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Diffstat (limited to 'src/H5VLpublic.h')
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diff --git a/src/H5VLpublic.h b/src/H5VLpublic.h new file mode 100644 index 0000000..09b31af --- /dev/null +++ b/src/H5VLpublic.h @@ -0,0 +1,424 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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://www.hdfgroup.org/licenses. * + * If you do not have access to either file, you may request a copy from * + * help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/* + * This file contains public declarations for the H5VL (VOL) module. + */ + +#ifndef H5VLpublic_H +#define H5VLpublic_H + +/* Public headers needed by this file */ +#include "H5public.h" /* Generic Functions */ +#include "H5Ipublic.h" /* IDs */ + +/*****************/ +/* Public Macros */ +/*****************/ + +/** + * \ingroup H5VLDEF + * \brief Version # of VOL class struct & callbacks + * + * \details Each VOL connector must set the 'version' field in the H5VL_class_t + * struct to the version of the H5VL_class_t struct that the connector + * implements. The HDF5 library will reject connectors with + * incompatible structs. + */ +#define H5VL_VERSION 3 + +/* VOL connector identifier values + * These are H5VL_class_value_t values, NOT hid_t values! + */ +/** + * \ingroup H5VLDEF + * Invalid ID for VOL connector ID + */ +#define H5_VOL_INVALID (-1) +/** + * \ingroup H5VLDEF + * Native HDF5 file format VOL connector + */ +#define H5_VOL_NATIVE 0 +/** + * \ingroup H5VLDEF + * VOL connector IDs below this value are reserved for library use + */ +#define H5_VOL_RESERVED 256 +/** + * \ingroup H5VLDEF + * Maximum VOL connector ID + */ +#define H5_VOL_MAX 65535 + +/* + * Capability flags for VOL connectors + */ +#define H5VL_CAP_FLAG_NONE 0x0000000000000000 /**< No special connector capabilities */ +#define H5VL_CAP_FLAG_THREADSAFE 0x0000000000000001 /**< Connector is threadsafe */ +#define H5VL_CAP_FLAG_ASYNC 0x0000000000000002 /**< Connector performs operations asynchronously*/ +#define H5VL_CAP_FLAG_NATIVE_FILES 0x0000000000000004 /**< Connector produces native file format */ +#define H5VL_CAP_FLAG_ATTR_BASIC 0x0000000000000008 /**< H5A create/delete/exists/open/close/read/write */ +#define H5VL_CAP_FLAG_ATTR_MORE 0x0000000000000010 /**< All other H5A API calls */ +#define H5VL_CAP_FLAG_DATASET_BASIC 0x0000000000000020 /**< H5D create/open/close/read/write */ +#define H5VL_CAP_FLAG_DATASET_MORE 0x0000000000000040 /**< All other H5D API calls */ +#define H5VL_CAP_FLAG_FILE_BASIC 0x0000000000000080 /**< H5F create/open/close/read/write */ +#define H5VL_CAP_FLAG_FILE_MORE 0x0000000000000100 /**< All other H5F API calls */ +#define H5VL_CAP_FLAG_GROUP_BASIC 0x0000000000000200 /**< H5G create/open/close */ +#define H5VL_CAP_FLAG_GROUP_MORE 0x0000000000000400 /**< All other H5G API calls*/ +#define H5VL_CAP_FLAG_LINK_BASIC 0x0000000000000800 /**< H5L exists/delete */ +#define H5VL_CAP_FLAG_LINK_MORE 0x0000000000001000 /**< All other H5L API calls */ +#define H5VL_CAP_FLAG_MAP_BASIC \ + 0x0000000000002000 /**< H5M create/open/close/get*type/get_count/put/get/exists/delete */ +#define H5VL_CAP_FLAG_MAP_MORE 0x0000000000004000 /**< All other H5M API calls */ +#define H5VL_CAP_FLAG_OBJECT_BASIC 0x0000000000008000 /**< H5O open/close/exists */ +#define H5VL_CAP_FLAG_OBJECT_MORE 0x0000000000010000 /**< All other H5O API calls */ +#define H5VL_CAP_FLAG_REF_BASIC 0x0000000000020000 /**< H5Rdestroy */ +#define H5VL_CAP_FLAG_REF_MORE 0x0000000000040000 /**< All other H5R API calls */ +#define H5VL_CAP_FLAG_OBJ_REF 0x0000000000080000 /**< Connector supports object references */ +#define H5VL_CAP_FLAG_REG_REF 0x0000000000100000 /**< Connector supports regional references */ +#define H5VL_CAP_FLAG_ATTR_REF 0x0000000000200000 /**< Connector supports attribute references */ +#define H5VL_CAP_FLAG_STORED_DATATYPES 0x0000000000400000 /**< Connector supports stored datatypes */ +#define H5VL_CAP_FLAG_CREATION_ORDER 0x0000000000800000 /**< Connector tracks creation order */ +#define