Re: luaclose_mylib function (inverse of "luaopen_mylib" C function)
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- Subject: Re: luaclose_mylib function (inverse of "luaopen_mylib" C function)
- From: Andrew Gierth <andrew@...>
- Date: 2020年8月25日 23:47:09 +0100
>>>>> "bel" == bel <bel2125@gmail.com> writes:
bel> Thank you for your explanations. Using the registry works well in
bel> my tests, and it seems there is no way to break the sandbox from
bel> inside. In case someone is interested in the code, this worked for
bel> me:
bel> static int lua_regkey_dtor;
bel> lua_pushlightuserdata(L, &lua_regkey_dtor);
bel> lua_newuserdata(L, 0);
bel> lua_newtable(L);
bel> lua_pushliteral(L, "__gc");
bel> lua_pushlightuserdata(L, my_luaclose_argument);
bel> lua_pushcclosure(L, luaclose_mylib, 1);
bel> lua_rawset(L, -3);
bel> lua_setmetatable(L, -2);
bel> lua_settable(L, LUA_REGISTRYINDEX);
You can simplify:
lua_newuserdata(L, 0);
lua_newtable(L);
lua_pushlightuserdata(L, my_luaclose_argument);
lua_pushcclosure(L, luaclose_mylib, 1);
lua_setfield(L, -2, "__gc");
lua_setmetatable(L, -2);
lua_rawsetp(L, LUA_REGISTRYINDEX, &lua_regkey_dtor);
--
Andrew.