add libvndksupport (7130e132) · Commits · e / os / android_system_core

libvndksupport/Android.bp

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		subdirs = ["tests"]

		cc_library_shared {
		name: "libvndksupport",
		srcs: ["linker.c"],
		local_include_dirs: ["include/vndksupport"],
		export_include_dirs: ["include"],
		shared_libs: ["liblog"],
		}

		llndk_library {
		name: "libvndksupport",
		symbol_file: "libvndksupport.map.txt",
		export_include_dirs: ["include"],
		}

libvndksupport/include/vndksupport/linker.h

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		/*
		* 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.
		*/
		#ifndef VNDKSUPPORT_LINKER_H_
		#define VNDKSUPPORT_LINKER_H_

		#ifdef __cplusplus
		extern "C" {
		#endif

		void* android_load_sphal_library(const char* name, int flag);

		int android_unload_sphal_library(void* handle);

		#ifdef __cplusplus
		}
		#endif

		#endif // VNDKSUPPORT_LINKER_H_

libvndksupport/libvndksupport.map.txt

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		LIBVNDKSUPPORT {
		global:
		android_load_sphal_library; # vndk
		android_unload_sphal_library; # vndk
		local:
		*;
		};

libvndksupport/linker.c

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		/*
		* 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>

		extern struct android_namespace_t* android_get_exported_namespace(const char*);

		void* android_load_sphal_library(const char* name, int flag) {
		struct android_namespace_t* sphal_namespace = android_get_exported_namespace("sphal");
		if (sphal_namespace != NULL) {
		const android_dlextinfo dlextinfo = {
		.flags = ANDROID_DLEXT_USE_NAMESPACE, .library_namespace = sphal_namespace,
		};
		void* handle = android_dlopen_ext(name, flag, &dlextinfo);
		if (handle) {
		return handle;
		} else {
		ALOGW(
		"Could not load %s from sphal namespace: %s. "
		"Falling back to loading it from the current namespace,",
		name, dlerror());
		}
		} else {
		ALOGI(
		"sphal namespace is not configured for this process. "
		"Loading %s from the current namespace instead.",
		name);
		}
		return dlopen(name, flag);
		}

		int android_unload_sphal_library(void* handle) {
		return dlclose(handle);
		}

libvndksupport/tests/Android.bp

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		// 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.

		cc_test {
		name: "libvndksupport-tests",
		srcs: [
		"linker_test.cpp",
		],

		host_supported: false,
		shared_libs: [
		"libvndksupport",
		"libbase",
		]
		}