libcamera v0.0.0+3240-f2a18172-dirty (2022-05-13T12:20:20+00:00)
Supporting cameras in Linux since 2019
ipc_unixsocket.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2019, Google Inc.
4 *
5 * ipc_unixsocket.h - IPC mechanism based on Unix sockets
6 */
7
8#ifndef __LIBCAMERA_INTERNAL_IPC_UNIXSOCKET_H__
9#define __LIBCAMERA_INTERNAL_IPC_UNIXSOCKET_H__
10
11#include <stdint.h>
12#include <sys/types.h>
13#include <vector>
14
16
17namespace libcamera {
18
19class EventNotifier;
20
22{
23public:
24 struct Payload {
25 std::vector<uint8_t> data;
26 std::vector<int32_t> fds;
27 };
28
31
32 int create();
33 int bind(int fd);
34 void close();
35 bool isBound() const;
36
37 int send(const Payload &payload);
38 int receive(Payload *payload);
39
41
42private:
43 struct Header {
44 uint32_t data;
45 uint8_t fds;
46 };
47
48 int sendData(const void *buffer, size_t length, const int32_t *fds, unsigned int num);
49 int recvData(void *buffer, size_t length, int32_t *fds, unsigned int num);
50
51 void dataNotifier();
52
53 int fd_;
54 bool headerReceived_;
55 struct Header header_;
56 EventNotifier *notifier_;
57};
58
59} /* namespace libcamera */
60
61#endif /* __LIBCAMERA_INTERNAL_IPC_UNIXSOCKET_H__ */
Notify of activity on a file descriptor.
Definition: event_notifier.h:20
IPC mechanism based on Unix sockets.
Definition: ipc_unixsocket.h:22
int receive(Payload *payload)
Receive a message payload.
Definition: ipc_unixsocket.cpp:213
int send(const Payload &payload)
Send a message payload.
Definition: ipc_unixsocket.cpp:171
bool isBound() const
Check if the IPC channel is bound.
Definition: ipc_unixsocket.cpp:156
int bind(int fd)
Bind to an existing IPC channel.
Definition: ipc_unixsocket.cpp:121
void close()
Close the IPC channel.
Definition: ipc_unixsocket.cpp:138
int create()
Create an new IPC channel.
Definition: ipc_unixsocket.cpp:91
Signal readyRead
A Signal emitted when a message is ready to be read.
Definition: ipc_unixsocket.h:40
Generic signal and slot communication mechanism.
Definition: signal.h:39
Top-level libcamera namespace.
Definition: backtrace.h:17
Signal & slot implementation.
Container for an IPC payload.
Definition: ipc_unixsocket.h:24
std::vector< int32_t > fds
Array of file descriptors to cross IPC boundary.
Definition: ipc_unixsocket.h:26
std::vector< uint8_t > data
Array of bytes to cross IPC boundary.
Definition: ipc_unixsocket.h:25