C++ ProcessLaunchInfo::GetWorkingDirectory方法代码示例

HostProcess
ProcessLauncherAndroid::LaunchProcess(const ProcessLaunchInfo &launch_info, Error &error)
{
    // TODO: Handle other launch parameters specified in launc_info

    char exe_path[PATH_MAX];
    launch_info.GetExecutableFile().GetPath(exe_path, sizeof(exe_path));

    lldb::pid_t pid = ::fork();
    if (pid == static_cast<lldb::pid_t>(-1))
    {
        // Fork failed
        error.SetErrorStringWithFormat("Fork failed with error message: %s", strerror(errno));
        return HostProcess(LLDB_INVALID_PROCESS_ID);
    }
    else if (pid == 0)
    {
        if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDIN_FILENO)) {
            const char* path = file_action->GetPath();
            if (path && ::strlen(path))
                if (!DupDescriptor(path, STDIN_FILENO, O_RDONLY))
                    exit(-1);
        }

        if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDOUT_FILENO)) {
            const char* path = file_action->GetPath();
            if (path && ::strlen(path))
                if (!DupDescriptor(path, STDOUT_FILENO, O_WRONLY | O_CREAT | O_TRUNC))
                    exit(-1);
        }

        if (const lldb_private::FileAction *file_action = launch_info.GetFileActionForFD(STDERR_FILENO)) {
            const char* path = file_action->GetPath();
            if (path && ::strlen(path))
                if (!DupDescriptor(path, STDERR_FILENO, O_WRONLY | O_CREAT | O_TRUNC))
                    exit(-1);
        }

        // Child process
        const char **argv = launch_info.GetArguments().GetConstArgumentVector();

        Args env = launch_info.GetEnvironmentEntries();
        FixupEnvironment(env);
        const char **envp = env.GetConstArgumentVector();

        const char *working_dir = launch_info.GetWorkingDirectory();
        if (working_dir != nullptr && working_dir[0])
        {
            if (::chdir(working_dir) != 0)
                exit(-1);
        }

        execve(argv[0],
               const_cast<char *const *>(argv),
               const_cast<char *const *>(envp));
        exit(-1);
    }
   
    return HostProcess(pid);
}

Error
PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info)
{
    Error error;
    lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;
    
    m_gdb_client.SetSTDIN ("/dev/null");
    m_gdb_client.SetSTDOUT ("/dev/null");
    m_gdb_client.SetSTDERR ("/dev/null");
    m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR));
    m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError));
    
    const char *working_dir = launch_info.GetWorkingDirectory();
    if (working_dir && working_dir[0])
    {
        m_gdb_client.SetWorkingDir (working_dir);
    }
    
    // Send the environment and the program + arguments after we connect
    const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector();

    if (envp)
    {
        const char *env_entry;
        for (int i=0; (env_entry = envp[i]); ++i)
        {
            if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0)
                break;
        }
    }
    
    ArchSpec arch_spec = launch_info.GetArchitecture();
    const char *arch_triple = arch_spec.GetTriple().str().c_str();
    
    m_gdb_client.SendLaunchArchPacket(arch_triple);
    
    const uint32_t old_packet_timeout = m_gdb_client.SetPacketTimeout (5);
    int arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info);
    m_gdb_client.SetPacketTimeout (old_packet_timeout);
    if (arg_packet_err == 0)
    {
        std::string error_str;
        if (m_gdb_client.GetLaunchSuccess (error_str))
        {
            pid = m_gdb_client.GetCurrentProcessID ();
            if (pid != LLDB_INVALID_PROCESS_ID)
                launch_info.SetProcessID (pid);
        }
        else
        {
            error.SetErrorString (error_str.c_str());
        }
    }
    else
    {
        error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err);
    }
    return error;
}

Error
ProcessPOSIX::DoLaunch (Module *module,
                        ProcessLaunchInfo &launch_info)
{
    Error error;
    assert(m_monitor == NULL);

    const char* working_dir = launch_info.GetWorkingDirectory();
    if (working_dir) {
      FileSpec WorkingDir(working_dir, true);
      if (!WorkingDir || WorkingDir.GetFileType() != FileSpec::eFileTypeDirectory)
      {
          error.SetErrorStringWithFormat("No such file or directory: %s", working_dir);
          return error;
      }
    }

