Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 771 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp b/gnu/llvm/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
new file mode 100644
index 00000000000..2223e1625b1
--- /dev/null
+++ b/gnu/llvm/lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp
@@ -0,0 +1,771 @@
+//===-- ConnectionFileDescriptorPosix.cpp -----------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#if defined(__APPLE__)
+// Enable this special support for Apple builds where we can have unlimited
+// select bounds. We tried switching to poll() and kqueue and we were panicing
+// the kernel, so we have to stick with select for now.
+#define _DARWIN_UNLIMITED_SELECT
+#endif
+
+#include "lldb/Host/posix/ConnectionFileDescriptorPosix.h"
+#include "lldb/Host/Config.h"
+#include "lldb/Host/Socket.h"
+#include "lldb/Host/SocketAddress.h"
+#include "lldb/Utility/SelectHelper.h"
+#include "lldb/Utility/Timeout.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+#if LLDB_ENABLE_POSIX
+#include <termios.h>
+#include <unistd.h>
+#endif
+
+#include <memory>
+#include <sstream>
+
+#include "llvm/Support/Errno.h"
+#include "llvm/Support/ErrorHandling.h"
+#if defined(__APPLE__)
+#include "llvm/ADT/SmallVector.h"
+#endif
+#include "lldb/Host/Host.h"
+#include "lldb/Host/Socket.h"
+#include "lldb/Host/common/TCPSocket.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/StreamString.h"
+#include "lldb/Utility/Timer.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+const char *ConnectionFileDescriptor::LISTEN_SCHEME = "listen";
+const char *ConnectionFileDescriptor::ACCEPT_SCHEME = "accept";
+const char *ConnectionFileDescriptor::UNIX_ACCEPT_SCHEME = "unix-accept";
+const char *ConnectionFileDescriptor::CONNECT_SCHEME = "connect";
+const char *ConnectionFileDescriptor::TCP_CONNECT_SCHEME = "tcp-connect";
+const char *ConnectionFileDescriptor::UDP_SCHEME = "udp";
+const char *ConnectionFileDescriptor::UNIX_CONNECT_SCHEME = "unix-connect";
+const char *ConnectionFileDescriptor::UNIX_ABSTRACT_CONNECT_SCHEME =
+    "unix-abstract-connect";
+const char *ConnectionFileDescriptor::FD_SCHEME = "fd";
+const char *ConnectionFileDescriptor::FILE_SCHEME = "file";
+
+namespace {
+
+llvm::Optional<llvm::StringRef> GetURLAddress(llvm::StringRef url,
+                                              llvm::StringRef scheme) {
+  if (!url.consume_front(scheme))
+    return llvm::None;
+  if (!url.consume_front("://"))
+    return llvm::None;
+  return url;
+}
+}
+
+ConnectionFileDescriptor::ConnectionFileDescriptor(bool child_processes_inherit)
+    : Connection(), m_pipe(), m_mutex(), m_shutting_down(false),
+      m_waiting_for_accept(false),
+      m_child_processes_inherit(child_processes_inherit) {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION |
+                                                  LIBLLDB_LOG_OBJECT));
+  LLDB_LOGF(log, "%p ConnectionFileDescriptor::ConnectionFileDescriptor ()",
+            static_cast<void *>(this));
+}
+
+ConnectionFileDescriptor::ConnectionFileDescriptor(int fd, bool owns_fd)
+    : Connection(), m_pipe(), m_mutex(), m_shutting_down(false),
+      m_waiting_for_accept(false), m_child_processes_inherit(false) {
+  m_write_sp = std::make_shared<NativeFile>(fd, File::eOpenOptionWrite, owns_fd);
+  m_read_sp = std::make_shared<NativeFile>(fd, File::eOpenOptionRead, false);
+
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION |
+                                                  LIBLLDB_LOG_OBJECT));
+  LLDB_LOGF(log,
+            "%p ConnectionFileDescriptor::ConnectionFileDescriptor (fd = "
+            "%i, owns_fd = %i)",
+            static_cast<void *>(this), fd, owns_fd);
+  OpenCommandPipe();
+}
+
+ConnectionFileDescriptor::ConnectionFileDescriptor(Socket *socket)
+    : Connection(), m_pipe(), m_mutex(), m_shutting_down(false),
+      m_waiting_for_accept(false), m_child_processes_inherit(false) {
+  InitializeSocket(socket);
+}
+
+ConnectionFileDescriptor::~ConnectionFileDescriptor() {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION |
