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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <dirent.h>
#include <sys/types.h>
#include <iterator>
#include <memory>
#include <vector>
namespace android {
namespace base {
class AllPids {
class PidIterator {
public:
PidIterator(DIR* dir) : dir_(dir, closedir) { Increment(); }
PidIterator& operator++() {
Increment();
return *this;
}
bool operator==(const PidIterator& other) const { return pid_ == other.pid_; }
bool operator!=(const PidIterator& other) const { return !(*this == other); }
long operator*() const { return pid_; }
// iterator traits
using difference_type = pid_t;
using value_type = pid_t;
using pointer = const pid_t*;
using reference = const pid_t&;
using iterator_category = std::input_iterator_tag;
private:
void Increment();
pid_t pid_ = -1;
std::unique_ptr<DIR, decltype(&closedir)> dir_;
};
public:
PidIterator begin() { return opendir("/proc"); }
PidIterator end() { return nullptr; }
};
} // namespace base
} // namespace android
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