    SetPrivateState(eStateLaunching);

    const lldb_private::FileAction *file_action;

    // Default of NULL will mean to use existing open file descriptors
    const char *stdin_path = NULL;
    const char *stdout_path = NULL;
    const char *stderr_path = NULL;

    const char * dbg_pts_path = launch_info.GetPTY().GetSlaveName(NULL,0);

    file_action = launch_info.GetFileActionForFD (STDIN_FILENO);
    stdin_path = GetFilePath(file_action, stdin_path, dbg_pts_path);

    file_action = launch_info.GetFileActionForFD (STDOUT_FILENO);
    stdout_path = GetFilePath(file_action, stdout_path, dbg_pts_path);

    file_action = launch_info.GetFileActionForFD (STDERR_FILENO);
    stderr_path = GetFilePath(file_action, stderr_path, dbg_pts_path);

    m_monitor = new ProcessMonitor (this, 
                                    module,
                                    launch_info.GetArguments().GetConstArgumentVector(), 
                                    launch_info.GetEnvironmentEntries().GetConstArgumentVector(),
                                    stdin_path, 
                                    stdout_path, 
                                    stderr_path,
                                    working_dir,
                                    launch_info,
                                    error);

    m_module = module;

    if (!error.Success())
        return error;

    SetSTDIOFileDescriptor(m_monitor->GetTerminalFD());

    SetID(m_monitor->GetPID());
    return error;
}

Error
ProcessFreeBSD::DoLaunch (Module *module,
                        ProcessLaunchInfo &launch_info)
{
    Error error;
    assert(m_monitor == NULL);

    FileSpec working_dir = launch_info.GetWorkingDirectory();
    if (working_dir &&
            (!working_dir.ResolvePath() ||
             working_dir.GetFileType() != FileSpec::eFileTypeDirectory))
    {
        error.SetErrorStringWithFormat("No such file or directory: %s",
                working_dir.GetCString());
        return error;
    }

    SetPrivateState(eStateLaunching);

    const lldb_private::FileAction *file_action;

    // Default of empty will mean to use existing open file descriptors
    FileSpec stdin_file_spec{};
    FileSpec stdout_file_spec{};
    FileSpec stderr_file_spec{};

    const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL,0), false};

    file_action = launch_info.GetFileActionForFD (STDIN_FILENO);
    stdin_file_spec = GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec);

    file_action = launch_info.GetFileActionForFD (STDOUT_FILENO);
    stdout_file_spec = GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec);

    file_action = launch_info.GetFileActionForFD (STDERR_FILENO);
    stderr_file_spec = GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec);

    m_monitor = new ProcessMonitor(this,
                                   module,
                                   launch_info.GetArguments().GetConstArgumentVector(),
                                   launch_info.GetEnvironmentEntries().GetConstArgumentVector(),
                                   stdin_file_spec,
                                   stdout_file_spec,
                                   stderr_file_spec,
                                   working_dir,
                                   launch_info,
                                   error);

    m_module = module;

    if (!error.Success())
        return error;

    int terminal = m_monitor->GetTerminalFD();
    if (terminal >= 0) {
        // The reader thread will close the file descriptor when done, so we pass it a copy.
        int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0);
        if (stdio == -1) {
            error.SetErrorToErrno();
            return error;
        }
        SetSTDIOFileDescriptor(stdio);
    }

    SetID(m_monitor->GetPID());
    return error;
}

Error
Host::ShellExpandArguments (ProcessLaunchInfo &launch_info)
{
    Error error;
    if (launch_info.GetFlags().Test(eLaunchFlagShellExpandArguments))
    {
        FileSpec expand_tool_spec;
        if (!HostInfo::GetLLDBPath(lldb::ePathTypeSupportExecutableDir, expand_tool_spec))
        {
            error.SetErrorString("could not find argdumper tool");
            return error;
        }
        expand_tool_spec.AppendPathComponent("argdumper.exe");
        if (!expand_tool_spec.Exists())
        {
            error.SetErrorString("could not find argdumper tool");
            return error;
        }
        
        std::string quoted_cmd_string;
        launch_info.GetArguments().GetQuotedCommandString(quoted_cmd_string);
        std::replace(quoted_cmd_string.begin(), quoted_cmd_string.end(), '\\', '/');
        StreamString expand_command;
        
