contrib/llvm/tools/lldb/source/Plugins/Platform/gdb-server/PlatformRemoteGDBServer.cpp

   1 //===-- PlatformRemoteGDBServer.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 #include "PlatformRemoteGDBServer.h"
  11 #include "lldb/Host/Config.h"
  12
  13 // C++ Includes
  14 // Other libraries and framework includes
  15 // Project includes
  16 #include "lldb/Breakpoint/BreakpointLocation.h"
  17 #include "lldb/Core/Debugger.h"
  18 #include "lldb/Core/Module.h"
  19 #include "lldb/Core/ModuleList.h"
  20 #include "lldb/Core/ModuleSpec.h"
  21 #include "lldb/Core/PluginManager.h"
  22 #include "lldb/Core/StreamFile.h"
  23 #include "lldb/Host/ConnectionFileDescriptor.h"
  24 #include "lldb/Host/Host.h"
  25 #include "lldb/Host/HostInfo.h"
  26 #include "lldb/Host/PosixApi.h"
  27 #include "lldb/Target/Process.h"
  28 #include "lldb/Target/Target.h"
  29 #include "lldb/Utility/FileSpec.h"
  30 #include "lldb/Utility/Log.h"
  31 #include "lldb/Utility/Status.h"
  32 #include "lldb/Utility/StreamString.h"
  33 #include "lldb/Utility/UriParser.h"
  34
  35 #include "Plugins/Process/Utility/GDBRemoteSignals.h"
  36
  37 using namespace lldb;
  38 using namespace lldb_private;
  39 using namespace lldb_private::platform_gdb_server;
  40
  41 static bool g_initialized = false;
  42
  43 void PlatformRemoteGDBServer::Initialize() {
  44   Platform::Initialize();
  45
  46   if (g_initialized == false) {
  47     g_initialized = true;
  48     PluginManager::RegisterPlugin(
  49         PlatformRemoteGDBServer::GetPluginNameStatic(),
  50         PlatformRemoteGDBServer::GetDescriptionStatic(),
  51         PlatformRemoteGDBServer::CreateInstance);
  52   }
  53 }
  54
  55 void PlatformRemoteGDBServer::Terminate() {
  56   if (g_initialized) {
  57     g_initialized = false;
  58     PluginManager::UnregisterPlugin(PlatformRemoteGDBServer::CreateInstance);
  59   }
  60
  61   Platform::Terminate();
  62 }
  63
  64 PlatformSP PlatformRemoteGDBServer::CreateInstance(bool force,
  65                                                    const ArchSpec *arch) {
  66   bool create = force;
  67   if (!create) {
  68     create = !arch->TripleVendorWasSpecified() && !arch->TripleOSWasSpecified();
  69   }
  70   if (create)
  71     return PlatformSP(new PlatformRemoteGDBServer());
  72   return PlatformSP();
  73 }
  74
  75 ConstString PlatformRemoteGDBServer::GetPluginNameStatic() {
  76   static ConstString g_name("remote-gdb-server");
  77   return g_name;
  78 }
  79
  80 const char *PlatformRemoteGDBServer::GetDescriptionStatic() {
  81   return "A platform that uses the GDB remote protocol as the communication "
  82          "transport.";
  83 }
  84
  85 const char *PlatformRemoteGDBServer::GetDescription() {
  86   if (m_platform_description.empty()) {
  87     if (IsConnected()) {
  88       // Send the get description packet
  89     }
  90   }
  91
  92   if (!m_platform_description.empty())
  93     return m_platform_description.c_str();
  94   return GetDescriptionStatic();
  95 }
  96
  97 Status PlatformRemoteGDBServer::ResolveExecutable(
  98     const ModuleSpec &module_spec, lldb::ModuleSP &exe_module_sp,
  99     const FileSpecList *module_search_paths_ptr) {
 100   // copied from PlatformRemoteiOS
 101
 102   Status error;
 103   // Nothing special to do here, just use the actual file and architecture
 104
 105   ModuleSpec resolved_module_spec(module_spec);
 106
 107   // Resolve any executable within an apk on Android?
