tun: remove unused isUp method
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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@ -12,7 +12,6 @@ import (
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"bytes"
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"errors"
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"fmt"
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"net"
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"os"
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"sync"
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"syscall"
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@ -164,11 +163,6 @@ func (tun *NativeTun) routineNetlinkListener() {
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}
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}
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func (tun *NativeTun) isUp() (bool, error) {
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inter, err := net.InterfaceByName(tun.name)
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return inter.Flags&net.FlagUp != 0, err
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}
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func getIFIndex(name string) (int32, error) {
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fd, err := unix.Socket(
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unix.AF_INET,
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