Hardware Locality (hwloc): Converting between Object Types and Attributes, and Strings

Hardware Locality (hwloc) 2.6.0

Functions
Converting between Object Types and Attributes, and Strings

## Functions
const char * | hwloc_obj_type_string (hwloc_obj_type_t type)
int | hwloc_obj_type_snprintf (char *restrict string, size_t size, hwloc_obj_t obj, int verbose)
int | hwloc_obj_attr_snprintf (char *restrict string, size_t size, hwloc_obj_t obj, const char *restrict separator, int verbose)
int | hwloc_type_sscanf (const char *string, hwloc_obj_type_t *typep, union hwloc_obj_attr_u *attrp, size_t attrsize)
int | hwloc_type_sscanf_as_depth (const char *string, hwloc_obj_type_t *typep, hwloc_topology_t topology, int *depthp)

## Detailed Description

## Function Documentation

## ◆ hwloc_obj_attr_snprintf()

int hwloc_obj_attr_snprintf | ( | char *restrict | string,
|  | size_t | size,
|  | hwloc_obj_t | obj,
|  | const char *restrict | separator,
|  | int | verbose
| ) |  |

Stringify the attributes of a given topology object into a human-readable form.

Attribute values are separated by `separator`.

Only the major attributes are printed in non-verbose mode.

If `size` is 0, `string` may safely be `NULL`.

Returns
  the number of character that were actually written if not truncating, or that would have been written (not including the ending \0).

## ◆ hwloc_obj_type_snprintf()

int hwloc_obj_type_snprintf | ( | char *restrict | string,
|  | size_t | size,
|  | hwloc_obj_t | obj,
|  | int | verbose
| ) |  |

Stringify the type of a given topology object into a human-readable form.

Contrary to hwloc_obj_type_string(), this function includes object-specific attributes (such as the Group depth, the Bridge type, or OS device type) in the output, and it requires the caller to provide the output buffer.

The output is guaranteed to be the same for all objects of a same topology level.

If `verbose` is 1, longer type names are used, e.g. L1Cache instead of L1.

The output string may be parsed back by hwloc_type_sscanf().

If `size` is 0, `string` may safely be `NULL`.

Returns
  the number of character that were actually written if not truncating, or that would have been written (not including the ending \0).

## ◆ hwloc_obj_type_string()

const char* hwloc_obj_type_string | ( | hwloc_obj_type_t | type | ) |

Return a constant stringified object type.

This function is the basic way to convert a generic type into a string. The output string may be parsed back by hwloc_type_sscanf().

hwloc_obj_type_snprintf() may return a more precise output for a specific object, but it requires the caller to provide the output buffer.

## ◆ hwloc_type_sscanf()

int hwloc_type_sscanf | ( | const char * | string,
|  | hwloc_obj_type_t * | typep,
|  | union hwloc_obj_attr_u * | attrp,
|  | size_t | attrsize
| ) |  |

Return an object type and attributes from a type string.

Convert strings such as "Package" or "L1iCache" into the corresponding types. Matching is case-insensitive, and only the first letters are actually required to match.

The matched object type is set in `typep` (which cannot be `NULL`).

Type-specific attributes, for instance Cache type, Cache depth, Group depth, Bridge type or OS Device type may be returned in `attrp`. Attributes that are not specified in the string (for instance "Group" without a depth, or "L2Cache" without a cache type) are set to -1.

`attrp` is only filled if not `NULL` and if its size specified in `attrsize` is large enough. It should be at least as large as union hwloc_obj_attr_u.

Returns
  0 if a type was correctly identified, otherwise -1.

Note
  This function is guaranteed to match any string returned by hwloc_obj_type_string() or hwloc_obj_type_snprintf().
  This is an extended version of the now deprecated hwloc_obj_type_sscanf().

## ◆ hwloc_type_sscanf_as_depth()

int hwloc_type_sscanf_as_depth | ( | const char * | string,
|  | hwloc_obj_type_t * | typep,
|  | hwloc_topology_t | topology,
|  | int * | depthp
| ) |  |

Return an object type and its level depth from a type string.

Convert strings such as "Package" or "L1iCache" into the corresponding types and return in `depthp` the depth of the corresponding level in the topology `topology`.

If no object of this type is present on the underlying architecture, HWLOC_TYPE_DEPTH_UNKNOWN is returned.

If multiple such levels exist (for instance if giving Group without any depth), the function may return HWLOC_TYPE_DEPTH_MULTIPLE instead.

The matched object type is set in `typep` if `typep` is non `NULL`.

Note
  This function is similar to hwloc_type_sscanf() followed by hwloc_get_type_depth() but it also automatically disambiguates multiple group levels etc.
  This function is guaranteed to match any string returned by hwloc_obj_type_string() or hwloc_obj_type_snprintf().