FIDO\_BIO\_INFO\_NEW(3) Library Functions Manual FIDO\_BIO\_INFO\_NEW(3)

# [NAME](#NAME)

`fido_bio_info_new`, `fido_bio_info_free`, `fido_bio_info_type`, `fido_bio_info_max_samples` — FIDO2 biometric sensor information API

# [SYNOPSIS](#SYNOPSIS)

`#include <fido.h>`  
`#include <fido/bio.h>`

`fido_bio_info_t *`  
`fido_bio_info_new`(`void`);

`void`  
`fido_bio_info_free`(`fido_bio_info_t **info_p`);

`uint8_t`  
`fido_bio_info_type`(`const fido_bio_info_t *info`);

`uint8_t`  
`fido_bio_info_max_samples`(`const fido_bio_info_t *info`);

# [DESCRIPTION](#DESCRIPTION)

Biometric sensor metadata is abstracted in [*libfido2*](#libfido2) by the `fido_bio_info_t` type.

The functions described in this page allow a `fido_bio_info_t` type to be allocated, deallocated, and inspected. For device operations on `fido_bio_info_t`, please refer to [fido\_bio\_dev\_get\_info(3)](/man/os/libfido2/fido_bio_dev_get_info.3).

The [`fido_bio_info_new`](#fido_bio_info_new)() function returns a pointer to a newly allocated, empty `fido_bio_info_t` type. If memory cannot be allocated, NULL is returned.

The [`fido_bio_info_free`](#fido_bio_info_free)() function releases the memory backing `*info_p`, where `*info_p` must have been previously allocated by `fido_bio_info_new`(). On return, `*info_p` is set to NULL. Either `info_p` or `*info_p` may be NULL, in which case `fido_bio_info_free`() is a NOP.

The [`fido_bio_info_type`](#fido_bio_info_type)() function returns the fingerprint sensor type, which is `1` for touch sensors, and `2` for swipe sensors.

The [`fido_bio_info_max_samples`](#fido_bio_info_max_samples)() function returns the maximum number of successful samples required for enrollment.

# [SEE ALSO](#SEE_ALSO)

[fido\_bio\_dev\_get\_info(3)](/man/os/libfido2/fido_bio_dev_get_info.3), [fido\_bio\_enroll\_new(3)](/man/os/libfido2/fido_bio_enroll_new.3), [fido\_bio\_template(3)](/man/os/libfido2/fido_bio_template.3)

September 13, 2019 Linux 4.19.0-gvisor

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Document: fido_bio_info_type(3) from libfido2 1.17.0-r7 (Chainguard OS)
Source: https://github.com/Yubico/libfido2