64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
// Copyright (C) 2015 The Android Open Source Project
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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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#include <dirent.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include <android-base/stringprintf.h>
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#include "tasklist.h"
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template <typename Func>
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static bool ScanPidsInDir(const std::string& name, Func f) {
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std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(name.c_str()), closedir);
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if (!dir) {
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return false;
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}
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dirent* entry;
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while ((entry = readdir(dir.get())) != nullptr) {
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if (isdigit(entry->d_name[0])) {
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pid_t pid = atoi(entry->d_name);
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f(pid);
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}
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}
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return true;
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}
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bool TaskList::Scan(std::map<pid_t, std::vector<pid_t>>& tgid_map) {
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tgid_map.clear();
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return ScanPidsInDir("/proc", [&tgid_map](pid_t tgid) {
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std::vector<pid_t> pid_list;
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if (ScanPid(tgid, pid_list)) {
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tgid_map.insert({tgid, pid_list});
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}
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});
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}
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bool TaskList::ScanPid(pid_t tgid, std::vector<pid_t>& pid_list) {
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std::string filename = android::base::StringPrintf("/proc/%d/task", tgid);
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return ScanPidsInDir(filename, [&pid_list](pid_t pid) { pid_list.push_back(pid); });
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}
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