conn is probably nil if there is an error. Call Close only if there is no
error.
conn, err := net.Dial(...)
if err != nil {
// handle error
}
defer conn.Close()
Am Sonntag, 11. Dezember 2016 00:28:36 UTC+1 schrieb Stannis Kozlov:
>
> I'm trying to write simple port scanner and using "net" to check port
> availability:
> func sock() {
> conn, err := net.Dial("tcp", "192.168.0.1:9991")
> if err != nil {
> fmt.Printf("\n!!!:: %v", err)
> conn.Close()
>
> Debug return error:
> !!!:: dial tcp 192.168.0.1:9991: getsockopt: connection refusedpanic:
> runtime error: invalid memory address or nil pointer dereference
> [signal 0xb code=0x1 addr=0x20 pc=0x401186]
>
> goroutine 1 [running]:
> panic(0x564e00, 0xc82000a140)
> /usr/lib/go-1.6/src/runtime/panic.go:481 +0x3e6
> main.sock()
> /home/m/go/ps.go:16 +0x186
> main.main()
> /home/m/go/ps.go:70 +0x620
> exit status 2
>
>
> It looks like "refused" calls runtime error and app crash in panic. How
> can I work with errors to keep my app working?
>
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