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 34 using namespace lldb; 35 using namespace lldb_private; 36 37 GDBRemoteCommunication::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 46 GDBRemoteCommunication::History::~History () 47 { 48 } 49 50 void 51 GDBRemoteCommunication::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 67 void 68 GDBRemoteCommunication::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 85 void 86 GDBRemoteCommunication::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 } 105 106 void 107 GDBRemoteCommunication::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 //---------------------------------------------------------------------- 134 GDBRemoteCommunication::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 //---------------------------------------------------------------------- 157 GDBRemoteCommunication::~GDBRemoteCommunication() 158 { 159 if (IsConnected()) 160 { 161 Disconnect(); 162 } 163 } 164 165 char 166 GDBRemoteCommunication::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 } 175 176 size_t 177 GDBRemoteCommunication::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 } 188 189 size_t 190 GDBRemoteCommunication::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 } 201 202 GDBRemoteCommunication::PacketResult 203 GDBRemoteCommunication::SendPacket (const char *payload, size_t payload_length) 204 { 205 Mutex::Locker locker(m_sequence_mutex); 206 return SendPacketNoLock (payload, payload_length); 207 } 208 209 GDBRemoteCommunication::PacketResult 210 GDBRemoteCommunication::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 } 254 255 GDBRemoteCommunication::PacketResult 256 GDBRemoteCommunication::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 } 269 270 bool 271 GDBRemoteCommunication::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 } 279 280 281 bool 282 GDBRemoteCommunication::WaitForNotRunningPrivate (const TimeValue *timeout_ptr) 283 { 284 return m_private_is_running.WaitForValueEqualTo (false, timeout_ptr, NULL); 285 } 286 287 GDBRemoteCommunication::PacketResult 288 GDBRemoteCommunication::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 case eConnectionStatusInterrupted: 325 timed_out = true; 326 break; 327 case eConnectionStatusSuccess: 328 //printf ("status = success but error = %s\n", error.AsCString("<invalid>")); 329 break; 330 331 case eConnectionStatusEndOfFile: 332 case eConnectionStatusNoConnection: 333 case eConnectionStatusLostConnection: 334 case eConnectionStatusError: 335 disconnected = true; 336 Disconnect(); 337 break; 338 } 339 } 340 } 341 packet.Clear (); 342 if (disconnected) 343 return PacketResult::ErrorDisconnected; 344 if (timed_out) 345 return PacketResult::ErrorReplyTimeout; 346 else 347 return PacketResult::ErrorReplyFailed; 348 } 349 350 bool 351 GDBRemoteCommunication::CheckForPacket (const uint8_t *src, size_t src_len, StringExtractorGDBRemote &packet) 352 { 353 // Put the packet data into the buffer in a thread safe fashion 354 Mutex::Locker locker(m_bytes_mutex); 355 356 Log *log (ProcessGDBRemoteLog::GetLogIfAllCategoriesSet (GDBR_LOG_PACKETS)); 357 358 if (src && src_len > 0) 359 { 360 if (log && log->GetVerbose()) 361 { 362 StreamString s; 363 log->Printf ("GDBRemoteCommunication::%s adding %u bytes: %.*s", 364 __FUNCTION__, 365 (uint32_t)src_len, 366 (uint32_t)src_len, 367 src); 368 } 369 m_bytes.append ((const char *)src, src_len); 370 } 371 372 // Parse up the packets into gdb remote packets 373 if (!m_bytes.empty()) 374 { 375 // end_idx must be one past the last valid packet byte. Start 376 // it off with an invalid value that is the same as the current 377 // index. 