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Sourcecode: db4.1 version File versions

cxx_env.cpp

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2002
 *    Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: cxx_env.cpp,v 11.88 2002/08/26 22:13:36 mjc Exp $";
#endif /* not lint */

#include <errno.h>
#include <stdio.h>              // needed for set_error_stream
#include <string.h>

#include "db_cxx.h"
#include "dbinc/cxx_int.h"

#include "db_int.h"
#include "dbinc_auto/common_ext.h"

#ifdef HAVE_CXX_STDHEADERS
using std::cerr;
#endif

// Helper macros for simple methods that pass through to the
// underlying C method.  They may return an error or raise an exception.
// These macros expect that input _argspec is an argument
// list element (e.g., "char *arg") and that _arglist is the arguments
// that should be passed through to the C method (e.g., "(dbenv, arg)")
//
#define     DBENV_METHOD_ERR(_name, _argspec, _arglist, _on_err)    \
int DbEnv::_name _argspec                               \
{                                                 \
      DB_ENV *dbenv = unwrap(this);                     \
      int ret;                                    \
                                                  \
      if ((ret = dbenv->_name _arglist) != 0)   {             \
            _on_err;                              \
      }                                           \
      return (ret);                                     \
}

#define     DBENV_METHOD(_name, _argspec, _arglist)                 \
      DBENV_METHOD_ERR(_name, _argspec, _arglist,             \
                   DB_ERROR("DbEnv::" # _name, ret, error_policy()))

#define     DBENV_METHOD_QUIET(_name, _argspec, _arglist)           \
int DbEnv::_name _argspec                               \
{                                                 \
      DB_ENV *dbenv = unwrap(this);                     \
                                                  \
      return (dbenv->_name _arglist);                         \
}

#define     DBENV_METHOD_VOID(_name, _argspec, _arglist)            \
void DbEnv::_name _argspec                              \
{                                                 \
      DB_ENV *dbenv = unwrap(this);                     \
                                                  \
      dbenv->_name _arglist;                            \
}

// This datatype is needed for picky compilers.
//
extern "C" {
      typedef void (*db_errcall_fcn_type)
            (const char *, char *);
};

// The reason for a static variable is that some structures
// (like Dbts) have no connection to any Db or DbEnv, so when
// errors occur in their methods, we must have some reasonable
// way to determine whether to throw or return errors.
//
// This variable is taken from flags whenever a DbEnv is constructed.
// Normally there is only one DbEnv per program, and even if not,
// there is typically a single policy of throwing or returning.
//
static int last_known_error_policy = ON_ERROR_UNKNOWN;

__DB_OSTREAMCLASS *DbEnv::error_stream_ = 0;

// These 'glue' function are declared as extern "C" so they will
// be compatible with picky compilers that do not allow mixing
// of function pointers to 'C' functions with function pointers
// to C++ functions.
//
extern "C"
void _feedback_intercept_c(DB_ENV *env, int opcode, int pct)
{
      DbEnv::_feedback_intercept(env, opcode, pct);
}

extern "C"
void _paniccall_intercept_c(DB_ENV *env, int errval)
{
      DbEnv::_paniccall_intercept(env, errval);
}

extern "C"
void _stream_error_function_c(const char *prefix, char *message)
{
      DbEnv::_stream_error_function(prefix, message);
}

extern "C"
int _app_dispatch_intercept_c(DB_ENV *env, DBT *dbt,
                      DB_LSN *lsn, db_recops op)
{
      return (DbEnv::_app_dispatch_intercept(env, dbt, lsn, op));
}

extern "C"
int _rep_send_intercept_c(DB_ENV *env, const DBT *cntrl,
                    const DBT *data, int id, u_int32_t flags)
{
      return (DbEnv::_rep_send_intercept(env,
          cntrl, data, id, flags));
}

