Defined in 2 files as a macro:

• sys/contrib/ipfilter/netinet/ip_compat.h, line 876 (as a macro)
• sys/netinet/tcp.h, line 88 (as a macro)

Referenced in 8 files:

• contrib/ipfilter/lib/tcpoptnames.c, line 17
• sys/contrib/ipfilter/netinet/ip_compat.h, line 875
• sys/contrib/ipfilter/netinet/ip_state.c, line 1953
• sys/netinet/tcp_input.c, line 3353
• sys/netinet/tcp_output.c, line 1717
• sys/netpfil/ipfw/ip_fw2.c, line 359
• sys/netpfil/pf/pf.c, line 3010
• sys/netpfil/pf/pf_osfp.c, line 164