I have a server, when accepting a connection, I set tcp-keep-alive for 120seconds.But when I close the connection, acctually the connection doesn't close.by netstat -anp | grep 9999, I found the state was ESTABLISHED .And the client didn't receive any error from the socket , either. I want to know will tcp-keep-alive affect the tcp-close?
PS go 1.4 centos
package main
import (
"github.com/felixge/tcpkeepalive"
"net"
"runtime"
"time"
)
func Start() {
tcpAddr, err := net.ResolveTCPAddr("tcp4", "127.0.0.1:9999")
if err != nil {
return
}
listener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
return
}
for {
conn, err := listener.AcceptTCP()
if err != nil {
continue
}
go handleClient(conn)
}
}
func handleClient(conn *net.TCPConn) {
kaConn, err := tcpkeepalive.EnableKeepAlive(conn)
if err != nil {
} else {
kaConn.SetKeepAliveIdle(120 * time.Second)
kaConn.SetKeepAliveCount(4)
kaConn.SetKeepAliveInterval(5 * time.Second)
}
time.Sleep(time.Second * 3)
conn.Close()
return
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
Start()
}
Don't use that keepalive library. It duplicates file descriptors, and fails to close them.
If you need to set KeepAlive, use the methods provided in the net package.
You likely don't need any extra options set, but only if you're certain you do, then you can try to apply what's needed with the appropriate syscalls.