//===-- PlatformRemoteGDBServer.cpp ---------------------------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "PlatformRemoteGDBServer.h"

#include "lldb/Host/Config.h"

#include "lldb/Breakpoint/BreakpointLocation.h"

#include "lldb/Core/Debugger.h"

#include "lldb/Core/Module.h"

#include "lldb/Core/ModuleList.h"

#include "lldb/Core/ModuleSpec.h"

#include "lldb/Core/PluginManager.h"

#include "lldb/Host/ConnectionFileDescriptor.h"

#include "lldb/Host/Host.h"

#include "lldb/Host/HostInfo.h"

#include "lldb/Host/PosixApi.h"

#include "lldb/Target/Process.h"

#include "lldb/Target/Target.h"

#include "lldb/Utility/FileSpec.h"

#include "lldb/Utility/LLDBLog.h"

#include "lldb/Utility/Log.h"

#include "lldb/Utility/ProcessInfo.h"

#include "lldb/Utility/Status.h"

#include "lldb/Utility/StreamString.h"

#include "lldb/Utility/UriParser.h"

#include "llvm/ADT/StringSet.h"

#include "llvm/Support/FormatAdapters.h"

#include "Plugins/Process/Utility/GDBRemoteSignals.h"

#include "Plugins/Process/gdb-remote/ProcessGDBRemote.h"

#include <mutex>

#include <optional>

using namespace lldb;

using namespace lldb_private;

using namespace lldb_private::platform_gdb_server;

LLDB_PLUGIN_DEFINE_ADV(PlatformRemoteGDBServer, PlatformGDB)

static bool g_initialized = false;

// UnixSignals does not store the signal names or descriptions itself.

// It holds onto StringRefs. Becaue we may get signal information dynamically

// from the remote, these strings need persistent storage client-side.

static std::mutex g_signal_string_mutex;

static llvm::StringSet<> g_signal_string_storage;

void PlatformRemoteGDBServer::Initialize() {

  Platform::Initialize();

  if (!g_initialized) {

    g_initialized = true;

    PluginManager::RegisterPlugin(

        PlatformRemoteGDBServer::GetPluginNameStatic(),

        PlatformRemoteGDBServer::GetDescriptionStatic(),

        PlatformRemoteGDBServer::CreateInstance);

  }

}

void PlatformRemoteGDBServer::Terminate() {

  if (g_initialized) {

    g_initialized = false;

    PluginManager::UnregisterPlugin(PlatformRemoteGDBServer::CreateInstance);

  }

  Platform::Terminate();

}

PlatformSP PlatformRemoteGDBServer::CreateInstance(bool force,

                                                   const ArchSpec *arch) {

  bool create = force;

  if (!create) {

    create = !arch->TripleVendorWasSpecified() && 
!arch->TripleOSWasSpecified()40
;

  }

  if (create)

    return PlatformSP(new PlatformRemoteGDBServer());

  return PlatformSP();

}

llvm::StringRef PlatformRemoteGDBServer::GetDescriptionStatic() {

  return "A platform that uses the GDB remote protocol as the communication "

         "transport.";

}

llvm::StringRef PlatformRemoteGDBServer::GetDescription() {

  if (m_platform_description.empty()) {

    if (IsConnected()) {

      // Send the get description packet

    }

  }

  if (!m_platform_description.empty())

    return m_platform_description.c_str();

  return GetDescriptionStatic();

}

bool PlatformRemoteGDBServer::GetModuleSpec(const FileSpec &module_file_spec,

                                            const ArchSpec &arch,

                                            ModuleSpec &module_spec) {

  Log *log = GetLog(LLDBLog::Platform);

  const auto module_path = module_file_spec.GetPath(false);

  if (!m_gdb_client_up ||

      !m_gdb_client_up->GetModuleInfo(module_file_spec, arch, module_spec)) {

    LLDB_LOGF(

        log,

        "PlatformRemoteGDBServer::%s - failed to get module info for %s:%s",

        __FUNCTION__, module_path.c_str(),

        arch.GetTriple().getTriple().c_str());

    return false;

  }

  if (log) {

    StreamString stream;

    module_spec.Dump(stream);

    LLDB_LOGF(log,

              "PlatformRemoteGDBServer::%s - got module info for (%s:%s) : %s",

              __FUNCTION__, module_path.c_str(),

              arch.GetTriple().getTriple().c_str(), stream.GetData());

  }

  return true;

}

Status PlatformRemoteGDBServer::GetFileWithUUID(const FileSpec &platform_file,

                                                const UUID *uuid_ptr,

                                                FileSpec &local_file) {

  // Default to the local case

  local_file = platform_file;

  return Status();

}

/// Default Constructor

PlatformRemoteGDBServer::PlatformRemoteGDBServer()

    : Platform(/*is_host=*/false) {}

/// Destructor.

