blob: 66b152a818cfd72c5fe5256eac3bbddda306eaa6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/DoubleBuffer.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/Locking/Mutex.h>
#include <Kernel/UnixTypes.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
class OpenFileDescription;
class FIFO final : public File {
public:
enum class Direction : u8 {
Neither,
Reader,
Writer
};
static KResultOr<NonnullRefPtr<FIFO>> try_create(UserID);
virtual ~FIFO() override;
UserID uid() const { return m_uid; }
KResultOr<NonnullRefPtr<OpenFileDescription>> open_direction(Direction);
KResultOr<NonnullRefPtr<OpenFileDescription>> open_direction_blocking(Direction);
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Woverloaded-virtual"
void attach(Direction);
void detach(Direction);
#pragma GCC diagnostic pop
private:
// ^File
virtual KResultOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
virtual KResultOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
virtual KResult stat(::stat&) const override;
virtual bool can_read(const OpenFileDescription&, size_t) const override;
virtual bool can_write(const OpenFileDescription&, size_t) const override;
virtual String absolute_path(const OpenFileDescription&) const override;
virtual StringView class_name() const override { return "FIFO"; }
virtual bool is_fifo() const override { return true; }
explicit FIFO(UserID, NonnullOwnPtr<DoubleBuffer> buffer);
unsigned m_writers { 0 };
unsigned m_readers { 0 };
NonnullOwnPtr<DoubleBuffer> m_buffer;
UserID m_uid { 0 };
int m_fifo_id { 0 };
WaitQueue m_read_open_queue;
WaitQueue m_write_open_queue;
Mutex m_open_lock;
};
}
|
