Defined in 2 files as a macro:

• sys/contrib/ipfilter/netinet/ip_compat.h, line 851 (as a macro)
• sys/netinet/tcp.h, line 92 (as a macro)

Referenced in 7 files:

• contrib/ipfilter/lib/tcpoptnames.c, line 18
• sys/contrib/ipfilter/netinet/ip_compat.h, line 850
• sys/contrib/ipfilter/netinet/ip_state.c, line 1972
• sys/netinet/tcp_input.c, line 3351
• sys/netinet/tcp_output.c, line 1692
• sys/netpfil/ipfw/ip_fw2.c, line 365
• sys/netpfil/pf/pf_osfp.c, line 174