251924a734
net/tcp: Add logic to send probes when SO_KEEPALIVE is enabled.
net/tcp: TCP socket should not have to be connected to configure KeepAlive.
net/: Add a separate configuration to enable/disable KEEPALIVE socket options.
net/tcp: Arguments to TCP keep-alive timing functions probably should be struct timeval as are the times for other time-related socket options.
net/tcp: Fix a backward conditional
net/tcp: Add some more checks and debug output to TCP-protocol socket options.
net/tcp: Cosmetic changes to some alignment.
net/: Adds socket options needed to manage TCP-keepalive and TCP state machine logic to detect if that the remote peer is alive. Still missing the timer poll logic to send the keep-alive probes and the state machine logic to respond to probes.
73 lines
3.3 KiB
C
73 lines
3.3 KiB
C
/****************************************************************************
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* include/netinet/tcp.h
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*
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* Copyright (C) 2017-2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NETINET_TCP_H
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#define __INCLUDE_NETINET_TCP_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/socket.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Per OpenGroup.org:
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*
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* "The netinet/tcp.h header shall define the following macro for use as a
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* socket option at the IPPROTO_TCP level:" -- OpenGroup.org
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*/
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#define TCP_NODELAY (__SO_PROTOCOL + 0) /* Avoid coalescing of small segments. */
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/* "The macro shall be defined in the header. The implementation need not
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* allow the value of the option to be set via setsockopt() or retrieved via
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* getsockopt()."
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*/
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/* Additional TCP protocol socket operations not specified at OpenGroup.org */
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/* TCP protocol socket operations needed to support TCP Keep-Alive: */
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#define TCP_KEEPIDLE (__SO_PROTOCOL + 1) /* Start keeplives after this IDLE period
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* Argument: struct timeval */
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#define TCP_KEEPINTVL (__SO_PROTOCOL + 2) /* Interval between keepalives
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* Argument: struct timeval */
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#define TCP_KEEPCNT (__SO_PROTOCOL + 3) /* Number of keepalives before death
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* Argument: max retry count */
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#endif /* __INCLUDE_NETINET_TCP_H */
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