crypto/tls: support bogo -wait-for-debugger

When this command line flag is provided to the BoGo runner it will:

* Disable some timeouts
* Limit concurrency to 1 worker at a time
* Pass the -wait-for-debugger flag to the shim process
* Print the PID of the shim process to status output

On the shim-side, we need to react to -wait-for-debugger by sending
ourselves a SIGSTOP signal. When a debugger attaches to the shim the
process will be resumed.

This makes it possible to debug both the runner side and the shim side
of a BoGo interaction without resorting to print style debugging.

Since SIGSTOP is not a signal we can use on Windows this functionality
is limited to unix builds.

Updates #72006

Change-Id: Iafa08cf71830cdfde3e6ee4826914236e3cd7e57
Reviewed-on: https://go-review.googlesource.com/c/go/+/650737
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
3 files changed
tree: 44648e35a75c3c171bf760d99416b3e186fd3db7
  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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