+                                                  LIBLLDB_LOG_OBJECT));
+  LLDB_LOGF(log, "%p ConnectionFileDescriptor::~ConnectionFileDescriptor ()",
+            static_cast<void *>(this));
+  Disconnect(nullptr);
+  CloseCommandPipe();
+}
+
+void ConnectionFileDescriptor::OpenCommandPipe() {
+  CloseCommandPipe();
+
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  // Make the command file descriptor here:
+  Status result = m_pipe.CreateNew(m_child_processes_inherit);
+  if (!result.Success()) {
+    LLDB_LOGF(log,
+              "%p ConnectionFileDescriptor::OpenCommandPipe () - could not "
+              "make pipe: %s",
+              static_cast<void *>(this), result.AsCString());
+  } else {
+    LLDB_LOGF(log,
+              "%p ConnectionFileDescriptor::OpenCommandPipe() - success "
+              "readfd=%d writefd=%d",
+              static_cast<void *>(this), m_pipe.GetReadFileDescriptor(),
+              m_pipe.GetWriteFileDescriptor());
+  }
+}
+
+void ConnectionFileDescriptor::CloseCommandPipe() {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOGF(log, "%p ConnectionFileDescriptor::CloseCommandPipe()",
+            static_cast<void *>(this));
+
+  m_pipe.Close();
+}
+
+bool ConnectionFileDescriptor::IsConnected() const {
+  return (m_read_sp && m_read_sp->IsValid()) ||
+         (m_write_sp && m_write_sp->IsValid());
+}
+
+ConnectionStatus ConnectionFileDescriptor::Connect(llvm::StringRef path,
+                                                   Status *error_ptr) {
+  std::lock_guard<std::recursive_mutex> guard(m_mutex);
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOGF(log, "%p ConnectionFileDescriptor::Connect (url = '%s')",
+            static_cast<void *>(this), path.str().c_str());
+
+  OpenCommandPipe();
+
+  if (!path.empty()) {
+    llvm::Optional<llvm::StringRef> addr;
+    if ((addr = GetURLAddress(path, LISTEN_SCHEME))) {
+      // listen://HOST:PORT
+      return SocketListenAndAccept(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, ACCEPT_SCHEME))) {
+      // unix://SOCKNAME
+      return NamedSocketAccept(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, UNIX_ACCEPT_SCHEME))) {
+      // unix://SOCKNAME
+      return NamedSocketAccept(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, CONNECT_SCHEME))) {
+      return ConnectTCP(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, TCP_CONNECT_SCHEME))) {
+      return ConnectTCP(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, UDP_SCHEME))) {
+      return ConnectUDP(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, UNIX_CONNECT_SCHEME))) {
+      // unix-connect://SOCKNAME
+      return NamedSocketConnect(*addr, error_ptr);
+    } else if ((addr = GetURLAddress(path, UNIX_ABSTRACT_CONNECT_SCHEME))) {
+      // unix-abstract-connect://SOCKNAME
+      return UnixAbstractSocketConnect(*addr, error_ptr);
+    }
+#if LLDB_ENABLE_POSIX
+    else if ((addr = GetURLAddress(path, FD_SCHEME))) {
+      // Just passing a native file descriptor within this current process that
+      // is already opened (possibly from a service or other source).
+      int fd = -1;
+
+      if (!addr->getAsInteger(0, fd)) {
+        // We have what looks to be a valid file descriptor, but we should make
+        // sure it is. We currently are doing this by trying to get the flags
+        // from the file descriptor and making sure it isn't a bad fd.
+        errno = 0;
+        int flags = ::fcntl(fd, F_GETFL, 0);
+        if (flags == -1 || errno == EBADF) {
+          if (error_ptr)
+            error_ptr->SetErrorStringWithFormat("stale file descriptor: %s",
+                                                path.str().c_str());
+          m_read_sp.reset();
+          m_write_sp.reset();
+          return eConnectionStatusError;
+        } else {
+          // Don't take ownership of a file descriptor that gets passed to us
+          // since someone else opened the file descriptor and handed it to us.
