WaitSRQ -- sleep until the SRQ bus line is asserted
void WaitSRQ(int board_desc, short *result);
WaitSRQ() sleeps until either the SRQ
bus line is
asserted, or a timeout (see ibtmo())
occurs. A '1' will be written to the location specified by
result if SRQ was asserted, and a
'0' will be written if the function timed out.