1//===-- IOHandler.cpp -----------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "lldb/Core/IOHandler.h"
10
11#if defined(__APPLE__)
12#include <deque>
13#endif
14#include <string>
15
16#include "lldb/Core/Debugger.h"
17#include "lldb/Host/Config.h"
18#include "lldb/Host/File.h"
19#include "lldb/Host/StreamFile.h"
20#include "lldb/Utility/AnsiTerminal.h"
21#include "lldb/Utility/Predicate.h"
22#include "lldb/Utility/Status.h"
23#include "lldb/Utility/StreamString.h"
24#include "lldb/Utility/StringList.h"
25#include "lldb/lldb-forward.h"
26
27#if LLDB_ENABLE_LIBEDIT
28#include "lldb/Host/Editline.h"
29#endif
30#include "lldb/Interpreter/CommandCompletions.h"
31#include "lldb/Interpreter/CommandInterpreter.h"
32#include "llvm/ADT/StringRef.h"
33
34#ifdef _WIN32
35#include "lldb/Host/windows/windows.h"
36#endif
37
38#include <memory>
39#include <mutex>
40#include <optional>
41
42#include <cassert>
43#include <cctype>
44#include <cerrno>
45#include <clocale>
46#include <cstdint>
47#include <cstdio>
48#include <cstring>
49#include <type_traits>
50
51using namespace lldb;
52using namespace lldb_private;
53using llvm::StringRef;
54
55IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type)
56 : IOHandler(debugger, type,
57 FileSP(), // Adopt STDIN from top input reader
58 LockableStreamFileSP(), // Adopt STDOUT from top input reader
59 LockableStreamFileSP(), // Adopt STDERR from top input reader
60 0 // Flags
61
62 ) {}
63
64IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type,
65 const lldb::FileSP &input_sp,
66 const lldb::LockableStreamFileSP &output_sp,
67 const lldb::LockableStreamFileSP &error_sp, uint32_t flags)
68 : m_debugger(debugger), m_input_sp(input_sp), m_output_sp(output_sp),
69 m_error_sp(error_sp), m_popped(false), m_flags(flags), m_type(type),
70 m_user_data(nullptr), m_done(false), m_active(false) {
71 // If any files are not specified, then adopt them from the top input reader.
72 if (!m_input_sp || !m_output_sp || !m_error_sp)
73 debugger.AdoptTopIOHandlerFilesIfInvalid(in&: m_input_sp, out&: m_output_sp,
74 err&: m_error_sp);
75}
76
77IOHandler::~IOHandler() = default;
78
79int IOHandler::GetInputFD() {
80 return (m_input_sp ? m_input_sp->GetDescriptor() : -1);
81}
82
83int IOHandler::GetOutputFD() {
84 return (m_output_sp ? m_output_sp->GetUnlockedFile().GetDescriptor() : -1);
85}
86
87int IOHandler::GetErrorFD() {
88 return (m_error_sp ? m_error_sp->GetUnlockedFile().GetDescriptor() : -1);
89}
90
91FileSP IOHandler::GetInputFileSP() { return m_input_sp; }
92
93LockableStreamFileSP IOHandler::GetOutputStreamFileSP() { return m_output_sp; }
94
95LockableStreamFileSP IOHandler::GetErrorStreamFileSP() { return m_error_sp; }
96
97bool IOHandler::GetIsInteractive() {
98 return GetInputFileSP() ? GetInputFileSP()->GetIsInteractive() : false;
99}
100
101bool IOHandler::GetIsRealTerminal() {
102 return GetInputFileSP() ? GetInputFileSP()->GetIsRealTerminal() : false;
103}
104
105void IOHandler::SetPopped(bool b) { m_popped.SetValue(value: b, broadcast_type: eBroadcastOnChange); }
106
107void IOHandler::WaitForPop() { m_popped.WaitForValueEqualTo(value: true); }
108
109void IOHandler::PrintAsync(const char *s, size_t len, bool is_stdout) {
110 lldb::LockableStreamFileSP stream_sp = is_stdout ? m_output_sp : m_error_sp;
111 LockedStreamFile locked_Stream = stream_sp->Lock();
112 locked_Stream.Write(src: s, src_len: len);
113}
114
115bool IOHandlerStack::PrintAsync(const char *s, size_t len, bool is_stdout) {
116 std::lock_guard<std::recursive_mutex> guard(m_mutex);
117 if (!m_top)
118 return false;
119 m_top->PrintAsync(s, len, is_stdout);
120 return true;
121}
122
123IOHandlerConfirm::IOHandlerConfirm(Debugger &debugger, llvm::StringRef prompt,
124 bool default_response)
125 : IOHandlerEditline(
126 debugger, IOHandler::Type::Confirm,
127 nullptr, // nullptr editline_name means no history loaded/saved
128 llvm::StringRef(), // No prompt
129 llvm::StringRef(), // No continuation prompt
130 false, // Multi-line
131 false, // Don't colorize the prompt (i.e. the confirm message.)