+          // TODO: Since are using a URL to open connection we should
+          // eventually parse options using the web standard where we have
+          // "fd://123?opt1=value;opt2=value" and we can have an option be
+          // "owns=1" or "owns=0" or something like this to allow us to specify
+          // this. For now, we assume we must assume we don't own it.
+
+          std::unique_ptr<TCPSocket> tcp_socket;
+          tcp_socket.reset(new TCPSocket(fd, false, false));
+          // Try and get a socket option from this file descriptor to see if
+          // this is a socket and set m_is_socket accordingly.
+          int resuse;
+          bool is_socket =
+              !!tcp_socket->GetOption(SOL_SOCKET, SO_REUSEADDR, resuse);
+          if (is_socket) {
+            m_read_sp = std::move(tcp_socket);
+            m_write_sp = m_read_sp;
+          } else {
+            m_read_sp =
+                std::make_shared<NativeFile>(fd, File::eOpenOptionRead, false);
+            m_write_sp =
+                std::make_shared<NativeFile>(fd, File::eOpenOptionWrite, false);
+          }
+          m_uri = *addr;
+          return eConnectionStatusSuccess;
+        }
+      }
+
+      if (error_ptr)
+        error_ptr->SetErrorStringWithFormat("invalid file descriptor: \"%s\"",
+                                            path.str().c_str());
+      m_read_sp.reset();
+      m_write_sp.reset();
+      return eConnectionStatusError;
+    } else if ((addr = GetURLAddress(path, FILE_SCHEME))) {
+      std::string addr_str = addr->str();
+      // file:///PATH
+      int fd = llvm::sys::RetryAfterSignal(-1, ::open, addr_str.c_str(), O_RDWR);
+      if (fd == -1) {
+        if (error_ptr)
+          error_ptr->SetErrorToErrno();
+        return eConnectionStatusError;
+      }
+
+      if (::isatty(fd)) {
+        // Set up serial terminal emulation
+        struct termios options;
+        ::tcgetattr(fd, &options);
+
+        // Set port speed to maximum
+        ::cfsetospeed(&options, B115200);
+        ::cfsetispeed(&options, B115200);
+
+        // Raw input, disable echo and signals
+        options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
+
+        // Make sure only one character is needed to return from a read
+        options.c_cc[VMIN] = 1;
+        options.c_cc[VTIME] = 0;
+
+        llvm::sys::RetryAfterSignal(-1, ::tcsetattr, fd, TCSANOW, &options);
+      }
+
+      int flags = ::fcntl(fd, F_GETFL, 0);
+      if (flags >= 0) {
+        if ((flags & O_NONBLOCK) == 0) {
+          flags |= O_NONBLOCK;
+          ::fcntl(fd, F_SETFL, flags);
+        }
+      }
+      m_read_sp = std::make_shared<NativeFile>(fd, File::eOpenOptionRead, true);
+      m_write_sp = std::make_shared<NativeFile>(fd, File::eOpenOptionWrite, false);
+      return eConnectionStatusSuccess;
+    }
+#endif
+    if (error_ptr)
+      error_ptr->SetErrorStringWithFormat("unsupported connection URL: '%s'",
+                                          path.str().c_str());
+    return eConnectionStatusError;
+  }
+  if (error_ptr)
+    error_ptr->SetErrorString("invalid connect arguments");
+  return eConnectionStatusError;
+}
+
+bool ConnectionFileDescriptor::InterruptRead() {
+  size_t bytes_written = 0;
+  Status result = m_pipe.Write("i", 1, bytes_written);
+  return result.Success();
+}
+
+ConnectionStatus ConnectionFileDescriptor::Disconnect(Status *error_ptr) {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOGF(log, "%p ConnectionFileDescriptor::Disconnect ()",
+            static_cast<void *>(this));
+
+  ConnectionStatus status = eConnectionStatusSuccess;
+
+  if (!IsConnected()) {
+    LLDB_LOGF(
+        log, "%p ConnectionFileDescriptor::Disconnect(): Nothing to disconnect",
+        static_cast<void *>(this));
+    return eConnectionStatusSuccess;
+  }
+
+  if (m_read_sp && m_read_sp->IsValid() &&
+      m_read_sp->GetFdType() == IOObject::eFDTypeSocket)
+    static_cast<Socket &>(*m_read_sp).PreDisconnect();
+
+  // Try to get the ConnectionFileDescriptor's mutex.  If we fail, that is
+  // quite likely because somebody is doing a blocking read on our file
+  // descriptor.  If that's the case, then send the "q" char to the command
+  // file channel so the read will wake up and the connection will then know to
+  // shut down.
