libcamera: include/libcamera/internal/process.h Source File

libcamera v0.7.2 Supporting cameras in Linux since 2019

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process.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2019, Google Inc.
4 *
5 * Process object
6 */
7
8#pragma once
9
10#include <string>
11
12#include <libcamera/base/class.h>
13#include <libcamera/base/signal.h>
14#include <libcamera/base/span.h>
15#include <libcamera/base/unique_fd.h>
16
17namespace libcamera {
18
19class EventNotifier;
20
21 class Process final
22{
23public:
24 enum ExitStatus {
25 NotExited,
26 NormalExit,
27 SignalExit,
28 };
29
30 Process();
31 ~Process();
32
33 int start(const std::string &path,
34 Span<const std::string> args = {},
35 Span<const int> fds = {});
36
37 ExitStatus exitStatus() const { return exitStatus_; }
38 int exitCode() const { return exitCode_; }
39
40 void kill();
41
42 Signal<enum ExitStatus, int> finished;
43
44private:
45 LIBCAMERA_DISABLE_COPY_AND_MOVE(Process)
46
47 void onPidfdNotify();
48
49 pid_t pid_;
50 enum ExitStatus exitStatus_;
51 int exitCode_;
52
53 UniqueFD pidfd_;
54 std::unique_ptr<EventNotifier> pidfdNotify_;
55};
56
57} /* namespace libcamera */
class.h
Utilities to help constructing class interfaces.
LIBCAMERA_DISABLE_COPY_AND_MOVE
#define LIBCAMERA_DISABLE_COPY_AND_MOVE(klass)
Disable copy and move construction and assignment of the klass.
Definition class.h:29
libcamera::EventNotifier
Notify of activity on a file descriptor.
Definition event_notifier.h:20
libcamera::Process
Process object.
Definition process.h:22
libcamera::Process::kill
void kill()
Kill the process.
Definition process.cpp:281
libcamera::Process::start
int start(const std::string &path, Span< const std::string > args={}, Span< const int > fds={})
Fork and exec a process, and close fds.
Definition process.cpp:141
libcamera::Process::ExitStatus
ExitStatus
Exit status of process.
Definition process.h:24
libcamera::Process::SignalExit
@ SignalExit
Definition process.h:27
libcamera::Process::NotExited
@ NotExited
Definition process.h:25
libcamera::Process::NormalExit
@ NormalExit
Definition process.h:26
libcamera::Process::finished
Signal< enum ExitStatus, int > finished
Definition process.h:42
libcamera::Process::exitCode
int exitCode() const
Retrieve the exit code of the process.
Definition process.h:38
libcamera::Process::exitStatus
ExitStatus exitStatus() const
Retrieve the exit status of the process.
Definition process.h:37
libcamera::Signal
Generic signal and slot communication mechanism.
Definition signal.h:39
libcamera::UniqueFD
unique_ptr-like wrapper for a file descriptor
Definition unique_fd.h:17
libcamera
Top-level libcamera namespace.
Definition backtrace.h:17
signal.h
Signal & slot implementation.
unique_fd.h
File descriptor wrapper that owns a file descriptor.