///

/// The destructor is virtual since this class is designed to be

/// inherited from by the plug-in instance.

PlatformRemoteGDBServer::~PlatformRemoteGDBServer() = default;

size_t PlatformRemoteGDBServer::GetSoftwareBreakpointTrapOpcode(

    Target &target, BreakpointSite *bp_site) {

  // This isn't needed if the z/Z packets are supported in the GDB remote

  // server. But we might need a packet to detect this.

  return 0;

}

bool PlatformRemoteGDBServer::GetRemoteOSVersion() {

  if (m_gdb_client_up)

    m_os_version = m_gdb_client_up->GetOSVersion();

  return !m_os_version.empty();

}

std::optional<std::string> PlatformRemoteGDBServer::GetRemoteOSBuildString() {

  if (!m_gdb_client_up)

    return std::nullopt;

  return m_gdb_client_up->GetOSBuildString();

}

std::optional<std::string>

PlatformRemoteGDBServer::GetRemoteOSKernelDescription() {

  if (!m_gdb_client_up)

    return std::nullopt;

  return m_gdb_client_up->GetOSKernelDescription();

}

// Remote Platform subclasses need to override this function

ArchSpec PlatformRemoteGDBServer::GetRemoteSystemArchitecture() {

  if (!m_gdb_client_up)

    return ArchSpec();

  return m_gdb_client_up->GetSystemArchitecture();

}

FileSpec PlatformRemoteGDBServer::GetRemoteWorkingDirectory() {

  if (IsConnected()) {

    Log *log = GetLog(LLDBLog::Platform);

    FileSpec working_dir;

    if (m_gdb_client_up->GetWorkingDir(working_dir) && 
log13
)

      LLDB_LOGF(log,

                "PlatformRemoteGDBServer::GetRemoteWorkingDirectory() -> '%s'",

                working_dir.GetPath().c_str());

    return working_dir;

  } else {

    return Platform::GetRemoteWorkingDirectory();

  }

}

bool PlatformRemoteGDBServer::SetRemoteWorkingDirectory(

    const FileSpec &working_dir) {

  if (IsConnected()) {

    // Clear the working directory it case it doesn't get set correctly. This

    // will for use to re-read it

    Log *log = GetLog(LLDBLog::Platform);

    LLDB_LOGF(log, "PlatformRemoteGDBServer::SetRemoteWorkingDirectory('%s')",

              working_dir.GetPath().c_str());

    return m_gdb_client_up->SetWorkingDir(working_dir) == 0;

  } else

    return Platform::SetRemoteWorkingDirectory(working_dir);

}

bool PlatformRemoteGDBServer::IsConnected() const {

  if (m_gdb_client_up) {

    assert(m_gdb_client_up->IsConnected());

    return true;

  }

  return false;

}

Status PlatformRemoteGDBServer::ConnectRemote(Args &args) {

  Status error;

  if (IsConnected()) {

    error.SetErrorStringWithFormat("the platform is already connected to '%s', "

                                   "execute 'platform disconnect' to close the "

                                   "current connection",

                                   GetHostname());

    return error;

  }

  if (args.GetArgumentCount() != 1) {

    error.SetErrorString(

        "\"platform connect\" takes a single argument: <connect-url>");

    return error;

  }

  const char *url = args.GetArgumentAtIndex(0);

  if (!url)

    return Status("URL is null.");

  std::optional<URI> parsed_url = URI::Parse(url);

  if (!parsed_url)

    return Status("Invalid URL: %s", url);

  // We're going to reuse the hostname when we connect to the debugserver.

  m_platform_scheme = parsed_url->scheme.str();

  m_platform_hostname = parsed_url->hostname.str();

  auto client_up =

      std::make_unique<process_gdb_remote::GDBRemoteCommunicationClient>();

  client_up->SetPacketTimeout(

      process_gdb_remote::ProcessGDBRemote::GetPacketTimeout());

  client_up->SetConnection(std::make_unique<ConnectionFileDescriptor>());

  client_up->Connect(url, &error);

  if (error.Fail())

    return error;

  if (client_up->HandshakeWithServer(&error)) {

    m_gdb_client_up = std::move(client_up);

    m_gdb_client_up->GetHostInfo();