+  std::unique_lock<std::recursive_mutex> locker(m_mutex, std::defer_lock);
+  if (!locker.try_lock()) {
+    if (m_pipe.CanWrite()) {
+      size_t bytes_written = 0;
+      Status result = m_pipe.Write("q", 1, bytes_written);
+      LLDB_LOGF(log,
+                "%p ConnectionFileDescriptor::Disconnect(): Couldn't get "
+                "the lock, sent 'q' to %d, error = '%s'.",
+                static_cast<void *>(this), m_pipe.GetWriteFileDescriptor(),
+                result.AsCString());
+    } else if (log) {
+      LLDB_LOGF(log,
+                "%p ConnectionFileDescriptor::Disconnect(): Couldn't get the "
+                "lock, but no command pipe is available.",
+                static_cast<void *>(this));
+    }
+    locker.lock();
+  }
+
+  // Prevents reads and writes during shutdown.
+  m_shutting_down = true;
+
+  Status error = m_read_sp->Close();
+  Status error2 = m_write_sp->Close();
+  if (error.Fail() || error2.Fail())
+    status = eConnectionStatusError;
+  if (error_ptr)
+    *error_ptr = error.Fail() ? error : error2;
+
+  // Close any pipes we were using for async interrupts
+  m_pipe.Close();
+
+  m_uri.clear();
+  m_shutting_down = false;
+  return status;
+}
+
+size_t ConnectionFileDescriptor::Read(void *dst, size_t dst_len,
+                                      const Timeout<std::micro> &timeout,
+                                      ConnectionStatus &status,
+                                      Status *error_ptr) {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+
+  std::unique_lock<std::recursive_mutex> locker(m_mutex, std::defer_lock);
+  if (!locker.try_lock()) {
+    LLDB_LOGF(log,
+              "%p ConnectionFileDescriptor::Read () failed to get the "
+              "connection lock.",
+              static_cast<void *>(this));
+    if (error_ptr)
+      error_ptr->SetErrorString("failed to get the connection lock for read.");
+
+    status = eConnectionStatusTimedOut;
+    return 0;
+  }
+
+  if (m_shutting_down) {
+    if (error_ptr)
+      error_ptr->SetErrorString("shutting down");
+    status = eConnectionStatusError;
+    return 0;
+  }
+
+  status = BytesAvailable(timeout, error_ptr);
+  if (status != eConnectionStatusSuccess)
+    return 0;
+
+  Status error;
+  size_t bytes_read = dst_len;
+  error = m_read_sp->Read(dst, bytes_read);
+
+  if (log) {
+    LLDB_LOGF(log,
+              "%p ConnectionFileDescriptor::Read()  fd = %" PRIu64
+              ", dst = %p, dst_len = %" PRIu64 ") => %" PRIu64 ", error = %s",
+              static_cast<void *>(this),
+              static_cast<uint64_t>(m_read_sp->GetWaitableHandle()),
+              static_cast<void *>(dst), static_cast<uint64_t>(dst_len),
+              static_cast<uint64_t>(bytes_read), error.AsCString());
+  }
+
+  if (bytes_read == 0) {
+    error.Clear(); // End-of-file.  Do not automatically close; pass along for
+                   // the end-of-file handlers.
+    status = eConnectionStatusEndOfFile;
+  }
+
+  if (error_ptr)
+    *error_ptr = error;
+
+  if (error.Fail()) {
+    uint32_t error_value = error.GetError();
+    switch (error_value) {
+    case EAGAIN: // The file was marked for non-blocking I/O, and no data were
+                 // ready to be read.
+      if (m_read_sp->GetFdType() == IOObject::eFDTypeSocket)
+        status = eConnectionStatusTimedOut;
+      else
+        status = eConnectionStatusSuccess;
+      return 0;
+
+    case EFAULT:  // Buf points outside the allocated address space.