void DbEnv::_feedback_intercept(DB_ENV *env, int opcode, int pct)
{
      if (env == 0) {
            DB_ERROR("DbEnv::feedback_callback", EINVAL, ON_ERROR_UNKNOWN);
            return;
      }
      DbEnv *cxxenv = (DbEnv *)env->api1_internal;
      if (cxxenv == 0) {
            DB_ERROR("DbEnv::feedback_callback", EINVAL, ON_ERROR_UNKNOWN);
            return;
      }
      if (cxxenv->feedback_callback_ == 0) {
            DB_ERROR("DbEnv::feedback_callback", EINVAL,
                   cxxenv->error_policy());
            return;
      }
      (*cxxenv->feedback_callback_)(cxxenv, opcode, pct);
}

void DbEnv::_paniccall_intercept(DB_ENV *env, int errval)
{
      if (env == 0) {
            DB_ERROR("DbEnv::paniccall_callback", EINVAL,
                ON_ERROR_UNKNOWN);
      }
      DbEnv *cxxenv = (DbEnv *)env->api1_internal;
      if (cxxenv == 0) {
            DB_ERROR("DbEnv::paniccall_callback", EINVAL,
                ON_ERROR_UNKNOWN);
      }
      if (cxxenv->paniccall_callback_ == 0) {
            DB_ERROR("DbEnv::paniccall_callback", EINVAL,
                cxxenv->error_policy());
      }
      (*cxxenv->paniccall_callback_)(cxxenv, errval);
}

int DbEnv::_app_dispatch_intercept(DB_ENV *env, DBT *dbt,
                        DB_LSN *lsn, db_recops op)
{
      if (env == 0) {
            DB_ERROR("DbEnv::app_dispatch_callback",
                EINVAL, ON_ERROR_UNKNOWN);
            return (EINVAL);
      }
      DbEnv *cxxenv = (DbEnv *)env->api1_internal;
      if (cxxenv == 0) {
            DB_ERROR("DbEnv::app_dispatch_callback",
                EINVAL, ON_ERROR_UNKNOWN);
            return (EINVAL);
      }
      if (cxxenv->app_dispatch_callback_ == 0) {
            DB_ERROR("DbEnv::app_dispatch_callback",
                EINVAL, cxxenv->error_policy());
            return (EINVAL);
      }
      Dbt *cxxdbt = (Dbt *)dbt;
      DbLsn *cxxlsn = (DbLsn *)lsn;
      return ((*cxxenv->app_dispatch_callback_)(cxxenv, cxxdbt, cxxlsn, op));
}

int DbEnv::_rep_send_intercept(DB_ENV *env, const DBT *cntrl,
                         const DBT *data, int id, u_int32_t flags)
{

      if (env == 0) {
            DB_ERROR("DbEnv::rep_send_callback", EINVAL, ON_ERROR_UNKNOWN);
            return (EINVAL);
      }
      DbEnv *cxxenv = (DbEnv *)env->api1_internal;
      if (cxxenv == 0) {
            DB_ERROR("DbEnv::rep_send_callback", EINVAL, ON_ERROR_UNKNOWN);
            return (EINVAL);
      }
      const Dbt *cxxcntrl = (const Dbt *)cntrl;
      Dbt *cxxdata = (Dbt *)data;
      return ((*cxxenv->rep_send_callback_)(cxxenv,
          cxxcntrl, cxxdata, id, flags));
}

// A truism for the DbEnv object is that there is a valid
// DB_ENV handle from the constructor until close().
// After the close, the DB_ENV handle is invalid and
// no operations are permitted on the DbEnv (other than
// destructor).  Leaving the DbEnv handle open and not
// doing a close is generally considered an error.
//
// We used to allow DbEnv objects to be closed and reopened.
// This implied always keeping a valid DB_ENV object, and
// coordinating the open objects between Db/DbEnv turned
// out to be overly complicated.  Now we do not allow this.

DbEnv::DbEnv(u_int32_t flags)
:     imp_(0)
,     construct_error_(0)
,     construct_flags_(flags)
,     app_dispatch_callback_(0)
,     feedback_callback_(0)
,     paniccall_callback_(0)
,     pgin_callback_(0)
,     pgout_callback_(0)
,     rep_send_callback_(0)
{
      if ((construct_error_ = initialize(0)) != 0)
            DB_ERROR("DbEnv::DbEnv", construct_error_, error_policy());
}

