Revert "Added synchronous socket implementation to dart:io."

runtime/bin/sync_socket_linux.cc

-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#if !defined(DART_IO_DISABLED)
-
-#include "platform/globals.h"
-#if defined(HOST_OS_LINUX)
-
-#include "bin/sync_socket.h"
-
-#include <errno.h>  // NOLINT
-
-#include "bin/fdutils.h"
-#include "platform/signal_blocker.h"
-
-namespace dart {
-namespace bin {
-
-SynchronousSocket::SynchronousSocket(intptr_t fd) : fd_(fd) {}
-
-
-void SynchronousSocket::SetClosedFd() {
-  fd_ = kClosedFd;
-}
-
-
-bool SynchronousSocket::Initialize() {
-  // Nothing to do on Linux.
-  return true;
-}
-
-
-static intptr_t Create(const RawAddr& addr) {
-  intptr_t fd;
-  intptr_t type = SOCK_STREAM | SOCK_CLOEXEC;
-  fd = NO_RETRY_EXPECTED(socket(addr.ss.ss_family, type, 0));
-  if (fd < 0) {
-    return -1;
-  }
-  return fd;
-}
-
-
-static intptr_t Connect(intptr_t fd, const RawAddr& addr) {
-  intptr_t result = TEMP_FAILURE_RETRY(
-      connect(fd, &addr.addr, SocketAddress::GetAddrLength(addr)));
-  if (result == 0) {
-    return fd;
-  }
-  ASSERT(errno != EINPROGRESS);
-  FDUtils::FDUtils::SaveErrorAndClose(fd);
-  return -1;
-}
-
-
-intptr_t SynchronousSocket::CreateConnect(const RawAddr& addr) {
-  intptr_t fd = Create(addr);
-  if (fd < 0) {
-    return fd;
-  }
-  return Connect(fd, addr);
-}
-
-
-void SynchronousSocket::ShutdownRead(intptr_t fd) {
-  VOID_NO_RETRY_EXPECTED(shutdown(fd, SHUT_RD));
-}
-
-
-void SynchronousSocket::ShutdownWrite(intptr_t fd) {
-  VOID_NO_RETRY_EXPECTED(shutdown(fd, SHUT_WR));
-}
-
-}  // namespace bin
-}  // namespace dart
-
-#endif  // defined(HOST_OS_LINUX)
-
-#endif  // !defined(DART_IO_DISABLED)