+    case EINTR:   // A read from a slow device was interrupted before any data
+                  // arrived by the delivery of a signal.
+    case EINVAL:  // The pointer associated with fildes was negative.
+    case EIO:     // An I/O error occurred while reading from the file system.
+                  // The process group is orphaned.
+                  // The file is a regular file, nbyte is greater than 0, the
+                  // starting position is before the end-of-file, and the
+                  // starting position is greater than or equal to the offset
+                  // maximum established for the open file descriptor
+                  // associated with fildes.
+    case EISDIR:  // An attempt is made to read a directory.
+    case ENOBUFS: // An attempt to allocate a memory buffer fails.
+    case ENOMEM:  // Insufficient memory is available.
+      status = eConnectionStatusError;
+      break; // Break to close....
+
+    case ENOENT:     // no such file or directory
+    case EBADF:      // fildes is not a valid file or socket descriptor open for
+                     // reading.
+    case ENXIO:      // An action is requested of a device that does not exist..
+                     // A requested action cannot be performed by the device.
+    case ECONNRESET: // The connection is closed by the peer during a read
+                     // attempt on a socket.
+    case ENOTCONN:   // A read is attempted on an unconnected socket.
+      status = eConnectionStatusLostConnection;
+      break; // Break to close....
+
+    case ETIMEDOUT: // A transmission timeout occurs during a read attempt on a
+                    // socket.
+      status = eConnectionStatusTimedOut;
+      return 0;
+
+    default:
+      LLDB_LOG(log, "this = {0}, unexpected error: {1}", this,
+               llvm::sys::StrError(error_value));
+      status = eConnectionStatusError;
+      break; // Break to close....
+    }
+
+    return 0;
+  }
+  return bytes_read;
+}
+
+size_t ConnectionFileDescriptor::Write(const void *src, size_t src_len,
+                                       ConnectionStatus &status,
+                                       Status *error_ptr) {
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOGF(log,
+            "%p ConnectionFileDescriptor::Write (src = %p, src_len = %" PRIu64
+            ")",
+            static_cast<void *>(this), static_cast<const void *>(src),
+            static_cast<uint64_t>(src_len));
+
+  if (!IsConnected()) {
+    if (error_ptr)
+      error_ptr->SetErrorString("not connected");
+    status = eConnectionStatusNoConnection;
+    return 0;
+  }
+
+  if (m_shutting_down) {
+    if (error_ptr)
+      error_ptr->SetErrorString("shutting down");
+    status = eConnectionStatusError;
+    return 0;
+  }
+
+  Status error;
+
+  size_t bytes_sent = src_len;
+  error = m_write_sp->Write(src, bytes_sent);
+
+  if (log) {
+    LLDB_LOGF(log,
+              "%p ConnectionFileDescriptor::Write(fd = %" PRIu64
+              ", src = %p, src_len = %" PRIu64 ") => %" PRIu64 " (error = %s)",
+              static_cast<void *>(this),
+              static_cast<uint64_t>(m_write_sp->GetWaitableHandle()),
+              static_cast<const void *>(src), static_cast<uint64_t>(src_len),
+              static_cast<uint64_t>(bytes_sent), error.AsCString());
+  }
+
+  if (error_ptr)
+    *error_ptr = error;
+
+  if (error.Fail()) {
+    switch (error.GetError()) {
+    case EAGAIN:
+    case EINTR:
+      status = eConnectionStatusSuccess;
+      return 0;
+
+    case ECONNRESET: // The connection is closed by the peer during a read
+                     // attempt on a socket.
+    case ENOTCONN:   // A read is attempted on an unconnected socket.
+      status = eConnectionStatusLostConnection;
+      break; // Break to close....
+
+    default:
+      status = eConnectionStatusError;
+      break; // Break to close....
+    }
+
+    return 0;
+  }
+
+  status = eConnectionStatusSuccess;
+  return bytes_sent;
+}
+
+std::string ConnectionFileDescriptor::GetURI() { return m_uri; }
+
+// This ConnectionFileDescriptor::BytesAvailable() uses select() via
+// SelectHelper
+//
+// PROS:
+//  - select is consistent across most unix platforms
+//  - The Apple specific version allows for unlimited fds in the fd_sets by
+//    setting the _DARWIN_UNLIMITED_SELECT define prior to including the
+//    required header files.
