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 
34 {
35  pid_t pid;
36 };
37 
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 
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 
56 {
57 }
58 
59 pid_t Process::pid() const
60 {
61  return d->pid;
62 }
63 
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 }
static Process invalid()
Returns an invalid instance for testing purposes.
Definition: process.cpp:38
The Process class models a process and possible operations on it.
Definition: process.h:44
The Signalable class abstracts the ability of an entity to be delivered a posix signal.
Definition: signalable.h:35
virtual ProcessGroup process_group_or_throw() const
Queries the id of the process group this process belongs to.
Definition: process.cpp:64
virtual ~Process() noexcept
Frees resources associated with the process.
Definition: process.cpp:55
Process(pid_t pid)
Creates a process instance wrapping an existing process.
Definition: process.cpp:47
virtual pid_t pid() const
Query the pid of the process.
Definition: process.cpp:59
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
The ProcessGroup class models a signalable group of process.
Definition: process_group.h:43