H5VL_CAP_FLAG_ITERATE 0x0000000001000000 /**< Connector supports iteration functions */ +#define H5VL_CAP_FLAG_STORAGE_SIZE 0x0000000002000000 /**< Connector can return a meaningful storage size */ +#define H5VL_CAP_FLAG_BY_IDX 0x0000000004000000 /**< "by index" API calls are supported */ +#define H5VL_CAP_FLAG_GET_PLIST \ + 0x0000000008000000 /**< Connector can return the property lists used to create an object */ +#define H5VL_CAP_FLAG_FLUSH_REFRESH 0x0000000010000000 /**< flush/refresh calls are supported */ +#define H5VL_CAP_FLAG_EXTERNAL_LINKS 0x0000000020000000 /**< External links are supported */ +#define H5VL_CAP_FLAG_HARD_LINKS 0x0000000040000000 /**< Hard links are supported */ +#define H5VL_CAP_FLAG_SOFT_LINKS 0x0000000080000000 /**< Soft links are supported */ +#define H5VL_CAP_FLAG_UD_LINKS 0x0000000100000000 /**< User-defined links are supported */ +#define H5VL_CAP_FLAG_TRACK_TIMES 0x0000000200000000 /**< Connector tracks creation, etc. times */ +#define H5VL_CAP_FLAG_MOUNT 0x0000000400000000 /**< H5Fmount/unmount supported */ +#define H5VL_CAP_FLAG_FILTERS 0x0000000800000000 /**< Connector implements a filter pipeline */ +#define H5VL_CAP_FLAG_FILL_VALUES 0x0000001000000000 /**< Connector allows fill values to be set */ + +/** + * \ingroup H5VLDEF + * + * Flags to return from H5VLquery_optional API and 'opt_query' callbacks + * + * \details Operations which access multiple objects' data or metadata in a + * container should be registered as file-level optional operations. + * (e.g. "H5Dwrite_multi" takes a list of datasets to write data to, so + * a VOL connector that implemented it should register it as an optional + * file operation, and pass-through VOL connectors that are stacked above + * the connector that registered it should assume that dataset elements + * for _any_ dataset in the file could be written to) + */ +#define H5VL_OPT_QUERY_SUPPORTED 0x0001 /**< VOL connector supports this operation */ +#define H5VL_OPT_QUERY_READ_DATA 0x0002 /**< Operation reads data for object */ +#define H5VL_OPT_QUERY_WRITE_DATA 0x0004 /**< Operation writes data for object */ +#define H5VL_OPT_QUERY_QUERY_METADATA 0x0008 /**< Operation reads metadata for object */ +#define H5VL_OPT_QUERY_MODIFY_METADATA 0x0010 /**< Operation modifies metadata for object */ +#define H5VL_OPT_QUERY_COLLECTIVE \ + 0x0020 /**< Operation is collective (operations without this flag are assumed to be independent) */ +#define H5VL_OPT_QUERY_NO_ASYNC 0x0040 /**< Operation may NOT be executed asynchronously */ +#define H5VL_OPT_QUERY_MULTI_OBJ 0x0080 /**< Operation involves multiple objects */ + +/*******************/ +/* Public Typedefs */ +/*******************/ + +/** + * \ingroup H5VLDEF + * + * \brief VOL connector identifiers. + * + * \details Values 0 through 255 are for connectors defined by the HDF5 + * library. Values 256 through 511 are available for testing new + * connectors. Subsequent values should be obtained from the HDF5 + * development team at mailto:help@hdfgroup.org. + */ +//! <!-- [H5VL_class_value_t_snip] --> +typedef int H5VL_class_value_t; +//! <!-- [H5VL_class_value_t_snip] --> + +/** + * \ingroup H5VLDEF + * \details 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 */ + /* NOTE: if more operations are added, the + * H5VL_opt_vals_g[] array size should be updated. + */ +} H5VL_subclass_t; + +/********************/ +/* Public Variables */ +/********************/ + +/*********************/ +/* Public Prototypes */ +/*********************/ + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \ingroup H5VL + * \brief Registers a new VOL connector by name + * + * \param[in] connector_name Connector name + * \vipl_id + * \return \hid_t{VOL connector} + * + * \details H5VLregister_connector_by_name() registers a new VOL connector with + * the name \p connector_name as a member of the virtual object layer + * class. This VOL connector identifier is good until the library is + * closed or the connector is unregistered. + * + * \p vipl_id is either #H5P_DEFAULT or the identifier of a VOL + * initialization property list of