425 lines
14 KiB
C
425 lines
14 KiB
C
/****************************************************************************
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* net/socket/socket.h
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*
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* Copyright (C) 2007-2009, 2011-2014 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 _NET_SOCKET_SOCKET_H
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#define _NET_SOCKET_SOCKET_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifdef CONFIG_NET
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#include <sys/types.h>
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#include <stdint.h>
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#include <time.h>
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#include <nuttx/net/net.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Definitions of 8-bit socket flags */
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/* Bits 0-2: Socket state */
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#define _SF_IDLE 0x00 /* - There is no socket activity */
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#define _SF_ACCEPT 0x01 /* - Socket is waiting to accept a connection */
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#define _SF_RECV 0x02 /* - Waiting for recv action to complete */
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#define _SF_SEND 0x03 /* - Waiting for send action to complete */
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#define _SF_MASK 0x03 /* - Mask to isolate the above actions */
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#define _SF_NONBLOCK 0x08 /* Bit 3: Don't block if no data (TCP/READ only) */
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#define _SF_LISTENING 0x10 /* Bit 4: SOCK_STREAM is listening */
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#define _SF_BOUND 0x20 /* Bit 5: SOCK_STREAM is bound to an address */
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/* Bits 6-7: Connection state */
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#define _SF_CONNECTED 0x40 /* Bit 6: SOCK_STREAM is connected */
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#define _SF_CLOSED 0x80 /* Bit 7: SOCK_STREAM was gracefully disconnected */
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/* Connection state encoding:
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*
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* _SF_CONNECTED==1 && _SF_CLOSED==0 - the socket is connected
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* _SF_CONNECTED==0 && _SF_CLOSED==1 - the socket was gracefully disconnected
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* _SF_CONNECTED==0 && _SF_CLOSED==0 - the socket was rudely disconnected
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*/
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/* Macro to manage the socket state and flags */
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#define _SS_SETSTATE(s,f) (((s) & ~_SF_MASK) | (f))
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#define _SS_GETSTATE(s) ((s) & _SF_MASK)
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#define _SS_ISBUSY(s) (_SS_GETSTATE(s) != _SF_IDLE)
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#define _SS_ISNONBLOCK(s) (((s) & _SF_NONBLOCK) != 0)
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#define _SS_ISLISTENING(s) (((s) & _SF_LISTENING) != 0)
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#define _SS_ISBOUND(s) (((s) & _SF_CONNECTED) != 0)
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#define _SS_ISCONNECTED(s) (((s) & _SF_CONNECTED) != 0)
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#define _SS_ISCLOSED(s) (((s) & _SF_CLOSED) != 0)
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/* This macro converts a socket option value into a bit setting */
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#define _SO_BIT(o) (1 << (o))
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/* These define bit positions for each socket option (see sys/socket.h) */
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#define _SO_DEBUG _SO_BIT(SO_DEBUG)
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#define _SO_ACCEPTCONN _SO_BIT(SO_ACCEPTCONN)
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#define _SO_BROADCAST _SO_BIT(SO_BROADCAST)
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#define _SO_REUSEADDR _SO_BIT(SO_REUSEADDR)
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#define _SO_KEEPALIVE _SO_BIT(SO_KEEPALIVE)
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#define _SO_LINGER _SO_BIT(SO_LINGER)
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#define _SO_OOBINLINE _SO_BIT(SO_OOBINLINE)
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#define _SO_SNDBUF _SO_BIT(SO_SNDBUF)
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#define _SO_RCVBUF _SO_BIT(SO_RCVBUF)
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#define _SO_ERROR _SO_BIT(SO_ERROR)
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#define _SO_TYPE _SO_BIT(SO_TYPE)
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#define _SO_DONTROUTE _SO_BIT(SO_DONTROUTE)
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#define _SO_RCVLOWAT _SO_BIT(SO_RCVLOWAT)
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#define _SO_RCVTIMEO _SO_BIT(SO_RCVTIMEO)
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#define _SO_SNDLOWAT _SO_BIT(SO_SNDLOWAT)
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#define _SO_SNDTIMEO _SO_BIT(SO_SNDTIMEO)
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/* This is the larget option value */
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#define _SO_MAXOPT (15)
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/* Macros to set, test, clear options */
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#define _SO_SETOPT(s,o) ((s) |= _SO_BIT(o))
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#define _SO_CLROPT(s,o) ((s) &= ~_SO_BIT(o))
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#define _SO_GETOPT(s,o) (((s) & _SO_BIT(o)) != 0)
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/* These are macros that can be used to determine if socket option code is
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* valid (in range) and supported by API.