 108   // Host::ResolveExecutableInBundle (resolved_module_spec.GetFileSpec());
 109
 110   if (resolved_module_spec.GetFileSpec().Exists() ||
 111       module_spec.GetUUID().IsValid()) {
 112     if (resolved_module_spec.GetArchitecture().IsValid() ||
 113         resolved_module_spec.GetUUID().IsValid()) {
 114       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 115                                           module_search_paths_ptr, NULL, NULL);
 116
 117       if (exe_module_sp && exe_module_sp->GetObjectFile())
 118         return error;
 119       exe_module_sp.reset();
 120     }
 121     // No valid architecture was specified or the exact arch wasn't found so
 122     // ask the platform for the architectures that we should be using (in the
 123     // correct order) and see if we can find a match that way
 124     StreamString arch_names;
 125     for (uint32_t idx = 0; GetSupportedArchitectureAtIndex(
 126              idx, resolved_module_spec.GetArchitecture());
 127          ++idx) {
 128       error = ModuleList::GetSharedModule(resolved_module_spec, exe_module_sp,
 129                                           module_search_paths_ptr, NULL, NULL);
 130       // Did we find an executable using one of the
 131       if (error.Success()) {
 132         if (exe_module_sp && exe_module_sp->GetObjectFile())
 133           break;
 134         else
 135           error.SetErrorToGenericError();
 136       }
 137
 138       if (idx > 0)
 139         arch_names.PutCString(", ");
 140       arch_names.PutCString(
 141           resolved_module_spec.GetArchitecture().GetArchitectureName());
 142     }
 143
 144     if (error.Fail() || !exe_module_sp) {
 145       if (resolved_module_spec.GetFileSpec().Readable()) {
 146         error.SetErrorStringWithFormat(
 147             "'%s' doesn't contain any '%s' platform architectures: %s",
 148             resolved_module_spec.GetFileSpec().GetPath().c_str(),
 149             GetPluginName().GetCString(), arch_names.GetData());
 150       } else {
 151         error.SetErrorStringWithFormat(
 152             "'%s' is not readable",
 153             resolved_module_spec.GetFileSpec().GetPath().c_str());
 154       }
 155     }
 156   } else {
 157     error.SetErrorStringWithFormat(
 158         "'%s' does not exist",
 159         resolved_module_spec.GetFileSpec().GetPath().c_str());
 160   }
 161
 162   return error;
 163 }
 164
 165 bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,
 166                                             const ArchSpec &arch,
 167                                             ModuleSpec &module_spec) {
 168   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 169
 170   const auto module_path = module_file_spec.GetPath(false);
 171
 172   if (!m_gdb_client.GetModuleInfo(module_file_spec, arch, module_spec)) {
 173     if (log)
 174       log->Printf(
 175           "PlatformRemoteGDBServer::%s - failed to get module info for %s:%s",
 176           __FUNCTION__, module_path.c_str(),
 177           arch.GetTriple().getTriple().c_str());
 178     return false;
 179   }
 180
 181   if (log) {
 182     StreamString stream;
 183     module_spec.Dump(stream);
 184     log->Printf(
 185         "PlatformRemoteGDBServer::%s - got module info for (%s:%s) : %s",
 186         __FUNCTION__, module_path.c_str(), arch.GetTriple().getTriple().c_str(),
 187         stream.GetData());
 188   }
 189
 190   return true;
 191 }
 192
 193 Status PlatformRemoteGDBServer::GetFileWithUUID(const FileSpec &platform_file,
 194                                                 const UUID *uuid_ptr,
 195                                                 FileSpec &local_file) {
 196   // Default to the local case
 197   local_file = platform_file;
 198   return Status();
 199 }
 200
 201 //------------------------------------------------------------------
 202 /// Default Constructor
 203 //------------------------------------------------------------------
 204 PlatformRemoteGDBServer::PlatformRemoteGDBServer()
 205     : Platform(false), // This is a remote platform
 206       m_gdb_client() {}
 207
 208 //------------------------------------------------------------------
 209 /// Destructor.
 210 ///
 211 /// The destructor is virtual since this class is designed to be
 212 /// inherited from by the plug-in instance.