    // If a working directory was set prior to connecting, send it down

    // now.

    if (m_working_dir)

      m_gdb_client_up->SetWorkingDir(m_working_dir);

    m_supported_architectures.clear();

    ArchSpec remote_arch = m_gdb_client_up->GetSystemArchitecture();

    if (remote_arch) {

      m_supported_architectures.push_back(remote_arch);

      if (remote_arch.GetTriple().isArch64Bit())

        m_supported_architectures.push_back(

            ArchSpec(remote_arch.GetTriple().get32BitArchVariant()));

    }

  } else {

    client_up->Disconnect();

    if (error.Success())

      error.SetErrorString("handshake failed");

  }

  return error;

}

Status PlatformRemoteGDBServer::DisconnectRemote() {

  Status error;

  m_gdb_client_up.reset();

  m_remote_signals_sp.reset();

  return error;

}

const char *PlatformRemoteGDBServer::GetHostname() {

  if (m_gdb_client_up)

    m_gdb_client_up->GetHostname(m_hostname);

  if (m_hostname.empty())

    return nullptr;

  return m_hostname.c_str();

}

std::optional<std::string>

PlatformRemoteGDBServer::DoGetUserName(UserIDResolver::id_t uid) {

  std::string name;

  if (m_gdb_client_up && m_gdb_client_up->GetUserName(uid, name))

    return std::move(name);

  return std::nullopt;

}

std::optional<std::string>

PlatformRemoteGDBServer::DoGetGroupName(UserIDResolver::id_t gid) {

  std::string name;

  if (m_gdb_client_up && m_gdb_client_up->GetGroupName(gid, name))

    return std::move(name);

  return std::nullopt;

}

uint32_t PlatformRemoteGDBServer::FindProcesses(

    const ProcessInstanceInfoMatch &match_info,

    ProcessInstanceInfoList &process_infos) {

  if (m_gdb_client_up)

    return m_gdb_client_up->FindProcesses(match_info, process_infos);

  return 0;

}

bool PlatformRemoteGDBServer::GetProcessInfo(

    lldb::pid_t pid, ProcessInstanceInfo &process_info) {

  if (m_gdb_client_up)

    return m_gdb_client_up->GetProcessInfo(pid, process_info);

  return false;

}

Status PlatformRemoteGDBServer::LaunchProcess(ProcessLaunchInfo &launch_info) {

  Log *log = GetLog(LLDBLog::Platform);

  Status error;

  LLDB_LOGF(log, "PlatformRemoteGDBServer::%s() called", __FUNCTION__);

  if (!IsConnected())

    return Status("Not connected.");

  auto num_file_actions = launch_info.GetNumFileActions();

  for (decltype(num_file_actions) i = 0; i < num_file_actions; ++i) {

    const auto file_action = launch_info.GetFileActionAtIndex(i);

    if (file_action->GetAction() != FileAction::eFileActionOpen)

      continue;

    switch (file_action->GetFD()) {

    case STDIN_FILENO:

      m_gdb_client_up->SetSTDIN(file_action->GetFileSpec());

      break;

    case STDOUT_FILENO:

      m_gdb_client_up->SetSTDOUT(file_action->GetFileSpec());

      break;

    case STDERR_FILENO:

      m_gdb_client_up->SetSTDERR(file_action->GetFileSpec());

      break;

    }

  }

  m_gdb_client_up->SetDisableASLR(

      launch_info.GetFlags().Test(eLaunchFlagDisableASLR));

  m_gdb_client_up->SetDetachOnError(

      launch_info.GetFlags().Test(eLaunchFlagDetachOnError));

  FileSpec working_dir = launch_info.GetWorkingDirectory();

  if (working_dir) {

    m_gdb_client_up->SetWorkingDir(working_dir);

  }

  // Send the environment and the program + arguments after we connect

  m_gdb_client_up->SendEnvironment(launch_info.GetEnvironment());

  ArchSpec arch_spec = launch_info.GetArchitecture();

  const char *arch_triple = arch_spec.GetTriple().str().c_str();

  m_gdb_client_up->SendLaunchArchPacket(arch_triple);

  LLDB_LOGF(

      log,

      "PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'",

      __FUNCTION__, arch_triple ? arch_triple : "<NULL>");

  {

    // Scope for the scoped timeout object

    process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(

        *m_gdb_client_up, std::chrono::seconds(5));

    // Since we can't send argv0 separate from the executable path, we need to

    // make sure to use the actual executable path found in the launch_info...

