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net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS

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Fixes #2224
Fixes tailscale/corp#2045

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-06-22 21:53:43 -07:00
committed by Brad Fitzpatrick
parent 597fa3d3c3
commit 45e64f2e1a
10 changed files with 530 additions and 500 deletions
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4
tstest/resource.go
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@@ -15,19 +15,19 @@ import (
)
func ResourceCheck(tb testing.TB) {
tb.Helper()
startN, startStacks := goroutines()
tb.Cleanup(func() {
if tb.Failed() {
// Something else went wrong.
return
}
tb.Helper()
// Goroutines might be still exiting.
for i := 0; i < 100; i++ {
if runtime.NumGoroutine() <= startN {
return
}
time.Sleep(1 * time.Millisecond)
time.Sleep(5 * time.Millisecond)
}
endN, endStacks := goroutines()
tb.Logf("goroutine diff:\n%v\n", cmp.Diff(startStacks, endStacks))