+// CONS:
+//  - on non-Apple platforms, only supports file descriptors up to FD_SETSIZE.
+//     This implementation  will assert if it runs into that hard limit to let
+//     users know that another ConnectionFileDescriptor::BytesAvailable() should
+//     be used or a new version of ConnectionFileDescriptor::BytesAvailable()
+//     should be written for the system that is running into the limitations.
+
+ConnectionStatus
+ConnectionFileDescriptor::BytesAvailable(const Timeout<std::micro> &timeout,
+                                         Status *error_ptr) {
+  // Don't need to take the mutex here separately since we are only called from
+  // Read.  If we ever get used more generally we will need to lock here as
+  // well.
+
+  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOG(log, "this = {0}, timeout = {1}", this, timeout);
+
+  // Make a copy of the file descriptors to make sure we don't have another
+  // thread change these values out from under us and cause problems in the
+  // loop below where like in FS_SET()
+  const IOObject::WaitableHandle handle = m_read_sp->GetWaitableHandle();
+  const int pipe_fd = m_pipe.GetReadFileDescriptor();
+
+  if (handle != IOObject::kInvalidHandleValue) {
+    SelectHelper select_helper;
+    if (timeout)
+      select_helper.SetTimeout(*timeout);
+
+    select_helper.FDSetRead(handle);
+#if defined(_WIN32)
+    // select() won't accept pipes on Windows.  The entire Windows codepath
+    // needs to be converted over to using WaitForMultipleObjects and event
+    // HANDLEs, but for now at least this will allow ::select() to not return
+    // an error.
+    const bool have_pipe_fd = false;
+#else
+    const bool have_pipe_fd = pipe_fd >= 0;
+#endif
+    if (have_pipe_fd)
+      select_helper.FDSetRead(pipe_fd);
+
+    while (handle == m_read_sp->GetWaitableHandle()) {
+
+      Status error = select_helper.Select();
+
+      if (error_ptr)
+        *error_ptr = error;
+
+      if (error.Fail()) {
+        switch (error.GetError()) {
+        case EBADF: // One of the descriptor sets specified an invalid
+                    // descriptor.
+          return eConnectionStatusLostConnection;
+
+        case EINVAL: // The specified time limit is invalid. One of its
+                     // components is negative or too large.
+        default:     // Other unknown error
+          return eConnectionStatusError;
+
+        case ETIMEDOUT:
+          return eConnectionStatusTimedOut;
+
+        case EAGAIN: // The kernel was (perhaps temporarily) unable to
+                     // allocate the requested number of file descriptors, or
+                     // we have non-blocking IO
+        case EINTR:  // A signal was delivered before the time limit
+          // expired and before any of the selected events occurred.
+          break; // Lets keep reading to until we timeout
+        }
+      } else {
+        if (select_helper.FDIsSetRead(handle))
+          return eConnectionStatusSuccess;
+
+        if (select_helper.FDIsSetRead(pipe_fd)) {
+          // There is an interrupt or exit command in the command pipe Read the
+          // data from that pipe:
+          char c;
+
+          ssize_t bytes_read = llvm::sys::RetryAfterSignal(-1, ::read, pipe_fd, &c, 1);
+          assert(bytes_read == 1);
+          (void)bytes_read;
+          switch (c) {
+          case 'q':
+            LLDB_LOGF(log,
+                      "%p ConnectionFileDescriptor::BytesAvailable() "
+                      "got data: %c from the command channel.",
+                      static_cast<void *>(this), c);
+            return eConnectionStatusEndOfFile;
+          case 'i':
+            // Interrupt the current read
+            return eConnectionStatusInterrupted;
+          }
+        }
+      }
+    }
+  }
+
+  if (error_ptr)
+    error_ptr->SetErrorString("not connected");
+  return eConnectionStatusLostConnection;
+}
+
+ConnectionStatus
+ConnectionFileDescriptor::NamedSocketAccept(llvm::StringRef socket_name,
