Add parent death signal to the container config

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

configs/config.go

@@ -21,6 +21,10 @@ type Config struct {
 	// This is a common option when the container is running in ramdisk
 	NoPivotRoot bool `json:"no_pivot_root,omitempty"`
 
+	// ParentDeathSignal specifies the signal that is sent to the container's process in the case
+	// that the parent process dies.
+	ParentDeathSignal int `json:"parent_death_signal,omitempty"`
+
 	// PivotDir allows a custom directory inside the container's root filesystem to be used as pivot, when NoPivotRoot is not set.
 	// When a custom PivotDir not set, a temporary dir inside the root filesystem will be used. The pivot dir needs to be writeable.
 	// This is required when using read only root filesystems. In these cases, a read/writeable path can be (bind) mounted somewhere inside the root filesystem to act as pivot.

linux_container.go

@@ -117,8 +117,7 @@ func (c *linuxContainer) commandTemplate(process *Process) *exec.Cmd {
 	if cmd.SysProcAttr == nil {
 		cmd.SysProcAttr = &syscall.SysProcAttr{}
 	}
-	// TODO: add pdeath to config for a container
-	cmd.SysProcAttr.Pdeathsig = syscall.SIGKILL
+	cmd.SysProcAttr.Pdeathsig = syscall.Signal(c.config.ParentDeathSignal)
 	return cmd
 }