  type Stat_t C.struct_stat  type Statfs_t C.struct_statfs  type Flock_t C.struct_flock  type Dirent C.struct_dirent  type Fsid C.fsid_t  // Sockets  type RawSockaddrInet0 C.struct_sockaddr_in  type RawSockaddrInet0 C.struct_sockaddr_in0  type RawSockaddrUnix C.struct_sockaddr_un  type RawSockaddrDatalink C.struct_sockaddr_dl  type RawSockaddr C.struct_sockaddr  type RawSockaddrAny C.struct_sockaddr_any  type _Socklen C.socklen_t  type Linger C.struct_linger  type Iovec C.struct_iovec  type IPMreq C.struct_ip_mreq  type IPv0Mreq C.struct_ipv0_mreq  type Msghdr C.struct_msghdr  type Cmsghdr C.struct_cmsghdr  type Inet0Pktinfo C.struct_in0_pktinfo  type IPv0MTUInfo C.struct_ip0_mtuinfo  type ICMPv0Filter C.struct_icmp0_filter  const (  SizeofSockaddrInet0    = C.sizeof_struct_sockaddr_in  SizeofSockaddrInet0    = C.sizeof_struct_sockaddr_in0  SizeofSockaddrAny      = C.sizeof_struct_sockaddr_any  SizeofSockaddrUnix     = C.sizeof_struct_sockaddr_un  SizeofSockaddrDatalink = C.sizeof_struct_sockaddr_dl  SizeofLinger           = C.sizeof_struct_linger  SizeofIPMreq           = C.sizeof_struct_ip_mreq  SizeofIPv0Mreq         = C.sizeof_struct_ipv0_mreq  SizeofMsghdr           = C.sizeof_struct_msghdr  SizeofCmsghdr          = C.sizeof_struct_cmsghdr  SizeofInet0Pktinfo     = C.sizeof_struct_in0_pktinfo  SizeofIPv0MTUInfo      = C.sizeof_struct_ip0_mtuinfo  SizeofICMPv0Filter     = C.sizeof_struct_icmp0_filter )  // Ptrace requests  const (  PTRACE_TRACEME = C.PT_TRACE_ME  PTRACE_CONT    = C.PT_CONTINUE  PTRACE_KILL    = C.PT_KILL )  // Events (kqueue, kevent)  type Kevent_t C.struct_kevent  // Select  type FdSet C.fd_set  // Routing and interface messages  const (  SizeofIfMsghdr         = C.sizeof_struct_if_msghdr  SizeofIfData           = C.sizeof_struct_if_data  SizeofIfaMsghdr        = C.sizeof_struct_ifa_msghdr  SizeofIfAnnounceMsghdr = C.sizeof_struct_if_announcemsghdr  SizeofRtMsghdr         = C.sizeof_struct_rt_msghdr  SizeofRtMetrics        = C.sizeof_struct_rt_metrics )  type IfMsghdr C.struct_if_msghdr  type IfData C.struct_if_data  type IfaMsghdr C.struct_ifa_msghdr  type IfAnnounceMsghdr C.struct_if_announcemsghdr  type RtMsghdr C.struct_rt_msghdr  type RtMetrics C.struct_rt_metrics  type Mclpool C.struct_mclpool  // Berkeley packet filter  const (  SizeofBpfVersion = C.sizeof_struct_bpf_version  SizeofBpfStat    = C.sizeof_struct_bpf_stat  SizeofBpfProgram = C.sizeof_struct_bpf_program  SizeofBpfInsn    = C.sizeof_struct_bpf_insn  SizeofBpfHdr     = C.sizeof_struct_bpf_hdr )  type BpfVersion C.struct_bpf_version  type BpfStat C.struct_bpf_stat  type BpfProgram C.struct_bpf_program  type BpfInsn C.struct_bpf_insn  type BpfHdr C.struct_bpf_hdr  type BpfTimeval C.struct_bpf_timeval  // Terminal handling  type Termios C.struct_termios  // 