make SetReceiveBufferSize and SetSendBufferSize return net error codes (instead of bools)

net/udp/udp_socket_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/udp/udp_socket_win.h"
 
 #include <mstcpip.h>
 
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 370 matching lines @@
 
 int UDPSocketWin::CreateSocket(int addr_family) {
   addr_family_ = addr_family;
   socket_ = CreatePlatformSocket(addr_family_, SOCK_DGRAM, IPPROTO_UDP);
   if (socket_ == INVALID_SOCKET)
     return MapSystemError(WSAGetLastError());
   core_ = new Core(this);
   return OK;
 }
 
-bool UDPSocketWin::SetReceiveBufferSize(int32 size) {
+int UDPSocketWin::SetReceiveBufferSize(int32 size) {
   DCHECK(CalledOnValidThread());
-  setsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
-             reinterpret_cast<const char*>(&size), sizeof(size));
-  // If the setsockopt fails, but the buffer is big enough, we will return
-  // success. It is not worth testing the return value as we still need to check
-  // via getsockopt anyway according to Windows documentation.
+  int rv = setsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
+                      reinterpret_cast<const char*>(&size), sizeof(size));
+  if (rv != 0)
+    return MapSystemError(WSAGetLastError());
+
+  // According to documentation, setsockopt may succeed, but we need to check
+  // the results via getsockopt to be sure it works on Windows.
   int32 actual_size = 0;
   int option_size = sizeof(actual_size);
-  int rv = getsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
-                      reinterpret_cast<char*>(&actual_size), &option_size);
+  rv = getsockopt(socket_, SOL_SOCKET, SO_RCVBUF,
+                  reinterpret_cast<char*>(&actual_size), &option_size);
   if (rv != 0)
-    return false;
-  if (actual_size < size) {
-    UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SocketReceiveBufferUnchangeable",
-                                actual_size, 1000, 1000000, 50);
-  }
-  return actual_size >= size;
+    return MapSystemError(WSAGetLastError());
+  if (actual_size >= size)
+    return OK;
+  UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SocketUnchangeableReceiveBuffer",
+                              actual_size, 1000, 1000000, 50);
+  return ERR_SOCKET_RECEIVE_BUFFER_SIZE_UNCHANGEABLE;
 }
 
-bool UDPSocketWin::SetSendBufferSize(int32 size) {
+int UDPSocketWin::SetSendBufferSize(int32 size) {
   DCHECK(CalledOnValidThread());
-  setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
-             reinterpret_cast<const char*>(&size), sizeof(size));
-  // If the setsockopt fails, but the buffer is big enough, we will return
-  // success. It is not worth testing the return value as we still need to check
-  // via getsockopt anyway according to Windows documentation.
+  int rv = setsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                      reinterpret_cast<const char*>(&size), sizeof(size));
+  if (rv != 0)
+    return MapSystemError(WSAGetLastError());
+  // According to documentation, setsockopt may succeed, but we need to check
+  // the results via getsockopt to be sure it works on Windows.
   int32 actual_size = 0;
   int option_size = sizeof(actual_size);
-  int rv = getsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
-                      reinterpret_cast<char*>(&actual_size), &option_size);
+  rv = getsockopt(socket_, SOL_SOCKET, SO_SNDBUF,
+                  reinterpret_cast<char*>(&actual_size), &option_size);
   if (rv != 0)
-    return false;
-  if (actual_size < size) {
-    UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SocketUnchangeableSendBuffer",
-                                actual_size, 1000, 1000000, 50);
-  }
-  return actual_size >= size;
+    return MapSystemError(WSAGetLastError());
+  if (actual_size >= size)
+    return OK;
+  UMA_HISTOGRAM_CUSTOM_COUNTS("Net.SocketUnchangeableSendBuffer",
+                              actual_size, 1000, 1000000, 50);
+  return ERR_SOCKET_SEND_BUFFER_SIZE_UNCHANGEABLE;
 }
 
 void UDPSocketWin::AllowAddressReuse() {
   DCHECK(CalledOnValidThread());
   DCHECK(!is_connected());
 
   socket_options_ |= SOCKET_OPTION_REUSE_ADDRESS;
 }
 
 void UDPSocketWin::AllowBroadcast() {
@@ skipping 393 matching lines @@
 // Note: setsockopt(IP_TOS) does not work on windows XP and later.
 int UDPSocketWin::SetDiffServCodePoint(DiffServCodePoint dscp) {
   return ERR_NOT_IMPLEMENTED;
 }
 
 void UDPSocketWin::DetachFromThread() {
   base::NonThreadSafe::DetachFromThread();
 }
 
 }  // namespace net