DbEnv::DbEnv(DB_ENV *env, u_int32_t flags)
:     imp_(0)
,     construct_error_(0)
,     construct_flags_(flags)
,     app_dispatch_callback_(0)
,     feedback_callback_(0)
,     paniccall_callback_(0)
,     pgin_callback_(0)
,     pgout_callback_(0)
,     rep_send_callback_(0)
{
      if ((construct_error_ = initialize(env)) != 0)
            DB_ERROR("DbEnv::DbEnv", construct_error_, error_policy());
}

// If the DB_ENV handle is still open, we close it.  This is to make stack
// allocation of DbEnv objects easier so that they are cleaned up in the error
// path.  Note that the C layer catches cases where handles are open in the
// environment at close time and reports an error.  Applications should call
// close explicitly in normal (non-exceptional) cases to check the return
// value.
//
DbEnv::~DbEnv()
{
      DB_ENV *env = unwrap(this);

      if (env != NULL) {
            cleanup();
            (void)env->close(env, 0);
      }
}

// called by destructors before the DB_ENV is destroyed.
void DbEnv::cleanup()
{
      DB_ENV *env = unwrap(this);

      if (env != NULL) {
            env->api1_internal = 0;
            imp_ = 0;
      }
}

int DbEnv::close(u_int32_t flags)
{
      int ret;
      DB_ENV *env = unwrap(this);

      // after a close (no matter if success or failure),
      // the underlying DB_ENV object must not be accessed,
      // so we clean up in advance.
      //
      cleanup();

      // It's safe to throw an error after the close,
      // since our error mechanism does not peer into
      // the DB* structures.
      //
      if ((ret = env->close(env, flags)) != 0)
            DB_ERROR("DbEnv::close", ret, error_policy());

      return (ret);
}

DBENV_METHOD(dbremove,
    (DbTxn *txn, const char *name, const char *subdb, u_int32_t flags),
    (dbenv, unwrap(txn), name, subdb, flags))
DBENV_METHOD(dbrename, (DbTxn *txn, const char *name, const char *subdb,
    const char *newname, u_int32_t flags),
    (dbenv, unwrap(txn), name, subdb, newname, flags))

void DbEnv::err(int error, const char *format, ...)
{
      DB_ENV *env = unwrap(this);

      DB_REAL_ERR(env, error, 1, 1, format);
}

// Return a tristate value corresponding to whether we should
// throw exceptions on errors:
//   ON_ERROR_RETURN
//   ON_ERROR_THROW
//   ON_ERROR_UNKNOWN
//
int DbEnv::error_policy()
{
      if ((construct_flags_ & DB_CXX_NO_EXCEPTIONS) != 0) {
            return (ON_ERROR_RETURN);
      }
      else {
            return (ON_ERROR_THROW);
      }
}

void DbEnv::errx(const char *format, ...)
{
      DB_ENV *env = unwrap(this);

      DB_REAL_ERR(env, 0, 0, 1, format);
}

void *DbEnv::get_app_private() const
{
      return unwrapConst(this)->app_private;
}

// used internally during constructor
// to associate an existing DB_ENV with this DbEnv,
// or create a new one.
//
int DbEnv::initialize(DB_ENV *env)
{
      int ret;

      last_known_error_policy = error_policy();

      if (env == 0) {
            // Create a new DB_ENV environment.
            if ((ret = ::db_env_create(&env,
                construct_flags_ & ~DB_CXX_NO_EXCEPTIONS)) != 0)
                  return (ret);
      }
      imp_ = wrap(env);
      env->api1_internal = this;    // for DB_ENV* to DbEnv* conversion
      return (0);
}

