On Thu, Jun 15, 2023 at 10:41 PM akalio ja <[email protected]> wrote: > > GOVERSION="go1.20.3"
Thanks. You didn't say what the exact problem was, but I would guess that you are running into the problem described at https://go.dev/issue/59545. That problem should be fixed in the upcoming 1.21 release. Ian > 在2023年6月15日星期四 UTC+8 23:27:43<Ian Lance Taylor> 写道： >> >> What version of Go are you using? >> >> Ian >> >> On Thu, Jun 15, 2023, 5:32 AM akalio ja <[email protected]> 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 >>> } >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "golang-nuts" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/golang-nuts/4267190c-4024-48d0-b8e3-9749db9a87f9n%40googlegroups.com. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/5f004bba-963d-4f3e-b5bb-e15ee43c0d2fn%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcXBxWSOMeM3twkV_%3D84atsNFhzuOxmjx_3QAL%2Bp6soO8g%40mail.gmail.com.
