Force rereading TZDEFRULES after it was used to set DST rules only (bug #19253)

If the TZDEFRULES file was used to set the DST rules when $TZ didn't
provide any we need to make sure that the next time it is used we
recompute everything as __tzfile_default changes some setting from what is
provided by TZDEFRULES.

1 files changed, 50 insertions, 0 deletions

diff --git a/time/tst-tzname.c b/time/tst-tzname.c
new file mode 100644
index 0000000000..ea7ec927b2
--- /dev/null
+++ b/time/tst-tzname.c
@@ -0,0 +1,50 @@
+/* Test that tzset sets tzname correctly (BZ #19253).
+   Copyright (C) 2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library 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.
+
+   The GNU C Library 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 the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+static int
+do_test (void)
+{
+  int result = 0;
+
+  setenv ("TZ", TZDEFRULES, 1);
+  tzset ();
+  const char *stdtz = strdup (tzname[0]);
+  setenv ("TZ", "STD-1DST", 1);
+  tzset ();
+  if (strcmp (tzname[0], "STD") != 0)
+    {
+      printf ("FAIL: TZ=STD-1DST, tzname[0] = %s\n", tzname[0]);
+      result = 1;
+    }
+  setenv ("TZ", TZDEFRULES, 1);
+  tzset ();
+  if (strcmp (tzname[0], stdtz) != 0)
+    {
+      printf ("FAIL: TZ=%s, tzname[0] = %s\n", TZDEFRULES, tzname[0]);
+      result = 1;
+    }
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"