1 // 2 // Copyright 2015 Google, Inc. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at: 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #define LOG_TAG "hal_util" 18 19 #include <base/logging.h> 20 #include <base/strings/stringprintf.h> 21 #include <hardware/bluetooth.h> 22 23 #include <dlfcn.h> 24 #include <errno.h> 25 #include <string.h> 26 27 #include "btcore/include/hal_util.h" 28 #include "osi/include/log.h" 29 30 using base::StringPrintf; 31 32 #define BLUETOOTH_LIBRARY_NAME "libbluetooth.so" 33 34 int hal_util_load_bt_library(const bt_interface_t** interface) { 35 const char* sym = BLUETOOTH_INTERFACE_STRING; 36 bt_interface_t* itf = nullptr; 37 38 // Always try to load the default Bluetooth stack on GN builds. 39 void* handle = dlopen(BLUETOOTH_LIBRARY_NAME, RTLD_NOW); 40 if (!handle) { 41 const char* err_str = dlerror(); 42 LOG(ERROR) << __func__ << ": failed to load bluetooth library, error=" 43 << (err_str ? err_str : "error unknown"); 44 goto error; 45 } 46 47 // Get the address of the bt_interface_t. 48 itf = (bt_interface_t*)dlsym(handle, sym); 49 if (!itf) { 50 LOG(ERROR) << __func__ << ": failed to load symbol from Bluetooth library " 51 << sym; 52 goto error; 53 } 54 55 // Success. 56 LOG(INFO) << __func__ << " loaded HAL path=" << BLUETOOTH_LIBRARY_NAME 57 << " btinterface=" << itf << " handle=" << handle; 58 59 *interface = itf; 60 return 0; 61 62 error: 63 *interface = NULL; 64 if (handle) dlclose(handle); 65 66 return -EINVAL; 67 } 68
