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#ifndef ANDROID_DVR_PERFORMANCED_TASK_H_
#define ANDROID_DVR_PERFORMANCED_TASK_H_
#include <sys/types.h>
#include <array>
#include <cstdio>
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include <android-base/unique_fd.h>
#include "unique_file.h"
namespace android {
namespace dvr {
// Task provides access to task-related information from the procfs
// pseudo-filesystem.
class Task {
public:
explicit Task(pid_t task_id);
bool IsValid() const { return task_fd_.get() >= 0; }
explicit operator bool() const { return IsValid(); }
pid_t task_id() const { return task_id_; }
std::string name() const { return name_; }
pid_t thread_group_id() const { return thread_group_id_; }
pid_t parent_process_id() const { return parent_process_id_; }
size_t thread_count() const { return thread_count_; }
uint32_t cpus_allowed_mask() const { return cpus_allowed_mask_; }
const std::string& cpus_allowed_list() const { return cpus_allowed_list_; }
const std::array<int, 4>& user_id() const { return user_id_; }
const std::array<int, 4>& group_id() const { return group_id_; }
// Indices into user and group id arrays.
enum {
kUidReal = 0,
kUidEffective,
kUidSavedSet,
kUidFilesystem,
};
std::string GetCpuSetPath() const;
private:
pid_t task_id_;
base::unique_fd task_fd_;
// Fields read from /proc/<task_id_>/status.
std::string name_;
pid_t thread_group_id_;
pid_t parent_process_id_;
std::array<int, 4> user_id_;
std::array<int, 4> group_id_;
size_t thread_count_;
uint32_t cpus_allowed_mask_;
std::string cpus_allowed_list_;
// Opens the file /proc/<task_id_>/|name| and returns the open file
// descriptor.
base::unique_fd OpenTaskFile(const std::string& name) const;
// Similar to OpenTaskFile() but returns a file pointer.
UniqueFile OpenTaskFilePointer(const std::string& name) const;
// Reads the field named |field| from /proc/<task_id_>/status.
std::string GetStatusField(const std::string& field) const;
// Reads a subset of the fields in /proc/<task_id_>/status.
void ReadStatusFields();
Task(const Task&) = delete;
void operator=(const Task&) = delete;
};
} // namespace dvr
} // namespace android
#endif // ANDROID_DVR_PERFORMANCED_TASK_H_
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