314 lines
9.7 KiB
C
314 lines
9.7 KiB
C
/****************************************************************************
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* net/socket/send.c
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*
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* Copyright (C) 2007-2014, 2016 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <nuttx/cancelpt.h>
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#include "pkt/pkt.h"
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#include "tcp/tcp.h"
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#include "udp/udp.h"
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#include "sixlowpan/sixlowpan.h"
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#include "local/local.h"
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#include "socket/socket.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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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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{
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int ret;
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/* Treat as a cancellation point */
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(void)enter_cancellation_point();
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switch (psock->s_type)
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{
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#if defined(CONFIG_NET_PKT)
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case SOCK_RAW:
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{
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/* Raw packet send */
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ret = psock_pkt_send(psock, buf, len);
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}
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break;
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#endif
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#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM)
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case SOCK_STREAM:
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{
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#ifdef CONFIG_NET_LOCAL_STREAM
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#ifdef CONFIG_NET_TCP
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if (psock->s_domain == PF_LOCAL)
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#endif
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{
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/* Local TCP packet send */
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ret = psock_local_send(psock, buf, len, flags);
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}
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#endif /* CONFIG_NET_LOCAL_STREAM */
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#ifdef CONFIG_NET_TCP
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#ifdef CONFIG_NET_LOCAL_STREAM
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else
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#endif
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{
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#ifdef CONFIG_NET_6LOWPAN
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/* Try 6loWPAN TCP packet send */
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ret = psock_6lowpan_tcp_send(psock, buf, len);
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if (ret < 0)
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#endif
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{
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/* Try TCP/IP packet send */
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ret = psock_tcp_send(psock, buf, len);
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}
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}
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#endif /* CONFIG_NET_TCP */
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}
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break;
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#endif /* CONFIG_NET_TCP || CONFIG_NET_LOCAL_STREAM */
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#ifdef CONFIG_NET_UDP
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case SOCK_DGRAM:
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{
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#ifdef CONFIG_NET_LOCAL_DGRAM
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#ifdef CONFIG_NET_UDP
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if (psock->s_domain == PF_LOCAL)
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#endif
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{
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/* Local UDP packet send */
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#warning Missing logic
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ret = -ENOSYS;
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}
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#endif /* CONFIG_NET_LOCAL_DGRAM */
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#ifdef CONFIG_NET_UDP
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#ifdef CONFIG_NET_LOCAL_DGRAM
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else
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#endif
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{
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#ifdef CONFIG_NET_6LOWPAN
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/* Try 6loWPAN UDP packet send */
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ret = psock_6lowpan_udp_send(psock, buf, len);
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if (ret < 0)
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#endif
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{
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/* UDP/IP packet send */
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ret = psock_udp_send(psock, buf, len);
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}
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}
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#endif /* CONFIG_NET_UDP */
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}
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break;
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#endif /* CONFIG_NET_UDP */
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default:
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{
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/* EDESTADDRREQ. Signifies that the socket is not connection-mode
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* and no peer address is set.
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*/
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ret = -EDESTADDRREQ;
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}
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break;
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}
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leave_cancellation_point();
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return ret;
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}
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/****************************************************************************
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* Function: 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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* sockfd Socket descriptor of socket
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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 send(int sockfd, FAR const void *buf, size_t len, int flags)
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{
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FAR struct socket *psock;
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ssize_t ret;
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/* send() is a cancellation point */
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(void)enter_cancellation_point();
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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/* And let psock_send do all of the work */
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ret = psock_send(psock, buf, len, flags);
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leave_cancellation_point();
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return ret;
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}
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