//
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// Copyright 2015 Google, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#define LOG_TAG "hal_util"
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#include <base/logging.h>
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#include <base/strings/stringprintf.h>
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#include <hardware/bluetooth.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <string.h>
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#include "btcore/include/hal_util.h"
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#include "osi/include/log.h"
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using base::StringPrintf;
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#define BLUETOOTH_LIBRARY_NAME "libbluetooth.so"
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int hal_util_load_bt_library(const bt_interface_t** interface) {
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const char* sym = BLUETOOTH_INTERFACE_STRING;
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bt_interface_t* itf = nullptr;
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// Always try to load the default Bluetooth stack on GN builds.
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void* handle = dlopen(BLUETOOTH_LIBRARY_NAME, RTLD_NOW);
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if (!handle) {
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const char* err_str = dlerror();
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LOG(ERROR) << __func__ << ": failed to load bluetooth library, error="
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<< (err_str ? err_str : "error unknown");
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goto error;
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}
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// Get the address of the bt_interface_t.
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itf = (bt_interface_t*)dlsym(handle, sym);
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if (!itf) {
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LOG(ERROR) << __func__ << ": failed to load symbol from Bluetooth library "
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<< sym;
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goto error;
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}
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// Success.
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LOG(INFO) << __func__ << " loaded HAL path=" << BLUETOOTH_LIBRARY_NAME
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<< " btinterface=" << itf << " handle=" << handle;
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*interface = itf;
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return 0;
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error:
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*interface = NULL;
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if (handle) dlclose(handle);
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return -EINVAL;
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}
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