 213 //------------------------------------------------------------------
 214 PlatformRemoteGDBServer::~PlatformRemoteGDBServer() {}
 215
 216 bool PlatformRemoteGDBServer::GetSupportedArchitectureAtIndex(uint32_t idx,
 217                                                               ArchSpec &arch) {
 218   ArchSpec remote_arch = m_gdb_client.GetSystemArchitecture();
 219
 220   if (idx == 0) {
 221     arch = remote_arch;
 222     return arch.IsValid();
 223   } else if (idx == 1 && remote_arch.IsValid() &&
 224              remote_arch.GetTriple().isArch64Bit()) {
 225     arch.SetTriple(remote_arch.GetTriple().get32BitArchVariant());
 226     return arch.IsValid();
 227   }
 228   return false;
 229 }
 230
 231 size_t PlatformRemoteGDBServer::GetSoftwareBreakpointTrapOpcode(
 232     Target &target, BreakpointSite *bp_site) {
 233   // This isn't needed if the z/Z packets are supported in the GDB remote
 234   // server. But we might need a packet to detect this.
 235   return 0;
 236 }
 237
 238 bool PlatformRemoteGDBServer::GetRemoteOSVersion() {
 239   m_os_version = m_gdb_client.GetOSVersion();
 240   return !m_os_version.empty();
 241 }
 242
 243 bool PlatformRemoteGDBServer::GetRemoteOSBuildString(std::string &s) {
 244   return m_gdb_client.GetOSBuildString(s);
 245 }
 246
 247 bool PlatformRemoteGDBServer::GetRemoteOSKernelDescription(std::string &s) {
 248   return m_gdb_client.GetOSKernelDescription(s);
 249 }
 250
 251 // Remote Platform subclasses need to override this function
 252 ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {
 253   return m_gdb_client.GetSystemArchitecture();
 254 }
 255
 256 FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {
 257   if (IsConnected()) {
 258     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 259     FileSpec working_dir;
 260     if (m_gdb_client.GetWorkingDir(working_dir) && log)
 261       log->Printf(
 262           "PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",
 263           working_dir.GetCString());
 264     return working_dir;
 265   } else {
 266     return Platform::GetRemoteWorkingDirectory();
 267   }
 268 }
 269
 270 bool PlatformRemoteGDBServer::SetRemoteWorkingDirectory(
 271     const FileSpec &working_dir) {
 272   if (IsConnected()) {
 273     // Clear the working directory it case it doesn't get set correctly. This
 274     // will for use to re-read it
 275     Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 276     if (log)
 277       log->Printf("PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",
 278                   working_dir.GetCString());
 279     return m_gdb_client.SetWorkingDir(working_dir) == 0;
 280   } else
 281     return Platform::SetRemoteWorkingDirectory(working_dir);
 282 }
 283
 284 bool PlatformRemoteGDBServer::IsConnected() const {
 285   return m_gdb_client.IsConnected();
 286 }
 287
 288 Status PlatformRemoteGDBServer::ConnectRemote(Args &args) {
 289   Status error;
 290   if (IsConnected()) {
 291     error.SetErrorStringWithFormat("the platform is already connected to '%s', "
 292                                    "execute 'platform disconnect' to close the "
 293                                    "current connection",
 294                                    GetHostname());
 295   } else {
 296     if (args.GetArgumentCount() == 1) {
 297       m_gdb_client.SetConnection(new ConnectionFileDescriptor());
 298       // we're going to reuse the hostname when we connect to the debugserver
 299       int port;
 300       std::string path;
 301       const char *url = args.GetArgumentAtIndex(0);
 302       if (!url)
 303         return Status("URL is null.");
 304       llvm::StringRef scheme, hostname, pathname;
 305       if (!UriParser::Parse(url, scheme, hostname, port, pathname))
 306         return Status("Invalid URL: %s", url);
 307       m_platform_scheme = scheme;
 308       m_platform_hostname = hostname;
 309       path = pathname;
 310
 311       const ConnectionStatus status = m_gdb_client.Connect(url, &error);
 312       if (status == eConnectionStatusSuccess) {
 313         if (m_gdb_client.HandshakeWithServer(&error)) {
 314           m_gdb_client.GetHostInfo();
 315           // If a working directory was set prior to connecting, send it down
 316           // now
 317           if (m_working_dir)
 318             m_gdb_client.SetWorkingDir(m_working_dir);
 319         } else {
 320           m_gdb_client.Disconnect();
 321           if (error.Success())
 322             error.SetErrorString("handshake failed");
 323         }
 324       }
 325     } else {
