qmeventd: explicitly close() pidfds

In most circumstances a pidfd gets closed automatically once the child
dies, and that *should* be guaranteed by us calling SIGKILL - however,
it seems that sometimes that doesn't happen, leading to leaked file
descriptors[0].

Also add a small note to verbose mode showing when the late-cleanup
actually happens, helped during debug.

[0] https://forum.proxmox.com/threads/cannot-shutdown-vm.83911/

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

diff --git a/qmeventd/qmeventd.c b/qmeventd/qmeventd.c
index 57f1867329b7068fdf226d9a677edf7a54f5ad9d..a14c3315c76e625cd278598f157f7c3ed5a16677 100644 (file)
--- a/qmeventd/qmeventd.c
+++ b/qmeventd/qmeventd.c
@@ -600,6 +600,7 @@ sigkill(void *ptr, __attribute__((unused)) void *unused)
 
     if (data.pidfd > 0) {
        err = pidfd_send_signal(data.pidfd, SIGKILL, NULL, 0);
+       (void)close(data.pidfd);
     } else {
        err = kill(data.pid, SIGKILL);
     }
@@ -619,6 +620,7 @@ static void
 handle_forced_cleanup()
 {
     if (alarm_triggered) {
+       VERBOSE_PRINT("clearing forced cleanup backlog\n");
        alarm_triggered = 0;
        g_slist_foreach(forced_cleanups, sigkill, NULL);
        g_slist_free_full(forced_cleanups, free);