runsc: Add exec flag that specifies where to save the sandbox-internal pid.

This is different from the existing -pid-file flag, which saves a host pid.

PiperOrigin-RevId: 212713968
Change-Id: I2c486de8dd5cfd9b923fb0970165ef7c5fc597f0

1 files changed, 5 insertions, 4 deletions

diff --git a/runsc/container/container.go b/runsc/container/container.go
index 9a05a1dc5..38848d02f 100644
--- a/runsc/container/container.go
+++ b/runsc/container/container.go
@@ -353,13 +353,14 @@ func Run(id string, spec *specs.Spec, conf *boot.Config, bundleDir, consoleSocke
 	return c.Wait()
 }
 
-// Execute runs the specified command in the container.
-func (c *Container) Execute(e *control.ExecArgs) (syscall.WaitStatus, error) {
-	log.Debugf("Execute in container %q, args: %+v", c.ID, e)
+// Execute runs the specified command in the container. It returns the pid of
+// the newly created process.
+func (c *Container) Execute(args *control.ExecArgs) (int32, error) {
+	log.Debugf("Execute in container %q, args: %+v", c.ID, args)
 	if c.Status != Created && c.Status != Running {
 		return 0, fmt.Errorf("cannot exec in container in state %s", c.Status)
 	}
-	return c.Sandbox.Execute(c.ID, e)
+	return c.Sandbox.Execute(c.ID, args)
 }
 
 // Event returns events for the container.