132 0, *this),
133 m_default_response(default_response), m_user_response(default_response) {
134 StreamString prompt_stream;
135 prompt_stream.PutCString(cstr: prompt);
136 if (m_default_response)
137 prompt_stream.Printf(format: ": [Y/n] ");
138 else
139 prompt_stream.Printf(format: ": [y/N] ");
140
141 SetPrompt(prompt_stream.GetString());
142}
143
144IOHandlerConfirm::~IOHandlerConfirm() = default;
145
146void IOHandlerConfirm::IOHandlerComplete(IOHandler &io_handler,
147 CompletionRequest &request) {
148 if (request.GetRawCursorPos() != 0)
149 return;
150 request.AddCompletion(completion: m_default_response ? "y" : "n");
151}
152
153void IOHandlerConfirm::IOHandlerInputComplete(IOHandler &io_handler,
154 std::string &line) {
155 if (line.empty()) {
156 // User just hit enter, set the response to the default
157 m_user_response = m_default_response;
158 io_handler.SetIsDone(true);
159 return;
160 }
161
162 if (line.size() == 1) {
163 switch (line[0]) {
164 case 'y':
165 case 'Y':
166 m_user_response = true;
167 io_handler.SetIsDone(true);
168 return;
169 case 'n':
170 case 'N':
171 m_user_response = false;
172 io_handler.SetIsDone(true);
173 return;
174 default:
175 break;
176 }
177 }
178
179 if (line == "yes" || line == "YES" || line == "Yes") {
180 m_user_response = true;
181 io_handler.SetIsDone(true);
182 } else if (line == "no" || line == "NO" || line == "No") {
183 m_user_response = false;
184 io_handler.SetIsDone(true);
185 }
186}
187
188std::optional<std::string>
189IOHandlerDelegate::IOHandlerSuggestion(IOHandler &io_handler,
190 llvm::StringRef line) {
191 return io_handler.GetDebugger()
192 .GetCommandInterpreter()
193 .GetAutoSuggestionForCommand(line);
194}
195
196void IOHandlerDelegate::IOHandlerComplete(IOHandler &io_handler,
197 CompletionRequest &request) {
198 switch (m_completion) {
199 case Completion::None:
200 break;
201 case Completion::LLDBCommand:
202 io_handler.GetDebugger().GetCommandInterpreter().HandleCompletion(request);
203 break;
204 case Completion::Expression:
205 lldb_private::CommandCompletions::InvokeCommonCompletionCallbacks(
206 interpreter&: io_handler.GetDebugger().GetCommandInterpreter(),
207 completion_mask: lldb::eVariablePathCompletion, request, searcher: nullptr);
208 break;
209 }
210}
211
212IOHandlerEditline::IOHandlerEditline(
213 Debugger &debugger, IOHandler::Type type,
214 const char *editline_name, // Used for saving history files
215 llvm::StringRef prompt, llvm::StringRef continuation_prompt,
216 bool multi_line, bool color, uint32_t line_number_start,
217 IOHandlerDelegate &delegate)
218 : IOHandlerEditline(
219 debugger, type,
220 FileSP(), // Inherit input from top input reader
221 LockableStreamFileSP(), // Inherit output from top input reader
222 LockableStreamFileSP(), // Inherit error from top input reader
223 0, // Flags
224 editline_name, // Used for saving history files
225 prompt, continuation_prompt, multi_line, color, line_number_start,
226 delegate) {}
227
228IOHandlerEditline::IOHandlerEditline(
229 Debugger &debugger, IOHandler::Type type, const lldb::FileSP &input_sp,
230 const lldb::LockableStreamFileSP &output_sp,
231 const lldb::LockableStreamFileSP &error_sp, uint32_t flags,
