send file descriptor from golang to nodejs

send_fd__to_node.go

package main

import (
  "net"
  "fmt"
  "syscall"
)

func main() {
  addr, err := net.ResolveTCPAddr("tcp", "localhost:8090")
  if err != nil {
    fmt.Print(err)
    return;
  }
  conn, err := net.DialTCP("tcp", nil, addr)
  if err != nil {
    fmt.Print(err)
    return;
  }
  defer conn.Close();
  fmt.Fprintf(conn, "GET / HTTP/1.1\r\nHost: localhost:8090\r\nConnection: keep-alive\r\n\r\n")
  file, err := conn.File()
  if err != nil {
    fmt.Print(err)
    return;
  }
  fd := file.Fd()
  rights := syscall.UnixRights(int(fd))
  _, err = syscall.Write(3, []byte("{\"cmd\":\"NODE_HANDLE\",\"type\":\"net.Socket\",\"msg\":{\"test\":true}}\n"))
  if err != nil {
    fmt.Print(err)
    return;
  }
  err = syscall.Sendmsg(3, nil, rights, nil, 0)
  if err != nil {
    fmt.Print(err)
    return;
  }
  fmt.Print("ok\n")
  for _, v := range syscall.Environ() {
    fmt.Print(v, "\n")
  }
}

great job! thanks a lot!