process-cpp 3.0.0
A simple convenience library for handling processes in C++11.
child_process.h
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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#ifndef CORE_POSIX_CHILD_PROCESS_H_
20#define CORE_POSIX_CHILD_PROCESS_H_
21
22#include <core/posix/process.h>
25
26#include <core/signal.h>
27
28#include <iosfwd>
29#include <functional>
30
31namespace core
32{
33namespace posix
34{
44{
45public:
57 {
58 public:
64 static std::unique_ptr<DeathObserver> create_once_with_signal_trap(
65 std::shared_ptr<SignalTrap> trap);
66
67 DeathObserver(const DeathObserver&) = delete;
68 virtual ~DeathObserver() = default;
69
71 bool operator==(const DeathObserver&) const = delete;
72
78 virtual bool add(const ChildProcess& child) = 0;
79
85 virtual bool has(const ChildProcess& child) const = 0;
86
90 virtual const core::Signal<ChildProcess>& child_died() const = 0;
91
95 virtual void on_sig_child() = 0;
96
97 protected:
98 DeathObserver() = default;
99 };
100
105 static ChildProcess invalid();
106
108
115 wait::Result wait_for(const wait::Flags& flags);
116
120 std::istream& cerr();
121
125 std::ostream& cin();
126
130 std::istream& cout();
131
132private:
133 friend ChildProcess fork(const std::function<posix::exit::Status()>&, const StandardStream&);
134 friend ChildProcess vfork(const std::function<posix::exit::Status()>&, const StandardStream&);
135
136 class CORE_POSIX_DLL_LOCAL Pipe
137 {
138 public:
139 static Pipe invalid();
140
141 Pipe();
142 Pipe(const Pipe& rhs);
143 ~Pipe();
144
145 Pipe& operator=(const Pipe& rhs);
146
147 int read_fd() const;
148 void close_read_fd();
149
150 int write_fd() const;
151 void close_write_fd();
152
153 private:
154 Pipe(int fds[2]);
155 int fds[2];
156 };
157
159 const Pipe& stdin,
160 const Pipe& stdout,
161 const Pipe& stderr);
162
163 struct CORE_POSIX_DLL_LOCAL Private;
164 std::shared_ptr<Private> d;
165};
166}
167}
168
169#endif // CORE_POSIX_CHILD_PROCESS_H_
The DeathObserver class observes child process' states and emits a signal when a monitored child has ...
virtual bool add(const ChildProcess &child)=0
add adds the specified child to the list of observed child processes.
DeathObserver & operator=(const DeathObserver &)=delete
virtual bool has(const ChildProcess &child) const =0
has checks whether the specified child is observed.
virtual void on_sig_child()=0
Checks and reaps all child processes registered with the observer instance.
bool operator==(const DeathObserver &) const =delete
DeathObserver(const DeathObserver &)=delete
virtual const core::Signal< ChildProcess > & child_died() const =0
child_died is emitted whenever an observed child ceases to exist.
The Process class models a child process of this process.
The Process class models a process and possible operations on it.
Definition process.h:45
Status
The Status enum wrap's the posix exit status.
Definition exit.h:34
Flags
Flags enumerates different behavior when waiting for a child process to change state.
Definition wait.h:43
CORE_POSIX_DLL_PUBLIC ChildProcess vfork(const std::function< posix::exit::Status()> &main, const StandardStream &flags)
fork vforks a new process and executes the provided main function in the newly forked process.
Definition fork.cpp:122
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
StandardStream
The StandardStream enum wraps the POSIX standard streams.
The Result struct encapsulates the result of waiting for a process state change.
Definition wait.h:55
#define CORE_POSIX_DLL_PUBLIC
Definition visibility.h:26
#define CORE_POSIX_DLL_LOCAL
Definition visibility.h:27