232 const char *editline_name, // Used for saving history files
233 llvm::StringRef prompt, llvm::StringRef continuation_prompt,
234 bool multi_line, bool color, uint32_t line_number_start,
235 IOHandlerDelegate &delegate)
236 : IOHandler(debugger, type, input_sp, output_sp, error_sp, flags),
237#if LLDB_ENABLE_LIBEDIT
238 m_editline_up(),
239#endif
240 m_delegate(delegate), m_prompt(), m_continuation_prompt(),
241 m_current_lines_ptr(nullptr), m_base_line_number(line_number_start),
242 m_curr_line_idx(UINT32_MAX), m_multi_line(multi_line), m_color(color),
243 m_interrupt_exits(true) {
244 SetPrompt(prompt);
245
246#if LLDB_ENABLE_LIBEDIT
247 const bool use_editline = m_input_sp && m_output_sp && m_error_sp &&
248 m_input_sp->GetIsRealTerminal();
249 if (use_editline) {
250 m_editline_up = std::make_unique<Editline>(
251 args&: editline_name, args: m_input_sp ? m_input_sp->GetStream() : nullptr,
252 args&: m_output_sp, args&: m_error_sp, args&: m_color);
253 m_editline_up->SetIsInputCompleteCallback(
254 [this](Editline *editline, StringList &lines) {
255 return this->IsInputCompleteCallback(editline, lines);
256 });
257
258 m_editline_up->SetAutoCompleteCallback([this](CompletionRequest &request) {
259 this->AutoCompleteCallback(request);
260 });
261 m_editline_up->SetRedrawCallback([this]() { this->RedrawCallback(); });
262
263 if (debugger.GetUseAutosuggestion()) {
264 m_editline_up->SetSuggestionCallback([this](llvm::StringRef line) {
265 return this->SuggestionCallback(line);
266 });
267 m_editline_up->SetSuggestionAnsiPrefix(ansi::FormatAnsiTerminalCodes(
268 format: debugger.GetAutosuggestionAnsiPrefix()));
269 m_editline_up->SetSuggestionAnsiSuffix(ansi::FormatAnsiTerminalCodes(
270 format: debugger.GetAutosuggestionAnsiSuffix()));
271 }
272 // See if the delegate supports fixing indentation
273 const char *indent_chars = delegate.IOHandlerGetFixIndentationCharacters();
274 if (indent_chars) {
275 // The delegate does support indentation, hook it up so when any
276 // indentation character is typed, the delegate gets a chance to fix it
277 FixIndentationCallbackType f = [this](Editline *editline,
278 const StringList &lines,
279 int cursor_position) {
280 return this->FixIndentationCallback(editline, lines, cursor_position);
281 };
282 m_editline_up->SetFixIndentationCallback(callback: std::move(f), indent_chars);
283 }
284 }
285#endif
286 SetBaseLineNumber(m_base_line_number);
287 SetPrompt(prompt);
288 SetContinuationPrompt(continuation_prompt);
289}
290
291IOHandlerEditline::~IOHandlerEditline() {
292#if LLDB_ENABLE_LIBEDIT
293 m_editline_up.reset();
294#endif
295}
296
297void IOHandlerEditline::Activate() {
298 IOHandler::Activate();
299 m_delegate.IOHandlerActivated(io_handler&: *this, interactive: GetIsInteractive());
300}
301
302void IOHandlerEditline::Deactivate() {
303 IOHandler::Deactivate();
304 m_delegate.IOHandlerDeactivated(io_handler&: *this);
305}
306
307void IOHandlerEditline::TerminalSizeChanged() {
308#if LLDB_ENABLE_LIBEDIT
309 if (m_editline_up)
310 m_editline_up->TerminalSizeChanged();
311#endif
312}
313
314// Split out a line from the buffer, if there is a full one to get.
