ref: 3654451f1948e59b1f99d7bb6efb1283714d246d dir: /proc.c/
static int p9_rfork(lua_State *L) { lua_Integer flags; int r; flags = luaL_checkinteger(L, 1); if((r = rfork(flags)) == -1) lerror(L, "rfork"); lua_pushinteger(L, r); return 1; }