syscall: add type for struct tcp_info

R=mikioh.mikioh, rsc
CC=golang-dev
https://golang.org/cl/6900050

src/pkg/syscall/types_linux.go

@@ -195,6 +195,8 @@ type Inet6Pktinfo C.struct_in6_pktinfo
 
 type Ucred C.struct_ucred
 
+type TCPInfo C.struct_tcp_info
+
 const (
 	SizeofSockaddrInet4     = C.sizeof_struct_sockaddr_in
 	SizeofSockaddrInet6     = C.sizeof_struct_sockaddr_in6
@@ -211,6 +213,7 @@ const (
 	SizeofInet4Pktinfo      = C.sizeof_struct_in_pktinfo
 	SizeofInet6Pktinfo      = C.sizeof_struct_in6_pktinfo
 	SizeofUcred             = C.sizeof_struct_ucred
+	SizeofTCPInfo           = C.sizeof_struct_tcp_info
 )
 
 // Netlink routing and interface messages

src/pkg/syscall/ztypes_linux_amd64.go

@@ -253,6 +253,40 @@ type Ucred struct {
 	Gid uint32
 }
 
+type TCPInfo struct {
+	State          uint8
+	Ca_state       uint8
+	Retransmits    uint8
+	Probes         uint8
+	Backoff        uint8
+	Options        uint8
+	Pad_cgo_0      [2]byte
+	Rto            uint32
+	Ato            uint32
+	Snd_mss        uint32
+	Rcv_mss        uint32
+	Unacked        uint32
+	Sacked         uint32
+	Lost           uint32
+	Retrans        uint32
+	Fackets        uint32
+	Last_data_sent uint32
+	Last_ack_sent  uint32
+	Last_data_recv uint32
+	Last_ack_recv  uint32
+	Pmtu           uint32
+	Rcv_ssthresh   uint32
+	Rtt            uint32
+	Rttvar         uint32
+	Snd_ssthresh   uint32
+	Snd_cwnd       uint32
+	Advmss         uint32
+	Reordering     uint32
+	Rcv_rtt        uint32
+	Rcv_space      uint32
+	Total_retrans  uint32
+}
+
 const (
 	SizeofSockaddrInet4     = 0x10
 	SizeofSockaddrInet6     = 0x1c
@@ -269,6 +303,7 @@ const (
 	SizeofInet4Pktinfo      = 0xc
 	SizeofInet6Pktinfo      = 0x14
 	SizeofUcred             = 0xc
+	SizeofTCPInfo           = 0x68
 )
 
 const (