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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 "SlavePTY.h"
28#include "MasterPTY.h"
29#include <Kernel/FileSystem/DevPtsFS.h>
30#include <Kernel/Process.h>
31
32//#define SLAVEPTY_DEBUG
33
34namespace Kernel {
35
36SlavePTY::SlavePTY(MasterPTY& master, unsigned index)
37 : TTY(201, index)
38 , m_master(master)
39 , m_index(index)
40{
41 sprintf(m_tty_name, "/dev/pts/%u", m_index);
42 set_uid(Process::current->uid());
43 set_gid(Process::current->gid());
44 DevPtsFS::register_slave_pty(*this);
45 set_size(80, 25);
46}
47
48SlavePTY::~SlavePTY()
49{
50#ifdef SLAVEPTY_DEBUG
51 dbg() << "~SlavePTY(" << m_index << ")";
52#endif
53 DevPtsFS::unregister_slave_pty(*this);
54}
55
56StringView SlavePTY::tty_name() const
57{
58 return m_tty_name;
59}
60
61void SlavePTY::echo(u8 ch)
62{
63 if (should_echo_input()) {
64 m_master->on_slave_write(&ch, 1);
65 }
66}
67
68void SlavePTY::on_master_write(const u8* buffer, ssize_t size)
69{
70 for (ssize_t i = 0; i < size; ++i)
71 emit(buffer[i]);
72}
73
74ssize_t SlavePTY::on_tty_write(const u8* data, ssize_t size)
75{
76 return m_master->on_slave_write(data, size);
77}
78
79bool SlavePTY::can_write(const FileDescription&) const
80{
81 return m_master->can_write_from_slave();
82}
83
84bool SlavePTY::can_read(const FileDescription& description) const
85{
86 if (m_master->is_closed())
87 return true;
88 return TTY::can_read(description);
89}
90
91ssize_t SlavePTY::read(FileDescription& description, u8* buffer, ssize_t size)
92{
93 if (m_master->is_closed())
94 return 0;
95 return TTY::read(description, buffer, size);
96}
97
98void SlavePTY::close()
99{
100 m_master->notify_slave_closed({});
101}
102
103}