        expand_command.Printf("%s %s",
                              expand_tool_spec.GetPath().c_str(),
                              quoted_cmd_string.c_str());
        
        int status;
        std::string output;
        RunShellCommand(expand_command.GetData(), launch_info.GetWorkingDirectory(), &status, nullptr, &output, 10);
        
        if (status != 0)
        {
            error.SetErrorStringWithFormat("argdumper exited with error %d", status);
            return error;
        }
        
        auto data_sp = StructuredData::ParseJSON(output);
        if (!data_sp)
        {
            error.SetErrorString("invalid JSON");
            return error;
        }
        
        auto dict_sp = data_sp->GetAsDictionary();
        if (!data_sp)
        {
            error.SetErrorString("invalid JSON");
            return error;
        }
        
        auto args_sp = dict_sp->GetObjectForDotSeparatedPath("arguments");
        if (!args_sp)
        {
            error.SetErrorString("invalid JSON");
            return error;
        }
        
        auto args_array_sp = args_sp->GetAsArray();
        if (!args_array_sp)
        {
            error.SetErrorString("invalid JSON");
            return error;
        }
        
        launch_info.GetArguments().Clear();
        
        for (size_t i = 0;
             i < args_array_sp->GetSize();
             i++)
        {
            auto item_sp = args_array_sp->GetItemAtIndex(i);
            if (!item_sp)
                continue;
            auto str_sp = item_sp->GetAsString();
            if (!str_sp)
                continue;
            
            launch_info.GetArguments().AppendArgument(str_sp->GetValue().c_str());
        }
    }
    
    return error;
}

Error
Host::LaunchProcessPosixSpawn(const char *exe_path, const ProcessLaunchInfo &launch_info, lldb::pid_t &pid)
{
    Error error;
    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_HOST | LIBLLDB_LOG_PROCESS));

    posix_spawnattr_t attr;
    error.SetError( ::posix_spawnattr_init (&attr), eErrorTypePOSIX);

    if (error.Fail() || log)
        error.PutToLog(log, "::posix_spawnattr_init ( &attr )");
    if (error.Fail())
        return error;

    // Make a quick class that will cleanup the posix spawn attributes in case
    // we return in the middle of this function.
    lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy);

    sigset_t no_signals;
    sigset_t all_signals;
    sigemptyset (&no_signals);
    sigfillset (&all_signals);
    ::posix_spawnattr_setsigmask(&attr, &no_signals);
#if defined (__linux__)  || defined (__FreeBSD__)
    ::posix_spawnattr_setsigdefault(&attr, &no_signals);
#else
    ::posix_spawnattr_setsigdefault(&attr, &all_signals);
#endif

    short flags = GetPosixspawnFlags(launch_info);

    error.SetError( ::posix_spawnattr_setflags (&attr, flags), eErrorTypePOSIX);
    if (error.Fail() || log)
        error.PutToLog(log, "::posix_spawnattr_setflags ( &attr, flags=0x%8.8x )", flags);
    if (error.Fail())
        return error;

    // posix_spawnattr_setbinpref_np appears to be an Apple extension per:
    // http://www.unix.com/man-page/OSX/3/posix_spawnattr_setbinpref_np/
#if defined (__APPLE__) && !defined (__arm__)
    
    // Don't set the binpref if a shell was provided.  After all, that's only going to affect what version of the shell
    // is launched, not what fork of the binary is launched.  We insert "arch --arch <ARCH> as part of the shell invocation
    // to do that job on OSX.
    
    if (launch_info.GetShell() == nullptr)
    {
        // We don't need to do this for ARM, and we really shouldn't now that we
        // have multiple CPU subtypes and no posix_spawnattr call that allows us
        // to set which CPU subtype to launch...
        const ArchSpec &arch_spec = launch_info.GetArchitecture();
        cpu_type_t cpu = arch_spec.GetMachOCPUType();
        cpu_type_t sub = arch_spec.GetMachOCPUSubType();
        if (cpu != 0 &&
            cpu != static_cast<cpu_type_t>(UINT32_MAX) &&
            cpu != static_cast<cpu_type_t>(LLDB_INVALID_CPUTYPE) &&
            !(cpu == 0x01000007 && sub == 8)) // If haswell is specified, don't try to set the CPU type or we will fail 
        {
            size_t ocount = 0;
            error.SetError( ::posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &ocount), eErrorTypePOSIX);
            if (error.Fail() || log)
                error.PutToLog(log, "::posix_spawnattr_setbinpref_np ( &attr, 1, cpu_type = 0x%8.8x, count => %llu )", cpu, (uint64_t)ocount);

