GDBRemoteCommunication.cpp revision 269024
1//===-- GDBRemoteCommunication.cpp ------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10 11#include "GDBRemoteCommunication.h" 12 13// C Includes 14#include <limits.h> 15#include <string.h> 16#include <sys/stat.h> 17 18// C++ Includes 19// Other libraries and framework includes 20#include "lldb/Core/ConnectionFileDescriptor.h" 21#include "lldb/Core/Log.h" 22#include "lldb/Core/StreamFile.h" 23#include "lldb/Core/StreamString.h" 24#include "lldb/Host/FileSpec.h" 25#include "lldb/Host/Host.h" 26#include "lldb/Host/TimeValue.h" 27#include "lldb/Target/Process.h" 28 29// Project includes 30#include "ProcessGDBRemoteLog.h" 31 32#define DEBUGSERVER_BASENAME "debugserver" 33 34using namespace lldb; 35using namespace lldb_private; 36 37GDBRemoteCommunication::History::History (uint32_t size) : 38 m_packets(), 39 m_curr_idx (0), 40 m_total_packet_count (0), 41 m_dumped_to_log (false) 42{ 43 m_packets.resize(size); 44} 45 46GDBRemoteCommunication::History::~History () 47{ 48} 49 50void 51GDBRemoteCommunication::History::AddPacket (char packet_char, 52 PacketType type, 53 uint32_t bytes_transmitted) 54{ 55 const size_t size = m_packets.size(); 56 if (size > 0) 57 { 58 const uint32_t idx = GetNextIndex(); 59 m_packets[idx].packet.assign (1, packet_char); 60 m_packets[idx].type = type; 61 m_packets[idx].bytes_transmitted = bytes_transmitted; 62 m_packets[idx].packet_idx = m_total_packet_count; 63 m_packets[idx].tid = Host::GetCurrentThreadID(); 64 } 65} 66 67void 68GDBRemoteCommunication::History::AddPacket (const std::string &src, 69 uint32_t src_len, 70 PacketType type, 71 uint32_t bytes_transmitted) 72{ 73 const size_t size = m_packets.size(); 74 if (size > 0) 75 { 76 const uint32_t idx = GetNextIndex(); 77 m_packets[idx].packet.assign (src, 0, src_len); 78 m_packets[idx].type = type; 79 m_packets[idx].bytes_transmitted = bytes_transmitted; 80 m_packets[idx].packet_idx = m_total_packet_count; 81 m_packets[idx].tid = Host::GetCurrentThreadID(); 82 } 83} 84 85void 86GDBRemoteCommunication::History::Dump (lldb_private::Stream &strm) const 87{ 88 const uint32_t size = GetNumPacketsInHistory (); 89 const uint32_t first_idx = GetFirstSavedPacketIndex (); 90 const uint32_t stop_idx = m_curr_idx + size; 91 for (uint32_t i = first_idx; i < stop_idx; ++i) 92 { 93 const uint32_t idx = NormalizeIndex (i); 94 const Entry &entry = m_packets[idx]; 95 if (entry.type == ePacketTypeInvalid || entry.packet.empty()) 96 break; 97 strm.Printf ("history[%u] tid=0x%4.4" PRIx64 " <%4u> %s packet: %s\n", 98 entry.packet_idx, 99 entry.tid, 100 entry.bytes_transmitted, 101 (entry.type == ePacketTypeSend) ? "send" : "read", 102 entry.packet.c_str()); 103 } 104} 105 106void 107GDBRemoteCommunication::History::Dump (lldb_private::Log *log) const 108{ 109 if (log && !m_dumped_to_log) 110 { 111 m_dumped_to_log = true; 112 const uint32_t size = GetNumPacketsInHistory (); 113 const uint32_t first_idx = GetFirstSavedPacketIndex (); 114 const uint32_t stop_idx = m_curr_idx + size; 115 for (uint32_t i = first_idx; i < stop_idx; ++i) 116 { 117 const uint32_t idx = NormalizeIndex (i); 118 const Entry &entry = m_packets[idx]; 119 if (entry.type == ePacketTypeInvalid || entry.packet.empty()) 120 break; 121 log->Printf ("history[%u] tid=0x%4.4" PRIx64 " <%4u> %s packet: %s", 122 entry.packet_idx, 