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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996,2007 Oracle. All rights reserved.
*
* $Id: ex_dbclient.c,v 12.5 2007/05/17 15:15:12 bostic Exp $
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <db.h>
#define DATABASE_HOME "database"
#define DATABASE "access.db"
int db_clientrun __P((DB_ENV *, const char *));
int ex_dbclient __P((const char *));
int ex_dbclient_run __P((const char *, FILE *, const char *, const char *));
int main __P((int, char *[]));
/*
* An example of a program creating/configuring a Berkeley DB environment.
*/
int
main(argc, argv)
int argc;
char *argv[];
{
const char *home;
if (argc != 2) {
fprintf(stderr, "Usage: %s hostname\n", argv[0]);
return (EXIT_FAILURE);
}
/*
* All of the shared database files live in DATABASE_HOME, but
* data files will live in CONFIG_DATA_DIR.
*/
home = DATABASE_HOME;
return (ex_dbclient_run(home,
stderr, argv[1], argv[0]) == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
int
ex_dbclient(host)
const char *host;
{
const char *home;
const char *progname = "ex_dbclient"; /* Program name. */
int ret;
/*
* All of the shared database files live in DATABASE_HOME, but
* data files will live in CONFIG_DATA_DIR.
*/
home = DATABASE_HOME;
if ((ret = ex_dbclient_run(home, stderr, host, progname)) != 0)
return (ret);
return (0);
}
int
ex_dbclient_run(home, errfp, host, progname)
const char *home, *host, *progname;
FILE *errfp;
{
DB_ENV *dbenv;
int ret, retry;
/*
* Create an environment object and initialize it for error
* reporting.
*/
if ((ret = db_env_create(&dbenv, DB_RPCCLIENT)) != 0) {
fprintf(errfp, "%s: %s\n", progname, db_strerror(ret));
return (1);
}
retry = 0;
retry:
while (retry < 5) {
/*
* Set the server host we are talking to.
*/
if ((ret = dbenv->set_rpc_server(dbenv, NULL, host, 10000,
10000, 0)) != 0) {
fprintf(stderr, "Try %d: DB_ENV->set_rpc_server: %s\n",
retry, db_strerror(ret));
retry++;
sleep(15);
} else
break;
}
if (retry >= 5) {
fprintf(stderr,
"DB_ENV->set_rpc_server: %s\n", db_strerror(ret));
dbenv->close(dbenv, 0);
return (1);
}
/*
* We want to specify the shared memory buffer pool cachesize,
* but everything else is the default.
*/
if ((ret = dbenv->set_cachesize(dbenv, 0, 64 * 1024, 0)) != 0) {
dbenv->err(dbenv, ret, "set_cachesize");
dbenv->close(dbenv, 0);
return (1);
}
/*
* We have multiple processes reading/writing these files, so
* we need concurrency control and a shared buffer pool, but
* not logging or transactions.
*/
if ((ret = dbenv->open(dbenv, home,
DB_CREATE | DB_INIT_LOCK | DB_INIT_MPOOL, 0)) != 0) {
dbenv->err(dbenv, ret, "environment open: %s", home);
dbenv->close(dbenv, 0);
if (ret == DB_NOSERVER)
goto retry;
return (1);
}
ret = db_clientrun(dbenv, progname);
printf("db_clientrun returned %d\n", ret);
if (ret == DB_NOSERVER)
goto retry;
/* Close the handle. */
if ((ret = dbenv->close(dbenv, 0)) != 0) {
fprintf(stderr, "DB_ENV->close: %s\n", db_strerror(ret));
return (1);
}
return (0);
}
int
db_clientrun(dbenv, progname)
DB_ENV *dbenv;
const char *progname;
{
DB *dbp;
DBT key, data;
u_int32_t len;
int ret;
char *p, *t, buf[1024], rbuf[1024];
/* Remove the previous database. */
/* Create and initialize database object, open the database. */
if ((ret = db_create(&dbp, dbenv, 0)) != 0) {
fprintf(stderr,
"%s: db_create: %s\n", progname, db_strerror(ret));
return (ret);
}
if ((ret = dbp->set_pagesize(dbp, 1024)) != 0) {
dbp->err(dbp, ret, "set_pagesize");
goto err1;
}
if ((ret = dbp->open(dbp,
NULL, DATABASE, NULL, DB_BTREE, DB_CREATE, 0664)) != 0) {
dbp->err(dbp, ret, "%s: open", DATABASE);
goto err1;
}
/*
* Insert records into the database, where the key is the user
* input and the data is the user input in reverse order.
*/
memset(&key, 0, sizeof(DBT));
memset(&data, 0, sizeof(DBT));
for (;;) {
printf("input> ");
fflush(stdout);
if (fgets(buf, sizeof(buf), stdin) == NULL)
break;
if ((len = strlen(buf)) <= 1)
continue;
for (t = rbuf, p = buf + (len - 2); p >= buf;)
*t++ = *p--;
*t++ = '\0';
key.data = buf;
data.data = rbuf;
data.size = key.size = len - 1;
switch (ret =
dbp->put(dbp, NULL, &key, &data, DB_NOOVERWRITE)) {
case 0:
break;
default:
dbp->err(dbp, ret, "DB->put");
if (ret != DB_KEYEXIST)
goto err1;
break;
}
memset(&data, 0, sizeof(DBT));
switch (ret = dbp->get(dbp, NULL, &key, &data, 0)) {
case 0:
printf("%.*s : %.*s\n",
(int)key.size, (char *)key.data,
(int)data.size, (char *)data.data);
break;
default:
dbp->err(dbp, ret, "DB->get");
break;
}
}
if ((ret = dbp->close(dbp, 0)) != 0) {
fprintf(stderr,
"%s: DB->close: %s\n", progname, db_strerror(ret));
return (1);
}
return (0);
err1: (void)dbp->close(dbp, 0);
return (ret);
}
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