NAME

       hwlocality_xmlexport - Exporting Topologies to XML

SYNOPSIS

   Enumerations
       enum hwloc_topology_export_xml_flags_e { HWLOC_TOPOLOGY_EXPORT_XML_FLAG_V1 }

   Functions
       int hwloc_topology_export_xml (hwloc_topology_t topology, const char *xmlpath, unsigned
           long flags)
       int hwloc_topology_export_xmlbuffer (hwloc_topology_t topology, char **xmlbuffer, int
           *buflen, unsigned long flags)
       void hwloc_free_xmlbuffer (hwloc_topology_t topology, char *xmlbuffer)
       void hwloc_topology_set_userdata_export_callback (hwloc_topology_t topology,
           void(*export_cb)(void *reserved, hwloc_topology_t topology, hwloc_obj_t obj))
       int hwloc_export_obj_userdata (void *reserved, hwloc_topology_t topology, hwloc_obj_t obj,
           const char *name, const void *buffer, size_t length)
       int hwloc_export_obj_userdata_base64 (void *reserved, hwloc_topology_t topology,
           hwloc_obj_t obj, const char *name, const void *buffer, size_t length)
       void hwloc_topology_set_userdata_import_callback (hwloc_topology_t topology,
           void(*import_cb)(hwloc_topology_t topology, hwloc_obj_t obj, const char *name, const
           void *buffer, size_t length))

Detailed Description

Enumeration Type Documentation

   enum hwloc_topology_export_xml_flags_e
       Flags for exporting XML topologies. Flags to be given as a OR'ed set to
       hwloc_topology_export_xml().

       Enumerator

       HWLOC_TOPOLOGY_EXPORT_XML_FLAG_V1
              Export XML that is loadable by hwloc v1.x. However, the export may miss some
              details about the topology.

Function Documentation

   int hwloc_export_obj_userdata (void * reserved, hwloc_topology_t topology, hwloc_obj_t obj,
       const char * name, const void * buffer, size_t length)
       Export some object userdata to XML. This function may only be called from within the
       export() callback passed to hwloc_topology_set_userdata_export_callback(). It may be
       invoked one of multiple times to export some userdata to XML. The buffer content of length
       length is stored with optional name name.

       When importing this XML file, the import() callback (if set) will be called exactly as
       many times as hwloc_export_obj_userdata() was called during export(). It will receive the
       corresponding name, buffer and length arguments.

       reserved, topology and obj must be the first three parameters that were given to the
       export callback.

       Only printable characters may be exported to XML string attributes.

       If exporting binary data, the application should first encode into printable characters
       only (or use hwloc_export_obj_userdata_base64()). It should also take care of portability
       issues if the export may be reimported on a different architecture.

       Returns
           0 on success.

           -1 with errno set to EINVAL if a non-printable character is passed in name or buffer.

   int hwloc_export_obj_userdata_base64 (void * reserved, hwloc_topology_t topology, hwloc_obj_t
       obj, const char * name, const void * buffer, size_t length)
       Encode and export some object userdata to XML. This function is similar to
       hwloc_export_obj_userdata() but it encodes the input buffer into printable characters
       before exporting. On import, decoding is automatically performed before the data is given
       to the import() callback if any.

       This function may only be called from within the export() callback passed to
       hwloc_topology_set_userdata_export_callback().

       The name must be made of printable characters for export to XML string attributes.

       The function does not take care of portability issues if the export may be reimported on a
       different architecture.

       Returns
           0 on success.

           -1 with errno set to EINVAL if a non-printable character is passed in name.

   void hwloc_free_xmlbuffer (hwloc_topology_t topology, char * xmlbuffer)
       Free a buffer allocated by hwloc_topology_export_xmlbuffer()

   int hwloc_topology_export_xml (hwloc_topology_t topology, const char * xmlpath, unsigned long
       flags)
       Export the topology into an XML file. This file may be loaded later through
       hwloc_topology_set_xml().

