SFAS_SELECT_S
mode &= ~SFAS_SELECT_S;
sync = ((mode & SFAS_SELECT_S) ? 1 : 0);
#define SFAS_SELECT_RS (SFAS_SELECT_R|SFAS_SELECT_S)
#define SFAS_SELECT_SI (SFAS_SELECT_S|SFAS_SELECT_I)
#define SFAS_SELECT_RSI (SFAS_SELECT_R|SFAS_SELECT_S|SFAS_SELECT_I)