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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
|
//===-- Terminal.cpp ------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Terminal.h"
#include "lldb/Host/Config.h"
#include "lldb/Host/PosixApi.h"
#include "llvm/ADT/STLExtras.h"
#include <csignal>
#include <fcntl.h>
#if LLDB_ENABLE_TERMIOS
#include <termios.h>
#endif
using namespace lldb_private;
struct Terminal::Data {
#if LLDB_ENABLE_TERMIOS
struct termios m_termios; ///< Cached terminal state information.
#endif
};
bool Terminal::IsATerminal() const { return m_fd >= 0 && ::isatty(m_fd); }
#if !LLDB_ENABLE_TERMIOS
static llvm::Error termiosMissingError() {
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"termios support missing in LLDB");
}
#endif
llvm::Expected<Terminal::Data> Terminal::GetData() {
#if LLDB_ENABLE_TERMIOS
if (!FileDescriptorIsValid())
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"invalid fd");
if (!IsATerminal())
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"fd not a terminal");
Data data;
if (::tcgetattr(m_fd, &data.m_termios) != 0)
return llvm::createStringError(
std::error_code(errno, std::generic_category()),
"unable to get teletype attributes");
return data;
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetData(const Terminal::Data &data) {
#if LLDB_ENABLE_TERMIOS
assert(FileDescriptorIsValid());
assert(IsATerminal());
if (::tcsetattr(m_fd, TCSANOW, &data.m_termios) != 0)
return llvm::createStringError(
std::error_code(errno, std::generic_category()),
"unable to set teletype attributes");
return llvm::Error::success();
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetEcho(bool enabled) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
fd_termios.c_lflag &= ~ECHO;
if (enabled)
fd_termios.c_lflag |= ECHO;
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetCanonical(bool enabled) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
fd_termios.c_lflag &= ~ICANON;
if (enabled)
fd_termios.c_lflag |= ICANON;
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetRaw() {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
::cfmakeraw(&fd_termios);
// Make sure only one character is needed to return from a read
// (cfmakeraw() doesn't do this on NetBSD)
fd_termios.c_cc[VMIN] = 1;
fd_termios.c_cc[VTIME] = 0;
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
#if LLDB_ENABLE_TERMIOS
static llvm::Optional<speed_t> baudRateToConst(unsigned int baud_rate) {
switch (baud_rate) {
#if defined(B50)
case 50:
return B50;
#endif
#if defined(B75)
case 75:
return B75;
#endif
#if defined(B110)
case 110:
return B110;
#endif
#if defined(B134)
case 134:
return B134;
#endif
#if defined(B150)
case 150:
return B150;
#endif
#if defined(B200)
case 200:
return B200;
#endif
#if defined(B300)
case 300:
return B300;
#endif
#if defined(B600)
case 600:
return B600;
#endif
#if defined(B1200)
case 1200:
return B1200;
#endif
#if defined(B1800)
case 1800:
return B1800;
#endif
#if defined(B2400)
case 2400:
return B2400;
#endif
#if defined(B4800)
case 4800:
return B4800;
#endif
#if defined(B9600)
case 9600:
return B9600;
#endif
#if defined(B19200)
case 19200:
return B19200;
#endif
#if defined(B38400)
case 38400:
return B38400;
#endif
#if defined(B57600)
case 57600:
return B57600;
#endif
#if defined(B115200)
case 115200:
return B115200;
#endif
#if defined(B230400)
case 230400:
return B230400;
#endif
#if defined(B460800)
case 460800:
return B460800;
#endif
#if defined(B500000)
case 500000:
return B500000;
#endif
#if defined(B576000)
case 576000:
return B576000;
#endif
#if defined(B921600)
case 921600:
return B921600;
#endif
#if defined(B1000000)
case 1000000:
return B1000000;
#endif
#if defined(B1152000)
case 1152000:
return B1152000;
#endif
#if defined(B1500000)
case 1500000:
return B1500000;
#endif
#if defined(B2000000)
case 2000000:
return B2000000;
#endif
#if defined(B76800)
case 76800:
return B76800;
#endif
#if defined(B153600)
case 153600:
return B153600;
#endif
#if defined(B307200)
case 307200:
return B307200;
#endif
#if defined(B614400)
case 614400:
return B614400;
#endif
#if defined(B2500000)
case 2500000:
return B2500000;
#endif
#if defined(B3000000)
case 3000000:
return B3000000;
#endif
#if defined(B3500000)
case 3500000:
return B3500000;
#endif
#if defined(B4000000)
case 4000000:
return B4000000;
#endif
default:
return llvm::None;
}
}
#endif
llvm::Error Terminal::SetBaudRate(unsigned int baud_rate) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
