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+/****************************************************************************
+ * net/sendto.c
+ *
+ * Copyright (C) 2007-2009, 2011-2012 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>
+#ifdef CONFIG_NET
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+#include <arch/irq.h>
+#include <nuttx/net/uip/uip-arch.h>
+
+#include "net_internal.h"
+#include "uip/uip_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct sendto_s
+{
+ FAR struct uip_callback_s *st_cb; /* Reference to callback instance */
+ sem_t st_sem; /* Semaphore signals sendto completion */
+ uint16_t st_buflen; /* Length of send buffer (error if <0) */
+ const char *st_buffer; /* Pointer to send buffer */
+ int st_sndlen; /* Result of the send (length sent or negated errno) */
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: sendto_interrupt
+ *
+ * Description:
+ * This function is called from the interrupt level to perform the actual
+ * send operation when polled by the uIP layer.
+ *
+ * Parameters:
+ * dev The sructure of the network driver that caused the interrupt
+ * conn An instance of the UDP connection structure cast to void *
+ * pvpriv An instance of struct sendto_s cast to void*
+ * flags Set of events describing why the callback was invoked
+ *
+ * Returned Value:
+ * Modified value of the input flags
+ *
+ * Assumptions:
+ * Running at the interrupt level
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_UDP
+static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn,
+ void *pvpriv, uint16_t flags)
+{
+ struct sendto_s *pstate = (struct sendto_s *)pvpriv;
+
+ nllvdbg("flags: %04x\n", flags);
+ if (pstate)
+ {
+ /* Check if the outgoing packet is available (it may have been claimed
+ * by a sendto interrupt serving a different thread -OR- if the output
+ * buffer currently contains unprocessed incoming data. In these cases
+ * we will just have to wait for the next polling cycle.
+ */
+
+ if (dev->d_sndlen > 0 || (flags & UIP_NEWDATA) != 0)
+ {
+ /* Another thread has beat us sending data or the buffer is busy,
+ * wait for the next polling cycle
+ */
+
+ return flags;
+ }
+
+ /* It looks like we are good to send the data */
+
+ else
+ {
+ /* Copy the user data into d_snddata and send it */
+
+ uip_send(dev, pstate->st_buffer, pstate->st_buflen);
+ pstate->st_sndlen = pstate->st_buflen;
+ }
+
+ /* Don't allow any further call backs. */
+
+ pstate->st_cb->flags = 0;
+ pstate->st_cb->priv = NULL;
+ pstate->st_cb->event = NULL;
+
+ /* Wake up the waiting thread */
+
+ sem_post(&pstate->st_sem);
+ }
+
+ return flags;
+}
+#endif
+
+/****************************************************************************
+ * Global 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)
+{
+#ifdef CONFIG_NET_UDP
+ FAR struct uip_udp_conn *conn;
+#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
+ struct sendto_s state;
+ uip_lock_t save;
+ int ret;
+#endif
+ int err;
+
+ /* If to is NULL or tolen is zero, then this function is same as send (for
+ * connected socket types)
+ */
+
+ if (!to || !tolen)
+ {
+#ifdef CONFIG_NET_TCP
+ return psock_send(psock, buf, len, flags);
+#else
+ err = EINVAL;
+ goto errout;
+#endif
+ }
+
+ /* 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;
+ }
+
+ /* Verify that the psock corresponds to valid, allocated socket */
+
+ 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
+ /* Set the socket state to sending */
+
+ psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
+
+ /* Initialize the state structure. This is done with interrupts
+ * disabled because we don't want anything to happen until we
+ * are ready.
+ */
+
+ save = uip_lock();
+ 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 */
+
+ conn = (struct uip_udp_conn *)psock->s_conn;
+ ret = uip_udpconnect(conn, into);
+ if (ret < 0)
+ {
+ uip_unlock(save);
+ err = -ret;
+ goto errout;
+ }
+
+ /* Set up the callback in the connection */
+
+ state.st_cb = uip_udpcallbackalloc(conn);
+ if (state.st_cb)
+ {
+ state.st_cb->flags = UIP_POLL;
+ state.st_cb->priv = (void*)&state;
+ state.st_cb->event = sendto_interrupt;
+
+ /* Enable the UDP socket */
+
+ uip_udpenable(conn);
+
+ /* Notify the device driver of the availabilty of TX data */
+
+ netdev_txnotify(&conn->ripaddr);
+
+ /* Wait for either the receive to complete or for an error/timeout to occur.
+ * NOTES: (1) uip_lockedwait will also terminate if a signal is received, (2)
+ * interrupts may be disabled! They will be re-enabled while the task sleeps
+ * and automatically re-enabled when the task restarts.
+ */
+
+ uip_lockedwait(&state.st_sem);
+
+ /* Make sure that no further interrupts are processed */
+
+ uip_udpdisable(conn);
+ uip_udpcallbackfree(conn, state.st_cb);
+ }
+ uip_unlock(save);
+
+ sem_destroy(&state.st_sem);
+
+ /* Set the socket state to idle */
+
+ psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
+
+ /* Check for errors */
+
+ if (state.st_sndlen < 0)
+ {
+ err = -state.st_sndlen;
+ goto errout;
+ }
+
+ /* Sucess */
+
+ return state.st_sndlen;
+#else
+ err = ENOSYS;
+#endif
+
+errout:
+ errno = err;
+ 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;
+
+ /* Get the underlying socket structure */
+
+ psock = sockfd_socket(sockfd);
+
+ /* And let psock_sendto do all of the work */
+
+ return psock_sendto(psock, buf, len, flags, to, tolen);
+}
+
+#endif /* CONFIG_NET */
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