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/*
* Copyright (C) 2018 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 <procpartition/procpartition.h>
#include <android-base/file.h>
namespace android {
namespace procpartition {
std::ostream& operator<<(std::ostream& os, Partition p) {
switch (p) {
case Partition::SYSTEM: return os << "system";
case Partition::VENDOR: return os << "vendor";
case Partition::ODM: return os << "odm";
case Partition::UNKNOWN: // fallthrough
default:
return os << "(unknown)";
}
}
std::string getExe(pid_t pid) {
std::string exe;
std::string real;
if (!android::base::Readlink("/proc/" + std::to_string(pid) + "/exe", &exe)) {
return "";
}
if (!android::base::Realpath(exe, &real)) {
return "";
}
return real;
}
std::string getCmdline(pid_t pid) {
std::string content;
if (!android::base::ReadFileToString("/proc/" + std::to_string(pid) + "/cmdline", &content,
false /* follow symlinks */)) {
return "";
}
return std::string{content.c_str()};
}
Partition parsePartition(const std::string& s) {
if (s == "system") {
return Partition::SYSTEM;
}
if (s == "vendor") {
return Partition::VENDOR;
}
if (s == "odm") {
return Partition::ODM;
}
return Partition::UNKNOWN;
}
Partition getPartitionFromRealpath(const std::string& path) {
if (path == "/system/bin/app_process64" ||
path == "/system/bin/app_process32") {
return Partition::UNKNOWN; // cannot determine
}
size_t backslash = path.find_first_of('/', 1);
std::string partition = (backslash != std::string::npos) ? path.substr(1, backslash - 1) : path;
return parsePartition(partition);
}
Partition getPartitionFromCmdline(pid_t pid) {
const auto& cmdline = getCmdline(pid);
if (cmdline == "system_server") {
return Partition::SYSTEM;
}
if (cmdline.empty() || cmdline.front() != '/') {
return Partition::UNKNOWN;
}
return getPartitionFromRealpath(cmdline);
}
Partition getPartitionFromExe(pid_t pid) {
const auto& real = getExe(pid);
if (real.empty() || real.front() != '/') {
return Partition::UNKNOWN;
}
return getPartitionFromRealpath(real);
}
Partition getPartition(pid_t pid) {
Partition partition = getPartitionFromExe(pid);
if (partition == Partition::UNKNOWN) {
partition = getPartitionFromCmdline(pid);
}
return partition;
}
} // namespace procpartition
} // namespace android
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