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Automatic merge from submit-queue (batch tested with PRs 39446, 40023, 36853) Add SIGCHLD handler to pause container **What this PR does / why we need it**: This allows pause to reap orphaned zombies in a shared PID namespace. (#1615) **Special notes for your reviewer**: I plan to discuss this with SIG Node to ensure compatibility with future runtimes. **Release note**: This will have no effect until shared PID namespace is enabled, so recommend release-note-none. This allows pause to reap zombies in the upcoming Shared PID namespace (#1615). Uses the better defined sigaction() instead of signal() for all signals both for consistency (SIGCHLD handler avoids SA_RESTART) and to avoid the implicit signal()->sigaction() translation of various libc versions. Also makes warnings errors and includes a tool to make orphaned zombies for manual testing. |
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