I'm trying to make a simple echo client and server that uses Unix sockets. In this example, the server can receive data from the client, but it can't send the data back. If I use tcp connections instead, it works great:

Server

package main

import "net"
import "fmt"

func echoServer(c net.Conn) {
    for {
        buf := make([]byte, 512)
        nr, err := c.Read(buf)
        if err != nil {
            return
        }

        data := buf[0:nr]
        fmt.Printf("Received: %v", string(data))
        _, err = c.Write(data)
        if err != nil {
            panic("Write: " + err.String())
        }
    }
}

func main() {
    l, err := net.Listen("unix", "/tmp/echo.sock")
    if err != nil {
        println("listen error", err.String())
        return
    }

    for {
        fd, err := l.Accept()
        if err != nil {
            println("accept error", err.String())
            return
        }

        go echoServer(fd)
    }
}

Client

package main

import "net"
import "time"

func main() {
    c,err := net.Dial("unix","", "/tmp/echo.sock")
    if err != nil {
        panic(err.String())
    }
    for {
        _,err := c.Write([]byte("hi\n"))
        if err != nil {
            println(err.String())
        }
        time.Sleep(1e9)
    }
}