123 entry.tid, 124 entry.bytes_transmitted, 125 (entry.type == ePacketTypeSend) ? "send" : "read", 126 entry.packet.c_str()); 127 } 128 } 129} 130 131//---------------------------------------------------------------------- 132// GDBRemoteCommunication constructor 133//---------------------------------------------------------------------- 134GDBRemoteCommunication::GDBRemoteCommunication(const char *comm_name, 135 const char *listener_name, 136 bool is_platform) : 137 Communication(comm_name), 138#ifdef LLDB_CONFIGURATION_DEBUG 139 m_packet_timeout (1000), 140#else 141 m_packet_timeout (1), 142#endif 143 m_sequence_mutex (Mutex::eMutexTypeRecursive), 144 m_public_is_running (false), 145 m_private_is_running (false), 146 m_history (512), 147 m_send_acks (true), 148 m_is_platform (is_platform), 149 m_listen_thread (LLDB_INVALID_HOST_THREAD), 150 m_listen_url () 151{ 152} 153 154//---------------------------------------------------------------------- 155// Destructor 156//---------------------------------------------------------------------- 157GDBRemoteCommunication::~GDBRemoteCommunication() 158{ 159 if (IsConnected()) 160 { 161 Disconnect(); 162 } 163} 164 165char 166GDBRemoteCommunication::CalculcateChecksum (const char *payload, size_t payload_length) 167{ 168 int checksum = 0; 169 170 for (size_t i = 0; i < payload_length; ++i) 171 checksum += payload[i]; 172 173 return checksum & 255; 174} 175 176size_t 177GDBRemoteCommunication::SendAck () 178{ 179 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 180 ConnectionStatus status = eConnectionStatusSuccess; 181 char ch = '+'; 182 const size_t bytes_written = Write (&ch, 1, status, NULL); 183 if (log) 184 log->Printf ("<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); 185 m_history.AddPacket (ch, History::ePacketTypeSend, bytes_written); 186 return bytes_written; 187} 188 189size_t 190GDBRemoteCommunication::SendNack () 191{ 192 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 193 ConnectionStatus status = eConnectionStatusSuccess; 194 char ch = '-'; 195 const size_t bytes_written = Write (&ch, 1, status, NULL); 196 if (log) 197 log->Printf("<%4" PRIu64 "> send packet: %c", (uint64_t)bytes_written, ch); 198 m_history.AddPacket (ch, History::ePacketTypeSend, bytes_written); 199 return bytes_written; 200} 201 202GDBRemoteCommunication::PacketResult 203GDBRemoteCommunication::SendPacket (const char *payload, size_t payload_length) 204{ 205 Mutex::Locker locker(m_sequence_mutex); 206 return SendPacketNoLock (payload, payload_length); 207} 208 209GDBRemoteCommunication::PacketResult 210GDBRemoteCommunication::SendPacketNoLock (const char *payload, size_t payload_length) 211{ 212 if (IsConnected()) 213 { 214 StreamString packet(0, 4, eByteOrderBig); 215 216 packet.PutChar('$'); 217 packet.Write (payload, payload_length); 218 packet.PutChar('#'); 219 packet.PutHex8(CalculcateChecksum (payload, payload_length)); 220 221 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 222 ConnectionStatus status = eConnectionStatusSuccess; 223 size_t bytes_written = Write (packet.GetData(), packet.GetSize(), status, NULL); 224 if (log) 225 { 226 // If logging was just enabled and we have history, then dump out what 227 // we have to the log so we get the historical context. The Dump() call that 228 // logs all of the packet will set a boolean so that we don't dump this more 229 // than once 230 if (!m_history.DidDumpToLog ()) 231 m_history.Dump (log); 232 233 log->Printf("<%4" PRIu64 "> send packet: %.