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 extern struct android_namespace_t* android_get_exported_namespace(const char*);
25
26 static const char* namespace_name = NULL;
27
get_vendor_namespace()28 static struct android_namespace_t* get_vendor_namespace() {
29 const char* namespace_names[] = {"sphal", "default", NULL};
30 static struct android_namespace_t* vendor_namespace = NULL;
31 if (vendor_namespace == NULL) {
32 int name_idx = 0;
33 while (namespace_names[name_idx] != NULL) {
34 vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]);
35 if (vendor_namespace != NULL) {
36 namespace_name = namespace_names[name_idx];
37 break;
38 }
39 name_idx++;
40 }
41 }
42 return vendor_namespace;
43 }
44
android_load_sphal_library(const char * name,int flag)45 void* android_load_sphal_library(const char* name, int flag) {
46 struct android_namespace_t* vendor_namespace = get_vendor_namespace();
47 if (vendor_namespace != NULL) {
48 const android_dlextinfo dlextinfo = {
49 .flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = vendor_namespace,
50 };
51 void* handle = android_dlopen_ext(name, flag, &dlextinfo);
52 if (!handle) {
53 ALOGE("Could not load %s from %s namespace: %s.", name, namespace_name, dlerror());
54 }
55 return handle;
56 } else {
57 ALOGD("Loading %s from current namespace instead of sphal namespace.", name);
58 return dlopen(name, flag);
59 }
60 }
61
android_unload_sphal_library(void * handle)62 int android_unload_sphal_library(void* handle) {
63 return dlclose(handle);
64 }
65