diff -r 000000000000 -r 6474c204b198 nsprpub/pr/tests/logfile.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nsprpub/pr/tests/logfile.c	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * A regression test for bug 491441.  NSPR should not crash on startup in
+ * PR_SetLogFile when the NSPR_LOG_MODULES and NSPR_LOG_FILE environment
+ * variables are set.
+ *
+ * This test could be extended to be a full-blown test for NSPR_LOG_FILE.
+ */
+
+#include "prinit.h"
+#include "prlog.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    PRLogModuleInfo *test_lm;
+
+    if (putenv("NSPR_LOG_MODULES=all:5") != 0) {
+        fprintf(stderr, "putenv failed\n");
+        exit(1);
+    }
+    if (putenv("NSPR_LOG_FILE=logfile.log") != 0) {
+        fprintf(stderr, "putenv failed\n");
+        exit(1);
+    }
+
+    PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+    test_lm = PR_NewLogModule("test");
+    PR_LOG(test_lm, PR_LOG_MIN, ("logfile: test log message"));
+    PR_Cleanup();
+    return 0;
+}