Symbol: TCP_X2_A
usr/src/uts/common/inet/ipf/netinet/ip_compat.h
1793
# define TCP_X2_A(x,y) (x)->th_x2 = (y)
usr/src/uts/common/inet/ipf/netinet/ip_compat.h
734
# define TCP_X2_A(x,y) (x)->th_xoff |= ((y) & 0xf)