378 size_t content_start = 0; 379 size_t content_length = 0; 380 size_t total_length = 0; 381 size_t checksum_idx = std::string::npos; 382 383 switch (m_bytes[0]) 384 { 385 case '+': // Look for ack 386 case '-': // Look for cancel 387 case '\x03': // ^C to halt target 388 content_length = total_length = 1; // The command is one byte long... 389 break; 390 391 case '$': 392 // Look for a standard gdb packet? 393 { 394 size_t hash_pos = m_bytes.find('#'); 395 if (hash_pos != std::string::npos) 396 { 397 if (hash_pos + 2 < m_bytes.size()) 398 { 399 checksum_idx = hash_pos + 1; 400 // Skip the dollar sign 401 content_start = 1; 402 // Don't include the # in the content or the $ in the content length 403 content_length = hash_pos - 1; 404 405 total_length = hash_pos + 3; // Skip the # and the two hex checksum bytes 406 } 407 else 408 { 409 // Checksum bytes aren't all here yet 410 content_length = std::string::npos; 411 } 412 } 413 } 414 break; 415 416 default: 417 { 418 // We have an unexpected byte and we need to flush all bad 419 // data that is in m_bytes, so we need to find the first 420 // byte that is a '+' (ACK), '-' (NACK), \x03 (CTRL+C interrupt), 421 // or '$' character (start of packet header) or of course, 422 // the end of the data in m_bytes... 423 const size_t bytes_len = m_bytes.size(); 424 bool done = false; 425 uint32_t idx; 426 for (idx = 1; !done && idx < bytes_len; ++idx) 427 { 428 switch (m_bytes[idx]) 429 { 430 case '+': 431 case '-': 432 case '\x03': 433 case '$': 434 done = true; 435 break; 436 437 default: 438 break; 439 } 440 } 441 if (log) 442 log->Printf ("GDBRemoteCommunication::%s tossing %u junk bytes: '%.*s'", 443 __FUNCTION__, idx, idx, m_bytes.c_str()); 444 m_bytes.erase(0, idx); 445 } 446 break; 447 } 448 449 if (content_length == std::string::npos) 450 { 451 packet.Clear(); 452 return false; 453 } 454 else if (total_length > 0) 455 { 456 457 // We have a valid packet... 458 assert (content_length <= m_bytes.size()); 459 assert (total_length <= m_bytes.size()); 460 assert (content_length <= total_length); 461 const size_t content_end = content_start + content_length; 462 463 bool success = true; 464 std::string &packet_str = packet.GetStringRef(); 465 466 467 if (log) 468 { 469 // If logging was just enabled and we have history, then dump out what 470 // we have to the log so we get the historical context. The Dump() call that 471 // logs all of the packet will set a boolean so that we don't dump this more 472 // than once 473 if (!m_history.DidDumpToLog ()) 474 m_history.Dump (log); 475 476 bool binary = false; 477 // Only detect binary for packets that start with a '$' and have a '#CC' checksum 478 if (m_bytes[0] == '$' && total_length > 4) 479 { 480 for (size_t i=0; !binary && i<total_length; ++i) 481 { 482 if (isprint(m_bytes[i]) == 0) 483 binary = true; 484 } 485 } 486 if (binary) 487 { 488 StreamString strm; 489 // Packet header... 490 strm.Printf("<%4" PRIu64 "> read packet: %c", (uint64_t)total_length, m_bytes[0]); 491 for (size_t i=content_start; i<content_end; ++i) 492 { 493 // Remove binary escaped bytes when displaying the packet... 494 const char ch = m_bytes[i]; 495 if (ch == 0x7d) 496 { 497 // 0x7d is the escape character. The next character is to 498 // be XOR'd with 0x20. 499 const char escapee = m_bytes[++i] ^ 0x20; 500 strm.Printf("%2.2x", escapee); 501 } 502 else 503 { 504 strm.Printf("%2.2x", (uint8_t)ch); 505 } 506 } 507 // Packet footer... 