sd-event: do not update signal fd after PID is changed

Otherwise, child event source will not work after the process is forked
and the event source is unref()ed on the child process.

diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index e7c3fcd37c66051e79c4a2201c8614ff3e8ebb81..ca90890442ec05918e044cee3fe42b9ee0e06529 100644 (file)
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -706,6 +706,9 @@ static void event_unmask_signal_data(sd_event *e, struct signal_data *d, int sig
                 return;
         }
 
+        if (event_pid_changed(e))
+                return;
+
         assert(d->fd >= 0);
 
         if (signalfd(d->fd, &d->sigset, SFD_NONBLOCK|SFD_CLOEXEC) < 0)