*s", (uint64_t)bytes_written, (int)packet.GetSize(), packet.GetData()); 234 } 235 236 m_history.AddPacket (packet.GetString(), packet.GetSize(), History::ePacketTypeSend, bytes_written); 237 238 239 if (bytes_written == packet.GetSize()) 240 { 241 if (GetSendAcks ()) 242 return GetAck (); 243 else 244 return PacketResult::Success; 245 } 246 else 247 { 248 if (log) 249 log->Printf ("error: failed to send packet: %.*s", (int)packet.GetSize(), packet.GetData()); 250 } 251 } 252 return PacketResult::ErrorSendFailed; 253} 254 255GDBRemoteCommunication::PacketResult 256GDBRemoteCommunication::GetAck () 257{ 258 StringExtractorGDBRemote packet; 259 PacketResult result = WaitForPacketWithTimeoutMicroSecondsNoLock (packet, GetPacketTimeoutInMicroSeconds ()); 260 if (result == PacketResult::Success) 261 { 262 if (packet.GetResponseType() == StringExtractorGDBRemote::ResponseType::eAck) 263 return PacketResult::Success; 264 else 265 return PacketResult::ErrorSendAck; 266 } 267 return result; 268} 269 270bool 271GDBRemoteCommunication::GetSequenceMutex (Mutex::Locker& locker, const char *failure_message) 272{ 273 if (IsRunning()) 274 return locker.TryLock (m_sequence_mutex, failure_message); 275 276 locker.Lock (m_sequence_mutex); 277 return true; 278} 279 280 281bool 282GDBRemoteCommunication::WaitForNotRunningPrivate (const TimeValue *timeout_ptr) 283{ 284 return m_private_is_running.WaitForValueEqualTo (false, timeout_ptr, NULL); 285} 286 287GDBRemoteCommunication::PacketResult 288GDBRemoteCommunication::WaitForPacketWithTimeoutMicroSecondsNoLock (StringExtractorGDBRemote &packet, uint32_t timeout_usec) 289{ 290 uint8_t buffer[8192]; 291 Error error; 292 293 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS | GDBR_LOG_VERBOSE)); 294 295 // Check for a packet from our cache first without trying any reading... 296 if (CheckForPacket (NULL, 0, packet)) 297 return PacketResult::Success; 298 299 bool timed_out = false; 300 bool disconnected = false; 301 while (IsConnected() && !timed_out) 302 { 303 lldb::ConnectionStatus status = eConnectionStatusNoConnection; 304 size_t bytes_read = Read (buffer, sizeof(buffer), timeout_usec, status, &error); 305 306 if (log) 307 log->Printf ("%s: Read (buffer, (sizeof(buffer), timeout_usec = 0x%x, status = %s, error = %s) => bytes_read = %" PRIu64, 308 __PRETTY_FUNCTION__, 309 timeout_usec, 310 Communication::ConnectionStatusAsCString (status), 311 error.AsCString(), 312 (uint64_t)bytes_read); 313 314 if (bytes_read > 0) 315 { 316 if (CheckForPacket (buffer, bytes_read, packet)) 317 return PacketResult::Success; 318 } 319 else 320 { 321 switch (status) 322 { 323 case eConnectionStatusTimedOut: 324 timed_out = true; 325 break; 326 case eConnectionStatusSuccess: 327 //printf ("status = success but error = %s\n", error.AsCString("<invalid>")); 328 break; 329 330 case eConnectionStatusEndOfFile: 331 case eConnectionStatusNoConnection: 332 case eConnectionStatusLostConnection: 333 case eConnectionStatusError: 334 disconnected = true; 335 Disconnect(); 336 break; 337 } 338 } 339 } 340 packet.Clear (); 341 if (disconnected) 342 return PacketResult::ErrorDisconnected; 343 if (timed_out) 344 return PacketResult::ErrorReplyTimeout; 345 