GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/root/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/root/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct";
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.20.3"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/root/projs/tmp/go.mod"
GOWORK=""
CGO_CFLAGS="-O2 -g"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-O2 -g"
CGO_FFLAGS="-O2 -g"
CGO_LDFLAGS="-O2 -g"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0
-fdebug-prefix-map=/tmp/go-build3940382547=/tmp/go-build
-gno-record-gcc-switches"
this my env
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 <jaak...@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
>> }
>>
>> --
>> 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 golang-nuts...@googlegroups.com.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/golang-nuts/4267190c-4024-48d0-b8e3-9749db9a87f9n%40googlegroups.com
>>
>> <https://groups.google.com/d/msgid/golang-nuts/4267190c-4024-48d0-b8e3-9749db9a87f9n%40googlegroups.com?utm_medium=email&utm_source=footer>
>> .
>>
>
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