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Add runsc kill --pgid
Follow up PR of #12739 for adding
runsc kill --pgid xxxsupport.Changes
Adds a
--pgidflag torunsc killthat sends a signal to all processes in a given process group (identified by PGID in the root PID namespace). This complements the existing--pidand--allflags.The signal is delivered through the existing
ContMgrSignalRPCvia a newDeliverToProcessGroupdelivery mode, following the samecontainer -> sandbox -> loaderchain as the other signal modes.Testing
TestSignalProcessGroupcreates a 3-process container (init -> child -> grandchild) where the child callssetpgidto form a new process group shared with the grandchild. The test sendsSIGKILLto that PGID and verifies:A new
task-tree-pgidtest app subcommand supports this by spawning a deterministic process tree with a distinct process group.FUTURE_COPYBARA_INTEGRATE_REVIEW=#12905 from danielpfeifer02:dpfeifer/runsc-kill-pgid 7afe641