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/****************************************************************************
* net/sendto.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <arch/irq.h>
#include "net_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct sendto_s
{
sem_t st_sem;
uint16 st_buflen;
const char *st_buffer;
};
/****************************************************************************
* Private Functions
****************************************************************************/
void sendto_interrupt(void *private)
{
struct sendto_s *pstate = (struct sendto_s *)private;
if (private)
{
/* Copy the user data into appdata and send it */
memcpy(uip_appdata, pstate->st_buffer, pstate->st_buflen);
uip_udp_send(pstate->st_buflen);
/* Don't allow any furhter call backs. */
uip_conn->private = NULL;
uip_conn->callback = NULL;
/* Wake up the waiting thread */
sem_post(&pstate->st_sem);
}
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* 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, const void *buf, size_t len, int flags,
const struct sockaddr *to, socklen_t tolen)
{
FAR struct socket *psock;
#ifdef CONFIG_NET_IPv6
FAR const struct sockaddr_in6 *into = (const struct sockaddr_in6 *)to;
#else
FAR const struct sockaddr_in *into = (const struct sockaddr_in *)to;
#endif
#ifdef CONFIG_NET_UDP
struct uip_udp_conn *udp_conn;
struct sendto_s state;
irqstate_t save;
#endif
int err;
int ret;
/* If to is NULL or tolen is zero, then this function is same as send */
if (!to || !tolen)
{
return send(sockfd, buf, len, flags);
}
/* Verify that a valid address has been provided */
#ifdef CONFIG_NET_IPv6
if (to->sa_family != AF_INET6 || tolen < sizeof(struct sockaddr_in6))
#else
if (to->sa_family != AF_INET || tolen < sizeof(struct sockaddr_in))
#endif
{
err = EBADF;
goto errout;
}
/* Get the underlying socket structure */
/* Verify that the sockfd corresponds to valid, allocated socket */
psock = sockfd_socket(sockfd);
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* If this is a connected socket, then return EISCONN */
if (psock->s_type != SOCK_DGRAM)
{
err = EISCONN;
goto errout;
}
/* Perform the UDP sendto operation */
#ifdef CONFIG_NET_UDP
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = irqsave();
memset(&state, 0, sizeof(struct sendto_s));
sem_init(&state.st_sem, 0, 0);
state.st_buflen = len;
state.st_buffer = buf;
/* Setup the UDP socket */
ret = uip_udpconnect(psock->s_conn, into);
if (ret < 0)
{
irqrestore(save);
err = -ret;
goto errout;
}
/* Set up the callback in the connection */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = (void*)&state;
udp_conn->callback = sendto_interrupt;
irqrestore(save);
sem_wait(&state.st_sem);
sem_destroy(&state.st_sem);
return len;
#else
err = ENOSYS;
#endif
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
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