| // |
| // Copyright 2015 Google, Inc. |
| // |
| // 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 "hal_util" |
| |
| #include <base/logging.h> |
| #include <base/strings/stringprintf.h> |
| #include <hardware/bluetooth.h> |
| |
| #include <dlfcn.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "btcore/include/hal_util.h" |
| #include "osi/include/log.h" |
| |
| using base::StringPrintf; |
| |
| #define BLUETOOTH_LIBRARY_NAME "libbluetooth.so" |
| |
| int hal_util_load_bt_library(const bt_interface_t** interface) { |
| const char* sym = BLUETOOTH_INTERFACE_STRING; |
| bt_interface_t* itf = nullptr; |
| |
| // Always try to load the default Bluetooth stack on GN builds. |
| void* handle = dlopen(BLUETOOTH_LIBRARY_NAME, RTLD_NOW); |
| if (!handle) { |
| const char* err_str = dlerror(); |
| LOG(ERROR) << __func__ << ": failed to load bluetooth library, error=" |
| << (err_str ? err_str : "error unknown"); |
| goto error; |
| } |
| |
| // Get the address of the bt_interface_t. |
| itf = (bt_interface_t*)dlsym(handle, sym); |
| if (!itf) { |
| LOG(ERROR) << __func__ << ": failed to load symbol from Bluetooth library " |
| << sym; |
| goto error; |
| } |
| |
| // Success. |
| LOG(INFO) << __func__ << " loaded HAL path=" << BLUETOOTH_LIBRARY_NAME |
| << " btinterface=" << itf << " handle=" << handle; |
| |
| *interface = itf; |
| return 0; |
| |
| error: |
| *interface = NULL; |
| if (handle) dlclose(handle); |
| |
| return -EINVAL; |
| } |