From d1f36cf75e9d728630c862cb3cc8cbe87f8c6f15 Mon Sep 17 00:00:00 2001
From: "Nicholas J. Kain" <nicholas@kain.us>
Date: Tue, 28 Jun 2011 13:47:36 -0400
Subject: [PATCH] fsync() the leasefile after writing a new lease IP so that
 it's instantly updated to disk.

---
 ndhc/leasefile.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ndhc/leasefile.c b/ndhc/leasefile.c
index 99a40eb..4dc8d57 100644
--- a/ndhc/leasefile.c
+++ b/ndhc/leasefile.c
@@ -74,4 +74,6 @@ void write_leasefile(struct in_addr ipnum)
     ret = safe_write(leasefilefd, ip, strlen(ip));
     if (ret == -1)
         log_warning("Failed to write ip to lease file.\n");
+    else
+        fsync(leasefilefd);
 }