/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* This file contains public declarations for authoring VOL connectors.
*/
#ifndef _H5VLconnector_H
#define _H5VLconnector_H
/* Public headers needed by this file */
#include "H5public.h" /* Generic Functions */
#include "H5Apublic.h" /* Attributes */
#include "H5ESpublic.h" /* Event Stack */
#include "H5Fpublic.h" /* Files */
#include "H5Ipublic.h" /* IDs */
#include "H5Lpublic.h" /* Links */
#include "H5Opublic.h" /* Objects */
#include "H5Rpublic.h" /* References */
#include "H5VLpublic.h" /* Virtual Object Layer */
/*****************/
/* Public Macros */
/*****************/
/* Capability flags for connector */
#define H5VL_CAP_FLAG_NONE 0 /* No special connector capabilities */
#define H5VL_CAP_FLAG_THREADSAFE 0x01 /* Connector is threadsafe */
/* Container info version */
#define H5VL_CONTAINER_INFO_VERSION 0x01 /* Container info struct version */
/* The maximum size allowed for blobs */
#define H5VL_MAX_BLOB_ID_SIZE (16) /* Allow for 128-bits blob IDs */
/*******************/
/* Public Typedefs */
/*******************/
/* Enum type for each VOL subclass */
/* (Used for various queries, etc) */
typedef enum H5VL_subclass_t {
H5VL_SUBCLS_NONE, /* Operations outside of a subclass */
H5VL_SUBCLS_INFO, /* 'Info' subclass */
H5VL_SUBCLS_WRAP, /* 'Wrap' subclass */
H5VL_SUBCLS_ATTR, /* 'Attribute' subclass */
H5VL_SUBCLS_DATASET, /* 'Dataset' subclass */
H5VL_SUBCLS_DATATYPE, /* 'Named datatype' subclass */
H5VL_SUBCLS_FILE, /* 'File' subclass */
H5VL_SUBCLS_GROUP, /* 'Group' subclass */
H5VL_SUBCLS_LINK, /* 'Link' subclass */
H5VL_SUBCLS_OBJECT, /* 'Object' subclass */
H5VL_SUBCLS_REQUEST, /* 'Request' subclass */
H5VL_SUBCLS_BLOB, /* 'Blob' subclass */
H5VL_SUBCLS_TOKEN /* 'Token' subclass */
} H5VL_subclass_t;
/* types for attribute GET callback */
typedef enum H5VL_attr_get_t {
H5VL_ATTR_GET_ACPL, /* creation property list */
H5VL_ATTR_GET_INFO, /* info */
H5VL_ATTR_GET_NAME, /* access property list */
H5VL_ATTR_GET_SPACE, /* dataspace */
H5VL_ATTR_GET_STORAGE_SIZE, /* storage size */
H5VL_ATTR_GET_TYPE /* datatype */
} H5VL_attr_get_t;
/* types for attribute SPECFIC callback */
typedef enum H5VL_attr_specific_t {
H5VL_ATTR_DELETE, /* H5Adelete(_by_name/idx) */
H5VL_ATTR_EXISTS, /* H5Aexists(_by_name) */
H5VL_ATTR_ITER, /* H5Aiterate(_by_name) */
H5VL_ATTR_RENAME /* H5Arename(_by_name) */
} H5VL_attr_specific_t;
/* Typedef for VOL connector attribute optional VOL operations */
typedef int H5VL_attr_optional_t;
/* types for dataset GET callback */
typedef enum H5VL_dataset_get_t {
H5VL_DATASET_GET_DAPL, /* access property list */
H5VL_DATASET_GET_DCPL, /* creation property list */
H5VL_DATASET_GET_OFFSET, /* offset */
H5VL_DATASET_GET_SPACE, /* dataspace */
H5VL_DATASET_GET_SPACE_STATUS, /* space status */
H5VL_DATASET_GET_STORAGE_SIZE, /* storage size */
H5VL_DATASET_GET_TYPE /* datatype */
} H5VL_dataset_get_t;
/* types for dataset SPECFIC callback */
typedef enum H5VL_dataset_specific_t {
H5VL_DATASET_SET_EXTENT, /* H5Dset_extent */
H5VL_DATASET_FLUSH, /* H5Dflush */
H5VL_DATASET_REFRESH /* H5Drefresh */
} H5VL_dataset_specific_t;
/* Typedef for VOL connector dataset optional VOL operations */
typedef int H5VL_dataset_optional_t;
/* types for datatype GET callback */
typedef enum H5VL_datatype_get_t {
H5VL_DATATYPE_GET_BINARY, /* get serialized form of transient type */
H5VL_DATATYPE_GET_TCPL /* datatype creation property list */
} H5VL_datatype_get_t;
/* types for datatype SPECFIC callback */
typedef enum H5VL_datatype_specific_t {
H5VL_DATATYPE_FLUSH,
H5VL_DATATYPE_REFRESH
} H5VL_datatype_specific_t;
/* Typedef and values for native VOL connector named datatype optional VOL operations */
typedef int H5VL_datatype_optional_t;
/* (No optional named datatype VOL operations currently) */
