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/*
* Copyright © 2013 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Thomas Voß <thomas.voss@canonical.com>
*/
#ifndef CORE_POSIX_PROCESS_H_
#define CORE_POSIX_PROCESS_H_
#include <core/posix/process_group.h>
#include <core/posix/signalable.h>
#include <core/posix/this_process.h>
#include <core/posix/visibility.h>
#include <core/posix/wait.h>
#include <memory>
#include <system_error>
namespace core
{
namespace posix
{
enum class Signal;
class Self;
class WaitFlags;
/**
* @brief The Process class models a process and possible operations on it.
*
* The process class is implicitly shared.
*/
class CORE_POSIX_DLL_PUBLIC Process : public Signalable
{
public:
/**
* @brief Creates a process instance wrapping an existing process.
* @throw Throw std::system_error if pid is invalid, i.e., pid < 0.
* @param pid The process identifier of the existing process.
*/
explicit Process(pid_t pid);
/**
* @brief Returns an invalid instance for testing purposes.
* @return An invalid instance.
*/
static Process invalid();
/**
* @brief Frees resources associated with the process.
*/
virtual ~Process() noexcept;
/**
* @brief Query the pid of the process.
* @return The pid of the process.
*/
virtual pid_t pid() const;
/**
* @brief Queries the id of the process group this process belongs to.
* @throw std::system_error in case of errors.
* @return The id of the process group this process belongs to.
*/
virtual ProcessGroup process_group_or_throw() const;
/**
* @brief Queries the id of the process group this process belongs to.
*
* @return A tuple with the first element being the id of the process group
* this process belongs to and the second element a boolean flag indicating
* an error if true.
*/
virtual ProcessGroup process_group(std::error_code& se) const noexcept(true);
private:
struct CORE_POSIX_DLL_LOCAL Private;
std::shared_ptr<Private> d;
};
}
}
#endif // CORE_POSIX_PROCESS_H_
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