Merge branch 'pan/local_univ_time_bsd/OTP-8580' into dev

* pan/local_univ_time_bsd/OTP-8580:
  Teach erl_time_sup to handle timezones w/o DST on FreeBSD as on other platforms

3 files changed, 59 insertions, 1 deletions

diff --git a/erts/configure.in b/erts/configure.in
index d5dccdbb83..6b494ef127 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1719,6 +1719,9 @@ AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlop
 		gethrtime localtime_r gmtime_r mmap mremap memcpy mallopt \
 		sbrk _sbrk __sbrk brk _brk __brk \
 		flockfile fstat strlcpy strlcat setsid posix2time setlocale nl_langinfo poll])
+
+AC_CHECK_DECLS([posix2time],,,[#include <time.h>])
+
 if test "X$host" = "Xwin32"; then
 	ac_cv_func_setvbuf_reversed=yes
 fi
diff --git a/erts/emulator/beam/erl_time_sup.c b/erts/emulator/beam/erl_time_sup.c
index c15f85f8f1..7b8706ea13 100644
--- a/erts/emulator/beam/erl_time_sup.c
+++ b/erts/emulator/beam/erl_time_sup.c
@@ -650,6 +650,22 @@ local_to_univ(Sint *year, Sint *month, Sint *day,
     t.tm_sec = *second;
     t.tm_isdst = isdst;
     the_clock = mktime(&t);
+    if (the_clock == -1) {
+	if (isdst) {
+	    /* If this is a timezone without DST and the OS (correctly)
+	       refuses to give us a DST time, we simulate the Linux/Solaris
+	       behaviour of giving the same data as if is_dst was not set. */
+	    t.tm_isdst = 0;
+	    the_clock = mktime(&t);
+	    if (the_clock == -1) {
+		/* Failed anyway, something else is bad - will be a badarg */
+		return 0;
+	    }
+	} else {
+	    /* Something else is the matter, badarg. */
+	    return 0;
+	}
+    }
 #ifdef HAVE_GMTIME_R
     gmtime_r(&the_clock, (tm = &tmbuf));
 #else
@@ -663,6 +679,10 @@ local_to_univ(Sint *year, Sint *month, Sint *day,
     *second = tm->tm_sec;
     return 1;
 }
+#if defined(HAVE_POSIX2TIME) && defined(HAVE_DECL_POSIX2TIME) && \
+    !HAVE_DECL_POSIX2TIME
+extern time_t posix2time(time_t);
+#endif
 
 int 
 univ_to_local(Sint *year, Sint *month, Sint *day, 
diff --git a/erts/emulator/test/time_SUITE.erl b/erts/emulator/test/time_SUITE.erl
index 2ad1f0d201..095e9dd1af 100644
--- a/erts/emulator/test/time_SUITE.erl
+++ b/erts/emulator/test/time_SUITE.erl
@@ -34,6 +34,8 @@
 	 consistency/1,
 	 now/1, now_unique/1, now_update/1, timestamp/1]).
 
+-export([local_to_univ_utc/1]).
+
 -include("test_server.hrl").
 
 -export([linear_time/1]).
@@ -53,7 +55,40 @@
 -define(dst_timezone, 2).
 
 all(suite) -> [univ_to_local, local_to_univ,
-	       bad_univ_to_local, bad_local_to_univ, consistency, now, timestamp].
+	       local_to_univ_utc,
+	       bad_univ_to_local, bad_local_to_univ,
+	       consistency, now, timestamp].
+
+local_to_univ_utc(suite) ->
+    [];
+local_to_univ_utc(doc) ->
+    ["Test that DST = true on timezones without DST is ignored"];
+local_to_univ_utc(Config) when is_list(Config) ->
+    case os:type() of
+	{unix,_} ->
+	    %% TZ variable has a meaning
+	    ?line {ok, Node} =
+		test_server:start_node(local_univ_utc,peer,
+				       [{args, "-env TZ UTC"}]),
+	    ?line {{2008,8,1},{0,0,0}} =
+		rpc:call(Node,
+			 erlang,localtime_to_universaltime,
+			 [{{2008, 8, 1}, {0, 0, 0}},
+			  false]),
+	    ?line {{2008,8,1},{0,0,0}} =
+		rpc:call(Node,
+			 erlang,localtime_to_universaltime,
+			 [{{2008, 8, 1}, {0, 0, 0}},
+			  true]),
+	    ?line [{{2008,8,1},{0,0,0}}] =
+		rpc:call(Node,
+			 calendar,local_time_to_universal_time_dst,
+			 [{{2008, 8, 1}, {0, 0, 0}}]),
+	    ?line test_server:stop_node(Node),
+	    ok;
+	_ ->
+	    {skip,"Only valid on Unix"}
+    end.
 
 
 %% Tests conversion from univeral to local time.