 326       error.SetErrorString(
 327           "\"platform connect\" takes a single argument: <connect-url>");
 328     }
 329   }
 330   return error;
 331 }
 332
 333 Status PlatformRemoteGDBServer::DisconnectRemote() {
 334   Status error;
 335   m_gdb_client.Disconnect(&error);
 336   m_remote_signals_sp.reset();
 337   return error;
 338 }
 339
 340 const char *PlatformRemoteGDBServer::GetHostname() {
 341   m_gdb_client.GetHostname(m_name);
 342   if (m_name.empty())
 343     return NULL;
 344   return m_name.c_str();
 345 }
 346
 347 const char *PlatformRemoteGDBServer::GetUserName(uint32_t uid) {
 348   // Try and get a cache user name first
 349   const char *cached_user_name = Platform::GetUserName(uid);
 350   if (cached_user_name)
 351     return cached_user_name;
 352   std::string name;
 353   if (m_gdb_client.GetUserName(uid, name))
 354     return SetCachedUserName(uid, name.c_str(), name.size());
 355
 356   SetUserNameNotFound(uid); // Negative cache so we don't keep sending packets
 357   return NULL;
 358 }
 359
 360 const char *PlatformRemoteGDBServer::GetGroupName(uint32_t gid) {
 361   const char *cached_group_name = Platform::GetGroupName(gid);
 362   if (cached_group_name)
 363     return cached_group_name;
 364   std::string name;
 365   if (m_gdb_client.GetGroupName(gid, name))
 366     return SetCachedGroupName(gid, name.c_str(), name.size());
 367
 368   SetGroupNameNotFound(gid); // Negative cache so we don't keep sending packets
 369   return NULL;
 370 }
 371
 372 uint32_t PlatformRemoteGDBServer::FindProcesses(
 373     const ProcessInstanceInfoMatch &match_info,
 374     ProcessInstanceInfoList &process_infos) {
 375   return m_gdb_client.FindProcesses(match_info, process_infos);
 376 }
 377
 378 bool PlatformRemoteGDBServer::GetProcessInfo(
 379     lldb::pid_t pid, ProcessInstanceInfo &process_info) {
 380   return m_gdb_client.GetProcessInfo(pid, process_info);
 381 }
 382
 383 Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {
 384   Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_PLATFORM));
 385   Status error;
 386
 387   if (log)
 388     log->Printf("PlatformRemoteGDBServer::%s() called", __FUNCTION__);
 389
 390   auto num_file_actions = launch_info.GetNumFileActions();
 391   for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) {
 392     const auto file_action = launch_info.GetFileActionAtIndex(i);
 393     if (file_action->GetAction() != FileAction::eFileActionOpen)
 394       continue;
 395     switch (file_action->GetFD()) {
 396     case STDIN_FILENO:
 397       m_gdb_client.SetSTDIN(file_action->GetFileSpec());
 398       break;
 399     case STDOUT_FILENO:
 400       m_gdb_client.SetSTDOUT(file_action->GetFileSpec());
 401       break;
 402     case STDERR_FILENO:
 403       m_gdb_client.SetSTDERR(file_action->GetFileSpec());
 404       break;
 405     }
 406   }
 407
 408   m_gdb_client.SetDisableASLR(
 409       launch_info.GetFlags().Test(eLaunchFlagDisableASLR));
 410   m_gdb_client.SetDetachOnError(
 411       launch_info.GetFlags().Test(eLaunchFlagDetachOnError));
 412
 413   FileSpec working_dir = launch_info.GetWorkingDirectory();
 414   if (working_dir) {
 415     m_gdb_client.SetWorkingDir(working_dir);
 416   }
 417
 418   // Send the environment and the program + arguments after we connect
 419   m_gdb_client.SendEnvironment(launch_info.GetEnvironment());
 420
 421   ArchSpec arch_spec = launch_info.GetArchitecture();
 422   const char *arch_triple = arch_spec.GetTriple().str().c_str();
 423
 424   m_gdb_client.SendLaunchArchPacket(arch_triple);
 425   if (log)
 426     log->Printf(
 427         "PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",
 428         __FUNCTION__, arch_triple ? arch_triple : "<NULL>");
 429
 430   int arg_packet_err;
 431   {
 432     // Scope for the scoped timeout object
 433     process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(
 434         m_gdb_client, std::chrono::seconds(5));
 435     arg_packet_err = m_gdb_client.SendArgumentsPacket(launch_info);
 436   }
 437
 438   if (arg_packet_err == 0) {
 439     std::string error_str;
 440     if (m_gdb_client.GetLaunchSuccess(error_str)) {
 441       const auto pid = m_gdb_client.GetCurrentProcessID(false);
 442       if (pid != LLDB_INVALID_PROCESS_ID) {
 443         launch_info.SetProcessID(pid);
 444         if (log)
 445           log->Printf("PlatformRemoteGDBServer::%s() pid %" PRIu64
 446                       " launched successfully",
 447                       __FUNCTION__, pid);
 448       } else {
 449         if (log)
