[NaCl SDK] nacl_io: Add initial support for getsockopt

native_client_sdk/src/libraries/nacl_io/mount_node_socket.cc

 // Copyright (c) 2013 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 "nacl_io/ossocket.h"
 #ifdef PROVIDES_SOCKET_API
 
 #include <errno.h>
 #include <string.h>
 #include <sys/fcntl.h>
@@ skipping 186 matching lines @@
 }
 
 Error MountNodeSocket::Listen(int backlog) {
   return EOPNOTSUPP;
 }
 
 Error MountNodeSocket::GetSockOpt(int lvl,
                                   int optname,
                                   void* optval,
                                   socklen_t* len) {
-  return EINVAL;
+  if (lvl != SOL_SOCKET)
+    return ENOPROTOOPT;
+
+  switch (optname) {
+    case SO_ERROR: {
+      int copy_bytes = std::min(sizeof(int), *len);
+      memcpy(optval, &last_errno_, copy_bytes);
+      *len = sizeof(int);
+      last_errno_ = 0;
+      return 0;
+    }
+  }
+
+  return ENOPROTOOPT;
 }
 
 Error MountNodeSocket::SetSockOpt(int lvl,
                                   int optname,
                                   const void* optval,
                                   socklen_t len) {
-  return EINVAL;
+  return ENOPROTOOPT;
 }
 
 Error MountNodeSocket::Bind(const struct sockaddr* addr, socklen_t len) {
   return EINVAL;
 }
 
 
 Error MountNodeSocket::Recv(void* buf, size_t len, int flags, int* out_len) {
   return RecvFrom(buf, len, flags, NULL, 0, out_len);
 }
@@ skipping 140 matching lines @@
   if (local_addr_ != 0) {
     *len = ResourceToSockAddr(local_addr_, *len, addr);
     return 0;
   }
 
   return ENOTCONN;
 }
 
 }  // namespace nacl_io
 
-#endif  // PROVIDES_SOCKET_API
+#endif  // PROVIDES_SOCKET_API