Switch libvndksupport's linker.c to C++
Bug: none
Test: device boots
Change-Id: I64237006a7f903647c8d8f7ca681b1da23ac53a9
diff --git a/libvndksupport/linker.cpp b/libvndksupport/linker.cpp
new file mode 100644
index 0000000..057e5b197
--- /dev/null
+++ b/libvndksupport/linker.cpp
@@ -0,0 +1,91 @@
+/*
+ * 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.
+ */
+#include "linker.h"
+
+#include <android/dlext.h>
+#include <dlfcn.h>
+
+#define LOG_TAG "vndksupport"
+#include <log/log.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+__attribute__((weak)) extern "C" struct android_namespace_t* android_get_exported_namespace(
+ const char*);
+__attribute__((weak)) extern "C" void* android_dlopen_ext(const char*, int,
+ const android_dlextinfo*);
+
+static const char* namespace_name = NULL;
+
+static struct android_namespace_t* get_vendor_namespace() {
+ const char* namespace_names[] = {"sphal", "default", NULL};
+ static struct android_namespace_t* vendor_namespace = NULL;
+ if (vendor_namespace == NULL) {
+ int name_idx = 0;
+ while (namespace_names[name_idx] != NULL) {
+ if (android_get_exported_namespace != NULL) {
+ vendor_namespace = android_get_exported_namespace(namespace_names[name_idx]);
+ }
+ if (vendor_namespace != NULL) {
+ namespace_name = namespace_names[name_idx];
+ break;
+ }
+ name_idx++;
+ }
+ }
+ return vendor_namespace;
+}
+
+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;
+ }
+ if (android_get_exported_namespace == NULL) {
+ ALOGD("android_get_exported_namespace() not available. Assuming system process.");
+ return 0;
+ }
+
+ // In vendor process, 'vndk' namespace is not visible, whereas in system
+ // process, it is.
+ return android_get_exported_namespace("vndk") == NULL;
+}
+
+void* android_load_sphal_library(const char* name, int flag) {
+ struct android_namespace_t* vendor_namespace = get_vendor_namespace();
+ if (vendor_namespace != NULL) {
+ const android_dlextinfo dlextinfo = {
+ .flags = ANDROID_DLEXT_USE_NAMESPACE,
+ .library_namespace = vendor_namespace,
+ };
+ void* handle = NULL;
+ if (android_dlopen_ext != NULL) {
+ handle = android_dlopen_ext(name, flag, &dlextinfo);
+ }
+ if (!handle) {
+ ALOGE("Could not load %s from %s namespace: %s.", name, 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);
+}