315static std::optional<std::string> SplitLine(std::string &line_buffer) {
316 size_t pos = line_buffer.find(c: '\n');
317 if (pos == std::string::npos)
318 return std::nullopt;
319 std::string line =
320 std::string(StringRef(line_buffer.c_str(), pos).rtrim(Chars: "\n\r"));
321 line_buffer = line_buffer.substr(pos: pos + 1);
322 return line;
323}
324
325// If the final line of the file ends without a end-of-line, return
326// it as a line anyway.
327static std::optional<std::string> SplitLineEOF(std::string &line_buffer) {
328 if (llvm::all_of(Range&: line_buffer, P: llvm::isSpace))
329 return std::nullopt;
330 std::string line = std::move(line_buffer);
331 line_buffer.clear();
332 return line;
333}
334
335bool IOHandlerEditline::GetLine(std::string &line, bool &interrupted) {
336#if LLDB_ENABLE_LIBEDIT
337 if (m_editline_up) {
338 return m_editline_up->GetLine(line, interrupted);
339 }
340#endif
341
342 line.clear();
343
344 if (GetIsInteractive()) {
345 const char *prompt = nullptr;
346
347 if (m_multi_line && m_curr_line_idx > 0)
348 prompt = GetContinuationPrompt();
349
350 if (prompt == nullptr)
351 prompt = GetPrompt();
352
353 if (prompt && prompt[0]) {
354 if (m_output_sp) {
355 LockedStreamFile locked_stream = m_output_sp->Lock();
356 locked_stream.Printf(format: "%s", prompt);
357 }
358 }
359 }
360
361 std::optional<std::string> got_line = SplitLine(line_buffer&: m_line_buffer);
362
363 if (!got_line && !m_input_sp) {
364 // No more input file, we are done...
365 SetIsDone(true);
366 return false;
367 }
368
369 FILE *in = m_input_sp ? m_input_sp->GetStream() : nullptr;
370 char buffer[256];
371
372 if (!got_line && !in && m_input_sp) {
373 // there is no FILE*, fall back on just reading bytes from the stream.
374 while (!got_line) {
375 size_t bytes_read = sizeof(buffer);
376 Status error = m_input_sp->Read(buf: (void *)buffer, num_bytes&: bytes_read);
377 if (error.Success() && !bytes_read) {
378 got_line = SplitLineEOF(line_buffer&: m_line_buffer);
379 break;
380 }
381 if (error.Fail())
382 break;
383 m_line_buffer += StringRef(buffer, bytes_read);
384 got_line = SplitLine(line_buffer&: m_line_buffer);
385 }
386 }
387
388 if (!got_line && in) {
389 while (!got_line) {
390 char *r = fgets(s: buffer, n: sizeof(buffer), stream: in);
391#ifdef _WIN32
392 // ReadFile on Windows is supposed to set ERROR_OPERATION_ABORTED
393 // according to the docs on MSDN. However, this has evidently been a
394 // known bug since Windows 8. Therefore, we can't detect if a signal
395 // interrupted in the fgets. So pressing ctrl-c causes the repl to end
396 // and the process to exit. A temporary workaround is just to attempt to
397 // fgets twice until this bug is fixed.
