Cannot connect kdb+ through unix domain socket

[even-wei]

Here is my code, please check it out.

package main

import (
	"bytes"
	"fmt"
	"log"
	"os"
	"os/exec"
	"strconv"

	kdb "github.com/sv/kdbgo"
)

var testPort = 0

func StartQ(ready chan struct{}) {
	fmt.Println("Starting q process on random port")
	_, err := exec.LookPath("q")
	if err != nil {
		log.Fatal("installing q is in your future")
	}
	cmd := exec.Command("q", "-p", "0W", "-q")
	stdin, err := cmd.StdinPipe()
	if err != nil {
		log.Fatal("Failed to connect stdin", err)
	}
	stdin.Write([]byte(".z.pi:.z.pg:.z.ps:{value 0N!x};system\"p\"\n"))
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		log.Fatal("Failed to connect stdout", err)
	}
	stderr, err := cmd.StderrPipe()
	if err != nil {
		log.Fatal("Failed to connect stderr", err)
	}
	err = cmd.Start()
	if err != nil {
		log.Fatal("Failed to start q", err)
	}
	buf := make([]byte, 16)
	n, err := stdout.Read(buf)
	if err != nil {
		log.Fatal("Failed to fill port number for child process: ", err)
	}
	testPort, err = strconv.Atoi(string(buf[:bytes.IndexByte(buf, 'i')]))
	if err != nil {
		fmt.Println("Failed to setup listening port", string(buf[:n]), err)
		cmd.Process.Kill()
		os.Exit(1)
	}
	fmt.Println("Listening port is ", testPort)
	go func() {
		for {
			buf := make([]byte, 256)
			n, err := stderr.Read(buf)
			fmt.Println("Q stderr output:", string(buf[:n]))
			if err != nil {
				fmt.Println("Q stderr error:", err)
				return
			}
		}
	}()
	go func() {
		for {
			buf := make([]byte, 256)
			_, err := stdout.Read(buf)
			//fmt.Println("Q stdout output:", string(buf[:n]))
			if err != nil {
				fmt.Println("Q stdout error:", err)
				return
			}
		}
	}()
	ready <- struct{}{}
	cmd.Wait()
	//stdin.Write([]byte("show `exiting_process;\nexit 0\n"))
}

func main() {
	ready := make(chan struct{})
	go StartQ(ready)

	<-ready
	log.Println("Connect to kdb+ through unix socket.")
	con, err := kdb.DialUnix("localhost", testPort, "")
	if err != nil {
		panic(err)
	}

	log.Println("Close the connection")
	err = con.Close()
	if err != nil {
		panic(err)
	}
}

[sv]

What is the error you get from DialUnix?