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-rw-r--r--base/liblog_symbols.cpp83
1 files changed, 83 insertions, 0 deletions
diff --git a/base/liblog_symbols.cpp b/base/liblog_symbols.cpp
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+/*
+ * Copyright (C) 2020 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 "liblog_symbols.h"
+
+#if defined(__ANDROID__) && !defined(NO_LIBLOG_DLSYM)
+#include <dlfcn.h>
+#endif
+
+namespace android {
+namespace base {
+
+#if defined(__ANDROID__) && !defined(NO_LIBLOG_DLSYM)
+
+const std::optional<LibLogFunctions>& GetLibLogFunctions() {
+ static std::optional<LibLogFunctions> liblog_functions = []() -> std::optional<LibLogFunctions> {
+ void* liblog_handle = dlopen("liblog.so", RTLD_NOW);
+ if (liblog_handle == nullptr) {
+ return {};
+ }
+
+ LibLogFunctions real_liblog_functions = {};
+
+#define DLSYM(name) \
+ real_liblog_functions.name = \
+ reinterpret_cast<decltype(LibLogFunctions::name)>(dlsym(liblog_handle, #name)); \
+ if (real_liblog_functions.name == nullptr) { \
+ return {}; \
+ }
+
+ DLSYM(__android_log_set_logger)
+ DLSYM(__android_log_write_logger_data)
+ DLSYM(__android_log_logd_logger)
+ DLSYM(__android_log_stderr_logger)
+ DLSYM(__android_log_set_aborter)
+ DLSYM(__android_log_call_aborter)
+ DLSYM(__android_log_default_aborter)
+ DLSYM(__android_log_set_minimum_priority);
+ DLSYM(__android_log_get_minimum_priority);
+#undef DLSYM
+
+ return real_liblog_functions;
+ }();
+
+ return liblog_functions;
+}
+
+#else
+
+const std::optional<LibLogFunctions>& GetLibLogFunctions() {
+ static std::optional<LibLogFunctions> liblog_functions = []() -> std::optional<LibLogFunctions> {
+ return LibLogFunctions{
+ .__android_log_set_logger = __android_log_set_logger,
+ .__android_log_write_logger_data = __android_log_write_logger_data,
+ .__android_log_logd_logger = __android_log_logd_logger,
+ .__android_log_stderr_logger = __android_log_stderr_logger,
+ .__android_log_set_aborter = __android_log_set_aborter,
+ .__android_log_call_aborter = __android_log_call_aborter,
+ .__android_log_default_aborter = __android_log_default_aborter,
+ .__android_log_set_minimum_priority = __android_log_set_minimum_priority,
+ .__android_log_get_minimum_priority = __android_log_get_minimum_priority,
+ };
+ }();
+ return liblog_functions;
+}
+
+#endif
+
+} // namespace base
+} // namespace android