398 if (r == nullptr)
399 r = fgets(buffer, sizeof(buffer), in);
400 // this is the equivalent of EINTR for Windows
401 if (r == nullptr && GetLastError() == ERROR_OPERATION_ABORTED)
402 continue;
403#endif
404 if (r == nullptr) {
405 if (ferror(stream: in) && errno == EINTR)
406 continue;
407 if (feof(stream: in))
408 got_line = SplitLineEOF(line_buffer&: m_line_buffer);
409 break;
410 }
411 m_line_buffer += buffer;
412 got_line = SplitLine(line_buffer&: m_line_buffer);
413 }
414 }
415
416 if (got_line) {
417 line = *got_line;
418 }
419
420 return (bool)got_line;
421}
422
423#if LLDB_ENABLE_LIBEDIT
424bool IOHandlerEditline::IsInputCompleteCallback(Editline *editline,
425 StringList &lines) {
426 return m_delegate.IOHandlerIsInputComplete(io_handler&: *this, lines);
427}
428
429int IOHandlerEditline::FixIndentationCallback(Editline *editline,
430 const StringList &lines,
431 int cursor_position) {
432 return m_delegate.IOHandlerFixIndentation(io_handler&: *this, lines, cursor_position);
433}
434
435std::optional<std::string>
436IOHandlerEditline::SuggestionCallback(llvm::StringRef line) {
437 return m_delegate.IOHandlerSuggestion(io_handler&: *this, line);
438}
439
440void IOHandlerEditline::AutoCompleteCallback(CompletionRequest &request) {
441 m_delegate.IOHandlerComplete(io_handler&: *this, request);
442}
443
444void IOHandlerEditline::RedrawCallback() {
445 m_debugger.RedrawStatusline(/*update=*/false);
446}
447
448#endif
449
450const char *IOHandlerEditline::GetPrompt() {
451#if LLDB_ENABLE_LIBEDIT
452 if (m_editline_up) {
453 return m_editline_up->GetPrompt();
454 } else {
455#endif
456 if (m_prompt.empty())
457 return nullptr;
458#if LLDB_ENABLE_LIBEDIT
459 }
460#endif
461 return m_prompt.c_str();
462}
463
464bool IOHandlerEditline::SetPrompt(llvm::StringRef prompt) {
465 m_prompt = std::string(prompt);
466
467#if LLDB_ENABLE_LIBEDIT
468 if (m_editline_up) {
469 m_editline_up->SetPrompt(m_prompt.empty() ? nullptr : m_prompt.c_str());
470 m_editline_up->SetPromptAnsiPrefix(
471 ansi::FormatAnsiTerminalCodes(format: m_debugger.GetPromptAnsiPrefix()));
472 m_editline_up->SetPromptAnsiSuffix(
473 ansi::FormatAnsiTerminalCodes(format: m_debugger.GetPromptAnsiSuffix()));
474 }
475#endif
476 return true;
477}
478
479bool IOHandlerEditline::SetUseColor(bool use_color) {
480 m_color = use_color;
481
482#if LLDB_ENABLE_LIBEDIT
483 if (m_editline_up) {
484 m_editline_up->UseColor(use_color);
485 m_editline_up->SetSuggestionAnsiPrefix(ansi::FormatAnsiTerminalCodes(
486 format: m_debugger.GetAutosuggestionAnsiPrefix()));
487 m_editline_up->SetSuggestionAnsiSuffix(ansi::FormatAnsiTerminalCodes(
488 format: m_debugger.GetAutosuggestionAnsiSuffix()));
489 }
490#endif
491 return true;
492}
493
494const char *IOHandlerEditline::GetContinuationPrompt() {
495 return (m_continuation_prompt.empty() ? nullptr
496 : m_continuation_prompt.c_str());
497}
498
499void IOHandlerEditline::SetContinuationPrompt(llvm::StringRef prompt) {
500 m_continuation_prompt = std::string(prompt);
501
502#if LLDB_ENABLE_LIBEDIT
503 if (m_editline_up)
504 m_editline_up->SetContinuationPrompt(m_continuation_prompt.empty()
505 ? nullptr
506 : m_continuation_prompt.c_str());
507#endif
508}
509
510void IOHandlerEditline::SetBaseLineNumber(uint32_t line) {
511 m_base_line_number = line;
512}
513
514uint32_t IOHandlerEditline::GetCurrentLineIndex() const {
515#if LLDB_ENABLE_LIBEDIT
516 if (m_editline_up)
517 return m_editline_up->GetCurrentLine();
518#endif
519 return m_curr_line_idx;
520}
521
522StringList IOHandlerEditline::GetCurrentLines() const {
523#if LLDB_ENABLE_LIBEDIT
524 if (m_editline_up)
525 return m_editline_up->GetInputAsStringList();
526#endif
527 // When libedit is not used, the current lines can be gotten from
528 // `m_current_lines_ptr`, which is updated whenever a new line is processed.
529 // This doesn't happen when libedit is used, in which case
530 // `m_current_lines_ptr` is only updated when the full input is terminated.
