Viewing file:  apr_dbm.h (8.62 KB) -rw-rw-rw-
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef APR_DBM_H
#define APR_DBM_H
#include "apu.h"
#include "apr.h"
#include "apr_errno.h"
#include "apr_pools.h"
#include "apr_file_info.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @file apr_dbm.h
* @brief APR-UTIL DBM library
*/
/**
* @defgroup APR_Util_DBM DBM routines
* @ingroup APR_Util
* @{
*/
/**
* Structure for referencing a dbm
*/
typedef struct apr_dbm_t apr_dbm_t;
/**
* Structure for referencing the datum record within a dbm
*/
typedef struct
{
/** pointer to the 'data' to retrieve/store in the DBM */
char *dptr;
/** size of the 'data' to retrieve/store in the DBM */
apr_size_t dsize;
} apr_datum_t;
/* modes to open the DB */
#define APR_DBM_READONLY 1 /**< open for read-only access */
#define APR_DBM_READWRITE 2 /**< open for read-write access */
#define APR_DBM_RWCREATE 3 /**< open for r/w, create if needed */
#define APR_DBM_RWTRUNC 4 /**< open for r/w, truncating an existing
DB if present */
/**
* Open a dbm file by file name and type of DBM
* @param dbm The newly opened database
* @param type The type of the DBM (not all may be available at run time)
* <pre>
* db for Berkeley DB files
* gdbm for GDBM files
* ndbm for NDBM files
* sdbm for SDBM files (always available)
* default for the default DBM type
* </pre>
* @param name The dbm file name to open
* @param mode The flag value
* <PRE>
* APR_DBM_READONLY open for read-only access
* APR_DBM_READWRITE open for read-write access
* APR_DBM_RWCREATE open for r/w, create if needed
* APR_DBM_RWTRUNC open for r/w, truncate if already there
* </PRE>
* @param perm Permissions to apply to if created
* @param cntxt The pool to use when creating the dbm
* @remark The dbm name may not be a true file name, as many dbm packages
* append suffixes for seperate data and index files.
* @bug In apr-util 0.9 and 1.x, the type arg was case insensitive. This
* was highly inefficient, and as of 2.x the dbm name must be provided in
* the correct case (lower case for all bundled providers)
*/
APU_DECLARE(apr_status_t) apr_dbm_open_ex(apr_dbm_t **dbm, const char* type,
const char *name,
apr_int32_t mode, apr_fileperms_t perm,
apr_pool_t *cntxt);
/**
* Open a dbm file by file name
* @param dbm The newly opened database
* @param name The dbm file name to open
* @param mode The flag value
* <PRE>
* APR_DBM_READONLY open for read-only access
* APR_DBM_READWRITE open for read-write access
* APR_DBM_RWCREATE open for r/w, create if needed
* APR_DBM_RWTRUNC open for r/w, truncate if already there
* </PRE>
* @param perm Permissions to apply to if created
* @param cntxt The pool to use when creating the dbm
* @remark The dbm name may not be a true file name, as many dbm packages
* append suffixes for seperate data and index files.
*/
APU_DECLARE(apr_status_t) apr_dbm_open(apr_dbm_t **dbm, const char *name,
apr_int32_t mode, apr_fileperms_t perm,
apr_pool_t *cntxt);
/**
* Close a dbm file previously opened by apr_dbm_open
* @param dbm The database to close
*/
APU_DECLARE(void) apr_dbm_close(apr_dbm_t *dbm);
/**
* Fetch a dbm record value by key
* @param dbm The database
* @param key The key datum to find this record
* @param pvalue The value datum retrieved for this record
*/
APU_DECLARE(apr_status_t) apr_dbm_fetch(apr_dbm_t *dbm, apr_datum_t key,
apr_datum_t *pvalue);
/**
* Store a dbm record value by key
* @param dbm The database
* @param key The key datum to store this record by
* @param value The value datum to store in this record
*/
APU_DECLARE(apr_status_t) apr_dbm_store(apr_dbm_t *dbm, apr_datum_t key,
apr_datum_t value);
/**
* Delete a dbm record value by key
* @param dbm The database
* @param key The key datum of the record to delete
* @remark It is not an error to delete a non-existent record.
*/
APU_DECLARE(apr_status_t) apr_dbm_delete(apr_dbm_t *dbm, apr_datum_t key);
/**
* Search for a key within the dbm
* @param dbm The database
* @param key The datum describing a key to test
*/
APU_DECLARE(int) apr_dbm_exists(apr_dbm_t *dbm, apr_datum_t key);
/**
* Retrieve the first record key from a dbm
* @param dbm The database
* @param pkey The key datum of the first record
*/
APU_DECLARE(apr_status_t) apr_dbm_firstkey(apr_dbm_t *dbm, apr_datum_t *pkey);
/**
* Retrieve the next record key from a dbm
* @param dbm The database
* @param pkey The key datum of the next record
*/
APU_DECLARE(apr_status_t) apr_dbm_nextkey(apr_dbm_t *dbm, apr_datum_t *pkey);
/**
* Proactively toss any memory associated with the apr_datum_t.
* @param dbm The database
* @param data The datum to free.
*/
APU_DECLARE(void) apr_dbm_freedatum(apr_dbm_t *dbm, apr_datum_t data);
/**
* Report more information when an apr_dbm function fails.
* @param dbm The database
* @param errcode A DBM-specific value for the error (for logging). If this
* isn't needed, it may be NULL.
* @param errbuf Location to store the error text
* @param errbufsize The size of the provided buffer
* @return The errbuf parameter, for convenience.
*/
APU_DECLARE(char *) apr_dbm_geterror(apr_dbm_t *dbm, int *errcode,
char *errbuf, apr_size_t errbufsize);
/**
* If the specified file/path were passed to apr_dbm_open(), return the
* actual file/path names which would be (created and) used. At most, two
* files may be used; used2 may be NULL if only one file is used.
* @param pool The pool for allocating used1 and used2.
* @param type The type of DBM you require info on @see apr_dbm_open_ex
* @param pathname The path name to generate used-names from.
* @param used1 The first pathname used by the apr_dbm implementation.
* @param used2 The second pathname used by apr_dbm. If only one file is
* used by the specific implementation, this will be set to NULL.
* @return An error if the specified type is invalid.
* @remark The dbm file(s) don't need to exist. This function only manipulates
* the pathnames.
*/
APU_DECLARE(apr_status_t) apr_dbm_get_usednames_ex(apr_pool_t *pool,
const char *type,
const char *pathname,
const char **used1,
const char **used2);
/**
* If the specified file/path were passed to apr_dbm_open(), return the
* actual file/path names which would be (created and) used. At most, two
* files may be used; used2 may be NULL if only one file is used.
* @param pool The pool for allocating used1 and used2.
* @param pathname The path name to generate used-names from.
* @param used1 The first pathname used by the apr_dbm implementation.
* @param used2 The second pathname used by apr_dbm. If only one file is
* used by the specific implementation, this will be set to NULL.
* @remark The dbm file(s) don't need to exist. This function only manipulates
* the pathnames.
*/
APU_DECLARE(void) apr_dbm_get_usednames(apr_pool_t *pool,
const char *pathname,
const char **used1,
const char **used2);
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* !APR_DBM_H */
|