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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 the H5PL module.
*/
#ifndef _H5PLpublic_H
#define _H5PLpublic_H
/* Public headers needed by this file */
#include "H5public.h" /* Generic Functions */
/*******************/
/* Public Typedefs */
/*******************/
/* Special string to indicate no plugin loading.
*/
#define H5PL_NO_PLUGIN "::"
//! [H5PL_type_t_snip]
/**
* Plugin type (bit-position) used by the plugin library
*/
typedef enum H5PL_type_t {
H5PL_TYPE_ERROR = -1, /**< Error */
H5PL_TYPE_FILTER = 0, /**< Filter */
H5PL_TYPE_VOL = 1, /**< VOL driver */
H5PL_TYPE_NONE = 2 /**< Sentinel: This must be last! */
} H5PL_type_t;
//! [H5PL_type_t_snip]
/* Common dynamic plugin type flags used by the set/get_loading_state functions */
#define H5PL_FILTER_PLUGIN 0x0001
#define H5PL_VOL_PLUGIN 0x0002
#define H5PL_ALL_PLUGIN 0xFFFF
#ifdef __cplusplus
extern "C" {
#endif
/* plugin state */
/**
* \ingroup H5PL
* \brief Controls the loadability of dynamic plugin types
*
* \param[in] plugin_control_mask The list of dynamic plugin types to enable or disable.\n
* A plugin bit set to 0 (zero) prevents use of that dynamic plugin.\n
* A plugin bit set to 1 (one) enables use of that dynamic plugin.\n
* Setting \p plugin_control_mask to a negative value enables all dynamic
* plugin types.\n
* Setting \p plugin_control_mask to 0 (zero) disables all dynamic plugin\n
* types.
* \return \herr_t
*
* \details H5PLset_loading_state() uses one argument to enable or disable individual plugin types.
*
* \details The \p plugin_control_mask parameter is an encoded integer in which each bit controls a specific
* plugin type. Bit positions allocated to date are specified in \ref H5PL_type_t as follows:
* \snippet this H5PL_type_t_snip
*
* A plugin bit set to 0 (zero) prevents the use of the dynamic plugin type corresponding to that bit
* position. A plugin bit set to 1 (one) allows the use of that dynamic plugin type.
*
* All dynamic plugin types can be enabled by setting \p plugin_control_mask to a negative value. A
* value of 0 (zero) will disable all dynamic plugin types.
*
* The loading of external dynamic plugins can be controlled during runtime with an environment
* variable, \c HDF5_PLUGIN_PRELOAD. H5PLset_loading_state() inspects the \c HDF5_PLUGIN_PRELOAD
* environment variable every time it is called. If the environment variable is set to the special
* \c :: string, all dynamic plugins are disabled.
*
* \warning The environment variable \c HDF5_PLUGIN_PRELOAD controls the loading of dynamic plugin types at
* runtime. If it is set to disable all plugin types, then it will disable them for \Emph{all}
* running programs that access the same variable instance.
*
* \since 1.8.15
*
*/
H5_DLL herr_t H5PLset_loading_state(unsigned int plugin_control_mask);
/**
* \ingroup H5PL
* \brief Queries the loadability of dynamic plugin types
*
* \param[out] plugin_control_mask List of dynamic plugin types that are enabled or disabled.\n
* A plugin bit set to 0 (zero) indicates that that the dynamic plugin type is
* disabled.\n
* A plugin bit set to 1 (one) indicates that that the dynamic plugin type is
* enabled.\n
* If the value of \p plugin_control_mask is negative, all dynamic plugin types
* are enabled.\n
* If the value of \p plugin_control_mask is 0 (zero), all dynamic plugins
* are disabled.
* \return \herr_t
*
* \details H5PLget_loading_state() retrieves the bitmask that controls whether a certain type of plugins
* (e.g.: filters, VOL drivers) will be loaded by the HDF5 library.
*
* Bit positions allocated to date are specified in \ref H5PL_type_t as follows:
* \snippet this H5PL_type_t_snip
*
* \since 1.8.15
*
*/
H5_DLL herr_t H5PLget_loading_state(unsigned int *plugin_control_mask /*out*/);
/**
* \ingroup H5PL
* \brief Inserts a plugin path at the end of the plugin search path list
*
* \param[in] search_path A plugin path
* \return \herr_t
*
* \details H5PLappend() inserts a plugin path at the end of the plugin search path list.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLappend(const char *search_path);
/**
* \ingroup H5PL
* \brief Inserts a plugin path at the beginning of the plugin search path list
*
* \param[in] search_path A plugin path
* \return \herr_t
*
* \details H5PLprepend() inserts a plugin path at the end of the plugin search path list.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLprepend(const char *search_path);
/**
* \ingroup H5PL
* \brief Replaces the path at the specified index in the plugin search path list
*
* \param[in] search_path A plugin path
* \param[in] index Index
* \return \herr_t
*
* \details H5PLreplace() replaces a plugin path at the specified index in the plugin search path list.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLreplace(const char *search_path, unsigned int index);
/**
* \ingroup H5PL
* \brief Inserts a path at the specified index in the plugin search path list
*
* \param[in] search_path A plugin path
* \param[in] index Index
* \return \herr_t
*
* \details H5PLinsert() inserts a plugin path at the specified index in the plugin search path list,
* moving other paths after \p index.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLinsert(const char *search_path, unsigned int index);
/**
* \ingroup H5PL
* \brief Removes a plugin path at a specified index from the plugin search path list
*
* \param[in] index Index
* \return \herr_t
*
* \details H5PLremove() removes a plugin path at the specified \p index and compacts the plugin search path
* list.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLremove(unsigned int index);
/**
* \ingroup H5PL
* \brief Queries the plugin search path list at the specified index
*
* \param[in] index Index
* \param[out] path_buf Pathname
* \param[in] buf_size Size of \p path_buf
* \return Returns the length of the path, a non-negative value, if successful; otherwise returns a negative
* value.
*
* \details H5PLget() queries the plugin path at a specified index. If \p path_buf is non-NULL then it writes
* up to \p buf_size bytes into that buffer and always returns the length of the path name.
*
* If \p path_buf is NULL, this function will simply return the number of characters required to
* store the path name, ignoring \p path_buf and \p buf_size.
*
* If an error occurs then the buffer pointed to by \p path_buf (NULL or non-NULL) is unchanged and
* the function returns a negative value. If a zero is returned for the name's length, then there is
* no path name associated with the index. and the \p path_buf buffer will be unchanged.
*
* \since 1.10.1
*
*/
H5_DLL ssize_t H5PLget(unsigned int index, char *path_buf /*out*/, size_t buf_size);
/**
* \ingroup H5PL
* \brief Retrieves the number of stored plugin paths
*
* \param[out] num_paths Current length of the plugin search path list
* \return \herr_t
*
* \details H5PLsize() retrieves the number of paths stored in the plugin search path list.
*
* \since 1.10.1
*
*/
H5_DLL herr_t H5PLsize(unsigned int *num_paths /*out*/);
#ifdef __cplusplus
}
#endif
#endif /* _H5PLpublic_H */
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