/* types for file GET callback */
typedef enum H5VL_file_get_t {
H5VL_FILE_GET_CONT_INFO, /* file get container info */
H5VL_FILE_GET_FAPL, /* file access property list */
H5VL_FILE_GET_FCPL, /* file creation property list */
H5VL_FILE_GET_FILENO, /* file number */
H5VL_FILE_GET_INTENT, /* file intent */
H5VL_FILE_GET_NAME, /* file name */
H5VL_FILE_GET_OBJ_COUNT, /* object count in file */
H5VL_FILE_GET_OBJ_IDS /* object ids in file */
} H5VL_file_get_t;
/* types for file SPECIFIC callback */
typedef enum H5VL_file_specific_t {
H5VL_FILE_FLUSH, /* Flush file */
H5VL_FILE_REOPEN, /* Reopen the file */
H5VL_FILE_MOUNT, /* Mount a file */
H5VL_FILE_UNMOUNT, /* Unmount a file */
H5VL_FILE_IS_ACCESSIBLE, /* Check if a file is accessible */
H5VL_FILE_DELETE, /* Delete a file */
H5VL_FILE_IS_EQUAL /* Check if two files are the same */
} H5VL_file_specific_t;
/* Typedef for VOL connector file optional VOL operations */
typedef int H5VL_file_optional_t;
/* types for group GET callback */
typedef enum H5VL_group_get_t {
H5VL_GROUP_GET_GCPL, /* group creation property list */
H5VL_GROUP_GET_INFO /* group info */
} H5VL_group_get_t;
/* types for group SPECFIC callback */
typedef enum H5VL_group_specific_t {
H5VL_GROUP_FLUSH,
H5VL_GROUP_REFRESH
} H5VL_group_specific_t;
/* Typedef for VOL connector group optional VOL operations */
typedef int H5VL_group_optional_t;
/* link create types for VOL */
typedef enum H5VL_link_create_type_t {
H5VL_LINK_CREATE_HARD,
H5VL_LINK_CREATE_SOFT,
H5VL_LINK_CREATE_UD
} H5VL_link_create_type_t;
/* types for link GET callback */
typedef enum H5VL_link_get_t {
H5VL_LINK_GET_INFO, /* link info */
H5VL_LINK_GET_NAME, /* link name */
H5VL_LINK_GET_VAL /* link value */
} H5VL_link_get_t;
/* types for link SPECIFIC callback */
typedef enum H5VL_link_specific_t {
H5VL_LINK_DELETE, /* H5Ldelete(_by_idx) */
H5VL_LINK_EXISTS, /* link existence */
H5VL_LINK_ITER /* H5Literate/visit(_by_name) */
} H5VL_link_specific_t;
/* Typedef and values for native VOL connector link optional VOL operations */
typedef int H5VL_link_optional_t;
/* (No optional link VOL operations currently) */
/* types for object GET callback */
typedef enum H5VL_object_get_t {
H5VL_OBJECT_GET_FILE, /* object file */
H5VL_OBJECT_GET_NAME, /* object name */
H5VL_OBJECT_GET_TYPE, /* object type */
H5VL_OBJECT_GET_INFO /* H5Oget_info(_by_idx|name)3 */
} H5VL_object_get_t;
/* types for object SPECIFIC callback */
typedef enum H5VL_object_specific_t {
H5VL_OBJECT_CHANGE_REF_COUNT, /* H5Oincr/decr_refcount */
H5VL_OBJECT_EXISTS, /* H5Oexists_by_name */
H5VL_OBJECT_LOOKUP, /* Lookup object */
H5VL_OBJECT_VISIT, /* H5Ovisit(_by_name) */
H5VL_OBJECT_FLUSH, /* H5{D|G|O|T}flush */
H5VL_OBJECT_REFRESH /* H5{D|G|O|T}refresh */
} H5VL_object_specific_t;
/* Typedef for VOL connector object optional VOL operations */
typedef int H5VL_object_optional_t;
/* types for async request SPECIFIC callback */
typedef enum H5VL_request_specific_t {
H5VL_REQUEST_WAITANY, /* Wait until any request completes */
H5VL_REQUEST_WAITSOME, /* Wait until at least one requesst completes */
H5VL_REQUEST_WAITALL /* Wait until all requests complete */
} H5VL_request_specific_t;
/* Typedef and values for native VOL connector request optional VOL operations */
typedef int H5VL_request_optional_t;
/* (No optional request VOL operations currently) */
/* types for 'blob' SPECIFIC callback */
typedef enum H5VL_blob_specific_t {
H5VL_BLOB_DELETE, /* Delete a blob (by ID) */
H5VL_BLOB_GETSIZE, /* Get size of blob */
H5VL_BLOB_ISNULL, /* Check if a blob ID is "null" */
H5VL_BLOB_SETNULL /* Set a blob ID to the connector's "null" blob ID value */
} H5VL_blob_specific_t;
/* Typedef and values for native VOL connector blob optional VOL operations */
typedef int H5VL_blob_optional_t;
