sc_check_sw 3 opensc sc_check_sw Check return status from a card transaction #include <opensc.h> int sc_check_sw(struct sc_card *card, int sw1, int sw2); This function checks the return status as given in sw1 and sw2 against the card-specific errors of card. These are set by sc_transmit_apdu() in the apdu.sw1 and apdu.sw2 fields, respectively. The function should be called after every APDU transmission, to convert the card's status code to an OpenSC error code. Returns 0 if successful, or a negative value in case of error.