1 /*
2 * Copyright 2019 The Android Open Source Project
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 #include "os/system_properties.h"
18
19 #include <cutils/properties.h>
20
21 #include <array>
22
23 #include "os/log.h"
24
25 namespace bluetooth {
26 namespace os {
27
GetSystemProperty(const std::string & property)28 std::optional<std::string> GetSystemProperty(const std::string& property) {
29 std::array<char, PROPERTY_VALUE_MAX> value_array{0};
30 auto value_len = property_get(property.c_str(), value_array.data(), nullptr);
31 if (value_len <= 0) {
32 return std::nullopt;
33 }
34 return std::string(value_array.data(), value_len);
35 }
36
SetSystemProperty(const std::string & property,const std::string & value)37 bool SetSystemProperty(const std::string& property, const std::string& value) {
38 if (value.size() >= PROPERTY_VALUE_MAX) {
39 LOG_ERROR("Property value's maximum size is %d, but %zu chars were given", PROPERTY_VALUE_MAX - 1, value.size());
40 return false;
41 }
42 auto ret = property_set(property.c_str(), value.c_str());
43 if (ret != 0) {
44 LOG_ERROR("Set property %s failed with error code %d", property.c_str(), ret);
45 return false;
46 }
47 return true;
48 }
49
50 } // namespace os
51 } // namespace bluetooth