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nuttx/net/socket/sendto.c

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/****************************************************************************
* net/socket/sendto.c
*
* Copyright (C) 2007-2009, 2011-2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/pthread.h>
#include <nuttx/net/net.h>
#include "udp/udp.h"
#include "local/local.h"
#include "socket/socket.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: psock_sendto
*
* Description:
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
* may be returned when they are not NULL and 0), and the error ENOTCONN is
* returned when the socket was not actually connected.
*
* Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Data to send
* len Length of data to send
* flags Send flags
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN or EWOULDBLOCK
* The socket is marked non-blocking and the requested operation
* would block.
* EBADF
* An invalid descriptor was specified.
* ECONNRESET
* Connection reset by peer.
* EDESTADDRREQ
* The socket is not connection-mode, and no peer address is set.
* EFAULT
* An invalid user space address was specified for a parameter.
* EINTR
* A signal occurred before any data was transmitted.
* EINVAL
* Invalid argument passed.
* EISCONN
* The connection-mode socket was connected already but a recipient
* was specified. (Now either this error is returned, or the recipient
* specification is ignored.)
* EMSGSIZE
* The socket type requires that message be sent atomically, and the
* size of the message to be sent made this impossible.
* ENOBUFS
* The output queue for a network interface was full. This generally
* indicates that the interface has stopped sending, but may be
* caused by transient congestion.
* ENOMEM
* No memory available.
* ENOTCONN
* The socket is not connected, and no target has been given.
* ENOTSOCK
* The argument s is not a socket.
* EOPNOTSUPP
* Some bit in the flags argument is inappropriate for the socket
* type.
* EPIPE
* The local end has been shut down on a connection oriented socket.
* In this case the process will also receive a SIGPIPE unless
* MSG_NOSIGNAL is set.
*
* Assumptions:
*
****************************************************************************/
ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags, FAR const struct sockaddr *to,
socklen_t tolen)
{
socklen_t minlen;
#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM)
ssize_t nsent;
#endif
int errcode;
/* If to is NULL or tolen is zero, then this function is same as send (for
* connected socket types)
*/
if (!to || !tolen)
{
#if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM)
return psock_send(psock, buf, len, flags);
#else
nerr("ERROR: No 'to' address\n");
errcode = EINVAL;
goto errout;
#endif
}
/* Verify that a valid address has been provided */
switch (to->sa_family)
{
#ifdef CONFIG_NET_IPv4
case AF_INET:
minlen = sizeof(struct sockaddr_in);
break;
#endif
#ifdef CONFIG_NET_IPv6
case AF_INET6:
minlen = sizeof(struct sockaddr_in6);
break;
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case AF_LOCAL:
minlen = sizeof(sa_family_t);
break;
#endif
default:
nerr("ERROR: Unrecognized address family: %d\n", to->sa_family);
errcode = EAFNOSUPPORT;
goto errout;
}
if (tolen < minlen)
{
nerr("ERROR: Invalid address length: %d < %d\n", tolen, minlen);
errcode = EBADF;
goto errout;
}
/* Verify that the psock corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
nerr("ERROR: Invalid socket\n");
errcode = EBADF;
goto errout;
}
/* If this is a connected socket, then return EISCONN */
if (psock->s_type != SOCK_DGRAM)
{
nerr("ERROR: Connected socket\n");
errcode = EISCONN;
goto errout;
}
#if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM)
/* Now handle the sendto() operation according to the socket domain,
* currently either IP or Unix domains.
*/
#ifdef CONFIG_NET_LOCAL_DGRAM
#ifdef CONFIG_NET_UDP
if (psock->s_domain == PF_LOCAL)
#endif
{
nsent = psock_local_sendto(psock, buf, len, flags, to, tolen);
}
#endif /* CONFIG_NET_LOCAL_DGRAM */
#ifdef CONFIG_NET_UDP
#ifdef CONFIG_NET_LOCAL_DGRAM
else
#endif
{
nsent = psock_udp_sendto(psock, buf, len, flags, to, tolen);
}
#endif /* CONFIG_NET_UDP */
/* Check if the domain-specific sendto() logic failed */
if (nsent < 0)
{
nerr("ERROR: UDP or Unix domain sendto() failed: %ld\n", (long)nsent);
errcode = -nsent;
goto errout;
}
return nsent;
#else
errcode = ENOSYS;
#endif /* CONFIG_NET_UDP || CONFIG_NET_LOCAL_DGRAM */
errout:
set_errno(errcode);
return ERROR;
}
/****************************************************************************
* Function: sendto
*
* Description:
* If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters to and 'tolen' are ignored (and the error EISCONN
* may be returned when they are not NULL and 0), and the error ENOTCONN is
* returned when the socket was not actually connected.
*
* Parameters:
* sockfd Socket descriptor of socket
* buf Data to send
* len Length of data to send
* flags Send flags
* to Address of recipient
* tolen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN or EWOULDBLOCK
* The socket is marked non-blocking and the requested operation
* would block.
* EBADF
* An invalid descriptor was specified.
* ECONNRESET
* Connection reset by peer.
* EDESTADDRREQ
* The socket is not connection-mode, and no peer address is set.
* EFAULT
* An invalid user space address was specified for a parameter.
* EINTR
* A signal occurred before any data was transmitted.
* EINVAL
* Invalid argument passed.
* EISCONN
* The connection-mode socket was connected already but a recipient
* was specified. (Now either this error is returned, or the recipient
* specification is ignored.)
* EMSGSIZE
* The socket type requires that message be sent atomically, and the
* size of the message to be sent made this impossible.
* ENOBUFS
* The output queue for a network interface was full. This generally
* indicates that the interface has stopped sending, but may be
* caused by transient congestion.
* ENOMEM
* No memory available.
* ENOTCONN
* The socket is not connected, and no target has been given.
* ENOTSOCK
* The argument s is not a socket.
* EOPNOTSUPP
* Some bit in the flags argument is inappropriate for the socket
* type.
* EPIPE
* The local end has been shut down on a connection oriented socket.
* In this case the process will also receive a SIGPIPE unless
* MSG_NOSIGNAL is set.
*
* Assumptions:
*
****************************************************************************/
ssize_t sendto(int sockfd, FAR const void *buf, size_t len, int flags,
FAR const struct sockaddr *to, socklen_t tolen)
{
FAR struct socket *psock;
ssize_t ret;
/* sendto() is a cancellation point */
(void)enter_cancellation_point();
/* Get the underlying socket structure */
psock = sockfd_socket(sockfd);
/* And let psock_sendto do all of the work */
ret = psock_sendto(psock, buf, len, flags, to, tolen);
leave_cancellation_point();
return ret;
}
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