/* (No optional blob VOL operations currently) */
/* Types for different ways that objects are located in an HDF5 container */
typedef enum H5VL_loc_type_t {
H5VL_OBJECT_BY_SELF,
H5VL_OBJECT_BY_NAME,
H5VL_OBJECT_BY_IDX,
H5VL_OBJECT_BY_TOKEN
} H5VL_loc_type_t;
typedef struct H5VL_loc_by_name {
const char *name;
hid_t lapl_id;
} H5VL_loc_by_name_t;
typedef struct H5VL_loc_by_idx {
const char *name;
H5_index_t idx_type;
H5_iter_order_t order;
hsize_t n;
hid_t lapl_id;
} H5VL_loc_by_idx_t;
typedef struct H5VL_loc_by_token {
H5O_token_t *token;
} H5VL_loc_by_token_t;
/* Structure to hold parameters for object locations.
* Either: BY_SELF, BY_NAME, BY_IDX, BY_TOKEN
*
* Note: Leave loc_by_token as the first union member so we
* can perform the simplest initialization of the struct
* without raising warnings.
*
* Note: BY_SELF requires no union members.
*/
typedef struct H5VL_loc_params_t {
H5I_type_t obj_type;
H5VL_loc_type_t type;
union {
H5VL_loc_by_token_t loc_by_token;
H5VL_loc_by_name_t loc_by_name;
H5VL_loc_by_idx_t loc_by_idx;
} loc_data;
} H5VL_loc_params_t;
/* Info for H5VL_FILE_GET_CONT_INFO */
typedef struct H5VL_file_cont_info_t {
unsigned version; /* version information (keep first) */
uint64_t feature_flags; /* Container feature flags */
/* (none currently defined) */
size_t token_size; /* Size of tokens */
size_t blob_id_size; /* Size of blob IDs */
} H5VL_file_cont_info_t;
/* VOL connector info fields & callbacks */
typedef struct H5VL_info_class_t {
size_t size; /* Size of the VOL info */
void * (*copy)(const void *info); /* Callback to create a copy of the VOL info */
herr_t (*cmp)(int *cmp_value, const void *info1, const void *info2); /* Callback to compare VOL info */
herr_t (*free)(void *info); /* Callback to release a VOL info */
herr_t (*to_str)(const void *info, char **str); /* Callback to serialize connector's info into a string */
herr_t (*from_str)(const char *str, void **info); /* Callback to deserialize a string into connector's info */
} H5VL_info_class_t;
/* VOL object wrap / retrieval callbacks */
/* (These only need to be implemented by "pass through" VOL connectors) */
typedef struct H5VL_wrap_class_t {
void * (*get_object)(const void *obj); /* Callback to retrieve underlying object */
herr_t (*get_wrap_ctx)(const void *obj, void **wrap_ctx); /* Callback to retrieve the object wrapping context for the connector */
void * (*wrap_object)(void *obj, H5I_type_t obj_type, void *wrap_ctx); /* Callback to wrap a library object */
void * (*unwrap_object)(void *obj); /* Callback to unwrap a library object */
herr_t (*free_wrap_ctx)(void *wrap_ctx); /* Callback to release the object wrapping context for the connector */
} H5VL_wrap_class_t;
/* H5A routines */
typedef struct H5VL_attr_class_t {
void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id,
hid_t dxpl_id, void **req);
void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
hid_t aapl_id, hid_t dxpl_id, void **req);
herr_t (*read)(void *attr, hid_t mem_type_id, void *buf, hid_t dxpl_id, void **req);
herr_t (*write)(void *attr, hid_t mem_type_id, const void *buf, hid_t dxpl_id, void **req);
herr_t (*get)(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_attr_optional_t opt_type, hid_t dxpl_id,
void **req, va_list arguments);
herr_t (*close) (void *attr, hid_t dxpl_id, void **req);
} H5VL_attr_class_t;
/* H5D routines */
typedef struct H5VL_dataset_class_t {
void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
hid_t lcpl_id, hid_t type_id, hid_t space_id, hid_t dcpl_id,
hid_t dapl_id, hid_t dxpl_id, void **req);
void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
hid_t dapl_id, hid_t dxpl_id, void **req);
herr_t (*read)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
hid_t dxpl_id, void * buf, void **req);
herr_t (*write)(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id,