// lock methods
DBENV_METHOD(lock_detect, (u_int32_t flags, u_int32_t atype, int *aborted),
    (dbenv, flags, atype, aborted))
DBENV_METHOD_ERR(lock_get,
    (u_int32_t locker, u_int32_t flags, const Dbt *obj,
    db_lockmode_t lock_mode, DbLock *lock),
    (dbenv, locker, flags, obj, lock_mode, &lock->lock_),
    DbEnv::runtime_error_lock_get("DbEnv::lock_get", ret,
                          DB_LOCK_GET, lock_mode, obj, *lock,
                          -1, error_policy()))
DBENV_METHOD(lock_id, (u_int32_t *idp), (dbenv, idp))
DBENV_METHOD(lock_id_free, (u_int32_t id), (dbenv, id))
DBENV_METHOD(lock_put, (DbLock *lock), (dbenv, &lock->lock_))
DBENV_METHOD(lock_stat, (DB_LOCK_STAT **statp, u_int32_t flags),
    (dbenv, statp, flags))
DBENV_METHOD_ERR(lock_vec,
    (u_int32_t locker, u_int32_t flags, DB_LOCKREQ list[],
    int nlist, DB_LOCKREQ **elist_returned),
    (dbenv, locker, flags, list, nlist, elist_returned),
    DbEnv::runtime_error_lock_get("DbEnv::lock_vec", ret,
      (*elist_returned)->op, (*elist_returned)->mode,
      Dbt::get_Dbt((*elist_returned)->obj), DbLock((*elist_returned)->lock),
      (*elist_returned) - list, error_policy()))
// log methods
DBENV_METHOD(log_archive, (char **list[], u_int32_t flags),
    (dbenv, list, flags))

int DbEnv::log_compare(const DbLsn *lsn0, const DbLsn *lsn1)
{
      return (::log_compare(lsn0, lsn1));
}

// The following cast implies that DbLogc can be no larger than DB_LOGC
DBENV_METHOD(log_cursor, (DbLogc **cursorp, u_int32_t flags),
    (dbenv, (DB_LOGC **)cursorp, flags))
DBENV_METHOD(log_file, (DbLsn *lsn, char *namep, size_t len),
    (dbenv, lsn, namep, len))
DBENV_METHOD(log_flush, (const DbLsn *lsn), (dbenv, lsn))
DBENV_METHOD(log_put, (DbLsn *lsn, const Dbt *data, u_int32_t flags),
    (dbenv, lsn, data, flags))
DBENV_METHOD(log_stat, (DB_LOG_STAT **spp, u_int32_t flags),
    (dbenv, spp, flags))

int DbEnv::memp_fcreate(DbMpoolFile **dbmfp, u_int32_t flags)
{
      DB_ENV *env = unwrap(this);
      int ret;
      DB_MPOOLFILE *mpf;

      if (env == NULL)
            ret = EINVAL;
      else
            ret = env->memp_fcreate(env, &mpf, flags);

      if (DB_RETOK_STD(ret)) {
            *dbmfp = new DbMpoolFile();
            (*dbmfp)->imp_ = wrap(mpf);
      } else
            DB_ERROR("DbMpoolFile::f_create", ret, ON_ERROR_UNKNOWN);

      return (ret);
}

DBENV_METHOD(memp_register,
    (int ftype, pgin_fcn_type pgin_fcn, pgout_fcn_type pgout_fcn),
    (dbenv, ftype, pgin_fcn, pgout_fcn))

// memory pool methods
DBENV_METHOD(memp_stat,
    (DB_MPOOL_STAT **gsp, DB_MPOOL_FSTAT ***fsp, u_int32_t flags),
    (dbenv, gsp, fsp, flags))

DBENV_METHOD(memp_sync, (DbLsn *sn), (dbenv, sn))

DBENV_METHOD(memp_trickle, (int pct, int *nwrotep), (dbenv, pct, nwrotep))

// If an error occurred during the constructor, report it now.
// Otherwise, call the underlying DB->open method.
//
int DbEnv::open(const char *db_home, u_int32_t flags, int mode)
{
      int ret;
      DB_ENV *env = unwrap(this);

      if (construct_error_ != 0)
            ret = construct_error_;
      else
            ret = env->open(env, db_home, flags, mode);

      if (!DB_RETOK_STD(ret))
            DB_ERROR("DbEnv::open", ret, error_policy());

      return (ret);
}

int DbEnv::remove(const char *db_home, u_int32_t flags)
{
      int ret;
      DB_ENV *env = unwrap(this);