    Args args = launch_info.GetArguments();

    if (FileSpec exe_file = launch_info.GetExecutableFile())

      args.ReplaceArgumentAtIndex(0, exe_file.GetPath(false));

    if (llvm::Error err = m_gdb_client_up->LaunchProcess(args)) {

      error.SetErrorStringWithFormatv("Cannot launch '{0}': {1}",

                                      args.GetArgumentAtIndex(0),

                                      llvm::fmt_consume(std::move(err)));

      return error;

    }

  }

  const auto pid = m_gdb_client_up->GetCurrentProcessID(false);

  if (pid != LLDB_INVALID_PROCESS_ID) {

    launch_info.SetProcessID(pid);

    LLDB_LOGF(log,

              "PlatformRemoteGDBServer::%s() pid %" PRIu64

              " launched successfully",

              __FUNCTION__, pid);

  } else {

    LLDB_LOGF(log,

              "PlatformRemoteGDBServer::%s() launch succeeded but we "

              "didn't get a valid process id back!",

              __FUNCTION__);

    error.SetErrorString("failed to get PID");

  }

  return error;

}

Status PlatformRemoteGDBServer::KillProcess(const lldb::pid_t pid) {

  if (!KillSpawnedProcess(pid))

    return Status("failed to kill remote spawned process");

  return Status();

}

lldb::ProcessSP

PlatformRemoteGDBServer::DebugProcess(ProcessLaunchInfo &launch_info,

                                      Debugger &debugger, Target &target,

                                      Status &error) {

  lldb::ProcessSP process_sp;

  if (IsRemote()) {

    if (IsConnected()) {

      lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;

      std::string connect_url;

      if (!LaunchGDBServer(debugserver_pid, connect_url)) {

        error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",

                                       GetHostname());

      } else {

        // The darwin always currently uses the GDB remote debugger plug-in

        // so even when debugging locally we are debugging remotely!

        process_sp = target.CreateProcess(launch_info.GetListener(),

                                          "gdb-remote", nullptr, true);

        if (process_sp) {

          process_sp->HijackProcessEvents(launch_info.GetHijackListener());

          process_sp->SetShadowListener(launch_info.GetShadowListener());

          error = process_sp->ConnectRemote(connect_url.c_str());

          // Retry the connect remote one time...

          if (error.Fail())

            error = process_sp->ConnectRemote(connect_url.c_str());

          if (error.Success())

            error = process_sp->Launch(launch_info);

          else if (debugserver_pid != LLDB_INVALID_PROCESS_ID) {

            printf("error: connect remote failed (%s)\n", error.AsCString());

            KillSpawnedProcess(debugserver_pid);

          }

        }

      }

    } else {

      error.SetErrorString("not connected to remote gdb server");

    }

  }

  return process_sp;

}

bool PlatformRemoteGDBServer::LaunchGDBServer(lldb::pid_t &pid,

                                              std::string &connect_url) {

  assert(IsConnected());

  ArchSpec remote_arch = GetRemoteSystemArchitecture();

  llvm::Triple &remote_triple = remote_arch.GetTriple();

  uint16_t port = 0;

  std::string socket_name;

  bool launch_result = false;

  if (remote_triple.getVendor() == llvm::Triple::Apple &&

      remote_triple.getOS() == llvm::Triple::IOS) {

    // When remote debugging to iOS, we use a USB mux that always talks to

    // localhost, so we will need the remote debugserver to accept connections

    // only from localhost, no matter what our current hostname is

    launch_result =

        m_gdb_client_up->LaunchGDBServer("127.0.0.1", pid, port, socket_name);

  } else {

    // All other hosts should use their actual hostname

    launch_result =

        m_gdb_client_up->LaunchGDBServer(nullptr, pid, port, socket_name);

  }

  if (!launch_result)

    return false;

  connect_url =

      MakeGdbServerUrl(m_platform_scheme, m_platform_hostname, port,

                       (socket_name.empty()) ? nullptr : 
socket_name.c_str()0
);

  return true;

