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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/CircularQueue.h>
30#include <Kernel/FileSystem/File.h>
31#include <Kernel/UnixTypes.h>
32
33namespace Kernel {
34
35class ProcessTracer : public File {
36public:
37 static NonnullRefPtr<ProcessTracer> create(pid_t pid) { return adopt(*new ProcessTracer(pid)); }
38 virtual ~ProcessTracer() override;
39
40 bool is_dead() const { return m_dead; }
41 void set_dead() { m_dead = true; }
42
43 virtual bool can_read(const FileDescription&) const override { return !m_calls.is_empty() || m_dead; }
44 virtual int read(FileDescription&, u8*, int) override;
45
46 virtual bool can_write(const FileDescription&) const override { return true; }
47 virtual int write(FileDescription&, const u8*, int) override { return -EIO; }
48
49 virtual String absolute_path(const FileDescription&) const override;
50
51 void did_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3, u32 result);
52 pid_t pid() const { return m_pid; }
53
54private:
55 virtual const char* class_name() const override { return "ProcessTracer"; }
56 explicit ProcessTracer(pid_t);
57
58 struct CallData {
59 u32 function;
60 u32 arg1;
61 u32 arg2;
62 u32 arg3;
63 u32 result;
64 };
65
66 pid_t m_pid;
67 bool m_dead { false };
68 CircularQueue<CallData, 200> m_calls;
69};
70
71}