else 346 return PacketResult::ErrorReplyFailed; 347} 348 349bool 350GDBRemoteCommunication::CheckForPacket (const uint8_t *src, size_t src_len, StringExtractorGDBRemote &packet) 351{ 352 // Put the packet data into the buffer in a thread safe fashion 353 Mutex::Locker locker(m_bytes_mutex); 354 355 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 356 357 if (src && src_len > 0) 358 { 359 if (log && log->GetVerbose()) 360 { 361 StreamString s; 362 log->Printf ("GDBRemoteCommunication::%s adding %u bytes: %.*s", 363 __FUNCTION__, 364 (uint32_t)src_len, 365 (uint32_t)src_len, 366 src); 367 } 368 m_bytes.append ((const char *)src, src_len); 369 } 370 371 // Parse up the packets into gdb remote packets 372 if (!m_bytes.empty()) 373 { 374 // end_idx must be one past the last valid packet byte. Start 375 // it off with an invalid value that is the same as the current 376 // index. 377 size_t content_start = 0; 378 size_t content_length = 0; 379 size_t total_length = 0; 380 size_t checksum_idx = std::string::npos; 381 382 switch (m_bytes[0]) 383 { 384 case '+': // Look for ack 385 case '-': // Look for cancel 386 case '\x03': // ^C to halt target 387 content_length = total_length = 1; // The command is one byte long... 388 break; 389 390 case '$': 391 // Look for a standard gdb packet? 392 { 393 size_t hash_pos = m_bytes.find('#'); 394 if (hash_pos != std::string::npos) 395 { 396 if (hash_pos + 2 < m_bytes.size()) 397 { 398 checksum_idx = hash_pos + 1; 399 // Skip the dollar sign 400 content_start = 1; 401 // Don't include the # in the content or the $ in the content length 402 content_length = hash_pos - 1; 403 404 total_length = hash_pos + 3; // Skip the # and the two hex checksum bytes 405 } 406 else 407 { 408 // Checksum bytes aren't all here yet 409 content_length = std::string::npos; 410 } 411 } 412 } 413 break; 414 415 default: 416 { 417 // We have an unexpected byte and we need to flush all bad 418 // data that is in m_bytes, so we need to find the first 419 // byte that is a '+' (ACK), '-' (NACK), \x03 (CTRL+C interrupt), 420 // or '$' character (start of packet header) or of course, 421 // the end of the data in m_bytes... 422 const size_t bytes_len = m_bytes.size(); 423 bool done = false; 424 uint32_t idx; 425 for (idx = 1; !done && idx < bytes_len; ++idx) 426 { 427 switch (m_bytes[idx]) 428 { 429 case '+': 430 case '-': 431 case '\x03': 432 case '$': 433 done = true; 434 break; 435 436 default: 437 break; 438 } 439 } 440 if (log) 441 log->Printf ("GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'", 442 __FUNCTION__, idx, idx, m_bytes.c_str()); 443 m_bytes.erase(0, idx); 444 } 445 break; 446 } 447 448 if (content_length == std::string::npos) 449 { 450 packet.Clear(); 451 return false; 452 } 453 else if (total_length > 0) 454 { 455 456 // We have a valid packet... 457 assert (content_length <= m_bytes.size()); 458 assert (total_length <= m_bytes.size()); 459 assert (content_length <= total_length); 460 461 bool success = true; 462 std::string &packet_str = packet.GetStringRef(); 463 464 465 if (log) 466 { 467 // If logging was just enabled and we have history, then dump out what 468 // we have to the log so we get the historical context. The Dump() call that 469 // logs all of the packet will set a boolean so that we don't dump this more 470 // than once 471 if (!m_history.DidDumpToLog ()) 472 m_history.Dump (log); 473 474 log->Printf("<%4" PRIu64 "> read packet: %.