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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#ifdef __serenity__
28
29#include <AK/SharedBuffer.h>
30#include <AK/kmalloc.h>
31#include <Kernel/Syscall.h>
32#include <stdio.h>
33#include <unistd.h>
34
35namespace AK {
36
37RefPtr<SharedBuffer> SharedBuffer::create_with_size(int size)
38{
39 void* data;
40 int shared_buffer_id = create_shared_buffer(size, &data);
41 if (shared_buffer_id < 0) {
42 perror("create_shared_buffer");
43 return nullptr;
44 }
45 return adopt(*new SharedBuffer(shared_buffer_id, size, data));
46}
47
48bool SharedBuffer::share_with(pid_t peer)
49{
50 int ret = share_buffer_with(shared_buffer_id(), peer);
51 if (ret < 0) {
52 perror("share_buffer_with");
53 return false;
54 }
55 return true;
56}
57
58bool SharedBuffer::share_globally()
59{
60 int ret = share_buffer_globally(shared_buffer_id());
61 if (ret < 0) {
62 perror("share_buffer_globally");
63 return false;
64 }
65 return true;
66}
67
68RefPtr<SharedBuffer> SharedBuffer::create_from_shared_buffer_id(int shared_buffer_id)
69{
70 void* data = get_shared_buffer(shared_buffer_id);
71 if (data == (void*)-1) {
72 perror("get_shared_buffer");
73 return nullptr;
74 }
75 int size = get_shared_buffer_size(shared_buffer_id);
76 if (size < 0) {
77 perror("get_shared_buffer_size");
78 return nullptr;
79 }
80 return adopt(*new SharedBuffer(shared_buffer_id, size, data));
81}
82
83SharedBuffer::SharedBuffer(int shared_buffer_id, int size, void* data)
84 : m_shared_buffer_id(shared_buffer_id)
85 , m_size(size)
86 , m_data(data)
87{
88}
89
90SharedBuffer::~SharedBuffer()
91{
92 if (m_shared_buffer_id >= 0) {
93 int rc = release_shared_buffer(m_shared_buffer_id);
94 if (rc < 0) {
95 perror("release_shared_buffer");
96 }
97 }
98}
99
100void SharedBuffer::seal()
101{
102 int rc = seal_shared_buffer(m_shared_buffer_id);
103 if (rc < 0) {
104 perror("seal_shared_buffer");
105 ASSERT_NOT_REACHED();
106 }
107}
108
109void SharedBuffer::set_volatile()
110{
111 u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, true);
112 ASSERT(rc == 0);
113}
114
115bool SharedBuffer::set_nonvolatile()
116{
117 u32 rc = syscall(SC_set_shared_buffer_volatile, m_shared_buffer_id, false);
118 if (rc == 0)
119 return true;
120 if (rc == 1)
121 return false;
122 ASSERT_NOT_REACHED();
123}
124
125}
126
127#endif