Defined in 3 files as a macro:

• contrib/tcpdump/tcp.h, line 72 (as a macro)
• sys/contrib/ipfilter/netinet/ip_compat.h, line 889 (as a macro)
• sys/netinet/tcp.h, line 94 (as a macro)

Referenced in 7 files:

• contrib/ipfilter/lib/tcpoptnames.c, line 19
• contrib/tcpdump/print-tcp.c
  • line 122
  • line 465
• sys/contrib/ipfilter/netinet/ip_compat.h, line 888
• sys/netinet/tcp_input.c, line 3343
• sys/netinet/tcp_output.c, line 1745
• sys/netpfil/ipfw/ip_fw2.c, line 366
• sys/netpfil/pf/pf.c, line 2317