}

bool PlatformRemoteGDBServer::KillSpawnedProcess(lldb::pid_t pid) {

  assert(IsConnected());

  return m_gdb_client_up->KillSpawnedProcess(pid);

}

lldb::ProcessSP PlatformRemoteGDBServer::Attach(

    ProcessAttachInfo &attach_info, Debugger &debugger,

    Target *target, // Can be NULL, if NULL create a new target, else use

                    // existing one

    Status &error) {

  lldb::ProcessSP process_sp;

  if (IsRemote()) {

    if (IsConnected()) {

      lldb::pid_t debugserver_pid = LLDB_INVALID_PROCESS_ID;

      std::string connect_url;

      if (!LaunchGDBServer(debugserver_pid, connect_url)) {

        error.SetErrorStringWithFormat("unable to launch a GDB server on '%s'",

                                       GetHostname());

      } else {

        if (target == nullptr) {

          TargetSP new_target_sp;

          error = debugger.GetTargetList().CreateTarget(

              debugger, "", "", eLoadDependentsNo, nullptr, new_target_sp);

          target = new_target_sp.get();

        } else

          error.Clear();

        if (target && error.Success()) {

          // The darwin always currently uses the GDB remote debugger plug-in

          // so even when debugging locally we are debugging remotely!

          process_sp =

              target->CreateProcess(attach_info.GetListenerForProcess(debugger),

                                    "gdb-remote", nullptr, true);

          if (process_sp) {

            error = process_sp->ConnectRemote(connect_url.c_str());

            if (error.Success()) {

              ListenerSP listener_sp = attach_info.GetHijackListener();

              if (listener_sp)

                process_sp->HijackProcessEvents(listener_sp);

              process_sp->SetShadowListener(attach_info.GetShadowListener());

              error = process_sp->Attach(attach_info);

            }

            if (error.Fail() && debugserver_pid != LLDB_INVALID_PROCESS_ID) {

              KillSpawnedProcess(debugserver_pid);

            }

          }

        }

      }

    } else {

      error.SetErrorString("not connected to remote gdb server");

    }

  }

  return process_sp;

}

Status PlatformRemoteGDBServer::MakeDirectory(const FileSpec &file_spec,

                                              uint32_t mode) {

  if (!IsConnected())

    return Status("Not connected.");

  Status error = m_gdb_client_up->MakeDirectory(file_spec, mode);

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOGF(log,

            "PlatformRemoteGDBServer::MakeDirectory(path='%s', mode=%o) "

            "error = %u (%s)",

            file_spec.GetPath().c_str(), mode, error.GetError(),

            error.AsCString());

  return error;

}

Status PlatformRemoteGDBServer::GetFilePermissions(const FileSpec &file_spec,

                                                   uint32_t &file_permissions) {

  if (!IsConnected())

    return Status("Not connected.");

  Status error =

      m_gdb_client_up->GetFilePermissions(file_spec, file_permissions);

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOGF(log,

            "PlatformRemoteGDBServer::GetFilePermissions(path='%s', "

            "file_permissions=%o) error = %u (%s)",

            file_spec.GetPath().c_str(), file_permissions, error.GetError(),

            error.AsCString());

  return error;

}

Status PlatformRemoteGDBServer::SetFilePermissions(const FileSpec &file_spec,

                                                   uint32_t file_permissions) {

  if (!IsConnected())

    return Status("Not connected.");

  Status error =

      m_gdb_client_up->SetFilePermissions(file_spec, file_permissions);

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOGF(log,

            "PlatformRemoteGDBServer::SetFilePermissions(path='%s', "

            "file_permissions=%o) error = %u (%s)",

            file_spec.GetPath().c_str(), file_permissions, error.GetError(),

            error.AsCString());

  return error;

}

lldb::user_id_t PlatformRemoteGDBServer::OpenFile(const FileSpec &file_spec,

                                                  File::OpenOptions flags,

                                                  uint32_t mode,

                                                  Status &error) {

  if (IsConnected())

    return m_gdb_client_up->OpenFile(file_spec, flags, mode, error);

  return LLDB_INVALID_UID;

}

bool PlatformRemoteGDBServer::CloseFile(lldb::user_id_t fd, Status &error) {

  if (IsConnected())

    return m_gdb_client_up->CloseFile(fd, error);

  error = Status("Not connected.");

  return false;

