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>
1 file changed
tree: 18297b349f80a7cbba579355e49c98f1c5399410
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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