            if (error.Fail() || ocount != 1)
                return error;
        }
    }

#endif

    const char *tmp_argv[2];
    char * const *argv = (char * const*)launch_info.GetArguments().GetConstArgumentVector();
    char * const *envp = (char * const*)launch_info.GetEnvironmentEntries().GetConstArgumentVector();
    if (argv == NULL)
    {
        // posix_spawn gets very unhappy if it doesn't have at least the program
        // name in argv[0]. One of the side affects I have noticed is the environment
        // variables don't make it into the child process if "argv == NULL"!!!
        tmp_argv[0] = exe_path;
        tmp_argv[1] = NULL;
        argv = (char * const*)tmp_argv;
    }

#if !defined (__APPLE__)
    // manage the working directory
    char current_dir[PATH_MAX];
    current_dir[0] = '\0';
#endif

    FileSpec working_dir{launch_info.GetWorkingDirectory()};
    if (working_dir)
    {
#if defined (__APPLE__)
        // Set the working directory on this thread only
        if (__pthread_chdir(working_dir.GetCString()) < 0) {
            if (errno == ENOENT) {
                error.SetErrorStringWithFormat("No such file or directory: %s",
                        working_dir.GetCString());
            } else if (errno == ENOTDIR) {
                error.SetErrorStringWithFormat("Path doesn't name a directory: %s",
//.........这里部分代码省略.........

static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd,
                                              const ProcessLaunchInfo &info) {
  if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) {
    if (setpgid(0, 0) != 0)
      ExitWithError(error_fd, "setpgid");
  }

  for (size_t i = 0; i < info.GetNumFileActions(); ++i) {
    const FileAction &action = *info.GetFileActionAtIndex(i);
    switch (action.GetAction()) {
    case FileAction::eFileActionClose:
      if (close(action.GetFD()) != 0)
        ExitWithError(error_fd, "close");
      break;
    case FileAction::eFileActionDuplicate:
      if (dup2(action.GetFD(), action.GetActionArgument()) == -1)
        ExitWithError(error_fd, "dup2");
      break;
    case FileAction::eFileActionOpen:
      DupDescriptor(error_fd, action.GetFileSpec(), action.GetFD(),
                    action.GetActionArgument());
      break;
    case FileAction::eFileActionNone:
      break;
    }
  }

  const char **argv = info.GetArguments().GetConstArgumentVector();

  // Change working directory
  if (info.GetWorkingDirectory() &&
      0 != ::chdir(info.GetWorkingDirectory().GetCString()))
    ExitWithError(error_fd, "chdir");

  DisableASLRIfRequested(error_fd, info);
  Environment env = info.GetEnvironment();
  FixupEnvironment(env);
  Environment::Envp envp = env.getEnvp();

  // Clear the signal mask to prevent the child from being affected by any
  // masking done by the parent.
  sigset_t set;
  if (sigemptyset(&set) != 0 ||
      pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0)
    ExitWithError(error_fd, "pthread_sigmask");

  if (info.GetFlags().Test(eLaunchFlagDebug)) {
    // Do not inherit setgid powers.
    if (setgid(getgid()) != 0)
      ExitWithError(error_fd, "setgid");

    // HACK:
    // Close everything besides stdin, stdout, and stderr that has no file
    // action to avoid leaking. Only do this when debugging, as elsewhere we
    // actually rely on passing open descriptors to child processes.
    for (int fd = 3; fd < sysconf(_SC_OPEN_MAX); ++fd)
      if (!info.GetFileActionForFD(fd) && fd != error_fd)
        close(fd);

    // Start tracing this child that is about to exec.
    if (ptrace(PT_TRACE_ME, 0, nullptr, 0) == -1)
      ExitWithError(error_fd, "ptrace");
  }

  // Execute.  We should never return...
  execve(argv[0], const_cast<char *const *>(argv), envp);

