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63 lines
2.8 KiB
C
63 lines
2.8 KiB
C
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// Copyright 2017 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_OPTIONS_H_
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#define NET_SOCKET_SOCKET_OPTIONS_H_
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#include <stdint.h>
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#include "net/base/net_export.h"
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#include "net/socket/socket_descriptor.h"
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namespace net {
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// This function enables/disables buffering in the kernel. By default, on Linux,
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// TCP sockets will wait up to 200ms for more data to complete a packet before
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// transmitting. After calling this function, the kernel will not wait. See
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// TCP_NODELAY in `man 7 tcp`.
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//
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// For Windows:
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//
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// The Nagle implementation on Windows is governed by RFC 896. The idea
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// behind Nagle is to reduce small packets on the network. When Nagle is
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// enabled, if a partial packet has been sent, the TCP stack will disallow
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// further *partial* packets until an ACK has been received from the other
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// side. Good applications should always strive to send as much data as
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// possible and avoid partial-packet sends. However, in most real world
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// applications, there are edge cases where this does not happen, and two
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// partial packets may be sent back to back. For a browser, it is NEVER
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// a benefit to delay for an RTT before the second packet is sent.
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//
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// As a practical example in Chromium today, consider the case of a small
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// POST. I have verified this:
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// Client writes 649 bytes of header (partial packet #1)
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// Client writes 50 bytes of POST data (partial packet #2)
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// In the above example, with Nagle, a RTT delay is inserted between these
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// two sends due to nagle. RTTs can easily be 100ms or more. The best
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// fix is to make sure that for POSTing data, we write as much data as
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// possible and minimize partial packets. We will fix that. But disabling
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// Nagle also ensure we don't run into this delay in other edge cases.
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// See also:
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// http://technet.microsoft.com/en-us/library/bb726981.aspx
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//
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// SetTCPNoDelay() sets the TCP_NODELAY option. Use |no_delay| to enable or
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// disable it. On error returns a net error code, on success returns OK.
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int SetTCPNoDelay(SocketDescriptor fd, bool no_delay);
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// SetReuseAddr() sets the SO_REUSEADDR socket option. Use |reuse| to enable or
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// disable it. On error returns a net error code, on success returns OK.
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int SetReuseAddr(SocketDescriptor fd, bool reuse);
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// SetSocketReceiveBufferSize() sets the SO_RCVBUF socket option. On error
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// returns a net error code, on success returns OK.
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int SetSocketReceiveBufferSize(SocketDescriptor fd, int32_t size);
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// SetSocketSendBufferSize() sets the SO_SNDBUF socket option. On error
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// returns a net error code, on success returns OK.
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int SetSocketSendBufferSize(SocketDescriptor fd, int32_t size);
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} // namespace net
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#endif // NET_SOCKET_SOCKET_OPTIONS_H_
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