os/signal: avoid flaky TestCtrlBreak by waiting for child stdout TestCtrlBreak relied on a fixed sleep to wait for a testing child program to be ready to receive the signal. This may cause flaky timeouts on slow machines. Instead, wait for the child to print a "ready" message like other signal tests, particularly runtime.TestLibraryCtrlHandler. Also fix a typo in the child program's file name to ensure it's easy to associate with the test. Fixes #80036 Change-Id: Ib3d8e6194538df95e76548771b401cf9b9de5674 Reviewed-on: https://go-review.googlesource.com/c/go/+/792020 LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Alex Brainman <alex.brainman@gmail.com> Reviewed-by: Hongxiang Jiang <hxjiang@golang.org> Auto-Submit: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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