 450           log->Printf("PlatformRemoteGDBServer::%s() launch succeeded but we "
 451                       "didn't get a valid process id back!",
 452                       __FUNCTION__);
 453         error.SetErrorString("failed to get PID");
 454       }
 455     } else {
 456       error.SetErrorString(error_str.c_str());
 457       if (log)
 458         log->Printf("PlatformRemoteGDBServer::%s() launch failed: %s",
 459                     __FUNCTION__, error.AsCString());
 460     }
 461   } else {
 462     error.SetErrorStringWithFormat("'A' packet returned an error: %i",
 463                                    arg_packet_err);
 464   }
 465   return error;
 466 }
 467
 468 Status PlatformRemoteGDBServer::KillProcess(const lldb::pid_t pid) {
 469   if (!KillSpawnedProcess(pid))
 470     return Status("failed to kill remote spawned process");
 471   return Status();
 472 }
 473
 474 lldb::ProcessSP PlatformRemoteGDBServer::DebugProcess(
 475     ProcessLaunchInfo &launch_info, Debugger &debugger,
 476     Target *target, // Can be NULL, if NULL create a new target, else use
 477                     // existing one
 478     Status &error) {
 479   lldb::ProcessSP process_sp;
 480   if (IsRemote()) {
 481     if (IsConnected()) {
 482       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 483       std::string connect_url;
 484       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 485         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 486                                        GetHostname());
 487       } else {
 488         if (target == NULL) {
 489           TargetSP new_target_sp;
 490
 491           error = debugger.GetTargetList().CreateTarget(debugger, "", "", false,
 492                                                         NULL, new_target_sp);
 493           target = new_target_sp.get();
 494         } else
 495           error.Clear();
 496
 497         if (target && error.Success()) {
 498           debugger.GetTargetList().SetSelectedTarget(target);
 499
 500           // The darwin always currently uses the GDB remote debugger plug-in
 501           // so even when debugging locally we are debugging remotely!
 502           process_sp = target->CreateProcess(
 503               launch_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
 504
 505           if (process_sp) {
 506             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 507             // Retry the connect remote one time...
 508             if (error.Fail())
 509               error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 510             if (error.Success())
 511               error = process_sp->Launch(launch_info);
 512             else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 513               printf("error: connect remote failed (%s)\n", error.AsCString());
 514               KillSpawnedProcess(debugserver_pid);
 515             }
 516           }
 517         }
 518       }
 519     } else {
 520       error.SetErrorString("not connected to remote gdb server");
 521     }
 522   }
 523   return process_sp;
 524 }
 525
 526 bool PlatformRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,
 527                                               std::string &connect_url) {
 528   ArchSpec remote_arch = GetRemoteSystemArchitecture();
 529   llvm::Triple &remote_triple = remote_arch.GetTriple();
 530
 531   uint16_t port = 0;
 532   std::string socket_name;
 533   bool launch_result = false;
 534   if (remote_triple.getVendor() == llvm::Triple::Apple &&
 535       remote_triple.getOS() == llvm::Triple::IOS) {
 536     // When remote debugging to iOS, we use a USB mux that always talks to
 537     // localhost, so we will need the remote debugserver to accept connections
 538     // only from localhost, no matter what our current hostname is
 539     launch_result =
 540         m_gdb_client.LaunchGDBServer("127.0.0.1", pid, port, socket_name);
 541   } else {
 542     // All other hosts should use their actual hostname
 543     launch_result =
 544         m_gdb_client.LaunchGDBServer(nullptr, pid, port, socket_name);
 545   }
 546
 547   if (!launch_result)
 548     return false;
 549
 550   connect_url =
 551       MakeGdbServerUrl(m_platform_scheme, m_platform_hostname, port,
 552                        (socket_name.empty()) ? nullptr : socket_name.c_str());
 553   return true;
 554 }
 555
 556 bool PlatformRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {
 557   return m_gdb_client.KillSpawnedProcess(pid);
 558 }
 559
 560 lldb::ProcessSP PlatformRemoteGDBServer::Attach(