*s", (uint64_t)total_length, (int)(total_length), m_bytes.c_str()); 475 } 476 477 m_history.AddPacket (m_bytes.c_str(), total_length, History::ePacketTypeRecv, total_length); 478 479 // Clear packet_str in case there is some existing data in it. 480 packet_str.clear(); 481 // Copy the packet from m_bytes to packet_str expanding the 482 // run-length encoding in the process. 483 // Reserve enough byte for the most common case (no RLE used) 484 packet_str.reserve(m_bytes.length()); 485 for (std::string::const_iterator c = m_bytes.begin() + content_start; c != m_bytes.begin() + content_start + content_length; ++c) 486 { 487 if (*c == '*') 488 { 489 // '*' indicates RLE. Next character will give us the 490 // repeat count and previous character is what is to be 491 // repeated. 492 char char_to_repeat = packet_str.back(); 493 // Number of time the previous character is repeated 494 int repeat_count = *++c + 3 - ' '; 495 // We have the char_to_repeat and repeat_count. Now push 496 // it in the packet. 497 for (int i = 0; i < repeat_count; ++i) 498 packet_str.push_back(char_to_repeat); 499 } 500 else if (*c == 0x7d) 501 { 502 // 0x7d is the escape character. The next character is to 503 // be XOR'd with 0x20. 504 char escapee = *++c ^ 0x20; 505 packet_str.push_back(escapee); 506 } 507 else 508 { 509 packet_str.push_back(*c); 510 } 511 } 512 513 if (m_bytes[0] == '$') 514 { 515 assert (checksum_idx < m_bytes.size()); 516 if (::isxdigit (m_bytes[checksum_idx+0]) || 517 ::isxdigit (m_bytes[checksum_idx+1])) 518 { 519 if (GetSendAcks ()) 520 { 521 const char *packet_checksum_cstr = &m_bytes[checksum_idx]; 522 char packet_checksum = strtol (packet_checksum_cstr, NULL, 16); 523 char actual_checksum = CalculcateChecksum (packet_str.c_str(), packet_str.size()); 524 success = packet_checksum == actual_checksum; 525 if (!success) 526 { 527 if (log) 528 log->Printf ("error: checksum mismatch: %.*s expected 0x%2.2x, got 0x%2.2x", 529 (int)(total_length), 530 m_bytes.c_str(), 531 (uint8_t)packet_checksum, 532 (uint8_t)actual_checksum); 533 } 534 // Send the ack or nack if needed 535 if (!success) 536 SendNack(); 537 else 538 SendAck(); 539 } 540 } 541 else 542 { 543 success = false; 544 if (log) 545 log->Printf ("error: invalid checksum in packet: '%s'\n", m_bytes.c_str()); 546 } 547 } 548 549 m_bytes.erase(0, total_length); 550 packet.SetFilePos(0); 551 return success; 552 } 553 } 554 packet.Clear(); 555 return false; 556} 557 558Error 559GDBRemoteCommunication::StartListenThread (const char *hostname, uint16_t port) 560{ 561 Error error; 562 if (IS_VALID_LLDB_HOST_THREAD(m_listen_thread)) 563 { 564 error.SetErrorString("listen thread already running"); 565 } 566 else 567 { 568 char listen_url[512]; 569 if (hostname && hostname[0]) 570 snprintf(listen_url, sizeof(listen_url), "listen://%s:%i", hostname, port); 571 else 572 snprintf(listen_url, sizeof(listen_url), "listen://%i", port); 573 m_listen_url = listen_url; 574 SetConnection(new ConnectionFileDescriptor()); 575 m_listen_thread = Host::ThreadCreate (listen_url, GDBRemoteCommunication::ListenThread, this, &error); 576 } 577 return error; 578} 579 580bool 581GDBRemoteCommunication::JoinListenThread () 582{ 583 if (IS_VALID_LLDB_HOST_THREAD(m_listen_thread)) 584 { 585 