hid_t dxpl_id, const void * buf, void **req);
herr_t (*get)(void *obj, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, H5VL_dataset_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_dataset_optional_t opt_type, hid_t dxpl_id,
void **req, va_list arguments);
herr_t (*close) (void *dset, hid_t dxpl_id, void **req);
} H5VL_dataset_class_t;
/* H5T routines*/
typedef struct H5VL_datatype_class_t {
void *(*commit)(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t type_id,
hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char * name,
hid_t tapl_id, hid_t dxpl_id, void **req);
herr_t (*get) (void *obj, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, H5VL_datatype_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_datatype_optional_t opt_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*close) (void *dt, hid_t dxpl_id, void **req);
} H5VL_datatype_class_t;
/* H5F routines */
typedef struct H5VL_file_class_t {
void *(*create)(const char *name, unsigned flags, hid_t fcpl_id,
hid_t fapl_id, hid_t dxpl_id, void **req);
void *(*open)(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
herr_t (*get)(void *obj, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, H5VL_file_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_file_optional_t opt_type, hid_t dxpl_id,
void **req, va_list arguments);
herr_t (*close) (void *file, hid_t dxpl_id, void **req);
} H5VL_file_class_t;
/* H5G routines */
typedef struct H5VL_group_class_t {
void *(*create)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
hid_t lcpl_id, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
hid_t gapl_id, hid_t dxpl_id, void **req);
herr_t (*get)(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, H5VL_group_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_group_optional_t opt_type, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*close) (void *grp, hid_t dxpl_id, void **req);
} H5VL_group_class_t;
/* H5L routines */
typedef struct H5VL_link_class_t {
herr_t (*create)(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params,
hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req, va_list arguments);
herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1,
void *dst_obj, const H5VL_loc_params_t *loc_params2,
hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
herr_t (*move)(void *src_obj, const H5VL_loc_params_t *loc_params1,
void *dst_obj, const H5VL_loc_params_t *loc_params2,
hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_link_optional_t opt_type, hid_t dxpl_id,
void **req, va_list arguments);
} H5VL_link_class_t;
/* H5O routines */
typedef struct H5VL_object_class_t {
void *(*open)(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type,
hid_t dxpl_id, void **req);
herr_t (*copy)(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name,
void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name,
hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
herr_t (*get)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*specific)(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type,
hid_t dxpl_id, void **req, va_list arguments);
herr_t (*optional)(void *obj, H5VL_object_optional_t opt_type,
hid_t dxpl_id, void **req, va_list arguments);
} H5VL_object_class_t;
/* Asynchronous request 'notify' callback */
typedef herr_t (*H5VL_request_notify_t)(void *ctx, H5ES_status_t status);
/* "Levels" for 'get connector class' introspection callback */
typedef enum H5VL_get_conn_lvl_t {
H5VL_GET_CONN_LVL_CURR, /* Get "current" connector (for this object) */
H5VL_GET_CONN_LVL_TERM /* Get "terminal" connector (for this object) */
/* (Recursively called, for pass-through connectors) */
/* (Connectors that "split" must choose which connector to return) */
} H5VL_get_conn_lvl_t;