      // after a remove (no matter if success or failure),
      // the underlying DB_ENV object must not be accessed,
      // so we clean up in advance.
      //
      cleanup();

      if ((ret = env->remove(env, db_home, flags)) != 0)
            DB_ERROR("DbEnv::remove", ret, error_policy());

      return (ret);
}

// Report an error associated with the DbEnv.
// error_policy is one of:
//   ON_ERROR_THROW     throw an error
//   ON_ERROR_RETURN    do nothing here, the caller will return an error
//   ON_ERROR_UNKNOWN   defer the policy to policy saved in DbEnv::DbEnv
//
void DbEnv::runtime_error(const char *caller, int error, int error_policy)
{
      if (error_policy == ON_ERROR_UNKNOWN)
            error_policy = last_known_error_policy;
      if (error_policy == ON_ERROR_THROW) {
            // Creating and throwing the object in two separate
            // statements seems to be necessary for HP compilers.
            switch (error) {
            case DB_LOCK_DEADLOCK:
                  {
                        DbDeadlockException dl_except(caller);
                        throw dl_except;
                  }
                  break;
            case DB_RUNRECOVERY:
                  {
                        DbRunRecoveryException rr_except(caller);
                        throw rr_except;
                  }
                  break;
            default:
                  {
                        DbException except(caller, error);
                        throw except;
                  }
                  break;
            }
      }
}

// Like DbEnv::runtime_error, but issue a DbMemoryException
// based on the fact that this Dbt is not large enough.
void DbEnv::runtime_error_dbt(const char *caller, Dbt *dbt, int error_policy)
{
      if (error_policy == ON_ERROR_UNKNOWN)
            error_policy = last_known_error_policy;
      if (error_policy == ON_ERROR_THROW) {
            // Creating and throwing the object in two separate
            // statements seems to be necessary for HP compilers.
            DbMemoryException except(caller, dbt);
            throw except;
      }
}

// Like DbEnv::runtime_error, but issue a DbLockNotGrantedException,
// or a regular runtime error.
// call regular runtime_error if it
void DbEnv::runtime_error_lock_get(const char *caller, int error,
    db_lockop_t op, db_lockmode_t mode, const Dbt *obj,
    DbLock lock, int index, int error_policy)
{
      if (error != DB_LOCK_NOTGRANTED) {
            runtime_error(caller, error, error_policy);
            return;
      }

      if (error_policy == ON_ERROR_UNKNOWN)
            error_policy = last_known_error_policy;
      if (error_policy == ON_ERROR_THROW) {
            // Creating and throwing the object in two separate
            // statements seems to be necessary for HP compilers.
            DbLockNotGrantedException except(caller, op, mode,
                obj, lock, index);
            throw except;
      }
}

// static method
char *DbEnv::strerror(int error)
{
      return (db_strerror(error));
}

void DbEnv::_stream_error_function(const char *prefix, char *message)
{
      // HP compilers need the extra casts, we don't know why.
      if (error_stream_) {
            if (prefix) {
                  (*error_stream_) << prefix << (const char *)": ";
            }
            if (message) {
                  (*error_stream_) << (const char *)message;
            }
            (*error_stream_) << (const char *)"\n";
      }
}

// set methods

DBENV_METHOD_VOID(set_errfile, (FILE *errfile), (dbenv, errfile))
DBENV_METHOD_VOID(set_errpfx, (const char *errpfx), (dbenv, errpfx))

// We keep these alphabetical by field name,
// for comparison with Java's list.
//
DBENV_METHOD(set_data_dir, (const char *dir), (dbenv, dir))
DBENV_METHOD(set_encrypt, (const char *passwd, int flags),
    (dbenv, passwd, flags))
DBENV_METHOD(set_lg_bsize, (u_int32_t bsize), (dbenv, bsize))
DBENV_METHOD(set_lg_dir, (const char *dir), (dbenv, dir))
DBENV_METHOD(set_lg_max, (u_int32_t max), (dbenv, max))
DBENV_METHOD(set_lg_regionmax, (u_int32_t regionmax), (dbenv, regionmax))
DBENV_METHOD(set_lk_detect, (u_int32_t detect), (dbenv, detect))
DBENV_METHOD(set_lk_max, (u_int32_t max), (dbenv, max))
DBENV_METHOD(set_lk_max_lockers, (u_int32_t max_lockers), (dbenv, max_lockers))
DBENV_METHOD(set_lk_max_locks, (u_int32_t max_locks), (dbenv, max_locks))
DBENV_METHOD(set_lk_max_objects, (u_int32_t max_objects), (dbenv, max_objects))
DBENV_METHOD(set_mp_mmapsize, (size_t mmapsize), (dbenv, mmapsize))
DBENV_METHOD(set_tmp_dir, (const char *tmp_dir), (dbenv, tmp_dir))
DBENV_METHOD(set_tx_max, (u_int32_t tx_max), (dbenv, tx_max))

