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 <cstring>
18 #include <js_native_api_types.h>
19 #include <link.h>
20
21 #define PARAM_0 0
22 #define PARAM_1 1
23
callback(struct dl_phdr_info * info,size_t size,void * data)24 static int callback(struct dl_phdr_info *info, size_t size, void *data)
25 {
26 void *addrhead = (void *)(info->dlpi_addr + info->dlpi_phdr[0].p_vaddr);
27 if ((strcmp(info->dlpi_name, "/data/libtest.so") == PARAM_0) && (addrhead != nullptr)) {
28 return PARAM_1;
29 }
30 return PARAM_0;
31 }
Dl_iterate_phdr(napi_env env,napi_callback_info info)32 static napi_value Dl_iterate_phdr(napi_env env, napi_callback_info info)
33 {
34 void *ptr = nullptr;
35 int ret = dl_iterate_phdr(callback, ptr);
36 napi_value result = nullptr;
37 napi_create_int32(env, ret, &result);
38 return result;
39 }
40
41 EXTERN_C_START
Init(napi_env env,napi_value exports)42 static napi_value Init(napi_env env, napi_value exports)
43 {
44 napi_property_descriptor desc[] = {
45 {"dl_iterate_phdr", nullptr, Dl_iterate_phdr, nullptr, nullptr, nullptr, napi_default, nullptr},
46 };
47 napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
48 return exports;
49 }
50 EXTERN_C_END
51
52 static napi_module demoModule = {
53 .nm_version = 1,
54 .nm_flags = 0,
55 .nm_filename = nullptr,
56 .nm_register_func = Init,
57 .nm_modname = "liblinkndk",
58 .nm_priv = ((void *)0),
59 .reserved = {0},
60 };
61
RegisterModule(void)62 extern "C" __attribute__((constructor)) void RegisterModule(void) { napi_module_register(&demoModule); }
63