508 strm.Printf("%c%c%c", m_bytes[total_length-3], m_bytes[total_length-2], m_bytes[total_length-1]); 509 log->PutCString(strm.GetString().c_str()); 510 } 511 else 512 { 513 log->Printf("<%4" PRIu64 "> read packet: %.*s", (uint64_t)total_length, (int)(total_length), m_bytes.c_str()); 514 } 515 } 516 517 m_history.AddPacket (m_bytes.c_str(), total_length, History::ePacketTypeRecv, total_length); 518 519 // Clear packet_str in case there is some existing data in it. 520 packet_str.clear(); 521 // Copy the packet from m_bytes to packet_str expanding the 522 // run-length encoding in the process. 523 // Reserve enough byte for the most common case (no RLE used) 524 packet_str.reserve(m_bytes.length()); 525 for (std::string::const_iterator c = m_bytes.begin() + content_start; c != m_bytes.begin() + content_end; ++c) 526 { 527 if (*c == '*') 528 { 529 // '*' indicates RLE. Next character will give us the 530 // repeat count and previous character is what is to be 531 // repeated. 532 char char_to_repeat = packet_str.back(); 533 // Number of time the previous character is repeated 534 int repeat_count = *++c + 3 - ' '; 535 // We have the char_to_repeat and repeat_count. Now push 536 // it in the packet. 537 for (int i = 0; i < repeat_count; ++i) 538 packet_str.push_back(char_to_repeat); 539 } 540 else if (*c == 0x7d) 541 { 542 // 0x7d is the escape character. The next character is to 543 // be XOR'd with 0x20. 544 char escapee = *++c ^ 0x20; 545 packet_str.push_back(escapee); 546 } 547 else 548 { 549 packet_str.push_back(*c); 550 } 551 } 552 553 if (m_bytes[0] == '$') 554 { 555 assert (checksum_idx < m_bytes.size()); 556 if (::isxdigit (m_bytes[checksum_idx+0]) || 557 ::isxdigit (m_bytes[checksum_idx+1])) 558 { 559 if (GetSendAcks ()) 560 { 561 const char *packet_checksum_cstr = &m_bytes[checksum_idx]; 562 char packet_checksum = strtol (packet_checksum_cstr, NULL, 16); 563 char actual_checksum = CalculcateChecksum (packet_str.c_str(), packet_str.size()); 564 success = packet_checksum == actual_checksum; 565 if (!success) 566 { 567 if (log) 568 log->Printf ("error: checksum mismatch: %.*s expected 0x%2.2x, got 0x%2.2x", 569 (int)(total_length), 570 m_bytes.c_str(), 571 (uint8_t)packet_checksum, 572 (uint8_t)actual_checksum); 573 } 574 // Send the ack or nack if needed 575 if (!success) 576 SendNack(); 577 else 578 SendAck(); 579 } 580 } 581 else 582 { 583 success = false; 584 if (log) 585 log->Printf ("error: invalid checksum in packet: '%s'\n", m_bytes.c_str()); 586 } 587 } 588 589 m_bytes.erase(0, total_length); 590 packet.SetFilePos(0); 591 return success; 592 } 593 } 594 packet.Clear(); 595 return false; 596 } 597 598 Error 599 GDBRemoteCommunication::StartListenThread (const char *hostname, uint16_t port) 600 { 601 Error error; 602 if (IS_VALID_LLDB_HOST_THREAD(m_listen_thread)) 603 { 604 error.SetErrorString("listen thread already running"); 605 } 606 else 607 { 608 char listen_url[512]; 609 if (hostname && hostname[0]) 610 snprintf(listen_url, sizeof(listen_url), "listen://%s:%i", hostname, port); 611 else 612 snprintf(listen_url, sizeof(listen_url), "listen://%i", port); 613 m_listen_url = listen_url; 614 SetConnection(new ConnectionFileDescriptor()); 615 m_listen_thread = Host::ThreadCreate (listen_url, GDBRemoteCommunication::ListenThread, this, &error); 616 } 617 return error; 618 } 619 620 bool 621 GDBRemoteCommunication::JoinListenThread () 622 { 623 if (IS_VALID_LLDB_HOST_THREAD(m_listen_thread)) 624 { 625 Host::ThreadJoin(m_listen_thread, NULL, NULL); 626 m_listen_thread = LLDB_INVALID_HOST_THREAD; 627 } 628 return true; 629 } 630 631 lldb::thread_result_t 632 GDBRemoteCommunication::ListenThread (lldb::thread_arg_t arg) 633 { 634 GDBRemoteCommunication *comm = (GDBRemoteCommunication *)arg; 635 Error error; 636 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)comm->GetConnection (); 637 638 if (connection) 639 { 640 // Do the listen on another thread so we can continue on... 641 if (connection->Connect(comm->m_listen_url.c_str(), &error) != eConnectionStatusSuccess) 642 comm->SetConnection(NULL); 643 } 644 return NULL; 645 } 646 647 Error 648 GDBRemoteCommunication::StartDebugserverProcess (const char *hostname, 649 uint16_t in_port, 650 lldb_private::ProcessLaunchInfo &launch_info, 651 uint16_t &out_port) 652 { 653 out_port = in_port; 654 Error error; 655 // If we locate debugserver, keep that located version around 656 static FileSpec g_debugserver_file_spec; 657 658 char debugserver_path[PATH_MAX]; 659 FileSpec &debugserver_file_spec = launch_info.GetExecutableFile(); 660 661 // Always check to see if we have an environment override for the path 662 // to the debugserver to use and use it if we do. 663 const char *env_debugserver_path = getenv("LLDB_DEBUGSERVER_PATH"); 664 if (env_debugserver_path) 665 debugserver_file_spec.SetFile (env_debugserver_path, false); 666 else 667 debugserver_file_spec = g_debugserver_file_spec; 668 bool debugserver_exists = debugserver_file_spec.Exists(); 669 if (!debugserver_exists) 670 { 671 // The debugserver binary is in the LLDB.framework/Resources 672 // directory. 673 if (Host::GetLLDBPath (ePathTypeSupportExecutableDir, debugserver_file_spec)) 674 { 675 debugserver_file_spec.GetFilename().SetCString(DEBUGSERVER_BASENAME); 676 debugserver_exists = debugserver_file_spec.Exists(); 677 if (debugserver_exists) 678 { 679 g_debugserver_file_spec = debugserver_file_spec; 680 } 681 else 682 { 683 g_debugserver_file_spec.Clear(); 684 debugserver_file_spec.Clear(); 685 } 686 } 687 } 688 689 if (debugserver_exists) 690 { 691 debugserver_file_spec.GetPath (debugserver_path, sizeof(debugserver_path)); 692 693 Args &debugserver_args = launch_info.GetArguments(); 694 debugserver_args.Clear(); 695 char arg_cstr[PATH_MAX]; 696 697 // Start args with "debugserver /file/path -r --" 698 debugserver_args.AppendArgument(debugserver_path); 699 700 // If a host and port is supplied then use it 701 char host_and_port[128]; 702 if (hostname) 703 { 704 snprintf (host_and_port, sizeof(host_and_port), "%s:%u", hostname, in_port); 705 debugserver_args.AppendArgument(host_and_port); 706 } 707 else 708 { 709 host_and_port[0] = '\0'; 710 } 711 712 // use native registers, not the GDB registers 713 debugserver_args.AppendArgument("--native-regs"); 714 // make debugserver run in its own session so signals generated by 715 // special terminal key sequences (^C) don't affect debugserver 716 debugserver_args.AppendArgument("--setsid"); 717 718 char named_pipe_path[PATH_MAX]; 719 named_pipe_path[0] = '\0'; 720 721 bool listen = false; 722 if (host_and_port[0]) 723 { 724 // Create a temporary file to get the stdout/stderr and redirect the 725 // output of the command into this file. We will later read this file 726 // if all goes well and fill the data into "command_output_ptr" 727 728 if (in_port == 0) 729 { 730 // Binding to port zero, we need to figure out what port it ends up 731 // using using a named pipe... 732 