Add microdroid_launcher
microdroid_launcher is a very thin executable that loads a shared
library and execute the entry function (android_native_main). This is
used to execute a shared library in an APK that is shared from the host
Android.
Bug: 188513012
Test: atest MicrodroidHostTestCases
Change-Id: I0f98eba4c72601adaa27733dae6a51d3852301db
diff --git a/launcher/Android.bp b/launcher/Android.bp
new file mode 100644
index 0000000..2c3f093
--- /dev/null
+++ b/launcher/Android.bp
@@ -0,0 +1,9 @@
+package {
+ default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+cc_binary {
+ name: "microdroid_launcher",
+ srcs: ["main.cpp"],
+ shared_libs: ["libdl"],
+}
diff --git a/launcher/main.cpp b/launcher/main.cpp
new file mode 100644
index 0000000..fc9477d
--- /dev/null
+++ b/launcher/main.cpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 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 <dlfcn.h>
+
+#include <cstdlib>
+#include <iostream>
+
+int main(int argc, char* argv[]) {
+ if (argc < 2) {
+ std::cout << "Usage:\n";
+ std::cout << " " << argv[0] << " LIBNAME [ARGS...]\n";
+ return EXIT_FAILURE;
+ }
+
+ const char* libname = argv[1];
+ void* handle = dlopen(libname, RTLD_NOW);
+ if (handle == nullptr) {
+ std::cerr << "Failed to load " << libname << ": " << dlerror() << "\n";
+ return EXIT_FAILURE;
+ }
+
+ int (*entry)(int argc, char* argv[]) = nullptr;
+ entry = reinterpret_cast<decltype(entry)>(dlsym(handle, "android_native_main"));
+ if (entry == nullptr) {
+ std::cerr << "Failed to find entrypoint `android_native_main`: " << dlerror() << "\n";
+ return EXIT_FAILURE;
+ }
+
+ return entry(argc - 1, argv + 1);
+}