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//
// Copyright (C) 2017 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 <getopt.h>
#include <sys/system_properties.h>
#include <iostream>
#include <string>
#include <vector>
#include <android-base/properties.h>
#include <property_info_parser/property_info_parser.h>
using android::base::GetProperty;
using android::properties::PropertyInfoAreaFile;
PropertyInfoAreaFile property_info_file;
void PrintAllProperties(bool print_property_context) {
std::vector<std::pair<std::string, std::string>> properties;
__system_property_foreach(
[](const prop_info* pi, void* cookie) {
__system_property_read_callback(
pi,
[](void* cookie, const char* name, const char* value, unsigned) {
auto properties =
reinterpret_cast<std::vector<std::pair<std::string, std::string>>*>(cookie);
properties->emplace_back(name, value);
},
cookie);
},
&properties);
std::sort(properties.begin(), properties.end());
if (print_property_context) {
for (auto& [name, value] : properties) {
const char* context = nullptr;
property_info_file->GetPropertyInfo(name.c_str(), &context, nullptr);
value = context;
}
}
for (const auto& [name, value] : properties) {
std::cout << "[" << name << "]: [" << value << "]" << std::endl;
}
}
void PrintProperty(const char* name, const char* default_value, bool print_property_context) {
if (print_property_context) {
const char* context = nullptr;
property_info_file->GetPropertyInfo(name, &context, nullptr);
std::cout << context << std::endl;
} else {
std::cout << GetProperty(name, default_value) << std::endl;
}
}
extern "C" int getprop_main(int argc, char** argv) {
bool print_property_context = false;
while (true) {
static const struct option long_options[] = {
{"help", no_argument, nullptr, 'h'},
{nullptr, 0, nullptr, 0},
};
int arg = getopt_long(argc, argv, "Z", long_options, nullptr);
if (arg == -1) {
break;
}
switch (arg) {
case 'h':
std::cout << "usage: getprop [-Z] [NAME [DEFAULT]]\n\n"
"Gets an Android system property, or lists them all.\n"
"Use -Z to return the property context instead of the property value\n"
<< std::endl;
return 0;
case 'Z':
print_property_context = true;
break;
case '?':
return -1;
default:
std::cerr << "getprop: getopt returned invalid result: " << arg << std::endl;
return -1;
}
}
if (print_property_context) {
property_info_file.LoadDefaultPath();
if (!property_info_file) {
std::cerr << "Unable to load property info file" << std::endl;
return -1;
}
}
if (optind >= argc) {
PrintAllProperties(print_property_context);
return 0;
}
if (optind < argc - 2) {
std::cerr << "getprop: Max 2 arguments (see \"getprop --help\")" << std::endl;
return -1;
}
PrintProperty(argv[optind], (optind == argc - 1) ? "" : argv[optind + 1],
print_property_context);
return 0;
}
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