udevd: event - fix event queue in daemenozied mode

We would enforce that events could only be added to the queue from the
main process, but that brake in daemonized mode. Relax the restriction
to only allow one process to add events to the queue.

Reported by Mantas Mikulėnas.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/udev/udevd.c b/src/udev/udevd.c
index 4a44b03143..b33a262ffc 100644
--- a/src/udev/udevd.c
+++ b/src/udev/udevd.c
@@ -564,7 +564,10 @@ static int event_queue_insert(Manager *manager, struct udev_device *dev) {
         assert(manager);
         assert(dev);
 
-        /* only the main process can add events to the queue */
+        /* only one process can add events to the queue */
+        if (manager->pid == 0)
+                manager->pid = getpid();
+
         assert(manager->pid == getpid());
 
         event = new0(struct event, 1);
@@ -1300,8 +1303,6 @@ static int manager_new(Manager **ret) {
         if (!manager)
                 return log_oom();
 
-        manager->pid = getpid();
-
         manager->fd_ep = -1;
         manager->fd_ctrl = -1;
         manager->fd_uevent = -1;