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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
#include "TTY.h"
#include "Process.h"
#include <LibC/errno_numbers.h>
#include <LibC/signal_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
//#define TTY_DEBUG
TTY::TTY(unsigned major, unsigned minor)
: CharacterDevice(major, minor)
{
set_default_termios();
}
TTY::~TTY()
{
}
void TTY::set_default_termios()
{
memset(&m_termios, 0, sizeof(m_termios));
m_termios.c_lflag |= ISIG | ECHO;
static const char default_cc[32] = "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0";
memcpy(m_termios.c_cc, default_cc, sizeof(default_cc));
}
ssize_t TTY::read(Process&, byte* buffer, size_t size)
{
return m_buffer.read(buffer, size);
}
ssize_t TTY::write(Process&, const byte* buffer, size_t size)
{
#ifdef TTY_DEBUG
dbgprintf("TTY::write {%u} ", size);
for (size_t i = 0; i < size; ++i) {
dbgprintf("%b ", buffer[i]);
}
dbgprintf("\n");
#endif
on_tty_write(buffer, size);
return size;
}
bool TTY::can_read(Process&) const
{
return !m_buffer.is_empty();
}
bool TTY::can_write(Process&) const
{
return true;
}
void TTY::emit(byte ch)
{
if (should_generate_signals()) {
if (ch == m_termios.c_cc[VINTR]) {
dbgprintf("%s: VINTR pressed!\n", tty_name().characters());
generate_signal(SIGINT);
return;
}
if (ch == m_termios.c_cc[VQUIT]) {
dbgprintf("%s: VQUIT pressed!\n", tty_name().characters());
generate_signal(SIGQUIT);
return;
}
}
m_buffer.write(&ch, 1);
}
void TTY::generate_signal(int signal)
{
if (!pgid())
return;
dbgprintf("%s: Send signal %d to everyone in pgrp %d\n", tty_name().characters(), signal, pgid());
InterruptDisabler disabler; // FIXME: Iterate over a set of process handles instead?
Process::for_each_in_pgrp(pgid(), [&] (auto& process) {
dbgprintf("%s: Send signal %d to %d\n", tty_name().characters(), signal, process.pid());
process.send_signal(signal, nullptr);
return true;
});
}
void TTY::set_termios(const termios& t)
{
m_termios = t;
dbgprintf("%s set_termios: ECHO=%u, ISIG=%u, ICANON=%u\n",
tty_name().characters(),
should_echo_input(),
should_generate_signals(),
in_canonical_mode()
);
dbgprintf("%s set_termios: ECHOE=%u, ECHOK=%u, ECHONL=%u\n",
tty_name().characters(),
(m_termios.c_lflag & ECHOE) != 0,
(m_termios.c_lflag & ECHOK) != 0,
(m_termios.c_lflag & ECHONL) != 0
);
dbgprintf("%s set_termios: ISTRIP=%u, ICRNL=%u, INLCR=%u, IGNCR=%u\n",
tty_name().characters(),
(m_termios.c_iflag & ISTRIP) != 0,
(m_termios.c_iflag & ICRNL) != 0,
(m_termios.c_iflag & INLCR) != 0,
(m_termios.c_iflag & IGNCR) != 0
);
}
int TTY::ioctl(Process& process, unsigned request, unsigned arg)
{
pid_t pgid;
termios* tp;
winsize* ws;
#if 0
// FIXME: When should we block things?
// How do we make this work together with MasterPTY forwarding to us?
if (process.tty() && process.tty() != this) {
return -ENOTTY;
}
#endif
switch (request) {
case TIOCGPGRP:
return m_pgid;
case TIOCSPGRP:
// FIXME: Validate pgid fully.
pgid = static_cast<pid_t>(arg);
if (pgid < 0)
return -EINVAL;
m_pgid = pgid;
return 0;
case TCGETS:
tp = reinterpret_cast<termios*>(arg);
if (!process.validate_write(tp, sizeof(termios)))
return -EFAULT;
*tp = m_termios;
return 0;
case TCSETS:
case TCSETSF:
case TCSETSW:
tp = reinterpret_cast<termios*>(arg);
if (!process.validate_read(tp, sizeof(termios)))
return -EFAULT;
set_termios(*tp);
return 0;
case TIOCGWINSZ:
ws = reinterpret_cast<winsize*>(arg);
if (!process.validate_write(ws, sizeof(winsize)))
return -EFAULT;
ws->ws_row = m_rows;
ws->ws_col = m_columns;
return 0;
case TIOCSWINSZ:
ws = reinterpret_cast<winsize*>(arg);
if (!process.validate_read(ws, sizeof(winsize)))
return -EFAULT;
if (ws->ws_col == m_columns && ws->ws_row == m_rows)
return 0;
m_rows = ws->ws_row;
m_columns = ws->ws_col;
generate_signal(SIGWINCH);
return 0;
case TIOCSCTTY:
process.set_tty(this);
return 0;
case TIOCNOTTY:
process.set_tty(nullptr);
return 0;
}
ASSERT_NOT_REACHED();
return -EINVAL;
}
void TTY::set_size(unsigned short columns, unsigned short rows)
{
m_rows = rows;
m_columns = columns;
}
void TTY::hang_up()
{
generate_signal(SIGHUP);
}
|
