blob: ad4fb31ef3fb4c144f605163c6a8d43351973bc7 [file] [log] [blame]
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "vndksupport"
#include "linker.h"
#include <android/dlext.h>
#include <dlfcn.h>
#include <log/log.h>
#include <sys/types.h>
#include <unistd.h>
#include <initializer_list>
extern "C" android_namespace_t* android_get_exported_namespace(const char*);
namespace {
struct VendorNamespace {
android_namespace_t* ptr = nullptr;
const char* name = nullptr;
};
} // anonymous namespace
static VendorNamespace get_vendor_namespace() {
static VendorNamespace result = ([] {
for (const char* name : {"sphal", "vendor", "default"}) {
if (android_namespace_t* ns = android_get_exported_namespace(name)) {
return VendorNamespace{ns, name};
}
}
return VendorNamespace{};
})();
return result;
}
int android_is_in_vendor_process() {
// Special case init, since when init runs, ld.config.<ver>.txt hasn't been
// loaded (sysprop service isn't up for init to know <ver>).
if (getpid() == 1) {
return 0;
}
// In vendor process, 'vndk' namespace is not visible, whereas in system
// process, it is.
return android_get_exported_namespace("vndk") == nullptr;
}
void* android_load_sphal_library(const char* name, int flag) {
VendorNamespace vendor_namespace = get_vendor_namespace();
if (vendor_namespace.ptr != nullptr) {
const android_dlextinfo dlextinfo = {
.flags = ANDROID_DLEXT_USE_NAMESPACE,
.library_namespace = vendor_namespace.ptr,
};
void* handle = android_dlopen_ext(name, flag, &dlextinfo);
if (!handle) {
ALOGE("Could not load %s from %s namespace: %s.", name, vendor_namespace.name,
dlerror());
}
return handle;
} else {
ALOGD("Loading %s from current namespace instead of sphal namespace.", name);
return dlopen(name, flag);
}
}
int android_unload_sphal_library(void* handle) {
return dlclose(handle);
}