class #H5P_VOL_INITIALIZE created + * with H5Pcreate(). When created, this property list contains no + * library properties. If a VOL connector author decides that + * initialization-specific data are needed, they can be added to the + * empty list and retrieved by the connector in the VOL connector's + * initialize callback. Use of the VOL initialization property list is + * uncommon, as most VOL-specific properties are added to the file + * access property list via the connector's API calls which set the + * VOL connector for the file open/create. For more information, see + * \ref_vol_doc. + * + * \since 1.12.0 + * + */ +H5_DLL hid_t H5VLregister_connector_by_name(const char *connector_name, hid_t vipl_id); +/** + * \ingroup H5VL + * \brief Registers a new VOL connector by value + * + * \param[in] connector_value Connector value + * \vipl_id + * \return \hid_t{VOL connector} + * + * \details H5VLregister_connector_by_value() registers a new VOL connector + * with value connector_value as a member of the virtual object layer + * class. This VOL connector identifier is good until the library is + * closed or the connector is unregistered. + * + * \p connector_value has a type of H5VL_class_value_t, which is + * defined in H5VLpublic.h as follows: + * \snippet this H5VL_class_value_t_snip + * + * Valid VOL connector identifiers can have values from 0 through 255 + * for connectors defined by the HDF5 library. Values 256 through 511 + * are available for testing new connectors. Subsequent values should + * be obtained by contacting the The HDF Help Desk. + * + * \p vipl_id is either #H5P_DEFAULT or the identifier of a VOL + * initialization property list of class #H5P_VOL_INITIALIZE created + * with H5Pcreate(). When created, this property list contains no + * library properties. If a VOL connector author decides that + * initialization-specific data are needed, they can be added to the + * empty list and retrieved by the connector in the VOL connector's + * initialize callback. Use of the VOL initialization property list is + * uncommon, as most VOL-specific properties are added to the file + * access property list via the connector's API calls which set the + * VOL connector for the file open/create. For more information, see + * the \ref_vol_doc. + * + * \since 1.12.0 + * + */ +H5_DLL hid_t H5VLregister_connector_by_value(H5VL_class_value_t connector_value, hid_t vipl_id); +/** + * \ingroup H5VL + * \brief Tests whether a VOL class has been registered under a certain name + * + * \param[in] name Alleged name of connector + * \return \htri_t + * + * \details H5VLis_connector_registered_by_name() tests whether a VOL class has + * been registered or not, according to the supplied connector name + * \p name. + * + * \since 1.12.0 + */ +H5_DLL htri_t H5VLis_connector_registered_by_name(const char *name); +/** + * \ingroup H5VL + * \brief Tests whether a VOL class has been registered for a given value + * + * \param[in] connector_value Connector value + * \return \htri_t + * + * \details H5VLis_connector_registered_by_value() tests whether a VOL class + * has been registered, according to the supplied connector value \p + * connector_value. + * + * \p connector_value has a type of H5VL_class_value_t, which is + * defined in H5VLpublic.h as follows: + * \snippet this H5VL_class_value_t_snip + * + * Valid VOL connector identifiers can have values from 0 through 255 + * for connectors defined by the HDF5 library. Values 256 through 511 + * are available for testing new connectors. Subsequent values should + * be obtained by contacting the The HDF Help Desk. + * + * \since 1.12.0 + */ +H5_DLL htri_t H5VLis_connector_registered_by_value(H5VL_class_value_t connector_value); +/** + * \ingroup H5VL + * \brief Retrieves the VOL connector identifier for a given object identifier + * + * \obj_id + * \return \hid_t{VOL connector} + * + * \details H5VLget_connector_id() retrieves the registered VOL connector + * identifier for the specified object identifier \p obj_id. The VOL + * connector identifier must be closed with H5VLclose() when