#if defined(__linux__)
  if (errno == ETXTBSY) {
    // On android M and earlier we can get this error because the adb daemon
    // can hold a write handle on the executable even after it has finished
    // uploading it. This state lasts only a short time and happens only when
    // there are many concurrent adb commands being issued, such as when
    // running the test suite. (The file remains open when someone does an "adb
    // shell" command in the fork() child before it has had a chance to exec.)
    // Since this state should clear up quickly, wait a while and then give it
    // one more go.
    usleep(50000);
    execve(argv[0], const_cast<char *const *>(argv), envp);
  }
#endif

  // ...unless exec fails.  In which case we definitely need to end the child
  // here.
  ExitWithError(error_fd, "execve");
}

Error
PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info)
{
    Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM));
    Error error;

    if (log)
        log->Printf ("PlatformRemoteGDBServer::%s() called", __FUNCTION__);

    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.SetSTDIN(file_action->GetFileSpec());
            break;
        case STDOUT_FILENO:
            m_gdb_client.SetSTDOUT(file_action->GetFileSpec());
            break;
        case STDERR_FILENO:
            m_gdb_client.SetSTDERR(file_action->GetFileSpec());
            break;
        }
    }

    m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR));
    m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError));
    
    FileSpec working_dir = launch_info.GetWorkingDirectory();
    if (working_dir)
    {
        m_gdb_client.SetWorkingDir(working_dir);
    }
    
    // Send the environment and the program + arguments after we connect
    const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector();

    if (envp)
    {
        const char *env_entry;
        for (int i=0; (env_entry = envp[i]); ++i)
        {
            if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0)
                break;
        }
    }
    
    ArchSpec arch_spec = launch_info.GetArchitecture();
    const char *arch_triple = arch_spec.GetTriple().str().c_str();
    
    m_gdb_client.SendLaunchArchPacket(arch_triple);
    if (log)
        log->Printf ("PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'", __FUNCTION__, arch_triple ? arch_triple : "<NULL>");

    int arg_packet_err;
    {
        // Scope for the scoped timeout object
        process_gdb_remote::GDBRemoteCommunication::ScopedTimeout timeout(m_gdb_client, 5);
        arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info);
    }

    if (arg_packet_err == 0)
    {
        std::string error_str;
        if (m_gdb_client.GetLaunchSuccess (error_str))
        {
            const auto pid = m_gdb_client.GetCurrentProcessID (false);
            if (pid != LLDB_INVALID_PROCESS_ID)
            {
                launch_info.SetProcessID (pid);
                if (log)
                    log->Printf ("PlatformRemoteGDBServer::%s() pid %" PRIu64 " launched successfully", __FUNCTION__, pid);
            }
            else
            {
                if (log)
                    log->Printf ("PlatformRemoteGDBServer::%s() launch succeeded but we didn't get a valid process id back!", __FUNCTION__);
                error.SetErrorString ("failed to get PID");
            }
        }
        else
        {
            error.SetErrorString (error_str.c_str());
            if (log)
                log->Printf ("PlatformRemoteGDBServer::%s() launch failed: %s", __FUNCTION__, error.AsCString ());
        }
    }
    else
    {
        error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err);
    }
    return error;
}

Status ProcessFreeBSD::DoLaunch(Module *module,
                                ProcessLaunchInfo &launch_info) {
  Status error;
  assert(m_monitor == NULL);

  FileSpec working_dir = launch_info.GetWorkingDirectory();
  if (working_dir) {
    FileSystem::Instance().Resolve(working_dir);
    if (!FileSystem::Instance().IsDirectory(working_dir.GetPath())) {
      error.SetErrorStringWithFormat("No such file or directory: %s",
                                   working_dir.GetCString());
      return error;
    }
  }

  SetPrivateState(eStateLaunching);

  const lldb_private::FileAction *file_action;

