Am Montag, 26. September 2016 04:53:01 UTC+2 schrieb Jon Strauss:
>
> This error:
>
> panic: runtime error: invalid memory address or nil pointer dereference
>
> [signal 0xb code=0x1 addr=0x20 pc=0x401487]
>
>
> goroutine 1 [running]:
>
> panic(0x50bfa0, 0xc82000a0c0)
>
> /usr/lib/go-1.6/src/runtime/panic.go:481 +0x3e6
>
> main.main()
>
> /root/Whois3/rest-whois-threaded/main.go:65 +0x67
>
> Is produced by this code: I commented line 65. Is there an error in the go?
>
No. In is nil and calling Accept on nil panics.
You really should check all errors.
V.
> package main
>
>
>
import (
>
> "os"
>
> "net"
>
> "syscall"
>
> "time"
>
> )
>
>
> func reader(incoming net.Conn, outgoing net.Conn,ready chan bool) {
>
>
> var buffer []byte
>
> <- ready
>
> buffer = make([]byte,2)
>
> for {
>
> read, _ := incoming.Read(buffer)
>
> outgoing.Write(buffer)
>
> if read == 0 {
>
> break
>
> }
>
> }
>
> return
>
> }
>
>
> func writer(outgoing net.Conn, incoming net.Conn, ready chan bool) {
>
>
> var buffer []byte
>
> <- ready
>
> buffer = make([]byte,2)
>
> for {
>
> read, _ := outgoing.Read(buffer)
>
> incoming.Write(buffer)
>
> if read == 0 {
>
> break
>
> }
>
> }
>
> return
>
> }
>
>
> func worker(connection net.Conn) {
>
> var ready chan bool
>
> var app net.Conn
>
> var process *os.Process
>
> var attr *syscall.ProcAttr
>
> var stuff []string
>
>
> attr.Dir = "/my/dir"
>
>
> pid,_ := syscall.ForkExec("/my/exec", stuff, attr)
>
> process.Pid = pid
>
> app, _= net.Dial("tcp", "127.0.0.1:5000")
>
> go reader(connection,app,ready)
>
> go writer(connection,app,ready)
>
>
> ready <- true
>
> time.Sleep(7 * time.Second)
>
> process.Kill()
>
> return
>
> }
>
>
> func main() {
>
> ln, _ := net.Listen("tcp", ":80")
>
>
> for {
>
> conn, _ := ln.Accept() // Line 65
>
> go worker(conn)
>
> }
>
>
> }
>
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