process.cpp
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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>
*/
#include <core/posix/process.h>
#include <core/posix/signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <iostream>
namespace core
{
namespace posix
{
struct Process::Private
{
pid_t pid;
};
Process Process::invalid()
{
static const pid_t invalid_pid = 0;
Process p(invalid_pid);
p.d->pid = -1;
return p;
}
Process::Process(pid_t pid)
: Signalable(pid),
d(new Private{pid})
{
if (pid < 0)
throw std::runtime_error("Cannot construct instance for invalid pid.");
}
Process::~Process() noexcept
{
}
pid_t Process::pid() const
{
return d->pid;
}
ProcessGroup Process::process_group_or_throw() const
{
pid_t pgid = ::getpgid(pid());
if (pgid == -1)
throw std::system_error(errno, std::system_category());
return ProcessGroup(pgid);
}
ProcessGroup Process::process_group(std::error_code& se) const noexcept(true)
{
pid_t pgid = ::getpgid(pid());
if (pgid == -1)
{
se = std::error_code(errno, std::system_category());
}
return ProcessGroup(pgid);
}
}
}
core::posix::ProcessGroup
The ProcessGroup class models a signalable group of process.
Definition process_group.h:44
core::posix::Process
The Process class models a process and possible operations on it.
Definition process.h:45
core::posix::Process::Process
Process(pid_t pid)
Creates a process instance wrapping an existing process.
Definition process.cpp:47
core::posix::Process::process_group
virtual ProcessGroup process_group(std::error_code &se) const noexcept(true)
Queries the id of the process group this process belongs to.
Definition process.cpp:74
core::posix::Process::process_group_or_throw
virtual ProcessGroup process_group_or_throw() const
Queries the id of the process group this process belongs to.
Definition process.cpp:64
core::posix::Process::invalid
static Process invalid()
Returns an invalid instance for testing purposes.
Definition process.cpp:38
core::posix::Process::~Process
virtual ~Process() noexcept
Frees resources associated with the process.
Definition process.cpp:55
core::posix::Process::pid
virtual pid_t pid() const
Query the pid of the process.
Definition process.cpp:59
core::posix::Signalable
The Signalable class abstracts the ability of an entity to be delivered a posix signal.
Definition signalable.h:36
core
Definition child_process.h:32
process.h
signal.h
core::posix::Process::Private
Definition process.cpp:34
core::posix::Process::Private::pid
pid_t pid
Definition process.cpp:35