wgengine/tstun: make Close safe for concurrent use

reviewable/pr773/r1
Brad Fitzpatrick 4 years ago
parent 3bdcfa7193
commit abe095f036

@ -63,6 +63,8 @@ type TUN struct {
// tdev is the underlying TUN device.
tdev tun.Device
closeOnce sync.Once
_ [4]byte // force 64-bit alignment of following field on 32-bit
lastActivityAtomic int64 // unix seconds of last send or receive
@ -140,15 +142,14 @@ func (t *TUN) SetDestIPActivityFuncs(m map[packet.IP]func()) {
}
func (t *TUN) Close() error {
select {
case <-t.closed:
// continue
default:
var err error
t.closeOnce.Do(func() {
// Other channels need not be closed: poll will exit gracefully after this.
close(t.closed)
}
return t.tdev.Close()
err = t.tdev.Close()
})
return err
}
func (t *TUN) Events() chan tun.Event {

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