531
532 if (m_current_lines_ptr)
533 return *m_current_lines_ptr;
534 return StringList();
535}
536
537bool IOHandlerEditline::GetLines(StringList &lines, bool &interrupted) {
538 m_current_lines_ptr = &lines;
539
540 bool success = false;
541#if LLDB_ENABLE_LIBEDIT
542 if (m_editline_up) {
543 return m_editline_up->GetLines(first_line_number: m_base_line_number, lines, interrupted);
544 } else {
545#endif
546 bool done = false;
547 Status error;
548
549 while (!done) {
550 // Show line numbers if we are asked to
551 std::string line;
552 if (m_base_line_number > 0 && GetIsInteractive()) {
553 if (m_output_sp) {
554 LockedStreamFile locked_stream = m_output_sp->Lock();
555 locked_stream.Printf(format: "%u%s",
556 m_base_line_number + (uint32_t)lines.GetSize(),
557 GetPrompt() == nullptr ? " " : "");
558 }
559 }
560
561 m_curr_line_idx = lines.GetSize();
562
563 bool interrupted = false;
564 if (GetLine(line, interrupted) && !interrupted) {
565 lines.AppendString(s: line);
566 done = m_delegate.IOHandlerIsInputComplete(io_handler&: *this, lines);
567 } else {
568 done = true;
569 }
570 }
571 success = lines.GetSize() > 0;
572#if LLDB_ENABLE_LIBEDIT
573 }
574#endif
575 return success;
576}
577
578// Each IOHandler gets to run until it is done. It should read data from the
579// "in" and place output into "out" and "err and return when done.
580void IOHandlerEditline::Run() {
581 std::string line;
582 while (IsActive()) {
583 bool interrupted = false;
584 if (m_multi_line) {
585 StringList lines;
586 if (GetLines(lines, interrupted)) {
587 if (interrupted) {
588 m_done = m_interrupt_exits;
589 m_delegate.IOHandlerInputInterrupted(io_handler&: *this, data&: line);
590
591 } else {
592 line = lines.CopyList();
593 m_delegate.IOHandlerInputComplete(io_handler&: *this, data&: line);
594 }
595 } else {
596 m_done = true;
597 }
598 } else {
599 if (GetLine(line, interrupted)) {
600 if (interrupted)
601 m_delegate.IOHandlerInputInterrupted(io_handler&: *this, data&: line);
602 else
603 m_delegate.IOHandlerInputComplete(io_handler&: *this, data&: line);
604 } else {
605 m_done = true;
606 }
607 }
608 }
609}
610
611void IOHandlerEditline::Cancel() {
612#if LLDB_ENABLE_LIBEDIT
613 if (m_editline_up)
614 m_editline_up->Cancel();
615#endif
616}
617
618bool IOHandlerEditline::Interrupt() {
619 // Let the delgate handle it first
620 if (m_delegate.IOHandlerInterrupt(io_handler&: *this))
621 return true;
622
623#if LLDB_ENABLE_LIBEDIT
624 if (m_editline_up)
625 return m_editline_up->Interrupt();
626#endif
627 return false;
628}
629
630void IOHandlerEditline::GotEOF() {
631#if LLDB_ENABLE_LIBEDIT
632 if (m_editline_up)
633 m_editline_up->Interrupt();
634#endif
635}
636
637void IOHandlerEditline::PrintAsync(const char *s, size_t len, bool is_stdout) {
638#if LLDB_ENABLE_LIBEDIT
639 if (m_editline_up) {
640 lldb::LockableStreamFileSP stream_sp = is_stdout ? m_output_sp : m_error_sp;
641 m_editline_up->PrintAsync(stream_sp, s, len);
642 } else
643#endif
644 {
645#ifdef _WIN32
646 const char *prompt = GetPrompt();
647 if (prompt) {
648 // Back up over previous prompt using Windows API
649 CONSOLE_SCREEN_BUFFER_INFO screen_buffer_info;
650 HANDLE console_handle = GetStdHandle(STD_OUTPUT_HANDLE);
651 GetConsoleScreenBufferInfo(console_handle, &screen_buffer_info);
652 COORD coord = screen_buffer_info.dwCursorPosition;
653 coord.X -= strlen(prompt);
654 if (coord.X < 0)
655 coord.X = 0;
656 SetConsoleCursorPosition(console_handle, coord);
657 }
658#endif
659 IOHandler::PrintAsync(s, len, is_stdout);
660#ifdef _WIN32
661 if (prompt)
662 IOHandler::PrintAsync(prompt, strlen(prompt), is_stdout);
663#endif
664 }
665}
666

source code of lldb/source/Core/IOHandler.cpp