runsc: Add --pid flag to runsc kill.

--pid allows specific processes to be signalled rather than the container root
process or all processes in the container. containerd needs to SIGKILL exec'd
processes that timeout and check whether processes are still alive.

PiperOrigin-RevId: 217547636
Change-Id: I2058ebb548b51c8eb748f5884fb88bad0b532e45

1 files changed, 9 insertions, 1 deletions

diff --git a/runsc/container/test_app.go b/runsc/container/test_app.go
index 9e4b5326d..cc3b087e1 100644
--- a/runsc/container/test_app.go
+++ b/runsc/container/test_app.go
@@ -125,6 +125,7 @@ func server(listener net.Listener, out *os.File) {
 type taskTree struct {
 	depth int
 	width int
+	pause bool
 }
 
 // Name implements subcommands.Command.
@@ -146,6 +147,7 @@ func (*taskTree) Usage() string {
 func (c *taskTree) SetFlags(f *flag.FlagSet) {
 	f.IntVar(&c.depth, "depth", 1, "number of levels to create")
 	f.IntVar(&c.width, "width", 1, "number of tasks at each level")
+	f.BoolVar(&c.pause, "pause", false, "whether the tasks should pause perpetually")
 }
 
 // Execute implements subcommands.Command.
@@ -164,7 +166,8 @@ func (c *taskTree) Execute(ctx context.Context, f *flag.FlagSet, args ...interfa
 		cmd := exec.Command(
 			"/proc/self/exe", c.Name(),
 			"--depth", strconv.Itoa(c.depth-1),
-			"--width", strconv.Itoa(c.width))
+			"--width", strconv.Itoa(c.width),
+			"--pause", strconv.FormatBool(c.pause))
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
 
@@ -177,6 +180,11 @@ func (c *taskTree) Execute(ctx context.Context, f *flag.FlagSet, args ...interfa
 	for _, c := range cmds {
 		c.Wait()
 	}
+
+	if c.pause {
+		select {}
+	}
+
 	return subcommands.ExitSuccess
 }