DBENV_METHOD_QUIET(set_alloc,
    (db_malloc_fcn_type malloc_fcn, db_realloc_fcn_type realloc_fcn,
    db_free_fcn_type free_fcn),
    (dbenv, malloc_fcn, realloc_fcn, free_fcn))

void DbEnv::set_app_private(void *value)
{
      unwrap(this)->app_private = value;
}

DBENV_METHOD(set_cachesize,
    (u_int32_t gbytes, u_int32_t bytes, int ncache),
    (dbenv, gbytes, bytes, ncache))

void DbEnv::set_errcall(void (*arg)(const char *, char *))
{
      DB_ENV *dbenv = unwrap(this);

      // XXX
      // We are casting from a function ptr declared with C++
      // linkage to one (same arg types) declared with C
      // linkage.  It's hard to imagine a pair of C/C++
      // compilers from the same vendor for which this
      // won't work.  Unfortunately, we can't use a
      // intercept function like the others since the
      // function does not have a (DbEnv*) as one of
      // the args.  If this causes trouble, we can pull
      // the same trick we use in Java, namely stuffing
      // a (DbEnv*) pointer into the prefix.  We're
      // avoiding this for the moment because it obfuscates.
      //
      (*(dbenv->set_errcall))(dbenv, (db_errcall_fcn_type)arg);
}

// Note: This actually behaves a bit like a static function,
// since DB_ENV.db_errcall has no information about which
// db_env triggered the call.  A user that has multiple DB_ENVs
// will simply not be able to have different streams for each one.
//
void DbEnv::set_error_stream(__DB_OSTREAMCLASS *stream)
{
      DB_ENV *dbenv = unwrap(this);

      error_stream_ = stream;
      dbenv->set_errcall(dbenv, (stream == 0) ? 0 :
                     _stream_error_function_c);
}

int DbEnv::set_feedback(void (*arg)(DbEnv *, int, int))
{
      DB_ENV *dbenv = unwrap(this);

      feedback_callback_ = arg;

      return ((*(dbenv->set_feedback))(dbenv, _feedback_intercept_c));
}

DBENV_METHOD(set_flags, (u_int32_t flags, int onoff), (dbenv, flags, onoff))
DBENV_METHOD(set_lk_conflicts, (u_int8_t *lk_conflicts, int lk_max),
    (dbenv, lk_conflicts, lk_max))

int DbEnv::set_paniccall(void (*arg)(DbEnv *, int))
{
      DB_ENV *dbenv = unwrap(this);

      paniccall_callback_ = arg;

      return ((*(dbenv->set_paniccall))(dbenv, _paniccall_intercept_c));
}

DBENV_METHOD(set_rpc_server,
    (void *cl, char *host, long tsec, long ssec, u_int32_t flags),
    (dbenv, cl, host, tsec, ssec, flags))
DBENV_METHOD(set_shm_key, (long shm_key), (dbenv, shm_key))
// Note: this changes from last_known_error_policy to error_policy()
DBENV_METHOD(set_tas_spins, (u_int32_t arg), (dbenv, arg))

int DbEnv::set_app_dispatch
    (int (*arg)(DbEnv *, Dbt *, DbLsn *, db_recops))
{
      DB_ENV *dbenv = unwrap(this);
      int ret;

      app_dispatch_callback_ = arg;
      if ((ret = (*(dbenv->set_app_dispatch))(dbenv,
          _app_dispatch_intercept_c)) != 0)
            DB_ERROR("DbEnv::set_app_dispatch", ret, error_policy());

      return (ret);
}

DBENV_METHOD(set_tx_timestamp, (time_t *timestamp), (dbenv, timestamp))
DBENV_METHOD(set_verbose, (u_int32_t which, int onoff), (dbenv, which, onoff))

