Various fixes for sync socket implementation.

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)