 561     ProcessAttachInfo &attach_info, Debugger &debugger,
 562     Target *target, // Can be NULL, if NULL create a new target, else use
 563                     // existing one
 564     Status &error) {
 565   lldb::ProcessSP process_sp;
 566   if (IsRemote()) {
 567     if (IsConnected()) {
 568       lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;
 569       std::string connect_url;
 570       if (!LaunchGDBServer(debugserver_pid, connect_url)) {
 571         error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",
 572                                        GetHostname());
 573       } else {
 574         if (target == NULL) {
 575           TargetSP new_target_sp;
 576
 577           error = debugger.GetTargetList().CreateTarget(debugger, "", "", false,
 578                                                         NULL, new_target_sp);
 579           target = new_target_sp.get();
 580         } else
 581           error.Clear();
 582
 583         if (target && error.Success()) {
 584           debugger.GetTargetList().SetSelectedTarget(target);
 585
 586           // The darwin always currently uses the GDB remote debugger plug-in
 587           // so even when debugging locally we are debugging remotely!
 588           process_sp = target->CreateProcess(
 589               attach_info.GetListenerForProcess(debugger), "gdb-remote", NULL);
 590           if (process_sp) {
 591             error = process_sp->ConnectRemote(nullptr, connect_url.c_str());
 592             if (error.Success()) {
 593               ListenerSP listener_sp = attach_info.GetHijackListener();
 594               if (listener_sp)
 595                 process_sp->HijackProcessEvents(listener_sp);
 596               error = process_sp->Attach(attach_info);
 597             }
 598
 599             if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {
 600               KillSpawnedProcess(debugserver_pid);
 601             }
 602           }
 603         }
 604       }
 605     } else {
 606       error.SetErrorString("not connected to remote gdb server");
 607     }
 608   }
 609   return process_sp;
 610 }
 611
 612 Status PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec,
 613                                               uint32_t mode) {
 614   Status error = m_gdb_client.MakeDirectory(file_spec, mode);
 615   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 616   if (log)
 617     log->Printf("PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "
 618                 "error = %u (%s)",
 619                 file_spec.GetCString(), mode, error.GetError(),
 620                 error.AsCString());
 621   return error;
 622 }
 623
 624 Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,
 625                                                    uint32_t &file_permissions) {
 626   Status error = m_gdb_client.GetFilePermissions(file_spec, file_permissions);
 627   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 628   if (log)
 629     log->Printf("PlatformRemoteGDBServer::GetFilePermissions(path='%s', "
 630                 "file_permissions=%o) error = %u (%s)",
 631                 file_spec.GetCString(), file_permissions, error.GetError(),
 632                 error.AsCString());
 633   return error;
 634 }
 635
 636 Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,
 637                                                    uint32_t file_permissions) {
 638   Status error = m_gdb_client.SetFilePermissions(file_spec, file_permissions);
 639   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 640   if (log)
 641     log->Printf("PlatformRemoteGDBServer::SetFilePermissions(path='%s', "
 642                 "file_permissions=%o) error = %u (%s)",
 643                 file_spec.GetCString(), file_permissions, error.GetError(),
 644                 error.AsCString());
 645   return error;
 646 }
 647
 648 lldb::user_id_t PlatformRemoteGDBServer::OpenFile(const FileSpec &file_spec,
 649                                                   uint32_t flags, uint32_t mode,
 650                                                   Status &error) {
 651   return m_gdb_client.OpenFile(file_spec, flags, mode, error);
 652 }
 653
 654 bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {
 655   return m_gdb_client.CloseFile(fd, error);
 656 }
 657
 658 lldb::user_id_t
 659 PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {
 660   return m_gdb_client.GetFileSize(file_spec);
 661 }
 662
 663 uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,
 664                                            void *dst, uint64_t dst_len,
