What version of Go are you using?
Ian
On Thu, Jun 15, 2023, 5:32 AM akalio ja <jaaka...@gmail.com> wrote:
> func openTun(ch chan int, timer *time.Timer) {
>
> fd, err := unix.Open("/dev/net/tun", unix.O_RDWR|unix.O_NONBLOCK, 0)
> if err != nil {
> panic(err)
> }
> defer unix.Close(fd)
>
> var ifr struct {
> name [16]byte
> flags uint16
> _ [22]byte
> }
> copy(ifr.name[:], "tun0")
> ifr.flags = unix.IFF_TUN | unix.IFF_NO_PI
> _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd),
> unix.TUNSETIFF, uintptr(unsafe.Pointer(&ifr)))
> if errno != 0 {
> log.Println("err to syscall:", errno)
> return
> }
>
> ch <- fd
> bytes := []byte("hell can you recv?")
> fmt.Println(unix.Write(fd, bytes))
>
> ticker := time.NewTicker(time.Second * 10)
> for {
> select {
> case <-ticker.C:
> fmt.Println(unix.Write(fd, bytes))
> case <-timer.C:
> return
> }
> }
> }
>
> func readFd(fd int) {
>
> ticker := time.NewTicker(time.Second * 10)
> buffer := make([]byte, 1024)
> for {
> <-ticker.C
> n, err := unix.Read(fd, buffer)
> if err != nil {
> if err == unix.EAGAIN {
> log.Println("No data available at the moment")
> } else {
> log.Println("Error reading from file descriptor:", err)
> return
> }
> } else {
> log.Println("reading from file descriptor:", string
> (buffer[:n]))
> }
> }
> }
>
> func main() {
> fdchannel, done := make(chan int, 1), time.NewTimer(time.Minute)
> go openTun(fdchannel, done)
> fd := <-fdchannel
> log.Println("opened fd", fd)
> go readFd(fd)
>
> <- done.C
> }
>
> --
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