+                                            Status *error_ptr) {
+  Socket *socket = nullptr;
+  Status error =
+      Socket::UnixDomainAccept(socket_name, m_child_processes_inherit, socket);
+  if (error_ptr)
+    *error_ptr = error;
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  if (error.Fail()) {
+    return eConnectionStatusError;
+  }
+  m_uri.assign(socket_name);
+  return eConnectionStatusSuccess;
+}
+
+ConnectionStatus
+ConnectionFileDescriptor::NamedSocketConnect(llvm::StringRef socket_name,
+                                             Status *error_ptr) {
+  Socket *socket = nullptr;
+  Status error =
+      Socket::UnixDomainConnect(socket_name, m_child_processes_inherit, socket);
+  if (error_ptr)
+    *error_ptr = error;
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  if (error.Fail()) {
+    return eConnectionStatusError;
+  }
+  m_uri.assign(socket_name);
+  return eConnectionStatusSuccess;
+}
+
+lldb::ConnectionStatus
+ConnectionFileDescriptor::UnixAbstractSocketConnect(llvm::StringRef socket_name,
+                                                    Status *error_ptr) {
+  Socket *socket = nullptr;
+  Status error = Socket::UnixAbstractConnect(socket_name,
+                                             m_child_processes_inherit, socket);
+  if (error_ptr)
+    *error_ptr = error;
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  if (error.Fail()) {
+    return eConnectionStatusError;
+  }
+  m_uri.assign(socket_name);
+  return eConnectionStatusSuccess;
+}
+
+ConnectionStatus
+ConnectionFileDescriptor::SocketListenAndAccept(llvm::StringRef s,
+                                                Status *error_ptr) {
+  m_port_predicate.SetValue(0, eBroadcastNever);
+
+  Socket *socket = nullptr;
+  m_waiting_for_accept = true;
+  Status error = Socket::TcpListen(s, m_child_processes_inherit, socket,
+                                   &m_port_predicate);
+  if (error_ptr)
+    *error_ptr = error;
+  if (error.Fail())
+    return eConnectionStatusError;
+
+  std::unique_ptr<Socket> listening_socket_up;
+
+  listening_socket_up.reset(socket);
+  socket = nullptr;
+  error = listening_socket_up->Accept(socket);
+  listening_socket_up.reset();
+  if (error_ptr)
+    *error_ptr = error;
+  if (error.Fail())
+    return eConnectionStatusError;
+
+  InitializeSocket(socket);
+  return eConnectionStatusSuccess;
+}
+
+ConnectionStatus ConnectionFileDescriptor::ConnectTCP(llvm::StringRef s,
+                                                      Status *error_ptr) {
+  Socket *socket = nullptr;
+  Status error = Socket::TcpConnect(s, m_child_processes_inherit, socket);
+  if (error_ptr)
+    *error_ptr = error;
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  if (error.Fail()) {
+    return eConnectionStatusError;
+  }
+  m_uri.assign(s);
+  return eConnectionStatusSuccess;
+}
+
+ConnectionStatus ConnectionFileDescriptor::ConnectUDP(llvm::StringRef s,
+                                                      Status *error_ptr) {
+  Socket *socket = nullptr;
+  Status error = Socket::UdpConnect(s, m_child_processes_inherit, socket);
+  if (error_ptr)
+    *error_ptr = error;
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  if (error.Fail()) {
+    return eConnectionStatusError;
+  }
+  m_uri.assign(s);
+  return eConnectionStatusSuccess;
+}
+
+uint16_t
+ConnectionFileDescriptor::GetListeningPort(const Timeout<std::micro> &timeout) {
+  auto Result = m_port_predicate.WaitForValueNotEqualTo(0, timeout);
+  return Result ? *Result : 0;
+}
+
+bool ConnectionFileDescriptor::GetChildProcessesInherit() const {
+  return m_child_processes_inherit;
+}
+
+void ConnectionFileDescriptor::SetChildProcessesInherit(
+    bool child_processes_inherit) {
+  m_child_processes_inherit = child_processes_inherit;
+}
+
+void ConnectionFileDescriptor::InitializeSocket(Socket *socket) {
+  m_write_sp.reset(socket);
+  m_read_sp = m_write_sp;
+  m_uri = socket->GetRemoteConnectionURI();
+}