llvm::Optional<speed_t> val = baudRateToConst(baud_rate);
if (!val) // invalid value
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"baud rate %d unsupported by the platform",
baud_rate);
if (::cfsetispeed(&fd_termios, val.value()) != 0)
return llvm::createStringError(
std::error_code(errno, std::generic_category()),
"setting input baud rate failed");
if (::cfsetospeed(&fd_termios, val.value()) != 0)
return llvm::createStringError(
std::error_code(errno, std::generic_category()),
"setting output baud rate failed");
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetStopBits(unsigned int stop_bits) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
switch (stop_bits) {
case 1:
fd_termios.c_cflag &= ~CSTOPB;
break;
case 2:
fd_termios.c_cflag |= CSTOPB;
break;
default:
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
"invalid stop bit count: %d (must be 1 or 2)", stop_bits);
}
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetParity(Terminal::Parity parity) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
fd_termios.c_cflag &= ~(
#if defined(CMSPAR)
CMSPAR |
#endif
PARENB | PARODD);
if (parity != Parity::No) {
fd_termios.c_cflag |= PARENB;
if (parity == Parity::Odd || parity == Parity::Mark)
fd_termios.c_cflag |= PARODD;
if (parity == Parity::Mark || parity == Parity::Space) {
#if defined(CMSPAR)
fd_termios.c_cflag |= CMSPAR;
#else
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
"space/mark parity is not supported by the platform");
#endif
}
}
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetParityCheck(Terminal::ParityCheck parity_check) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
struct termios &fd_termios = data->m_termios;
fd_termios.c_iflag &= ~(IGNPAR | PARMRK | INPCK);
if (parity_check != ParityCheck::No) {
fd_termios.c_iflag |= INPCK;
if (parity_check == ParityCheck::Ignore)
fd_termios.c_iflag |= IGNPAR;
else if (parity_check == ParityCheck::Mark)
fd_termios.c_iflag |= PARMRK;
}
return SetData(data.get());
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
llvm::Error Terminal::SetHardwareFlowControl(bool enabled) {
#if LLDB_ENABLE_TERMIOS
llvm::Expected<Data> data = GetData();
if (!data)
return data.takeError();
#if defined(CRTSCTS)
struct termios &fd_termios = data->m_termios;
fd_termios.c_cflag &= ~CRTSCTS;
if (enabled)
fd_termios.c_cflag |= CRTSCTS;
return SetData(data.get());
#else // !defined(CRTSCTS)
if (enabled)
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
"hardware flow control is not supported by the platform");
return llvm::Error::success();
#endif // defined(CRTSCTS)
#else // !LLDB_ENABLE_TERMIOS
return termiosMissingError();
#endif // LLDB_ENABLE_TERMIOS
}
TerminalState::TerminalState(Terminal term, bool save_process_group)
: m_tty(term) {
Save(term, save_process_group);
}
TerminalState::~TerminalState() { Restore(); }
void TerminalState::Clear() {
m_tty.Clear();
m_tflags = -1;
m_data.reset();
m_process_group = -1;
}
bool TerminalState::Save(Terminal term, bool save_process_group) {
Clear();
m_tty = term;
if (m_tty.IsATerminal()) {
#if LLDB_ENABLE_POSIX
int fd = m_tty.GetFileDescriptor();
m_tflags = ::fcntl(fd, F_GETFL, 0);
#if LLDB_ENABLE_TERMIOS
std::unique_ptr<Terminal::Data> new_data{new Terminal::Data()};
if (::tcgetattr(fd, &new_data->m_termios) == 0)
m_data = std::move(new_data);
#endif // LLDB_ENABLE_TERMIOS
if (save_process_group)
m_process_group = ::tcgetpgrp(fd);
#endif // LLDB_ENABLE_POSIX
}
return IsValid();
}
bool TerminalState::Restore() const {
#if LLDB_ENABLE_POSIX
if (IsValid()) {
const int fd = m_tty.GetFileDescriptor();
if (TFlagsIsValid())
fcntl(fd, F_SETFL, m_tflags);
#if LLDB_ENABLE_TERMIOS
if (TTYStateIsValid())
tcsetattr(fd, TCSANOW, &m_data->m_termios);
#endif // LLDB_ENABLE_TERMIOS
if (ProcessGroupIsValid()) {
// Save the original signal handler.
void (*saved_sigttou_callback)(int) = nullptr;
saved_sigttou_callback = (void (*)(int))signal(SIGTTOU, SIG_IGN);
// Set the process group
tcsetpgrp(fd, m_process_group);
// Restore the original signal handler.
signal(SIGTTOU, saved_sigttou_callback);
}
return true;
}
#endif // LLDB_ENABLE_POSIX
return false;
}
bool TerminalState::IsValid() const {
return m_tty.FileDescriptorIsValid() &&
(TFlagsIsValid() || TTYStateIsValid() || ProcessGroupIsValid());
}
bool TerminalState::TFlagsIsValid() const { return m_tflags != -1; }
bool TerminalState::TTYStateIsValid() const { return bool(m_data); }
bool TerminalState::ProcessGroupIsValid() const {
return static_cast<int32_t>(m_process_group) != -1;
}
|
