keepalive 成功解决 ZWP 问题 当接收端不理发送端的时候 每 idleTime 就会重发一个询问报文

tcpip/tcpip.go

@@ -8,6 +8,7 @@ import (
 	"reflect"
 	"strings"
 	"sync/atomic"
+	"time"
 )
 
 type Error struct {
@@ -383,6 +384,32 @@ type ReceiveQueueSizeOption int
 // SO_TIMESTAMP socket control messages are enabled.
 type TimestampOption int
 
+// TCPInfoOption is used by GetSockOpt to expose TCP statistics.
+//
+// TODO: Add and populate stat fields.
+type TCPInfoOption struct {
+	RTT    time.Duration
+	RTTVar time.Duration
+}
+
+// KeepaliveEnabledOption is used by SetSockOpt/GetSockOpt to specify whether
+// TCP keepalive is enabled for this socket.
+type KeepaliveEnabledOption int
+
+// KeepaliveIdleOption is used by SetSockOpt/GetSockOpt to specify the time a
+// connection must remain idle before the first TCP keepalive packet is sent.
+// Once this time is reached, KeepaliveIntervalOption is used instead.
+type KeepaliveIdleOption time.Duration
+
+// KeepaliveIntervalOption is used by SetSockOpt/GetSockOpt to specify the
+// interval between sending TCP keepalive packets.
+type KeepaliveIntervalOption time.Duration
+
+// KeepaliveCountOption is used by SetSockOpt/GetSockOpt to specify the number
+// of un-ACKed TCP keepalives that will be sent before the connection is
+// closed.
+type KeepaliveCountOption int
+
 // MulticastTTLOption is used by SetSockOpt/GetSockOpt to control the default
 // TTL value for multicast messages. The default is 1.
 type MulticastTTLOption uint8