int DbEnv::txn_begin(DbTxn *pid, DbTxn **tid, u_int32_t flags)
{
      DB_ENV *env = unwrap(this);
      DB_TXN *txn;
      int ret;

      ret = env->txn_begin(env, unwrap(pid), &txn, flags);
      if (DB_RETOK_STD(ret))
            *tid = new DbTxn(txn);
      else
            DB_ERROR("DbEnv::txn_begin", ret, error_policy());

      return (ret);
}

DBENV_METHOD(txn_checkpoint, (u_int32_t kbyte, u_int32_t min, u_int32_t flags),
    (dbenv, kbyte, min, flags))

int DbEnv::txn_recover(DbPreplist *preplist, long count,
    long *retp, u_int32_t flags)
{
      DB_ENV *dbenv = unwrap(this);
      DB_PREPLIST *c_preplist;
      long i;
      int ret;

      /*
       * We need to allocate some local storage for the
       * returned preplist, and that requires us to do
       * our own argument validation.
       */
      if (count <= 0)
            ret = EINVAL;
      else
            ret = __os_malloc(dbenv, sizeof(DB_PREPLIST) * count,
                &c_preplist);

      if (ret != 0) {
            DB_ERROR("DbEnv::txn_recover", ret, error_policy());
            return (ret);
      }

      if ((ret =
          dbenv->txn_recover(dbenv, c_preplist, count, retp, flags)) != 0) {
            __os_free(dbenv, c_preplist);
            DB_ERROR("DbEnv::txn_recover", ret, error_policy());
            return (ret);
      }

      for (i = 0; i < *retp; i++) {
            preplist[i].txn = new DbTxn();
            preplist[i].txn->imp_ = wrap(c_preplist[i].txn);
            memcpy(preplist[i].gid, c_preplist[i].gid,
                sizeof(preplist[i].gid));
      }

      __os_free(dbenv, c_preplist);

      return (0);
}

DBENV_METHOD(txn_stat, (DB_TXN_STAT **statp, u_int32_t flags),
    (dbenv, statp, flags))

int DbEnv::set_rep_transport(u_int32_t myid,
    int (*f_send)(DbEnv *, const Dbt *, const Dbt *, int, u_int32_t))
{
      DB_ENV *dbenv = unwrap(this);
      int ret;

      rep_send_callback_ = f_send;
      if ((ret = dbenv->set_rep_transport(dbenv,
          myid, _rep_send_intercept_c)) != 0)
            DB_ERROR("DbEnv::set_rep_transport", ret, error_policy());

      return (ret);
}

DBENV_METHOD(rep_elect,
    (int nsites, int pri, u_int32_t timeout, int *idp),
    (dbenv, nsites, pri, timeout, idp))

int DbEnv::rep_process_message(Dbt *control, Dbt *rec, int *idp)
{
      DB_ENV *dbenv = unwrap(this);
      int ret;

      ret = dbenv->rep_process_message(dbenv, control, rec, idp);
      if (!DB_RETOK_REPPMSG(ret))
            DB_ERROR("DbEnv::rep_process_message", ret, error_policy());

      return (ret);
}

DBENV_METHOD(rep_start,
    (Dbt *cookie, u_int32_t flags),
    (dbenv, (DBT *)cookie, flags))

DBENV_METHOD(rep_stat, (DB_REP_STAT **statp, u_int32_t flags),
    (dbenv, statp, flags))

DBENV_METHOD(set_rep_limit, (u_int32_t gbytes, u_int32_t bytes),
    (dbenv, gbytes, bytes))

DBENV_METHOD(set_timeout,
    (db_timeout_t timeout, u_int32_t flags),
    (dbenv, timeout, flags))

// static method
char *DbEnv::version(int *major, int *minor, int *patch)
{
      return (db_version(major, minor, patch));
}

// static method
DbEnv *DbEnv::wrap_DB_ENV(DB_ENV *dbenv)
{
      DbEnv *wrapped_env = get_DbEnv(dbenv);
      if (wrapped_env == NULL)
            wrapped_env = new DbEnv(dbenv, 0);
      return wrapped_env;
}

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