sd-event: improve debug message when we fail to remove and fd from an epoll

Let's help users to debug issues with epoll fd removal by printing the
name of the event source.

diff --git a/src/libelogind/sd-event/sd-event.c b/src/libelogind/sd-event/sd-event.c
index 871ea8d60c2c1f5a26c28dea1015108bd159fdde..a14ade221b3ae89b76a6eccc5e76e8f23f6586f1 100644 (file)
--- a/src/libelogind/sd-event/sd-event.c
+++ b/src/libelogind/sd-event/sd-event.c
@@ -481,7 +481,8 @@ static void source_io_unregister(sd_event_source *s) {
                 return;
 
         r = epoll_ctl(s->event->epoll_fd, EPOLL_CTL_DEL, s->io.fd, NULL);
-        assert_log(r >= 0);
+        if (r < 0)
+                log_debug_errno(errno, "Failed to remove source %s from epoll: %m", strna(s->description));
 
         s->io.registered = false;
 }