
 *
 * PUBLIC: int  __db_set_pagesize __P((DB *, u_int32_t));
 */
int
__db_set_pagesize(dbp, db_pagesize)
      DB *dbp;
      u_int32_t db_pagesize;
{
      DB_ILLEGAL_AFTER_OPEN(dbp, "DB->set_pagesize");

      if (db_pagesize < DB_MIN_PGSIZE) {
            __db_err(dbp->dbenv, "page sizes may not be smaller than %lu",
                (u_long)DB_MIN_PGSIZE);
            return (EINVAL);
      }
      if (db_pagesize > DB_MAX_PGSIZE) {
            __db_err(dbp->dbenv, "page sizes may not be larger than %lu",
                (u_long)DB_MAX_PGSIZE);
            return (EINVAL);
      }

      /*
       * We don't want anything that's not a power-of-2, as we rely on that
       * for alignment of various types on the pages.
       */
      if (!POWER_OF_TWO(db_pagesize)) {
            __db_err(dbp->dbenv, "page sizes must be a power-of-2");
            return (EINVAL);
      }

      /*
       * XXX
       * Should we be checking for a page size that's not a multiple of 512,
       * so that we never try and write less than a disk sector?
       */
      dbp->pgsize = db_pagesize;

      return (0);
}

static int
__db_set_paniccall(dbp, paniccall)
      DB *dbp;
      void (*paniccall) __P((DB_ENV *, int));
{
      return (__env_set_paniccall(dbp->dbenv, paniccall));
}

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