machined: keep track of the initial leader PID of a machine

This way we can without races always determine the machine for a leader
PID. This allows machine managers to query the machine for a forked off
container/VM  without a race where the child might already have died
before we could read the cgroup information from /proc/$PID/cgroup.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/machine/machined.h b/src/machine/machined.h
index dfb63bd7f1..3f07d4dd8e 100644
--- a/src/machine/machined.h
+++ b/src/machine/machined.h
@@ -40,6 +40,7 @@ struct Manager {
 
         Hashmap *machines;
         Hashmap *machine_units;
+        Hashmap *machine_leaders;
 
         LIST_HEAD(Machine, machine_gc_queue);
 };