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package main
import (
"fmt"
"log"
"net"
"runtime"
"syscall"
"time"
)
func CheckError(err error) {
if err != nil {
log.Fatal("Error: " , err)
}
}
func TestFinalize(conn *net.UDPConn) {
event := make(chan string)
runtime.SetFinalizer(conn, func (obj *net.UDPConn) {
fmt.Println("Finalize: UDPConn", obj.LocalAddr(), obj.RemoteAddr())
event <- "Finalize UDPConn"
})
runtime.GC()
select {
case res := <-event:
fmt.Println(res)
case <-time.After(2 * time.Second):
fmt.Println("No finalize")
}
}
func test() {
ServerAddr,err := net.ResolveUDPAddr("udp", "127.0.0.1:10001")
CheckError(err)
LocalAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:10002")
CheckError(err)
conn, err := net.DialUDP("udp", LocalAddr, ServerAddr)
CheckError(err)
runtime.KeepAlive(conn)
sd, err := conn.File()
CheckError(err)
TestFinalize(conn)
var fd int
fd = int(sd.Fd())
syscall.SetNonblock(fd, true)
// conn.Write([]byte("HelloWorld!"))
//_, err = sd.Write([]byte("HelloWorld!"))
_, err = syscall.Write(fd, []byte("HelloWorld!"))
CheckError(err)
}
func main() {
test()
}
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