  // Default of empty will mean to use existing open file descriptors
  FileSpec stdin_file_spec{};
  FileSpec stdout_file_spec{};
  FileSpec stderr_file_spec{};

  const FileSpec dbg_pts_file_spec{launch_info.GetPTY().GetSlaveName(NULL, 0)};

  file_action = launch_info.GetFileActionForFD(STDIN_FILENO);
  stdin_file_spec =
      GetFileSpec(file_action, stdin_file_spec, dbg_pts_file_spec);

  file_action = launch_info.GetFileActionForFD(STDOUT_FILENO);
  stdout_file_spec =
      GetFileSpec(file_action, stdout_file_spec, dbg_pts_file_spec);

  file_action = launch_info.GetFileActionForFD(STDERR_FILENO);
  stderr_file_spec =
      GetFileSpec(file_action, stderr_file_spec, dbg_pts_file_spec);

  m_monitor = new ProcessMonitor(
      this, module, launch_info.GetArguments().GetConstArgumentVector(),
      launch_info.GetEnvironment(), stdin_file_spec, stdout_file_spec,
      stderr_file_spec, working_dir, launch_info, error);

  m_module = module;

  if (!error.Success())
    return error;

  int terminal = m_monitor->GetTerminalFD();
  if (terminal >= 0) {
// The reader thread will close the file descriptor when done, so we pass it a
// copy.
#ifdef F_DUPFD_CLOEXEC
    int stdio = fcntl(terminal, F_DUPFD_CLOEXEC, 0);
    if (stdio == -1) {
      error.SetErrorToErrno();
      return error;
    }
#else
    // Special case when F_DUPFD_CLOEXEC does not exist (Debian kFreeBSD)
    int stdio = fcntl(terminal, F_DUPFD, 0);
    if (stdio == -1) {
      error.SetErrorToErrno();
      return error;
    }
    stdio = fcntl(terminal, F_SETFD, FD_CLOEXEC);
    if (stdio == -1) {
      error.SetErrorToErrno();
      return error;
    }
#endif
    SetSTDIOFileDescriptor(stdio);
  }

  SetID(m_monitor->GetPID());
  return error;
}

static void LLVM_ATTRIBUTE_NORETURN ChildFunc(int error_fd,
                                              const ProcessLaunchInfo &info) {
  // First, make sure we disable all logging. If we are logging to stdout, our
  // logs can be
  // mistaken for inferior output.
  Log::DisableAllLogChannels(nullptr);

  // Do not inherit setgid powers.
  if (setgid(getgid()) != 0)
    ExitWithError(error_fd, "setgid");

  if (info.GetFlags().Test(eLaunchFlagLaunchInSeparateProcessGroup)) {
    if (setpgid(0, 0) != 0)
      ExitWithError(error_fd, "setpgid");
  }

  for (size_t i = 0; i < info.GetNumFileActions(); ++i) {
    const FileAction &action = *info.GetFileActionAtIndex(i);
    switch (action.GetAction()) {
    case FileAction::eFileActionClose:
      if (close(action.GetFD()) != 0)
        ExitWithError(error_fd, "close");
      break;
    case FileAction::eFileActionDuplicate:
      if (dup2(action.GetFD(), action.GetActionArgument()) == -1)
        ExitWithError(error_fd, "dup2");
      break;
    case FileAction::eFileActionOpen:
      DupDescriptor(error_fd, action.GetFileSpec(), action.GetFD(),
                    action.GetActionArgument());
      break;
    case FileAction::eFileActionNone:
      break;
    }
  }

  const char **argv = info.GetArguments().GetConstArgumentVector();

  // Change working directory
  if (info.GetWorkingDirectory() &&
      0 != ::chdir(info.GetWorkingDirectory().GetCString()))
    ExitWithError(error_fd, "chdir");

  // Disable ASLR if requested.
  if (info.GetFlags().Test(lldb::eLaunchFlagDisableASLR)) {
    const unsigned long personality_get_current = 0xffffffff;
    int value = personality(personality_get_current);
    if (value == -1)
      ExitWithError(error_fd, "personality get");

    value = personality(ADDR_NO_RANDOMIZE | value);
    if (value == -1)
      ExitWithError(error_fd, "personality set");
  }

  Args env = info.GetEnvironmentEntries();
  FixupEnvironment(env);
  const char **envp = env.GetConstArgumentVector();

  // Clear the signal mask to prevent the child from being affected by
  // any masking done by the parent.
  sigset_t set;
  if (sigemptyset(&set) != 0 ||
      pthread_sigmask(SIG_SETMASK, &set, nullptr) != 0)
    ExitWithError(error_fd, "pthread_sigmask");

  if (info.GetFlags().Test(eLaunchFlagDebug)) {
    // HACK:
    // Close everything besides stdin, stdout, and stderr that has no file
    // action to avoid leaking. Only do this when debugging, as elsewhere we
    // actually rely on
    // passing open descriptors to child processes.
    for (int fd = 3; fd < sysconf(_SC_OPEN_MAX); ++fd)
      if (!info.GetFileActionForFD(fd) && fd != error_fd)
        close(fd);