/* Forward declaration of H5VL_class_t, defined later in this file */
struct H5VL_class_t;
/* Container/connector introspection routines */
typedef struct H5VL_introspect_class_t {
herr_t (*get_conn_cls)(void *obj, H5VL_get_conn_lvl_t lvl, const struct H5VL_class_t **conn_cls);
herr_t (*opt_query)(void *obj, H5VL_subclass_t cls, int opt_type, hbool_t *supported);
} H5VL_introspect_class_t;
/* Async request operation routines */
typedef struct H5VL_request_class_t {
herr_t (*wait)(void *req, uint64_t timeout, H5ES_status_t *status);
herr_t (*notify)(void *req, H5VL_request_notify_t cb, void *ctx);
herr_t (*cancel)(void *req);
herr_t (*specific)(void *req, H5VL_request_specific_t specific_type, va_list arguments);
herr_t (*optional)(void *req, H5VL_request_optional_t opt_type, va_list arguments);
herr_t (*free)(void *req);
} H5VL_request_class_t;
/* 'blob' routines */
typedef struct H5VL_blob_class_t {
herr_t (*put)(void *obj, const void *buf, size_t size, void *blob_id, void *ctx);
herr_t (*get)(void *obj, const void *blob_id, void *buf, size_t size, void *ctx);
herr_t (*specific)(void *obj, void *blob_id, H5VL_blob_specific_t specific_type, va_list arguments);
herr_t (*optional)(void *obj, void *blob_id, H5VL_blob_optional_t opt_type, va_list arguments);
} H5VL_blob_class_t;
/* Object token routines */
typedef struct H5VL_token_class_t {
herr_t (*cmp)(void *obj, const H5O_token_t *token1, const H5O_token_t *token2, int *cmp_value);
herr_t (*to_str)(void *obj, H5I_type_t obj_type, const H5O_token_t *token, char **token_str);
herr_t (*from_str)(void *obj, H5I_type_t obj_type, const char *token_str, H5O_token_t *token);
} H5VL_token_class_t;
/* Class information for each VOL connector */
typedef struct H5VL_class_t {
/* Overall connector fields & callbacks */
unsigned int version; /* VOL connector class struct version # */
H5VL_class_value_t value; /* Value to identify connector */
const char *name; /* Connector name (MUST be unique!) */
unsigned cap_flags; /* Capability flags for connector */
herr_t (*initialize)(hid_t vipl_id); /* Connector initialization callback */
herr_t (*terminate)(void); /* Connector termination callback */
/* VOL framework */
H5VL_info_class_t info_cls; /* VOL info fields & callbacks */
H5VL_wrap_class_t wrap_cls; /* VOL object wrap / retrieval callbacks */
/* Data Model */
H5VL_attr_class_t attr_cls; /* Attribute (H5A*) class callbacks */
H5VL_dataset_class_t dataset_cls; /* Dataset (H5D*) class callbacks */
H5VL_datatype_class_t datatype_cls; /* Datatype (H5T*) class callbacks */
H5VL_file_class_t file_cls; /* File (H5F*) class callbacks */
H5VL_group_class_t group_cls; /* Group (H5G*) class callbacks */
H5VL_link_class_t link_cls; /* Link (H5L*) class callbacks */
H5VL_object_class_t object_cls; /* Object (H5O*) class callbacks */
/* Infrastructure / Services */
H5VL_introspect_class_t introspect_cls; /* Container/connector introspection class callbacks */
H5VL_request_class_t request_cls; /* Asynchronous request class callbacks */
H5VL_blob_class_t blob_cls; /* 'Blob' class callbacks */
H5VL_token_class_t token_cls; /* VOL connector object token class callbacks */
/* Catch-all */
herr_t (*optional)(void *obj, int op_type, hid_t dxpl_id, void **req, va_list arguments); /* Optional callback */
} H5VL_class_t;
/********************/
/* Public Variables */
/********************/
/*********************/
/* Public Prototypes */
/*********************/
#ifdef __cplusplus
extern "C" {
#endif
/* Helper routines for VOL connector authors */
H5_DLL hid_t H5VLregister_connector(const H5VL_class_t *cls, hid_t vipl_id);
H5_DLL void *H5VLobject(hid_t obj_id);
H5_DLL hid_t H5VLget_file_type(void *file_obj, hid_t connector_id,
hid_t dtype_id);
H5_DLL hid_t H5VLpeek_connector_id(const char *name);
#ifdef __cplusplus
}
#endif
#endif /* _H5VLconnector_H */