}

lldb::user_id_t

PlatformRemoteGDBServer::GetFileSize(const FileSpec &file_spec) {

  if (IsConnected())

    return m_gdb_client_up->GetFileSize(file_spec);

  return LLDB_INVALID_UID;

}

void PlatformRemoteGDBServer::AutoCompleteDiskFileOrDirectory(

    CompletionRequest &request, bool only_dir) {

  if (IsConnected())

    m_gdb_client_up->AutoCompleteDiskFileOrDirectory(request, only_dir);

}

uint64_t PlatformRemoteGDBServer::ReadFile(lldb::user_id_t fd, uint64_t offset,

                                           void *dst, uint64_t dst_len,

                                           Status &error) {

  if (IsConnected())

    return m_gdb_client_up->ReadFile(fd, offset, dst, dst_len, error);

  error = Status("Not connected.");

  return 0;

}

uint64_t PlatformRemoteGDBServer::WriteFile(lldb::user_id_t fd, uint64_t offset,

                                            const void *src, uint64_t src_len,

                                            Status &error) {

  if (IsConnected())

    return m_gdb_client_up->WriteFile(fd, offset, src, src_len, error);

  error = Status("Not connected.");

  return 0;

}

Status PlatformRemoteGDBServer::PutFile(const FileSpec &source,

                                        const FileSpec &destination,

                                        uint32_t uid, uint32_t gid) {

  return Platform::PutFile(source, destination, uid, gid);

}

Status PlatformRemoteGDBServer::CreateSymlink(

    const FileSpec &src, // The name of the link is in src

    const FileSpec &dst) // The symlink points to dst

{

  if (!IsConnected())

    return Status("Not connected.");

  Status error = m_gdb_client_up->CreateSymlink(src, dst);

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOGF(log,

            "PlatformRemoteGDBServer::CreateSymlink(src='%s', dst='%s') "

            "error = %u (%s)",

            src.GetPath().c_str(), dst.GetPath().c_str(), error.GetError(),

            error.AsCString());

  return error;

}

Status PlatformRemoteGDBServer::Unlink(const FileSpec &file_spec) {

  if (!IsConnected())

    return Status("Not connected.");

  Status error = m_gdb_client_up->Unlink(file_spec);

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOGF(log, "PlatformRemoteGDBServer::Unlink(path='%s') error = %u (%s)",

            file_spec.GetPath().c_str(), error.GetError(), error.AsCString());

  return error;

}

bool PlatformRemoteGDBServer::GetFileExists(const FileSpec &file_spec) {

  if (IsConnected())

    return m_gdb_client_up->GetFileExists(file_spec);

  return false;

}

Status PlatformRemoteGDBServer::RunShellCommand(

    llvm::StringRef shell, llvm::StringRef command,

    const FileSpec &

        working_dir, // Pass empty FileSpec to use the current working directory

    int *status_ptr, // Pass NULL if you don't want the process exit status

    int *signo_ptr,  // Pass NULL if you don't want the signal that caused the

                     // process to exit

    std::string

        *command_output, // Pass NULL if you don't want the command output

    const Timeout<std::micro> &timeout) {

  if (!IsConnected())

    return Status("Not connected.");

  return m_gdb_client_up->RunShellCommand(command, working_dir, status_ptr,

                                          signo_ptr, command_output, timeout);

}

void PlatformRemoteGDBServer::CalculateTrapHandlerSymbolNames() {

  m_trap_handlers.push_back(ConstString("_sigtramp"));

}

const UnixSignalsSP &PlatformRemoteGDBServer::GetRemoteUnixSignals() {

  if (!IsConnected())

    return Platform::GetRemoteUnixSignals();

  if (m_remote_signals_sp)

    return m_remote_signals_sp;

  // If packet not implemented or JSON failed to parse, we'll guess the signal

  // set based on the remote architecture.

  m_remote_signals_sp = UnixSignals::Create(GetRemoteSystemArchitecture());

  StringExtractorGDBRemote response;

  auto result =

      m_gdb_client_up->SendPacketAndWaitForResponse("jSignalsInfo", response);

  if (result != decltype(result)::Success ||

      response.GetResponseType() != response.eResponse)

    return m_remote_signals_sp;

  auto object_sp = StructuredData::ParseJSON(response.GetStringRef());

  if (!object_sp || 
!object_sp->IsValid()0
)

    return m_remote_signals_sp;

  auto array_sp = object_sp->GetAsArray();

  if (!array_sp || !array_sp->IsValid())

    return m_remote_signals_sp;

  auto remote_signals_sp = std::make_shared<lldb_private::GDBRemoteSignals>();

  bool done = array_sp->ForEach(

      [&remote_signals_sp](StructuredData::Object *object) -> bool {

        if (!object || !object->IsValid())

          return false;

        auto dict = object->GetAsDictionary();

        if (!dict || !dict->IsValid())

          return false;

