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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#include <Kernel/ProcessTracer.h>
28
29namespace Kernel {
30
31ProcessTracer::ProcessTracer(pid_t pid)
32 : m_pid(pid)
33{
34}
35
36ProcessTracer::~ProcessTracer()
37{
38}
39
40void ProcessTracer::did_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3, u32 result)
41{
42 CallData data = { function, arg1, arg2, arg3, result };
43 m_calls.enqueue(data);
44}
45
46int ProcessTracer::read(FileDescription&, u8* buffer, int buffer_size)
47{
48 if (m_calls.is_empty())
49 return 0;
50 auto data = m_calls.dequeue();
51 // FIXME: This should not be an assertion.
52 ASSERT(buffer_size == sizeof(data));
53 memcpy(buffer, &data, sizeof(data));
54 return sizeof(data);
55}
56
57String ProcessTracer::absolute_path(const FileDescription&) const
58{
59 return String::format("tracer:%d", m_pid);
60}
61
62}