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28.Dd $Mdocdate: September 13 2019 $
29.Dt FIDO_BIO_INFO_NEW 3
30.Os
31.Sh NAME
32.Nm fido_bio_info_new ,
33.Nm fido_bio_info_free ,
34.Nm fido_bio_info_type ,
35.Nm fido_bio_info_max_samples
36.Nd FIDO2 biometric sensor information API
37.Sh SYNOPSIS
38.In fido.h
39.In fido/bio.h
40.Ft fido_bio_info_t *
41.Fn fido_bio_info_new "void"
42.Ft void
43.Fn fido_bio_info_free "fido_bio_info_t **info_p"
44.Ft uint8_t
45.Fn fido_bio_info_type "const fido_bio_info_t *info"
46.Ft uint8_t
47.Fn fido_bio_info_max_samples "const fido_bio_info_t *info"
48.Sh DESCRIPTION
49Biometric sensor metadata is abstracted in
50.Em libfido2
51by the
52.Vt fido_bio_info_t
53type.
54.Pp
55The functions described in this page allow a
56.Vt fido_bio_info_t
57type to be allocated, deallocated, and inspected.
58For device operations on
59.Vt fido_bio_info_t ,
60please refer to
61.Xr fido_bio_dev_get_info 3 .
62.Pp
63The
64.Fn fido_bio_info_new
65function returns a pointer to a newly allocated, empty
66.Vt fido_bio_info_t
67type.
68If memory cannot be allocated, NULL is returned.
69.Pp
70The
71.Fn fido_bio_info_free
72function releases the memory backing
73.Fa *info_p ,
74where
75.Fa *info_p
76must have been previously allocated by
77.Fn fido_bio_info_new .
78On return,
79.Fa *info_p
80is set to NULL.
81Either
82.Fa info_p
83or
84.Fa *info_p
85may be NULL, in which case
86.Fn fido_bio_info_free
87is a NOP.
88.Pp
89The
90.Fn fido_bio_info_type
91function returns the fingerprint sensor type, which is
92.Dv 1
93for touch sensors, and
94.Dv 2
95for swipe sensors.
96.Pp
97The
98.Fn fido_bio_info_max_samples
99function returns the maximum number of successful samples
100required for enrollment.
101.Sh SEE ALSO
102.Xr fido_bio_dev_get_info 3 ,
103.Xr fido_bio_enroll_new 3 ,
104.Xr fido_bio_template 3
105