NAME

     fido_dev_open, fido_dev_close, fido_dev_cancel, fido_dev_new, fido_dev_free,
     fido_dev_force_fido2, fido_dev_force_u2f, fido_dev_is_fido2, fido_dev_protocol,
     fido_dev_build, fido_dev_flags, fido_dev_major, fido_dev_minor — FIDO 2 device open/close
     and related functions

SYNOPSIS

     #include <fido.h>

     int
     fido_dev_open(fido_dev_t *dev, const char *path);

     int
     fido_dev_close(fido_dev_t *dev);

     int
     fido_dev_cancel(fido_dev_t *dev);

     fido_dev_t *
     fido_dev_new(void);

     void
     fido_dev_free(fido_dev_t **dev_p);

     void
     fido_dev_force_fido2(fido_dev_t *dev);

     void
     fido_dev_force_u2f(fido_dev_t *dev);

     bool
     fido_dev_is_fido2(const fido_dev_t *dev);

     uint8_t
     fido_dev_protocol(const fido_dev_t *dev);

     uint8_t
     fido_dev_build(const fido_dev_t *dev);

     uint8_t
     fido_dev_flags(const fido_dev_t *dev);

     uint8_t
     fido_dev_major(const fido_dev_t *dev);

     uint8_t
     fido_dev_minor(const fido_dev_t *dev);

DESCRIPTION

     The fido_dev_open() function opens the device pointed to by path, where dev is a freshly
     allocated or otherwise closed fido_dev_t.

     The fido_dev_close() function closes the device represented by dev.  If dev is already
     closed, fido_dev_close() is a NOP.

     The fido_dev_cancel() function cancels any pending requests on dev.

     The fido_dev_new() function returns a pointer to a newly allocated, empty fido_dev_t.  If
     memory cannot be allocated, NULL is returned.

     The fido_dev_free() function releases the memory backing *dev_p, where *dev_p must have been
     previously allocated by fido_dev_new().  On return, *dev_p is set to NULL.  Either dev_p or
     *dev_p may be NULL, in which case fido_dev_free() is a NOP.

     The fido_dev_force_fido2() function can be used to force CTAP2 communication with dev.

     The fido_dev_force_u2f() function can be used to force CTAP1 (U2F) communication with dev.

     The fido_dev_is_fido2() function returns true if dev is a FIDO 2 device.

     The fido_dev_protocol() function returns the CTAPHID protocol version identifier of dev.

     The fido_dev_build() function returns the CTAPHID build version number of dev.

     The fido_dev_flags() function returns the CTAPHID capabilities flags of dev.

     The fido_dev_major() function returns the CTAPHID major version number of dev.

     The fido_dev_minor() function returns the CTAPHID minor version number of dev.

     For the format and meaning of the CTAPHID parameters returned by functions above, please
     refer to the FIDO Client to Authenticator Protocol (CTAP) specification.

RETURN VALUES

     On success, fido_dev_open() and fido_dev_close() return FIDO_OK.  On error, a different
     error code defined in <fido/err.h> is returned.

SEE ALSO

     fido_dev_info_manifest(3), fido_dev_set_io_functions(3)