In kpropd, poll after finishing resync

When kpropd operates in iprop mode, full resyncs are handled by a
child process.  After a full resync, we want to poll for incremental
updates, as the dump we received may have come from a pre-existing
dump file which was not current.  To make this polling happen
promptly, signal the parent process from the child process after a
dump is received.

With this change, t_iprop.py no longer has to prod kpropd after a full
resync occurs, so remove that logic.

ticket: 8161

1 files changed, 5 insertions, 1 deletions

diff --git a/src/slave/kpropd.c b/src/slave/kpropd.c
index 18a8e1d..1bac58e 100644
--- a/src/slave/kpropd.c
+++ b/src/slave/kpropd.c
@@ -298,7 +298,7 @@ main(int argc, char **argv)
     /*
      * This is the iprop case.  We'll fork a child to run do_standalone().  The
      * parent will run do_iprop().  We try to kill the child if we get killed.
-     * Catch SIGUSR1 so tests can use it to interrupt the sleep timer and force
+     * Catch SIGUSR1, which can be used to interrupt the sleep timer and force
      * an iprop request.
      */
     signal_wrapper(SIGHUP, kill_do_standalone);
@@ -440,6 +440,10 @@ do_standalone()
 
             close(s);
 
+            /* If we are the fullprop child in iprop mode, notify the parent
+             * process that it should poll for incremental updates. */
+            if (fullprop_child == 0)
+                kill(getppid(), SIGUSR1);
             if (runonce)
                 exit(0);
         }