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| HDF5 Last Updated on 2026-03-23 The HDF5 Field Guide

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H5O_info2_t Struct Reference

`#include <src/H5Opublic.h>`

## Detailed Description

Data model information struct for objects (For H5Oget_info(), H5Oget_info_by_name(), H5Oget_info_by_idx() version 3)

## Data Fields
time_t | atime
time_t | btime
time_t | ctime
unsigned long | fileno
time_t | mtime
hsize_t | num_attrs
unsigned | rc
H5O_token_t | token
H5O_type_t | type

## Field Documentation

## ◆ atime

time_t atime

Access time

## ◆ btime

time_t btime

Birth time

## ◆ ctime

time_t ctime

Change time

## ◆ fileno

unsigned long fileno

File number that object is located in. Constant across multiple opens of the same file

## ◆ mtime

time_t mtime

Modification time

## ◆ num_attrs

hsize_t num_attrs

Number of attributes attached to object

## ◆ rc

unsigned rc

Reference count of object

## ◆ token

H5O_token_t token

Token representing the object

## ◆ type

H5O_type_t type

Basic object type (group, dataset, etc.)

The documentation for this struct was generated from the following file:

- src/H5Opublic.h