 665                                            Status &error) {
 666   return m_gdb_client.ReadFile(fd, offset, dst, dst_len, error);
 667 }
 668
 669 uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,
 670                                             const void *src, uint64_t src_len,
 671                                             Status &error) {
 672   return m_gdb_client.WriteFile(fd, offset, src, src_len, error);
 673 }
 674
 675 Status PlatformRemoteGDBServer::PutFile(const FileSpec &source,
 676                                         const FileSpec &destination,
 677                                         uint32_t uid, uint32_t gid) {
 678   return Platform::PutFile(source, destination, uid, gid);
 679 }
 680
 681 Status PlatformRemoteGDBServer::CreateSymlink(
 682     const FileSpec &src, // The name of the link is in src
 683     const FileSpec &dst) // The symlink points to dst
 684 {
 685   Status error = m_gdb_client.CreateSymlink(src, dst);
 686   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 687   if (log)
 688     log->Printf("PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "
 689                 "error = %u (%s)",
 690                 src.GetCString(), dst.GetCString(), error.GetError(),
 691                 error.AsCString());
 692   return error;
 693 }
 694
 695 Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {
 696   Status error = m_gdb_client.Unlink(file_spec);
 697   Log *log = GetLogIfAnyCategoriesSet(LIBLLDB_LOG_PLATFORM);
 698   if (log)
 699     log->Printf("PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",
 700                 file_spec.GetCString(), error.GetError(), error.AsCString());
 701   return error;
 702 }
 703
 704 bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {
 705   return m_gdb_client.GetFileExists(file_spec);
 706 }
 707
 708 Status PlatformRemoteGDBServer::RunShellCommand(
 709     const char *command, // Shouldn't be NULL
 710     const FileSpec &
 711         working_dir, // Pass empty FileSpec to use the current working directory
 712     int *status_ptr, // Pass NULL if you don't want the process exit status
 713     int *signo_ptr,  // Pass NULL if you don't want the signal that caused the
 714                      // process to exit
 715     std::string
 716         *command_output, // Pass NULL if you don't want the command output
 717     const Timeout<std::micro> &timeout) {
 718   return m_gdb_client.RunShellCommand(command, working_dir, status_ptr,
 719                                       signo_ptr, command_output, timeout);
 720 }
 721
 722 void PlatformRemoteGDBServer::CalculateTrapHandlerSymbolNames() {
 723   m_trap_handlers.push_back(ConstString("_sigtramp"));
 724 }
 725
 726 const UnixSignalsSP &PlatformRemoteGDBServer::GetRemoteUnixSignals() {
 727   if (!IsConnected())
 728     return Platform::GetRemoteUnixSignals();
 729
 730   if (m_remote_signals_sp)
 731     return m_remote_signals_sp;
 732
 733   // If packet not implemented or JSON failed to parse, we'll guess the signal
 734   // set based on the remote architecture.
 735   m_remote_signals_sp = UnixSignals::Create(GetRemoteSystemArchitecture());
 736
 737   StringExtractorGDBRemote response;
 738   auto result = m_gdb_client.SendPacketAndWaitForResponse("jSignalsInfo",
 739                                                           response, false);
 740
 741   if (result != decltype(result)::Success ||
 742       response.GetResponseType() != response.eResponse)
 743     return m_remote_signals_sp;
 744
 745   auto object_sp = StructuredData::ParseJSON(response.GetStringRef());
 746   if (!object_sp || !object_sp->IsValid())
 747     return m_remote_signals_sp;
 748
 749   auto array_sp = object_sp->GetAsArray();
 750   if (!array_sp || !array_sp->IsValid())
 751     return m_remote_signals_sp;
 752
 753   auto remote_signals_sp = std::make_shared<lldb_private::GDBRemoteSignals>();
 754
 755   bool done = array_sp->ForEach(
 756       [&remote_signals_sp](StructuredData::Object *object) -> bool {
 757         if (!object || !object->IsValid())
 758           return false;
 759
 760         auto dict = object->GetAsDictionary();
 761         if (!dict || !dict->IsValid())
 762           return false;
 763
 764         // Signal number and signal name are required.
 765         int signo;
 766         if (!dict->GetValueForKeyAsInteger("signo", signo))
 767           return false;
 768
 769         llvm::StringRef name;
 770         if (!dict->GetValueForKeyAsString("name", name))
 771           return false;
 772
 773         // We can live without short_name, description, etc.