no longer + * in use. + * + * \since 1.12.0 + */ +H5_DLL hid_t H5VLget_connector_id(hid_t obj_id); +/** + * \ingroup H5VL + * \brief Retrieves the identifier for a registered VOL connector name + * + * \param[in] name Connector name + * \return \hid_t{VOL connector} + * + * \details H5VLget_connector_id_by_name() retrieves the identifier for a + * registered VOL connector with the name \p name. The identifier must + * be closed with H5VLclose() when no longer in use. + * + * \since 1.12.0 + */ +H5_DLL hid_t H5VLget_connector_id_by_name(const char *name); +/** + * \ingroup H5VL + * \brief Retrieves the identifier for a registered VOL connector value + * + * \param[in] connector_value Connector value + * \return \hid_t{VOL connector} + * + * \details H5VLget_connector_id_by_value() retrieves the identifier for a + * registered VOL connector with the value \p connector_value. The + * identifier will need to be closed by H5VLclose(). + * + * \p connector_value has a type of H5VL_class_value_t, which is + * defined in H5VLpublic.h as follows: + * \snippet this H5VL_class_value_t_snip + * + * Valid VOL connector identifiers can have values from 0 through 255 + * for connectors defined by the HDF5 library. Values 256 through 511 + * are available for testing new connectors. Subsequent values should + * be obtained by contacting the The HDF Help Desk. + * + * \since 1.12.0 + */ +H5_DLL hid_t H5VLget_connector_id_by_value(H5VL_class_value_t connector_value); +/** + * \ingroup H5VL + * \brief Retrieves a connector name for a VOL + * + * \obj_id{id} or file identifier + * \param[out] name Connector name + * \param[in] size Maximum length of the name to retrieve + * \return Returns the length of the connector name on success, and a negative value on failure. + * + * \details H5VLget_connector_name() retrieves up to \p size elements of the + * VOL name \p name associated with the object or file identifier \p + * id. + * + * Passing in a NULL pointer for size will return the size of the + * connector name. This can be used to determine the size of the + * buffer to allocate for the name. + * + * \since 1.12.0 + */ +H5_DLL ssize_t H5VLget_connector_name(hid_t id, char *name /*out*/, size_t size); +/** + * \ingroup H5VL + * \brief Closes a VOL connector identifier + * + * \param[in] connector_id Connector identifier + * \return \herr_t + * + * \details H5VLclose() closes a VOL connector identifier. This does not affect + * the file access property lists which have been defined to use this + * VOL connector or files which are already opened under this + * connector. + * + * \since 1.12.0 + */ +H5_DLL herr_t H5VLclose(hid_t connector_id); +/** + * \ingroup H5VL + * \brief Removes a VOL connector identifier from the library + * + * \param[in] connector_id Connector identifier + * \return \herr_t + * + * \details H5VLunregister_connector() removes a VOL connector identifier from + * the library. This does not affect the file access property lists + * which have been defined to use the VOL connector or any files which + * are already opened with this connector. + * + * \attention H5VLunregister_connector() will fail if attempting to unregister + * the native VOL connector. + * + * \since 1.12.0 + */ +H5_DLL herr_t H5VLunregister_connector(hid_t connector_id); +/** + * \ingroup H5VL + * \brief Determine if a VOL connector supports a particular + * optional callback operation. + * + * \obj_id + * \param[in] subcls VOL subclass + * \param[in] opt_type Option type + * \param[out] flags Operation flags + * \return \herr_t + * + * \since 1.12.1 + */ +H5_DLL herr_t H5VLquery_optional(hid_t obj_id, H5VL_subclass_t subcls, int opt_type, uint64_t *flags); +/** + * \ingroup H5VL + * \brief Determines whether an object ID represents a native + * VOL connector object. + * + * \obj_id + * \param[out] is_native Boolean determining whether object is a native VOL connector object + * \return \herr_t + * + * \since 1.12.2 + */ +H5_DLL herr_t H5VLobject_is_native(hid_t obj_id, hbool_t *is_native); + +#ifdef __cplusplus +} +#endif + +#endif /* H5VLpublic_H */ |