    // Start tracing this child that is about to exec.
    if (ptrace(PTRACE_TRACEME, 0, nullptr, nullptr) == -1)
      ExitWithError(error_fd, "ptrace");
  }

  // Execute.  We should never return...
  execve(argv[0], const_cast<char *const *>(argv),
         const_cast<char *const *>(envp));

  if (errno == ETXTBSY) {
    // On android M and earlier we can get this error because the adb deamon can
    // hold a write
    // handle on the executable even after it has finished uploading it. This
    // state lasts
    // only a short time and happens only when there are many concurrent adb
    // commands being
    // issued, such as when running the test suite. (The file remains open when
    // someone does
    // an "adb shell" command in the fork() child before it has had a chance to
    // exec.) Since
    // this state should clear up quickly, wait a while and then give it one
    // more go.
    usleep(50000);
    execve(argv[0], const_cast<char *const *>(argv),
//.........这里部分代码省略.........

Error
PlatformRemoteGDBServer::LaunchProcess (ProcessLaunchInfo &launch_info)
{
    Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PLATFORM));
    Error error;
    lldb::pid_t pid = LLDB_INVALID_PROCESS_ID;

    if (log)
        log->Printf ("PlatformRemoteGDBServer::%s() called", __FUNCTION__);

    m_gdb_client.SetSTDIN ("/dev/null");
    m_gdb_client.SetSTDOUT ("/dev/null");
    m_gdb_client.SetSTDERR ("/dev/null");
    m_gdb_client.SetDisableASLR (launch_info.GetFlags().Test (eLaunchFlagDisableASLR));
    m_gdb_client.SetDetachOnError (launch_info.GetFlags().Test (eLaunchFlagDetachOnError));
    
    const char *working_dir = launch_info.GetWorkingDirectory();
    if (working_dir && working_dir[0])
    {
        m_gdb_client.SetWorkingDir (working_dir);
    }
    
    // Send the environment and the program + arguments after we connect
    const char **envp = launch_info.GetEnvironmentEntries().GetConstArgumentVector();

    if (envp)
    {
        const char *env_entry;
        for (int i=0; (env_entry = envp[i]); ++i)
        {
            if (m_gdb_client.SendEnvironmentPacket(env_entry) != 0)
                break;
        }
    }
    
    ArchSpec arch_spec = launch_info.GetArchitecture();
    const char *arch_triple = arch_spec.GetTriple().str().c_str();
    
    m_gdb_client.SendLaunchArchPacket(arch_triple);
    if (log)
        log->Printf ("PlatformRemoteGDBServer::%s() set launch architecture triple to '%s'", __FUNCTION__, arch_triple ? arch_triple : "<NULL>");

    const uint32_t old_packet_timeout = m_gdb_client.SetPacketTimeout (5);
    int arg_packet_err = m_gdb_client.SendArgumentsPacket (launch_info);
    m_gdb_client.SetPacketTimeout (old_packet_timeout);
    if (arg_packet_err == 0)
    {
        std::string error_str;
        if (m_gdb_client.GetLaunchSuccess (error_str))
        {
            pid = m_gdb_client.GetCurrentProcessID ();
            if (pid != LLDB_INVALID_PROCESS_ID)
            {
                launch_info.SetProcessID (pid);
                if (log)
                    log->Printf ("PlatformRemoteGDBServer::%s() pid %" PRIu64 " launched successfully", __FUNCTION__, pid);
            }
            else
            {
                if (log)
                    log->Printf ("PlatformRemoteGDBServer::%s() launch succeeded but we didn't get a valid process id back!", __FUNCTION__);
                // FIXME isn't this an error condition? Do we need to set an error here?  Check with Greg.
            }
        }
        else
        {
            error.SetErrorString (error_str.c_str());
            if (log)
                log->Printf ("PlatformRemoteGDBServer::%s() launch failed: %s", __FUNCTION__, error.AsCString ());
        }
    }
    else
    {
        error.SetErrorStringWithFormat("'A' packet returned an error: %i", arg_packet_err);
    }
    return error;
}