Update comments of the Pepper networking APIs.

ppapi/cpp/dev/udp_socket_dev.h

 // Copyright 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.
 
 #ifndef PPAPI_CPP_DEV_UDP_SOCKET_DEV_H_
 #define PPAPI_CPP_DEV_UDP_SOCKET_DEV_H_
 
 #include "ppapi/c/dev/ppb_udp_socket_dev.h"
 #include "ppapi/cpp/dev/net_address_dev.h"
 #include "ppapi/cpp/pass_ref.h"
 #include "ppapi/cpp/resource.h"
 
 namespace pp {
 
 class CompletionCallback;
 class InstanceHandle;
 class Var;
 
 template <typename T> class CompletionCallbackWithOutput;
 
+/// The <code>UDPSocket_Dev</code> class provides UDP socket operations.
+///
+/// Permissions: Apps permission <code>socket</code> with subrule
+/// <code>udp-bind</code> is required for <code>Bind()</code>; subrule
+/// <code>udp-send-to</code> is required for <code>SendTo()</code>.
+/// For more details about network communication permissions, please see:
+/// http://developer.chrome.com/apps/app_network.html
 class UDPSocket_Dev: public Resource {
  public:
+  /// Default constructor for creating an is_null() <code>UDPSocket_Dev</code>
+  /// object.
   UDPSocket_Dev();
 
+  /// A contructor used to create a <code>UDPSocket_Dev</code> object.
+  ///
+  /// @param[in] instance The instance with which this resource will be
+  /// associated.
   explicit UDPSocket_Dev(const InstanceHandle& instance);
 
+  /// A constructor used when you have received a <code>PP_Resource</code> as a
+  /// return value that has already been added 1 ref for you.
+  ///
+  /// @param[in] resource A <code>PPB_UDPSocket_Dev</code> resource.
   UDPSocket_Dev(PassRef, PP_Resource resource);
 
+  /// The copy constructor for <code>UDPSocket_Dev</code>.
+  ///
+  /// @param[in] other A reference to another <code>UDPSocket_Dev</code>.
   UDPSocket_Dev(const UDPSocket_Dev& other);
 
+  /// The destructor.
   virtual ~UDPSocket_Dev();
 
+  /// The assign operator for <code>UDPSocket_Dev</code>.
+  ///
+  /// @param[in] other A reference to another <code>UDPSocket_Dev</code>.
+  ///
+  /// @return A reference to this <code>UDPSocket_Dev</code> object.
   UDPSocket_Dev& operator=(const UDPSocket_Dev& other);
 
-  // Returns true if the required interface is available.
+  /// Static function for determining whether the browser supports the required
+  /// <code>PPB_UDPSocket_Dev</code> interface.
+  ///
+  /// @return true if the interface is available, false otherwise.
   static bool IsAvailable();
 
+  /// Binds to the given address.
+  ///
+  /// @param[in] addr A <code>NetAddress_Dev</code> object.
+  /// @param[in] callback A <code>CompletionCallback</code> to be called upon
+  /// completion.
+  ///
+  /// @return An int32_t containing an error code from <code>pp_errors.h</code>.
+  /// <code>PP_ERROR_NOACCESS</code> will be returned if the caller doesn't have
+  /// required permissions. <code>PP_ERROR_ADDRESS_IN_USE</code> will be
+  /// returned if the address is already in use.
   int32_t Bind(const NetAddress_Dev& addr,
                const CompletionCallback& callback);
+
+  /// Get the address that the socket has bound to. It can only be called after
+  /// a successful <code>Bind()</code> call.
+  ///
+  /// @return A <code>NetAddress_Dev</code> object. The object will be null
+  /// (i.e., is_null() returns true) on failure.
   NetAddress_Dev GetBoundAddress();
+
+  /// Receives data from the socket and stores the source address. It can only
+  /// be called after a successful <code>Bind()</code> call.
+  ///
+  /// <strong>Caveat:</strong> You should be careful about the lifetime of
+  /// <code>buffer</code>. Typically you will use a
+  /// <code>CompletionCallbackFactory</code> to scope callbacks to the lifetime
+  /// of your class. When your class goes out of scope, the callback factory
+  /// will not actually cancel the operation, but will rather just skip issuing
+  /// the callback on your class. This means that if the underlying
+  /// <code>PPB_UDPSocket_Dev</code> resource outlives your class, the browser
+  /// will still try to write into your buffer when the operation completes.
+  /// The buffer must be kept valid until then to avoid memory corruption.
+  /// If you want to release the buffer while the <code>RecvFrom()</code> call
+  /// is still pending, you should call <code>Close()</code> to ensure that the
+  /// buffer won't be accessed in the future.
+  ///
+  /// @param[out] buffer The buffer to store the received data on success. It
+  /// must be at least <code>num_bytes</code> big.
+  /// @param[in] num_bytes The number of bytes to read.
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code> to be
+  /// called upon completion.
+  ///
+  /// @return A non-negative number on success to indicate how many bytes have
+  /// been received; otherwise, an error code from <code>pp_errors.h</code>.
   int32_t RecvFrom(
       char* buffer,
       int32_t num_bytes,
       const CompletionCallbackWithOutput<NetAddress_Dev>& callback);
+
+  /// Sends data to a specific destination. It can only be called after a
+  /// successful <code>Bind()</code> call.
+  ///
+  /// @param[in] buffer The buffer containing the data to send.
+  /// @param[in] num_bytes The number of bytes to send.
+  /// @param[in] addr A <code>NetAddress_Dev</code> object holding the
+  /// target address.
+  /// @param[in] callback A <code>CompletionCallback</code> to be called upon
+  /// completion.
+  ///
+  /// @return A non-negative number on success to indicate how many bytes have
+  /// been sent; otherwise, an error code from <code>pp_errors.h</code>.
+  /// <code>PP_ERROR_NOACCESS</code> will be returned if the caller doesn't have
+  /// required permissions.
   int32_t SendTo(const char* buffer,
                  int32_t num_bytes,
                  const NetAddress_Dev& addr,
                  const CompletionCallback& callback);
+
+  /// Cancels all pending reads and writes, and closes the socket. Any pending
+  /// callbacks will still run, reporting <code>PP_ERROR_ABORTED</code> if
+  /// pending IO was interrupted. After a call to this method, any output
+  /// paramters passed into previous <code>RecvFrom()</code> calls won't be
+  /// accessed. It is not valid to call <code>Bind()</code> again.
+  ///
+  /// The socket is implicitly closed if it is destroyed, so you are not
+  /// required to call this method.
   void Close();
+
+  /// Sets a socket option on the UDP socket.
+  /// Please see the <code>PP_UDPSocket_Option_Dev</code> description for option
+  /// names, value types and allowed values.
+  ///
+  /// @param[in] name The option type to set.
+  /// @param[in] value The option value to set.
+  /// @param[in] callback A <code>CompletionCallback</code> to be called upon
+  /// completion.
+  ///
+  /// @return An int32_t containing an error code from <code>pp_errors.h</code>.
   int32_t SetOption(PP_UDPSocket_Option_Dev name,
                     const Var& value,
                     const CompletionCallback& callback);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_UDP_SOCKET_DEV_H_