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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Francois Rouaix, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
/* $Id: dbstubs.c,v 1.1.1.1 2002/10/01 00:10:14 yminsky Exp $ */
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/fail.h>
#include <caml/callback.h>
#include <sys/types.h>
#include <limits.h>
#include <db.h>
/* O_CREAT and others are not defined in db.h */
#include <fcntl.h>
#include <string.h>
#include "dbstubs.h"
/* This MUST be in the same order as in dbm.mli
* We take a minimum (check O_NONBLOCK ?)
*/
static int db_open_flags[] = {
O_CREAT, O_EXCL, O_RDONLY, O_RDWR, O_TRUNC
};
/* R_IAFTER, R_IBEFORE, , R_RECNOSYNC : not relevant for btrees */
static int db_other_flags[] = {
};
/* Exception bucket for Db.error */
static value *caml_db_exn = NULL;
void raise_db(errmsg)
char *errmsg;
{
raise_with_string(*caml_db_exn, errmsg);
}
value caml_open_dbenv(value name) {
DB *dbp;
int err;
err = db_env_create(&dbenv,0);
if (err != 0) { printf(raise_db("db_env_create error: ")); }
err = dbenv->open(dbenv,
DIRNAME,
DB_CREATE | DB_INIT_MPOOL,
S_IRUSR | S_IWUSR );
if (err != 0) { raise_db("dbenv open error: "); }
camldbenv {
}
}
/* Finalisation function : occurs once at most !*/
int caml_db_close_internal(value cdb)
{
/* close the db if needed */
// DB_ENV dbenv;
// DBENV->close(&dbenv,0);
if (!Camldb_closed(cdb)) {
Camldb_closed(cdb) = 1;
return Camldb_db(cdb)->close(Camldb_db(cdb));
}
else
return 0;
}
static void caml_db_free(value cdb)
{
/* close the db if needed */
caml_db_close_internal(cdb);
/* free the structure */
// stat_free((void *)Camldb_info(cdb));
}
/*
* The primitives
*/
value caml_db_close(value cdb) /* ML */
{
if (caml_db_close_internal(cdb) == 0)
return Val_unit;
else
raise_db("close");
}
value caml_db_del(value cdb, value key, value vflags) /* ML */
{
/* Note: we could check that db is still open */
DBT dbt;
int flags;
Assert(Is_string(key));
dbt.data = String_val(key);
dbt.size = string_length(key);
flags = convert_flag_list(vflags, db_other_flags);
if ( 0 == Camldb_db(cdb)->del(Camldb_db(cdb), &dbt, flags))
return Val_unit;
else
raise_db("del");
}
/* fd: is said to be obsolete */
value caml_db_get(value cdb, value vkey, value vflags) /* ML */
{
DBT key;
DBT data;
int flags;
key.data = String_val(vkey);
key.size = string_length(vkey);
flags = convert_flag_list(vflags, db_other_flags);
switch (Camldb_db(cdb)->get(Camldb_db(cdb), &key, &data, flags)) {
case 0: /* success */
{
value res = alloc_string(data.size);
memmove (String_val (res), data.data, data.size);
return res;
}
case 1: /* not found */
raise_not_found();
default:
raise_db("get");
}
}
value caml_db_put(value cdb, value vkey, value vdata, value vflags) /* ML */
{
DBT key;
DBT data;
int flags;
key.data = String_val(vkey);
key.size = string_length(vkey);
data.data = String_val(vdata);
data.size = string_length(vdata);
flags = convert_flag_list(vflags, db_other_flags);
switch (Camldb_db(cdb)->put(Camldb_db(cdb), &key, &data, flags)) {
case 0: /* success */
return Val_unit;
case 1: /* R_NOOVERWRITE + exists */
raise_db("Entry already exists");
default:
raise_db("put");
}
}
value caml_db_seq(value cdb, value vkey, value vflags) /* ML */
{
DBT key;
DBT data;
int flags;
key.data = String_val(vkey);
key.size = string_length(vkey);
flags = convert_flag_list(vflags, db_other_flags);
switch (Camldb_db(cdb)->seq(Camldb_db(cdb), &key, &data, flags)) {
case 0: /* success */
{
value reskey = Val_unit, resdata = Val_unit, res = Val_unit;
Begin_roots3(reskey, resdata, res);
reskey = alloc_string(key.size);
resdata = alloc_string(data.size);
res = alloc_small(2, 0);
memmove (String_val (reskey), key.data, key.size);
memmove (String_val (resdata), data.data, data.size);
Field(res, 0) = reskey;
Field(res, 1) = resdata;
End_roots();
return res;
}
case 1:
raise_not_found();
default:
raise_db("seq");
}
}
value caml_db_sync(value cdb) /* ML */
{
if (0 == Camldb_db(cdb)->sync(Camldb_db(cdb), 0))
return Val_unit;
else
raise_db("sync");
}
value caml_db_open(value vfile, value vflags, value vmode, value vpars) /* ML */
{
char *file = String_val(vfile);
int flags = convert_flag_list(vflags, db_open_flags);
int mode = Int_val(vmode);
BTREEINFO *info;
DB *db;
/* Infos for btree structure : 0 is default everywhere */
info = stat_alloc(sizeof(BTREEINFO));
bzero(info, sizeof(BTREEINFO));
while (Is_block(vpars)) {
value par = Field(vpars, 0);
if (Is_block(par)) { /* It's a non-constant constructor */
switch(Tag_val(par)) {
case 0: /* Cachesize */
info->cachesize = Int_val(Field(par, 0));
default:
break;
}
} else { /* It's a constant constructor */
switch (Int_val(par)) {
case 0: /* Duplicates */
info->flags |= R_DUP;
break;
default:
break;
}
}
vpars = Field(vpars, 1);
}
db = dbopen(file,flags,mode,DB_BTREE,info);
if (db == NULL) {
stat_free(info);
raise_db("Can't open file");
}
else {
/* Allocate our structure */
value res = alloc_final(Camldb_wosize, caml_db_free, 1, Max_dballoc);
Camldb_db(res) = db;
Camldb_closed(res) = 0;
// Camldb_info(res) = info;
return res;
}
}
/* Requires the following Caml code:
exception DBError of string
let _ = Callback.register_exception "dberror" (DBError "")
as well as a call to the init function.
*/
value caml_db_init(value v) /* ML */
{
if (caml_db_exn == NULL)
caml_db_exn = caml_named_value("dberror");
return Val_unit;
}
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