From 792576de0140a4fc9050a2533b8761c0b997b547 Mon Sep 17 00:00:00 2001
From: Ben Pfaff <blp@nicira.com>
Date: Wed, 16 Jul 2008 17:50:06 -0700
Subject: [PATCH] Log an error when the time is negative at vlog startup.

---
 include/vlog.h |  1 +
 lib/vlog.c     | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/include/vlog.h b/include/vlog.h
index d4661629..068a6277 100644
--- a/include/vlog.h
+++ b/include/vlog.h
@@ -83,6 +83,7 @@ enum vlog_facility vlog_get_facility_val(const char *name);
         VLOG_MODULE(vconn_tcp)                  \
         VLOG_MODULE(vconn_ssl)                  \
         VLOG_MODULE(vconn)                      \
+        VLOG_MODULE(vlog)                       \
 
 /* VLM_ constant for each vlog module. */
 enum vlog_module {
diff --git a/lib/vlog.c b/lib/vlog.c
index 8cd0c271..17be077a 100644
--- a/lib/vlog.c
+++ b/lib/vlog.c
@@ -44,6 +44,8 @@
 #include "dynamic-string.h"
 #include "util.h"
 
+#define THIS_MODULE VLM_vlog
+
 /* Name for each logging level. */
 static const char *level_names[VLL_N_LEVELS] = {
     [VLL_EMER] = "EMER",
@@ -251,8 +253,18 @@ vlog_set_verbosity(const char *arg)
 void
 vlog_init(void) 
 {
+    time_t now;
     openlog(program_name, LOG_NDELAY, LOG_DAEMON);
     vlog_set_levels(VLM_ANY_MODULE, VLF_CONSOLE, VLL_WARN);
+    now = time(0);
+    if (now < 0) {
+        struct tm tm;
+        char s[128];
+
+        localtime_r(&now, &tm);
+        strftime(s, sizeof s, "%a, %d %b %Y %H:%M:%S %z", &tm);
+        VLOG_ERR("current time is negative: %s (%ld)", s, (long int) now);
+    }
 }
 
 /* Closes the logging subsystem. */
-- 
2.30.2