[systemd-devel] [PATCH] Add timesync-wait tool

[Łukasz Stelmach]

---
 src/timesync/timesync-wait.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 src/timesync/timesync-wait.c

I am afraid TFD_TIMER_CANCEL_ON_SET doesn't help much here. You can
watch for time changes but it is not the moment adjtimex() starts to
return TIME_OK and STA_UNSYNC flag unset.

Where would you like this to be patched in?

diff --git a/src/timesync/timesync-wait.c b/src/timesync/timesync-wait.c
new file mode 100644
index 0000000..9648b09
--- /dev/null
+++ b/src/timesync/timesync-wait.c
@@ -0,0 +1,43 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Łukasz Stelmach
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <string.h>
+#include <sys/timex.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+        struct timex tbuf;
+        int r;
+
+        memset(&tbuf, 0, sizeof(tbuf));
+        r = adjtimex(&tbuf);
+
+        while (r != TIME_OK) {
+                sleep(1);
+                /* Unfortunately there seem to be no other way than
+                polling to get this information. */
+                memset(&tbuf, 0, sizeof(tbuf));
+                r = adjtimex(&tbuf);
+        }
+
+        return 0;
+}
-- 
2.0.4