process-cpp 3.0.0
A simple convenience library for handling processes in C++11.
fork_and_run.cpp
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1/*
2 * Copyright © 2012-2013 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
20
21#include <core/posix/exit.h>
22#include <core/posix/fork.h>
23#include <core/posix/wait.h>
24
28{
29 return static_cast<core::testing::ForkAndRunResult>(
30 static_cast<unsigned int> (lhs) | static_cast<unsigned int>(rhs));
31}
32
36{
37 return static_cast<core::testing::ForkAndRunResult>(
38 static_cast<unsigned int> (lhs) & static_cast<unsigned int>(rhs));
39}
40
42 const std::function<core::posix::exit::Status()>& service,
43 const std::function<core::posix::exit::Status()>& client)
44{
46
47 auto service_process = core::posix::fork(service, core::posix::StandardStream::empty);
48 auto client_process = core::posix::fork(client, core::posix::StandardStream::empty);
49
50 auto client_result = client_process.wait_for(core::posix::wait::Flags::untraced);
51
52 switch (client_result.status)
53 {
55 if (client_result.detail.if_exited.status == core::posix::exit::Status::failure)
57 break;
58 default:
60 break;
61 }
62
63 service_process.send_signal_or_throw(core::posix::Signal::sig_term);
64 auto service_result = service_process.wait_for(core::posix::wait::Flags::untraced);
65
66 switch (service_result.status)
67 {
69 if (service_result.detail.if_exited.status == core::posix::exit::Status::failure)
71 break;
72 default:
74 break;
75 }
76
77 return result;
78}
Status
The Status enum wrap's the posix exit status.
Definition: exit.h:34
@ untraced
Also wait for state changes in untraced children.
CORE_POSIX_DLL_PUBLIC ChildProcess fork(const std::function< posix::exit::Status()> &main, const StandardStream &flags)
fork forks a new process and executes the provided main function in the newly forked process.
Definition: fork.cpp:57
CORE_POSIX_DLL_PUBLIC ForkAndRunResult operator&(ForkAndRunResult lhs, ForkAndRunResult rhs)
CORE_POSIX_DLL_PUBLIC ForkAndRunResult operator|(ForkAndRunResult lhs, ForkAndRunResult rhs)
ForkAndRunResult
The ForkAndRunResult enum models the different failure modes of fork_and_run.
Definition: fork_and_run.h:35
@ client_failed
The client failed.
@ empty
Special value indicating no bit being set.
@ service_failed
The service failed.
CORE_POSIX_DLL_PUBLIC ForkAndRunResult fork_and_run(const std::function< core::posix::exit::Status()> &service, const std::function< core::posix::exit::Status()> &client)
Forks two processes for both the service and the client.
@ exited
The process exited normally.