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*/
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#define _SO_GETONLYSET (_SO_ACCEPTCONN|_SO_ERROR|_SO_TYPE)
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#define _SO_GETONLY(o) ((_SO_BIT(o) & _SO_GETONLYSET) != 0)
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#define _SO_GETVALID(o) (((unsigned int)(o)) <= _SO_MAXOPT)
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#define _SO_SETVALID(o) ((((unsigned int)(o)) <= _SO_MAXOPT) && !_SO_GETONLY(o))
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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struct tcp_conn_s; /* Forward reference */
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#endif
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/****************************************************************************
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* Name: sockfd_allocate
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*
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* Description:
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* Allocate a socket descriptor
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*
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* Input Parameters:
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* Lowest socket descriptor index to be used.
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*
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* Returned Value:
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* On success, a socket descriptor >= minsd is returned. A negated errno
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* value is returned on failure.
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*
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****************************************************************************/
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int sockfd_allocate(int minsd);
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/****************************************************************************
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* Name: sock_release
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*
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* Description:
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* Free a socket.
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*
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* Input Parameters:
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* psock - A reference to the socket instance to be freed.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sock_release(FAR struct socket *psock);
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/****************************************************************************
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* Name: sockfd_release
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*
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* Description:
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* Free the socket by its socket descriptor.
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*
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* Input Parameters:
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* sockfd - Socket descriptor identifies the socket to be released.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void sockfd_release(int sockfd);
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/****************************************************************************
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* Name: sockfd_socket
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*
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* Description:
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* Given a socket descriptor, return the underlying socket structure.
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*
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* Input Parameters:
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* sockfd - The socket descriptor index o use.
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*
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* Returned Value:
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* On success, a reference to the socket structure associated with the
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* the socket descriptor is returned. NULL is returned on any failure.
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*
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****************************************************************************/
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FAR struct socket *sockfd_socket(int sockfd);
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/****************************************************************************
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* Name: net_startmonitor
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*
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* Description:
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* Set up to receive TCP connection state changes for a given socket
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*
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* Input Parameters:
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* psock - The socket of interest
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*
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* Returned Value:
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* On success, net_startmonitor returns OK; On any failure,
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* net_startmonitor will return a negated errno value. The only failure
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* that can occur is if the socket has already been closed and, in this
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* case, -ENOTCONN is returned.
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*
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* Assumptions:
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* The caller holds the network lock (if not, it will be locked momentarily
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* by this function).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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int net_startmonitor(FAR struct socket *psock);
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#endif
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/****************************************************************************
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* Name: net_stopmonitor
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*
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* Description:
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* Stop monitoring TCP connection changes for a given socket
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*
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* Input Parameters:
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* conn - The TCP connection of interest
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The caller holds the network lock (if not, it will be locked momentarily
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* by this function).
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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void net_stopmonitor(FAR struct tcp_conn_s *conn);
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#endif
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/****************************************************************************
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* Name: net_lostconnection
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*
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* Description:
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* Called when a loss-of-connection event has occurred.
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*
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* Parameters:
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* psock The TCP socket structure associated.
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* flags Set of connection events events
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The caller holds the network lock.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_TCP
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void net_lostconnection(FAR struct socket *psock, uint16_t flags);
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#endif
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/****************************************************************************
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* Function: psock_close
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*
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* Description:
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* Performs the close operation on a socket instance
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*
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* Parameters:
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* psock Socket instance
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately.
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*
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* Assumptions:
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*
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****************************************************************************/
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int psock_close(FAR struct socket *psock);
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/****************************************************************************
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* Function: net_close
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*
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* Description:
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* Performs the close operation on socket descriptors
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*
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* Parameters:
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* sockfd Socket descriptor of socket
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*
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* Returned Value:
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* 0 on success; -1 on error with errno set appropriately.
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*
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* Assumptions:
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*
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****************************************************************************/
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int net_close(int sockfd);
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/****************************************************************************
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* Function: net_timeo
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*
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* Description:
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* Check if a timeout has elapsed. This can be called from a socket poll
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* function to determine if a timeout has occurred.
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*
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* Parameters:
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* start_time Timeout start time in system clock ticks
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* timeout Timeout value in deciseconds.
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*
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* Returned Value:
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* 0 (FALSE) if not timeout; 1 (TRUE) if timeout
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*
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* Assumptions:
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*
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****************************************************************************/
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#ifdef CONFIG_NET_SOCKOPTS
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int net_timeo(uint32_t start_time, socktimeo_t timeo);
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#endif
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/****************************************************************************
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* Function: psock_send
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*
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* Description:
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* The send() call may be used only when the socket is in a connected state
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* (so that the intended recipient is known). The only difference between
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* send() and write() is the presence of flags. With zero flags parameter,
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* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
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* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
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*
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* Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EOPNOTSUPP
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* Some bit in the flags argument is inappropriate for the socket
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* type.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
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int flags);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* CONFIG_NET */
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#endif /* _NET_SOCKET_SOCKET_H */
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