1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #include "linker.h"
17
18 #include <android/dlext.h>
19 #include <dlfcn.h>
20
21 #define LOG_TAG "vndksupport"
22 #include <log/log.h>
23
24 __attribute__((weak)) extern struct android_namespace_t* android_get_exported_namespace(const char*);
25 __attribute__((weak)) extern void* android_dlopen_ext(const char*, int, const android_dlextinfo*);
26
27 static const char* namespace_name = NULL;
28
get_vendor_namespace()29 static struct android_namespace_t* get_vendor_namespace() {
30 const char* namespace_names[] = {"sphal", "default", NULL};
31 static struct android_namespace_t* vendor_namespace = NULL;
32 if (vendor_namespace == NULL) {
33 int name_idx = 0;
34 while (namespace_names[name_idx] != NULL) {
35 if (android_get_exported_namespace != NULL) {
36 vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]);
37 }
38 if (vendor_namespace != NULL) {
39 namespace_name = namespace_names[name_idx];
40 break;
41 }
42 name_idx++;
43 }
44 }
45 return vendor_namespace;
46 }
47
android_load_sphal_library(const char * name,int flag)48 void* android_load_sphal_library(const char* name, int flag) {
49 struct android_namespace_t* vendor_namespace = get_vendor_namespace();
50 if (vendor_namespace != NULL) {
51 const android_dlextinfo dlextinfo = {
52 .flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = vendor_namespace,
53 };
54 void* handle = NULL;
55 if (android_dlopen_ext != NULL) {
56 handle = android_dlopen_ext(name, flag, &dlextinfo);
57 }
58 if (!handle) {
59 ALOGE("Could not load %s from %s namespace: %s.", name, namespace_name, dlerror());
60 }
61 return handle;
62 } else {
63 ALOGD("Loading %s from current namespace instead of sphal namespace.", name);
64 return dlopen(name, flag);
65 }
66 }
67
android_unload_sphal_library(void * handle)68 int android_unload_sphal_library(void* handle) {
69 return dlclose(handle);
70 }
71