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82 lines
3.8 KiB
C++
82 lines
3.8 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_SOCKET_SOCKET_H_
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#define NET_SOCKET_SOCKET_H_
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#include <stdint.h>
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#include "base/feature_list.h"
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#include "net/base/completion_callback.h"
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#include "net/base/net_export.h"
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namespace net {
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class IOBuffer;
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// Represents a read/write socket.
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class NET_EXPORT Socket {
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public:
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// Name of the field trial for using ReadyIfReady() instead of Read().
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static const base::Feature kReadIfReadyExperiment;
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virtual ~Socket() {}
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// Reads data, up to |buf_len| bytes, from the socket. The number of bytes
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// read is returned, or an error is returned upon failure.
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// ERR_SOCKET_NOT_CONNECTED should be returned if the socket is not currently
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// connected. Zero is returned once to indicate end-of-file; the return value
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// of subsequent calls is undefined, and may be OS dependent. ERR_IO_PENDING
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// is returned if the operation could not be completed synchronously, in which
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// case the result will be passed to the callback when available. If the
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// operation is not completed immediately, the socket acquires a reference to
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// the provided buffer until the callback is invoked or the socket is
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// closed. If the socket is Disconnected before the read completes, the
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// callback will not be invoked.
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virtual int Read(IOBuffer* buf, int buf_len,
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const CompletionCallback& callback) = 0;
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// Reads data, up to |buf_len| bytes, into |buf| without blocking. Default
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// implementation returns ERR_READ_IF_READY_NOT_IMPLEMENTED. Caller should
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// fall back to Read() if receives ERR_READ_IF_READY_NOT_IMPLEMENTED.
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// Upon synchronous completion, returns the number of bytes read, or 0 on EOF,
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// or an error code if an error happens. If read cannot be completed
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// synchronously, returns ERR_IO_PENDING and does not hold on to |buf|.
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// |callback| will be invoked with OK when data can be read, at which point,
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// caller can call ReadIfReady() again. If an error occurs asynchronously,
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// |callback| will be invoked with the error code.
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virtual int ReadIfReady(IOBuffer* buf,
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int buf_len,
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const CompletionCallback& callback);
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// Writes data, up to |buf_len| bytes, to the socket. Note: data may be
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// written partially. The number of bytes written is returned, or an error
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// is returned upon failure. ERR_SOCKET_NOT_CONNECTED should be returned if
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// the socket is not currently connected. The return value when the
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// connection is closed is undefined, and may be OS dependent. ERR_IO_PENDING
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// is returned if the operation could not be completed synchronously, in which
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// case the result will be passed to the callback when available. If the
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// operation is not completed immediately, the socket acquires a reference to
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// the provided buffer until the callback is invoked or the socket is
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// closed. Implementations of this method should not modify the contents
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// of the actual buffer that is written to the socket. If the socket is
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// Disconnected before the write completes, the callback will not be invoked.
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virtual int Write(IOBuffer* buf, int buf_len,
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const CompletionCallback& callback) = 0;
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// Set the receive buffer size (in bytes) for the socket.
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// Note: changing this value can affect the TCP window size on some platforms.
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// Returns a net error code.
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virtual int SetReceiveBufferSize(int32_t size) = 0;
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// Set the send buffer size (in bytes) for the socket.
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// Note: changing this value can affect the TCP window size on some platforms.
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// Returns a net error code.
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virtual int SetSendBufferSize(int32_t size) = 0;
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};
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} // namespace net
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#endif // NET_SOCKET_SOCKET_H_
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