add skynet.context_ptr() & noneblocking socket.close

lualib-src/lua-skynet.c

@@ -385,6 +385,14 @@ _harbor(lua_State *L) {
 	return 2;
 }
 
+static int
+_context(lua_State *L) {
+	struct skynet_context * context = lua_touserdata(L, lua_upvalueindex(1));
+	lua_pushlightuserdata(L, context);
+
+	return 1;
+}
+
 // trace api
 static int
 _trace_new(lua_State *L) {
@@ -465,6 +473,7 @@ luaopen_skynet_c(lua_State *L) {
 		{ "error", _error },
 		{ "tostring", _tostring },
 		{ "harbor", _harbor },
+		{ "context", _context },
 		{ NULL, NULL },
 	};
 

lualib/skynet.lua

@@ -615,4 +615,8 @@ function skynet.abort()
 	c.command("ABORT")
 end
 
+function skynet.context_ptr()
+	return c.context()
+end
+
 return skynet

service-src/service_socket.c

@@ -49,6 +49,10 @@ struct socket_pool {
 
 static void
 reply(struct skynet_context * ctx, uint32_t source, int session, char * cmd, int sz) {
+	if (session == 0) {
+		// don't reply when session == 0
+		return;
+	}
 	if (sz < 0) {
 		sz = strlen(cmd);
 	}