FileSpec tmpdir_file_spec; 733 if (Host::GetLLDBPath (ePathTypeLLDBTempSystemDir, tmpdir_file_spec)) 734 { 735 tmpdir_file_spec.GetFilename().SetCString("debugserver-named-pipe.XXXXXX"); 736 strncpy(named_pipe_path, tmpdir_file_spec.GetPath().c_str(), sizeof(named_pipe_path)); 737 } 738 else 739 { 740 strncpy(named_pipe_path, "/tmp/debugserver-named-pipe.XXXXXX", sizeof(named_pipe_path)); 741 } 742 743 if (::mktemp (named_pipe_path)) 744 { 745 #if defined(_WIN32) 746 if ( false ) 747 #else 748 if (::mkfifo(named_pipe_path, 0600) == 0) 749 #endif 750 { 751 debugserver_args.AppendArgument("--named-pipe"); 752 debugserver_args.AppendArgument(named_pipe_path); 753 } 754 } 755 } 756 else 757 { 758 listen = true; 759 } 760 } 761 else 762 { 763 // No host and port given, so lets listen on our end and make the debugserver 764 // connect to us.. 765 error = StartListenThread ("127.0.0.1", 0); 766 if (error.Fail()) 767 return error; 768 769 ConnectionFileDescriptor *connection = (ConnectionFileDescriptor *)GetConnection (); 770 // Wait for 10 seconds to resolve the bound port 771 out_port = connection->GetBoundPort(10); 772 if (out_port > 0) 773 { 774 char port_cstr[32]; 775 snprintf(port_cstr, sizeof(port_cstr), "127.0.0.1:%i", out_port); 776 // Send the host and port down that debugserver and specify an option 777 // so that it connects back to the port we are listening to in this process 778 debugserver_args.AppendArgument("--reverse-connect"); 779 debugserver_args.AppendArgument(port_cstr); 780 } 781 else 782 { 783 error.SetErrorString ("failed to bind to port 0 on 127.0.0.1"); 784 return error; 785 } 786 } 787 788 789 const char *env_debugserver_log_file = getenv("LLDB_DEBUGSERVER_LOG_FILE"); 790 if (env_debugserver_log_file) 791 { 792 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-file=%s", env_debugserver_log_file); 793 debugserver_args.AppendArgument(arg_cstr); 794 } 795 796 const char *env_debugserver_log_flags = getenv("LLDB_DEBUGSERVER_LOG_FLAGS"); 797 if (env_debugserver_log_flags) 798 { 799 ::snprintf (arg_cstr, sizeof(arg_cstr), "--log-flags=%s", env_debugserver_log_flags); 800 debugserver_args.AppendArgument(arg_cstr); 801 } 802 803 // Close STDIN, STDOUT and STDERR. We might need to redirect them 804 // to "/dev/null" if we run into any problems. 805 launch_info.AppendCloseFileAction (STDIN_FILENO); 806 launch_info.AppendCloseFileAction (STDOUT_FILENO); 807 launch_info.AppendCloseFileAction (STDERR_FILENO); 808 809 error = Host::LaunchProcess(launch_info); 810 811 if (error.Success() && launch_info.GetProcessID() != LLDB_INVALID_PROCESS_ID) 812 { 813 if (named_pipe_path[0]) 814 { 815 File name_pipe_file; 816 error = name_pipe_file.Open(named_pipe_path, File::eOpenOptionRead); 817 if (error.Success()) 818 { 819 char port_cstr[256]; 820 port_cstr[0] = '\0'; 821 size_t num_bytes = sizeof(port_cstr); 822 error = name_pipe_file.Read(port_cstr, num_bytes); 823 assert (error.Success()); 824 assert (num_bytes > 0 && port_cstr[num_bytes-1] == '\0'); 825 out_port = Args::StringToUInt32(port_cstr, 0); 826 name_pipe_file.Close(); 827 } 828 Host::Unlink(named_pipe_path); 829 } 830 else if (listen) 831 { 832 833 } 834 else 835 { 836 // Make sure we actually connect with the debugserver... 837 JoinListenThread(); 838 } 839 } 840 } 841 else 842 { 843 error.SetErrorStringWithFormat ("unable to locate " DEBUGSERVER_BASENAME ); 844 } 845 return error; 846 } 847 848 void 849 GDBRemoteCommunication::DumpHistory(Stream &strm) 850 { 851 m_history.Dump (strm); 852 } 853