process-cpp: /build/process-cpp/src/process-cpp-3.0.1/src/core/posix/linux/proc/process/oom_score_adj.cpp Source File

process-cpp 3.0.0 A simple convenience library for handling processes in C++11.

oom_score_adj.cpp
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1 /*
2 * Copyright © 2013 Canonical Ltd.
3 *
4 * This program is free software: you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License version 3,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authored by: Thomas Voß <thomas.voss@canonical.com>
17 */
18
19 #include <core/posix/linux/proc/process/oom_score_adj.h>
20
21 #include <core/posix/process.h>
22
23 #include <fstream>
24 #include <sstream>
25 #include <stdexcept>
26
27 #include <linux/oom.h>
28
29 namespace core
30 {
31 namespace posix
32 {
33 namespace linux
34 {
35 namespace proc
36 {
37 namespace process
38 {
39
40 int OomScoreAdj::min_value()
41 {
42 return OOM_SCORE_ADJ_MIN;
43 }
44
45 int OomScoreAdj::max_value()
46 {
47 return OOM_SCORE_ADJ_MAX;
48 }
49
50 const posix::Process& operator>>(const posix::Process& process, OomScoreAdj& score_adj)
51 {
52 std::stringstream ss; ss << "/proc/" << process.pid() << "/oom_score_adj";
53 std::ifstream in(ss.str());
54
55 in >> score_adj.value;
56
57 return process;
58 }
59
60 const posix::Process& operator<<(const posix::Process& process, const OomScoreAdj& score_adj)
61 {
62 if (!score_adj.is_valid())
63 throw std::logic_error("Value for adjusting the oom score is invalid.");
64
65 std::stringstream ss; ss << "/proc/" << process.pid() << "/oom_score_adj";
66 std::ofstream out(ss.str());
67
68 out << score_adj.value;
69
70 return process;
71 }
72 }
73 }
74 }
75 }
76 }
core::posix::linux::proc::process::OomScoreAdj::min_value
static int min_value()
Returns the minimum valid value.
Definition: oom_score_adj.cpp:40
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::posix::linux::proc::process::OomScoreAdj
Definition: oom_score_adj.h:82
oom_score_adj.h
core::posix::linux::proc::process::OomScoreAdj::max_value
static int max_value()
Returns the maximum valid value.
Definition: oom_score_adj.cpp:45
process.h
core::posix::linux::proc::process::OomScoreAdj::is_valid
bool is_valid() const
is_valid checks whether the contained value is within the predefined bounds.
Definition: oom_score_adj.h:99
core
Definition: child_process.h:32
core::posix::Process::pid
virtual pid_t pid() const
Query the pid of the process.
Definition: process.cpp:59
core::posix::linux::proc::process::OomScoreAdj::value
int value
Current value.
Definition: oom_score_adj.h:107
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::Process
The Process class models a process and possible operations on it.
Definition: process.h:45