oom_adj.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/linux/proc/process/oom_adj.h>
#include <core/posix/process.h>
#include <fstream>
#include <sstream>
#include <stdexcept>
#include <linux/oom.h>
namespace core
{
namespace posix
{
namespace linux
{
namespace proc
{
namespace process
{
int OomAdj::disable_value()
{
return OOM_DISABLE;
}
int OomAdj::min_value()
{
return OOM_ADJUST_MIN;
}
int OomAdj::max_value()
{
return OOM_ADJUST_MAX;
}
const posix::Process& operator>>(const posix::Process& process, OomAdj& adj)
{
std::stringstream ss; ss << "/proc/" << process.pid() << "/oom_adj";
std::ifstream in(ss.str());
in >> adj.value;
return process;
}
const posix::Process& operator<<(const posix::Process& process, const OomAdj& adj)
{
if (!adj.is_valid())
throw std::logic_error("Value for adjusting the oom score is invalid.");
std::stringstream ss; ss << "/proc/" << process.pid() << "/oom_adj";
std::ofstream out(ss.str());
out << adj.value;
return process;
}
}
}
}
}
}
core::posix::Process
The Process class models a process and possible operations on it.
Definition process.h:45
core::posix::Process::pid
virtual pid_t pid() const
Query the pid of the process.
Definition process.cpp:59
core::posix::linux::proc::process::operator>>
CORE_POSIX_DLL_PUBLIC const posix::Process & operator>>(const posix::Process &process, OomAdj &adj)
Read the OomAdj value for a process instance.
Definition oom_adj.cpp:55
core::posix::linux::proc::process::operator<<
CORE_POSIX_DLL_PUBLIC const posix::Process & operator<<(const posix::Process &process, const OomAdj &adj)
Write the OomAdj value for a process instance.
Definition oom_adj.cpp:65
core
Definition child_process.h:32
oom_adj.h
process.h
core::posix::linux::proc::process::OomAdj
Definition oom_adj.h:51
core::posix::linux::proc::process::OomAdj::is_valid
bool is_valid() const
is_valid checks whether the contained value is within the predefined bounds.
Definition oom_adj.h:74
core::posix::linux::proc::process::OomAdj::max_value
static int max_value()
Returns the maximum valid value.
Definition oom_adj.cpp:50
core::posix::linux::proc::process::OomAdj::disable_value
static int disable_value()
Returns the value that makes a process "invisible" to the oom killer.
Definition oom_adj.cpp:40
core::posix::linux::proc::process::OomAdj::value
int value
Current value.
Definition oom_adj.h:82
core::posix::linux::proc::process::OomAdj::min_value
static int min_value()
Returns the minimum valid value.
Definition oom_adj.cpp:45