        // Signal number and signal name are required.

        uint64_t signo;

        if (!dict->GetValueForKeyAsInteger("signo", signo))

          return false;

        llvm::StringRef name;

        if (!dict->GetValueForKeyAsString("name", name))

          return false;

        // We can live without short_name, description, etc.

        bool suppress{false};

        auto object_sp = dict->GetValueForKey("suppress");

        if (object_sp && object_sp->IsValid())

          suppress = object_sp->GetBooleanValue();

        bool stop{false};

        object_sp = dict->GetValueForKey("stop");

        if (object_sp && object_sp->IsValid())

          stop = object_sp->GetBooleanValue();

        bool notify{false};

        object_sp = dict->GetValueForKey("notify");

        if (object_sp && object_sp->IsValid())

          notify = object_sp->GetBooleanValue();

        std::string description;

        object_sp = dict->GetValueForKey("description");

        if (object_sp && object_sp->IsValid())

          description = std::string(object_sp->GetStringValue());

        llvm::StringRef name_backed, description_backed;

        {

          std::lock_guard<std::mutex> guard(g_signal_string_mutex);

          name_backed =

              g_signal_string_storage.insert(name).first->getKeyData();

          if (!description.empty())

            description_backed =

                g_signal_string_storage.insert(description).first->getKeyData();

        }

        remote_signals_sp->AddSignal(signo, name_backed, suppress, stop, notify,

                                     description_backed);

        return true;

      });

  if (done)

    m_remote_signals_sp = std::move(remote_signals_sp);

  return m_remote_signals_sp;

}

std::string PlatformRemoteGDBServer::MakeGdbServerUrl(

    const std::string &platform_scheme, const std::string &platform_hostname,

    uint16_t port, const char *socket_name) {

  const char *override_scheme =

      getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_SCHEME");

  const char *override_hostname =

      getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_HOSTNAME");

  const char *port_offset_c_str =

      getenv("LLDB_PLATFORM_REMOTE_GDB_SERVER_PORT_OFFSET");

  int port_offset = port_offset_c_str ? 
::atoi(port_offset_c_str)0
 : 0;

  return MakeUrl(override_scheme ? 
override_scheme0
 : platform_scheme.c_str(),

                 override_hostname ? 
override_hostname0

                                   : platform_hostname.c_str(),

                 port + port_offset, socket_name);

}

std::string PlatformRemoteGDBServer::MakeUrl(const char *scheme,

                                             const char *hostname,

                                             uint16_t port, const char *path) {

  StreamString result;

  result.Printf("%s://[%s]", scheme, hostname);

  if (port != 0)

    result.Printf(":%u", port);

  if (path)

    result.Write(path, strlen(path));

  return std::string(result.GetString());

}

size_t PlatformRemoteGDBServer::ConnectToWaitingProcesses(Debugger &debugger,

                                                          Status &error) {

  std::vector<std::string> connection_urls;

  GetPendingGdbServerList(connection_urls);

  for (size_t i = 0; i < connection_urls.size(); 
++i0
) {

    ConnectProcess(connection_urls[i].c_str(), "gdb-remote", debugger, nullptr, error);

    if (error.Fail())

      return i; // We already connected to i process successfully

  }

  return connection_urls.size();

}

size_t PlatformRemoteGDBServer::GetPendingGdbServerList(

    std::vector<std::string> &connection_urls) {

  std::vector<std::pair<uint16_t, std::string>> remote_servers;

  if (!IsConnected())

    return 0;

  m_gdb_client_up->QueryGDBServer(remote_servers);

  for (const auto &gdbserver : remote_servers) {

    const char *socket_name_cstr =

        gdbserver.second.empty() ? nullptr : gdbserver.second.c_str();

    connection_urls.emplace_back(

        MakeGdbServerUrl(m_platform_scheme, m_platform_hostname,

                         gdbserver.first, socket_name_cstr));

  }

  return connection_urls.size();

}