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

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

process.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/process.h>
20
21 #include <core/posix/signal.h>
22
23 #include <sys/types.h>
24 #include <unistd.h>
25
26 #include <iostream>
27
28 namespace core
29 {
30 namespace posix
31 {
32
33 struct Process::Private
34 {
35 pid_t pid;
36 };
37
38 Process Process::invalid()
39 {
40 static const pid_t invalid_pid = 0;
41 Process p(invalid_pid);
42 p.d->pid = -1;
43
44 return p;
45 }
46
47 Process::Process(pid_t pid)
48 : Signalable(pid),
49 d(new Private{pid})
50 {
51 if (pid < 0)
52 throw std::runtime_error("Cannot construct instance for invalid pid.");
53 }
54
55 Process::~Process() noexcept
56 {
57 }
58
59 pid_t Process::pid() const
60 {
61 return d->pid;
62 }
63
64 ProcessGroup Process::process_group_or_throw() const
65 {
66 pid_t pgid = ::getpgid(pid());
67
68 if (pgid == -1)
69 throw std::system_error(errno, std::system_category());
70
71 return ProcessGroup(pgid);
72 }
73
74 ProcessGroup Process::process_group(std::error_code& se) const noexcept(true)
75 {
76 pid_t pgid = ::getpgid(pid());
77
78 if (pgid == -1)
79 {
80 se = std::error_code(errno, std::system_category());
81 }
82
83 return ProcessGroup(pgid);
84 }
85 }
86 }
core::posix::Process::Private
Definition: process.cpp:34
core::posix::ProcessGroup
The ProcessGroup class models a signalable group of process.
Definition: process_group.h:44
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::Signalable
The Signalable class abstracts the ability of an entity to be delivered a posix signal.
Definition: signalable.h:36
process.h
core::posix::Process::Private::pid
pid_t pid
Definition: process.cpp:35
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
signal.h
core::posix::Process::~Process
virtual ~Process() noexcept
Frees resources associated with the process.
Definition: process.cpp:55
core::posix::Process::invalid
static Process invalid()
Returns an invalid instance for testing purposes.
Definition: process.cpp:38
core::posix::Process::Process
Process(pid_t pid)
Creates a process instance wrapping an existing process.
Definition: process.cpp:47
core::posix::Process
The Process class models a process and possible operations on it.
Definition: process.h:45