nixio: Fix accidental closing of file descriptors after dup with two

parameters resulting in strange behaviour when spawning processes

diff --git a/libs/nixio/src/file.c b/libs/nixio/src/file.c
index 482752522737682cbad8e83203b605fd83446ff8..70c717e4e17e62ca8bcce6899ecf0d012d724a09 100644 (file)
--- a/libs/nixio/src/file.c
+++ b/libs/nixio/src/file.c
@@ -123,14 +123,18 @@ static int nixio_dup(lua_State *L) {
        if (stat == -1) {
                return nixio__perror(L);
        } else {
-               int *udata = lua_newuserdata(L, sizeof(int));
-               if (!udata) {
-                       return luaL_error(L, "out of memory");
-               }
+               if (newfd == -1) {
+                       int *udata = lua_newuserdata(L, sizeof(int));
+                       if (!udata) {
+                               return luaL_error(L, "out of memory");
+                       }
 
-               *udata = stat;
-               luaL_getmetatable(L, NIXIO_FILE_META);
-               lua_setmetatable(L, -2);
+                       *udata = stat;
+                       luaL_getmetatable(L, NIXIO_FILE_META);
+                       lua_setmetatable(L, -2);
+               } else {
+                       lua_pushvalue(L, 2);
+               }
                return 1;
        }
 }