win10_lmdbbug_20180505.c

//$ sudo apt install iblmdb-dev
//$ gcc -o tst win10bug.c -llmdb

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "lmdb.h"


static int test1(MDB_env *env)
{
    int         retval;
    MDB_txn     *txn;
    MDB_dbi     dbi;
    MDB_val     key;
    MDB_val     data;

    retval = mdb_txn_begin(env, NULL, 0, &txn);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        goto LABEL_EXIT;
    }
    retval = mdb_dbi_open(txn, "test1", MDB_CREATE, &dbi);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        mdb_txn_abort(txn);
        goto LABEL_EXIT;
    }

    key.mv_size = 5;
    key.mv_data = "test1";
    data.mv_size = 5;
    data.mv_data = "TEST1";
    retval = mdb_put(txn, dbi, &key, &data, 0);
    if (retval == 0) {
        fprintf(stderr, "%s(): OK\n", __func__);
    } else {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
    }

    retval = mdb_txn_commit(txn);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
    }

LABEL_EXIT:
    return retval;
}


static int test2(MDB_env *env)
{
    int         retval;
    MDB_txn     *txn;
    MDB_dbi     dbi;
    MDB_val     key;
    MDB_val     data;

    retval = mdb_txn_begin(env, NULL, 0, &txn);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        goto LABEL_EXIT;
    }
    retval = mdb_dbi_open(txn, "test1", 0, &dbi);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        mdb_txn_abort(txn);
        goto LABEL_EXIT;
    }

    key.mv_size = 5;
    key.mv_data = "test1";
    retval = mdb_get(txn, dbi, &key, &data);
    mdb_txn_commit(txn);
    if (retval == 0) {
        fprintf(stderr, "%s(): OK\n", __func__);

        char *keyname = (char *)malloc(key.mv_size + 1);
        memcpy(keyname, key.mv_data, key.mv_size);
        keyname[key.mv_size] = '\0';

        char *dataname = (char *)malloc(data.mv_size + 1);
        memcpy(dataname, data.mv_data, data.mv_size);
        dataname[data.mv_size] = '\0';

        printf("  key(%lu)=%s, data(%lu)=%s\n", key.mv_size, keyname, data.mv_size, dataname);

        free(dataname);
        free(keyname);
    } else {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
    }

LABEL_EXIT:
    return retval;
}


int main(void)
{
    int         retval;
    MDB_env     *env = NULL;

    retval = mdb_env_create(&env);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        goto LABEL_EXIT;
    }

    retval = mdb_env_set_maxdbs(env, 1);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        goto LABEL_EXIT;
    }

    mkdir("testdb", 0755);
    retval = mdb_env_open(env, "testdb", 0, 0644);
    if (retval != 0) {
        fprintf(stderr, "ERR(%u): %s\n", __LINE__, mdb_strerror(retval));
        goto LABEL_EXIT;
    }

    retval = test1(env);
    if (retval != 0) {
        goto LABEL_EXIT;
    }

    //mdb_env_sync(env, 1);

    retval = test2(env);
    if (retval != 0) {
        goto LABEL_EXIT;
    }

LABEL_EXIT:
    mdb_env_close(env);
    return retval;
}