conntrackd: reduce the number of gettimeofday() syscalls

This patch reduces the number of gettimeofday syscalls by caching
the current time in a variable at the beginning of the main loop.
Based on a suggestion from Vincent Jardin.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/date.c b/src/date.c
new file mode 100644
index 0000000..f5a5ada
--- /dev/null
+++ b/src/date.c
@@ -0,0 +1,28 @@
+/*
+ * (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include "date.h"
+#include <stdlib.h>
+#include <string.h>
+
+static struct timeval now;
+
+int do_gettimeofday(void)
+{
+	return gettimeofday(&now, NULL);
+}
+
+void gettimeofday_cached(struct timeval *tv)
+{
+	memcpy(tv, &now, sizeof(struct timeval));
+}
+
+int time_cached(void)
+{
+	return now.tv_sec;
+}