Host::ThreadJoin(m_listen_thread, NULL, NULL); 586 m_listen_thread = LLDB_INVALID_HOST_THREAD; 587 } 588 return true; 589} 590 591lldb::thread_result_t 592GDBRemoteCommunication::ListenThread (lldb::thread_arg_t arg) 593{ 594 GDBRemoteCommunication *comm = (GDBRemoteCommunication *)arg; 595 Error error; 596 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)comm->GetConnection (); 597 598 if (connection) 599 { 600 // Do the listen on another thread so we can continue on... 601 if (connection->Connect(comm->m_listen_url.c_str(), &error) != eConnectionStatusSuccess) 602 comm->SetConnection(NULL); 603 } 604 return NULL; 605} 606 607Error 608GDBRemoteCommunication::StartDebugserverProcess (const char *hostname, 609 uint16_t in_port, 610 lldb_private::ProcessLaunchInfo &launch_info, 611 uint16_t &out_port) 612{ 613 out_port = in_port; 614 Error error; 615 // If we locate debugserver, keep that located version around 616 static FileSpec g_debugserver_file_spec; 617 618 char debugserver_path[PATH_MAX]; 619 FileSpec &debugserver_file_spec = launch_info.GetExecutableFile(); 620 621 // Always check to see if we have an environment override for the path 622 // to the debugserver to use and use it if we do. 623 const char *env_debugserver_path = getenv("LLDB_DEBUGSERVER_PATH"); 624 if (env_debugserver_path) 625 debugserver_file_spec.SetFile (env_debugserver_path, false); 626 else 627 debugserver_file_spec = g_debugserver_file_spec; 628 bool debugserver_exists = debugserver_file_spec.Exists(); 629 if (!debugserver_exists) 630 { 631 // The debugserver binary is in the LLDB.framework/Resources 632 // directory. 633 if (Host::GetLLDBPath (ePathTypeSupportExecutableDir, debugserver_file_spec)) 634 { 635 debugserver_file_spec.GetFilename().SetCString(DEBUGSERVER_BASENAME); 636 debugserver_exists = debugserver_file_spec.Exists(); 637 if (debugserver_exists) 638 { 639 g_debugserver_file_spec = debugserver_file_spec; 640 } 641 else 642 { 643 g_debugserver_file_spec.Clear(); 644 debugserver_file_spec.Clear(); 645 } 646 } 647 } 648 649 if (debugserver_exists) 650 { 651 debugserver_file_spec.GetPath (debugserver_path, sizeof(debugserver_path)); 652 653 Args &debugserver_args = launch_info.GetArguments(); 654 debugserver_args.Clear(); 655 char arg_cstr[PATH_MAX]; 656 657 // Start args with "debugserver /file/path -r --" 658 debugserver_args.AppendArgument(debugserver_path); 659 660 // If a host and port is supplied then use it 661 char host_and_port[128]; 662 if (hostname) 663 { 664 snprintf (host_and_port, sizeof(host_and_port), "%s:%u", hostname, in_port); 665 debugserver_args.AppendArgument(host_and_port); 666 } 667 else 668 { 669 host_and_port[0] = '\0'; 670 } 671 672 // use native registers, not the GDB registers 673 debugserver_args.AppendArgument("--native-regs"); 674 // make debugserver run in its own session so signals generated by 675 // special terminal key sequences (^C) don't affect debugserver 676 debugserver_args.AppendArgument("--setsid"); 677 678 char named_pipe_path[PATH_MAX]; 679 named_pipe_path[0] = '\0'; 680 681 bool listen = false; 682 if (host_and_port[0]) 683 { 684 // Create a temporary file to get the stdout/stderr and redirect the 685 // output of the command into this file. We will later read this file 686 // if all goes well and fill the data into "command_output_ptr" 687 688 if (in_port == 0) 689 { 690 // Binding to port zero, we need to figure out what port it ends up 691 // using using a named pipe... 692 FileSpec tmpdir_file_spec; 693 if (Host::GetLLDBPath (ePathTypeLLDBTempSystemDir, tmpdir_file_spec)) 694 { 695 tmpdir_file_spec.GetFilename().SetCString("debugserver-named-pipe.XXXXXX"); 696 strncpy(named_pipe_path, tmpdir_file_spec.GetPath().c_str(), sizeof(named_pipe_path)); 697 } 698 else 699 { 700 strncpy(named_pipe_path, "/tmp/debugserver-named-pipe.XXXXXX", sizeof(named_pipe_path)); 701 } 702 703 if (::mktemp (named_pipe_path)) 704 { 705#if defined(_MSC_VER) 706 if ( false ) 707#else 708 if (::mkfifo(named_pipe_path, 0600) == 0) 709#endif 710 { 711 debugserver_args.AppendArgument("--named-pipe"); 712 debugserver_args.AppendArgument(named_pipe_path); 713 } 714 } 715 } 716 else 717 { 718 listen = true; 719 } 720 } 721 else 722 { 723 // No host and port given, so lets listen on our end and make the debugserver 724 // connect to us.. 725 error = StartListenThread ("localhost", 0); 726 if (error.Fail()) 727 return error; 728 729 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)GetConnection (); 730 out_port = connection->GetBoundPort(3); 731 assert (out_port != 0); 732 char port_cstr[32]; 733 snprintf(port_cstr, sizeof(port_cstr), "localhost:%i", out_port); 734 // Send the host and port down that debugserver and specify an option 735 // so that it connects back to the port we are listening to in this process 736 debugserver_args.AppendArgument("--reverse-connect"); 737 debugserver_args.AppendArgument(port_cstr); 738 } 739 740 741 const char *env_debugserver_log_file = getenv("LLDB_DEBUGSERVER_LOG_FILE"); 742 if (env_debugserver_log_file) 743 { 744 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-file=%s", env_debugserver_log_file); 745 debugserver_args.AppendArgument(arg_cstr); 746 } 747 748 const char *env_debugserver_log_flags = getenv("LLDB_DEBUGSERVER_LOG_FLAGS"); 749 if (env_debugserver_log_flags) 750 { 751 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-flags=%s", env_debugserver_log_flags); 752 debugserver_args.AppendArgument(arg_cstr); 753 } 754 755 // Close STDIN, STDOUT and STDERR. We might need to redirect them 756 // to "/dev/null" if we run into any problems. 757 launch_info.AppendCloseFileAction (STDIN_FILENO); 758 launch_info.AppendCloseFileAction (STDOUT_FILENO); 759 launch_info.AppendCloseFileAction (STDERR_FILENO); 760 761 error = Host::LaunchProcess(launch_info); 762 763 if (named_pipe_path[0]) 764 { 765 File name_pipe_file; 766 error = name_pipe_file.Open(named_pipe_path, File::eOpenOptionRead); 767 if (error.Success()) 768 { 769 char port_cstr[256]; 770 port_cstr[0] = '\0'; 771 size_t num_bytes = sizeof(port_cstr); 772 error = name_pipe_file.Read(port_cstr, num_bytes); 773 assert (error.Success()); 774 assert (num_bytes > 0 && port_cstr[num_bytes-1] == '\0'); 775 out_port = Args::StringToUInt32(port_cstr, 0); 776 name_pipe_file.Close(); 777 } 778 Host::Unlink(named_pipe_path); 779 } 780 else if (listen) 781 { 782 783 } 784 else 785 { 786 // Make sure we actually connect with the debugserver... 787 JoinListenThread(); 788 } 789 } 790 else 791 { 792 error.SetErrorStringWithFormat ("unable to locate " DEBUGSERVER_BASENAME ); 793 } 794 return error; 795} 796 797void 798GDBRemoteCommunication::DumpHistory(Stream &strm) 799{ 800 m_history.Dump (strm); 801} 802