 774         bool suppress{false};
 775         auto object_sp = dict->GetValueForKey("suppress");
 776         if (object_sp && object_sp->IsValid())
 777           suppress = object_sp->GetBooleanValue();
 778
 779         bool stop{false};
 780         object_sp = dict->GetValueForKey("stop");
 781         if (object_sp && object_sp->IsValid())
 782           stop = object_sp->GetBooleanValue();
 783
 784         bool notify{false};
 785         object_sp = dict->GetValueForKey("notify");
 786         if (object_sp && object_sp->IsValid())
 787           notify = object_sp->GetBooleanValue();
 788
 789         std::string description{""};
 790         object_sp = dict->GetValueForKey("description");
 791         if (object_sp && object_sp->IsValid())
 792           description = object_sp->GetStringValue();
 793
 794         remote_signals_sp->AddSignal(signo, name.str().c_str(), suppress, stop,
 795                                      notify, description.c_str());
 796         return true;
 797       });
 798
 799   if (done)
 800     m_remote_signals_sp = std::move(remote_signals_sp);
 801
 802   return m_remote_signals_sp;
 803 }
 804
 805 std::string PlatformRemoteGDBServer::MakeGdbServerUrl(
 806     const std::string &platform_scheme, const std::string &platform_hostname,
 807     uint16_t port, const char *socket_name) {
 808   const char *override_scheme =
 809       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_SCHEME");
 810   const char *override_hostname =
 811       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_HOSTNAME");
 812   const char *port_offset_c_str =
 813       getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_PORT_OFFSET");
 814   int port_offset = port_offset_c_str ? ::atoi(port_offset_c_str) : 0;
 815
 816   return MakeUrl(override_scheme ? override_scheme : platform_scheme.c_str(),
 817                  override_hostname ? override_hostname
 818                                    : platform_hostname.c_str(),
 819                  port + port_offset, socket_name);
 820 }
 821
 822 std::string PlatformRemoteGDBServer::MakeUrl(const char *scheme,
 823                                              const char *hostname,
 824                                              uint16_t port, const char *path) {
 825   StreamString result;
 826   result.Printf("%s://%s", scheme, hostname);
 827   if (port != 0)
 828     result.Printf(":%u", port);
 829   if (path)
 830     result.Write(path, strlen(path));
 831   return result.GetString();
 832 }
 833
 834 lldb::ProcessSP PlatformRemoteGDBServer::ConnectProcess(
 835     llvm::StringRef connect_url, llvm::StringRef plugin_name,
 836     lldb_private::Debugger &debugger, lldb_private::Target *target,
 837     lldb_private::Status &error) {
 838   if (!IsRemote() || !IsConnected()) {
 839     error.SetErrorString("Not connected to remote gdb server");
 840     return nullptr;
 841   }
 842   return Platform::ConnectProcess(connect_url, plugin_name, debugger, target,
 843                                   error);
 844 }
 845
 846 size_t PlatformRemoteGDBServer::ConnectToWaitingProcesses(Debugger &debugger,
 847                                                           Status &error) {
 848   std::vector<std::string> connection_urls;
 849   GetPendingGdbServerList(connection_urls);
 850
 851   for (size_t i = 0; i < connection_urls.size(); ++i) {
 852     ConnectProcess(connection_urls[i].c_str(), "", debugger, nullptr, error);
 853     if (error.Fail())
 854       return i; // We already connected to i process succsessfully
 855   }
 856   return connection_urls.size();
 857 }
 858
 859 size_t PlatformRemoteGDBServer::GetPendingGdbServerList(
 860     std::vector<std::string> &connection_urls) {
 861   std::vector<std::pair<uint16_t, std::string>> remote_servers;
 862   m_gdb_client.QueryGDBServer(remote_servers);
 863   for (const auto &gdbserver : remote_servers) {
 864     const char *socket_name_cstr =
 865         gdbserver.second.empty() ? nullptr : gdbserver.second.c_str();
 866     connection_urls.emplace_back(
 867         MakeGdbServerUrl(m_platform_scheme, m_platform_hostname,
 868                          gdbserver.first, socket_name_cstr));
 869   }
 870   return connection_urls.size();
 871 }