1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "napi/native_api.h"
17 #include <fcntl.h>
18 #include <js_native_api_types.h>
19 #include <sys/swap.h>
20 #include <unistd.h>
21
22 #define INIT (-1)
23 #define SUCCESS 0
24 #define PARAM_1 1
25 #define MPARAM_1 (-1)
26 #define PARAM_0777 0777
27
SwapOn(napi_env env, napi_callback_info info)28 static napi_value SwapOn(napi_env env, napi_callback_info info)
29 {
30 int flags = SWAP_FLAG_PREFER, backParam = PARAM_1;
31 const char *path = "/data/storage/el2/base/files/Fzl.txt";
32 int fd = open(path, O_CREAT, PARAM_0777);
33 backParam = swapon(path, flags);
34 close(fd);
35 napi_value result = nullptr;
36 napi_create_int32(env, backParam, &result);
37 return result;
38 }
39
SwapOff(napi_env env, napi_callback_info info)40 static napi_value SwapOff(napi_env env, napi_callback_info info)
41 {
42 int flags = SWAP_FLAG_PREFER, checkParam, backParam = PARAM_1;
43 const char *path = "/data/storage/el2/base/files/Fzl.txt";
44 int fd = open(path, O_CREAT, PARAM_0777);
45 checkParam = swapon(path, flags);
46 if (checkParam != MPARAM_1) {
47 backParam = swapoff(path);
48 }
49 close(fd);
50 napi_value result = nullptr;
51 napi_create_int32(env, backParam, &result);
52 return result;
53 }
54
55 EXTERN_C_START
Init(napi_env env, napi_value exports)56 static napi_value Init(napi_env env, napi_value exports)
57 {
58 napi_property_descriptor desc[] = {
59 {"swapon", nullptr, SwapOn, nullptr, nullptr, nullptr, napi_default, nullptr},
60 {"swapoff", nullptr, SwapOff, nullptr, nullptr, nullptr, napi_default, nullptr},
61 };
62 napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
63 return exports;
64 }
65 EXTERN_C_END
66
67 static napi_module demoModule = {
68 .nm_version = 1,
69 .nm_flags = 0,
70 .nm_filename = nullptr,
71 .nm_register_func = Init,
72 .nm_modname = "libswapndk",
73 .nm_priv = ((void *)0),
74 .reserved = {0},
75 };
76
RegisterModule(void)77 extern "C" __attribute__((constructor)) void RegisterModule(void) { napi_module_register(&demoModule); }
78