[Tarantool-patches] [PATCH luajit 2/2] Make check in os.time() consistent.

[Evgeniy Temirgaleev]

From: Mike Pall <mike>

Thanks to Temir Galeev. #1470

(cherry picked from commit 295d45fb26de56498782c94594f31b97aef744ef)

This patch prevents os.time() to return nil, when machine time is -1
and some error occurs before os.time() call. In fact, this is
a theoretical case, so no tests were added.

Temir Galeev:
* added the description for the patch

Part of tarantool/tarantool#12480
---
 src/lib_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib_os.c b/src/lib_os.c
index f6841357..d4054eae 100644
--- a/src/lib_os.c
+++ b/src/lib_os.c
@@ -229,6 +229,7 @@ LJLIB_CF(os_date)
 LJLIB_CF(os_time)
 {
   time_t t;
+  errno = 0;
   if (lua_isnoneornil(L, 1)) {  /* called without args? */
     t = time(NULL);  /* get current time */
   } else {
@@ -242,7 +243,6 @@ LJLIB_CF(os_time)
     ts.tm_mon = getfield(L, "month", -1) - 1;
     ts.tm_year = getfield(L, "year", -1) - 1900;
     ts.tm_isdst = getboolfield(L, "isdst");
-    errno = 0;
     t = mktime(&ts);
   }
   if (t == (time_t)(-1) && errno != 0)
-- 
2.49.0