       By default, the latest export format is used, which means older hwloc releases (e.g. v1.x)
       will not be able to import it. Exporting to v1.x specific XML format is possible using
       flag HWLOC_TOPOLOGY_EXPORT_XML_FLAG_V1 but it may miss some details about the topology. If
       there is any chance that the exported file may ever be imported back by a process using
       hwloc 1.x, one should consider detecting it at runtime and using the corresponding export
       format.

       flags is a OR'ed set of hwloc_topology_export_xml_flags_e.

       Returns
           0 on success, or -1 on error.

       Note
           See also hwloc_topology_set_userdata_export_callback() for exporting application-
           specific object userdata.

           The topology-specific userdata pointer is ignored when exporting to XML.

           Only printable characters may be exported to XML string attributes. Any other
           character, especially any non-ASCII character, will be silently dropped.

           If name is '-', the XML output is sent to the standard output.

   int hwloc_topology_export_xmlbuffer (hwloc_topology_t topology, char ** xmlbuffer, int *
       buflen, unsigned long flags)
       Export the topology into a newly-allocated XML memory buffer. xmlbuffer is allocated by
       the callee and should be freed with hwloc_free_xmlbuffer() later in the caller.

       This memory buffer may be loaded later through hwloc_topology_set_xmlbuffer().

       By default, the latest export format is used, which means older hwloc releases (e.g. v1.x)
       will not be able to import it. Exporting to v1.x specific XML format is possible using
       flag HWLOC_TOPOLOGY_EXPORT_XML_FLAG_V1 but it may miss some details about the topology. If
       there is any chance that the exported buffer may ever be imported back by a process using
       hwloc 1.x, one should consider detecting it at runtime and using the corresponding export
       format.

       The returned buffer ends with a \0 that is included in the returned length.

       flags is a OR'ed set of hwloc_topology_export_xml_flags_e.

       Returns
           0 on success, or -1 on error.

       Note
           See also hwloc_topology_set_userdata_export_callback() for exporting application-
           specific object userdata.

           The topology-specific userdata pointer is ignored when exporting to XML.

           Only printable characters may be exported to XML string attributes. Any other
           character, especially any non-ASCII character, will be silently dropped.

   void hwloc_topology_set_userdata_export_callback (hwloc_topology_t topology, void(*)(void
       *reserved, hwloc_topology_t topology, hwloc_obj_t obj) export_cb)
       Set the application-specific callback for exporting object userdata. The object userdata
       pointer is not exported to XML by default because hwloc does not know what it contains.

       This function lets applications set export_cb to a callback function that converts this
       opaque userdata into an exportable string.

       export_cb is invoked during XML export for each object whose userdata pointer is not NULL.
       The callback should use hwloc_export_obj_userdata() or hwloc_export_obj_userdata_base64()
       to actually export something to XML (possibly multiple times per object).

       export_cb may be set to NULL if userdata should not be exported to XML.

       Note
           The topology-specific userdata pointer is ignored when exporting to XML.

   void hwloc_topology_set_userdata_import_callback (hwloc_topology_t topology,
       void(*)(hwloc_topology_t topology, hwloc_obj_t obj, const char *name, const void *buffer,
       size_t length) import_cb)
       Set the application-specific callback for importing userdata. On XML import, userdata is
       ignored by default because hwloc does not know how to store it in memory.

       This function lets applications set import_cb to a callback function that will get the
       XML-stored userdata and store it in the object as expected by the application.

       import_cb is called during hwloc_topology_load() as many times as
       hwloc_export_obj_userdata() was called during export. The topology is not entirely setup
       yet. Object attributes are ready to consult, but links between objects are not.

       import_cb may be NULL if userdata should be ignored during import.

       Note
           buffer contains length characters followed by a null byte ('\0').

           This function should be called before hwloc_topology_load().

           The topology-specific userdata pointer is ignored when importing from XML.

Author

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