Add Socket::ReadIfReady()

net/socket/tcp_socket_posix.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 NET_SOCKET_TCP_SOCKET_POSIX_H_
 #define NET_SOCKET_TCP_SOCKET_POSIX_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 42 matching lines @@
              IPEndPoint* address,
              const CompletionCallback& callback);
 
   int Connect(const IPEndPoint& address, const CompletionCallback& callback);
   bool IsConnected() const;
   bool IsConnectedAndIdle() const;
 
   // Multiple outstanding requests are not supported.
   // Full duplex mode (reading and writing at the same time) is supported.
   int Read(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
+  int ReadIfReady(IOBuffer* buf,
+                  int buf_len,
+                  const CompletionCallback& callback);
   int Write(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
 
   int GetLocalAddress(IPEndPoint* address) const;
   int GetPeerAddress(IPEndPoint* address) const;
 
   // Sets various socket options.
   // The commonly used options for server listening sockets:
   // - SetAddressReuse(true).
   int SetDefaultOptionsForServer();
   // The commonly used options for client sockets and accepted sockets:
@@ skipping 120 matching lines @@
                           IPEndPoint* address);
 
   void ConnectCompleted(const CompletionCallback& callback, int rv);
   int HandleConnectCompleted(int rv);
   void LogConnectBegin(const AddressList& addresses) const;
   void LogConnectEnd(int net_error) const;
 
   void ReadCompleted(const scoped_refptr<IOBuffer>& buf,
                      const CompletionCallback& callback,
                      int rv);
+  void ReadIfReadyCompleted(const CompletionCallback& callback, int rv);
   int HandleReadCompleted(IOBuffer* buf, int rv);
 
   void WriteCompleted(const scoped_refptr<IOBuffer>& buf,
                       const CompletionCallback& callback,
                       int rv);
   int HandleWriteCompleted(IOBuffer* buf, int rv);
   int TcpFastOpenWrite(IOBuffer* buf,
                        int buf_len,
                        const CompletionCallback& callback);
 
@@ skipping 36 matching lines @@
   bool logging_multiple_connect_attempts_;
 
   NetLogWithSource net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(TCPSocketPosix);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SOCKET_POSIX_H_