fido_dev_get_touch_status(fido_dev_t *dev, int *touched, int ms);
The functions described in this page allow an application to asynchronously wait for touch on a FIDO authenticator. This is useful when multiple authenticators are present and the application needs to know which one to use.
fido_dev_get_touch_begin() function initiates a touch request on dev.
fido_dev_get_touch_status() function continues an ongoing touch request on dev, blocking up to ms milliseconds. On success, touched will be updated to reflect the touch request status. If touched is 1, the device was touched, and the touch request is terminated. If touched is 0, the application may call
fido_dev_get_touch_status() to continue the touch request, or
fido_dev_cancel() to terminate it.
The error codes returned by
fido_dev_get_touch_status() are defined in <
fido/err.h>. On success,
FIDO_OK is returned.
Please refer to examples/select.c in libfido2's source tree.
fido_dev_get_touch_status() function will cause a command to be transmitted to U2F authenticators. These transmissions should not exceed a frequency of 5Hz.
The man page fido_dev_get_touch_status(3) is an alias of fido_dev_get_touch_begin(3).