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incubator-nuttx/net/usrsock/usrsock_sendto.c

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/****************************************************************************
* net/usrsock/usrsock_sendto.c
*
* Copyright (C) 2015, 2017 Haltian Ltd. All rights reserved.
* Author: Jussi Kivilinna <jussi.kivilinna@haltian.com>
*
* 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>
#if defined(CONFIG_NET) && defined(CONFIG_NET_USRSOCK)
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <sys/socket.h>
#include <nuttx/net/net.h>
#include <nuttx/net/usrsock.h>
#include "usrsock/usrsock.h"
/****************************************************************************
* Private Functions
****************************************************************************/
static uint16_t sendto_event(FAR struct net_driver_s *dev, FAR void *pvconn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct usrsock_reqstate_s *pstate = pvpriv;
FAR struct usrsock_conn_s *conn = pvconn;
if (flags & USRSOCK_EVENT_ABORT)
{
ninfo("socket aborted.\n");
pstate->result = -ECONNABORTED;
/* Stop further callbacks */
pstate->cb->flags = 0;
pstate->cb->priv = NULL;
pstate->cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->recvsem);
}
else if (flags & USRSOCK_EVENT_REQ_COMPLETE)
{
ninfo("request completed.\n");
pstate->result = conn->resp.result;
if (pstate->result >= 0 || pstate->result == -EAGAIN)
{
/* After reception of data, mark input not ready. Daemon will
* send event to restore this flag.
*/
conn->flags &= ~USRSOCK_EVENT_SENDTO_READY;
}
/* Stop further callbacks */
pstate->cb->flags = 0;
pstate->cb->priv = NULL;
pstate->cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->recvsem);
}
else if (flags & USRSOCK_EVENT_REMOTE_CLOSED)
{
ninfo("remote closed.\n");
pstate->result = -EPIPE;
/* Stop further callbacks */
pstate->cb->flags = 0;
pstate->cb->priv = NULL;
pstate->cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->recvsem);
}
else if (flags & USRSOCK_EVENT_SENDTO_READY)
{
ninfo("sendto ready.\n");
/* Do not let other waiters to claim new data. */
flags &= ~USRSOCK_EVENT_SENDTO_READY;
/* Stop further callbacks */
pstate->cb->flags = 0;
pstate->cb->priv = NULL;
pstate->cb->event = NULL;
/* Wake up the waiting thread */
nxsem_post(&pstate->recvsem);
}
return flags;
}
/****************************************************************************
* Name: do_sendto_request
****************************************************************************/
static int do_sendto_request(FAR struct usrsock_conn_s *conn,
FAR const void *buf, size_t buflen,
FAR const struct sockaddr *addr,
socklen_t addrlen)
{
struct usrsock_request_sendto_s req =
{
};
struct iovec bufs[3];
if (addrlen > UINT16_MAX)
{
addrlen = UINT16_MAX;
}
if (buflen > UINT16_MAX)
{
buflen = UINT16_MAX;
}
/* Prepare request for daemon to read. */
req.head.reqid = USRSOCK_REQUEST_SENDTO;
req.usockid = conn->usockid;
req.addrlen = addrlen;
req.buflen = buflen;
bufs[0].iov_base = (FAR void *)&req;
bufs[0].iov_len = sizeof(req);
bufs[1].iov_base = (FAR void *)addr;
bufs[1].iov_len = addrlen;
bufs[2].iov_base = (FAR void *)buf;
bufs[2].iov_len = buflen;
return usrsockdev_do_request(conn, bufs, ARRAY_SIZE(bufs));
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usrsock_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.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* buf Data to send
* len Length of data to send
* flags Send flags (ignored)
* to Address of recipient
* tolen The length of the address structure
*
****************************************************************************/
ssize_t usrsock_sendto(FAR struct socket *psock, FAR const void *buf,
size_t len, int flags, FAR const struct sockaddr *to,
socklen_t tolen)
{
FAR struct usrsock_conn_s *conn = psock->s_conn;
struct usrsock_reqstate_s state =
{
};
ssize_t ret;
DEBUGASSERT(conn);
net_lock();
if (conn->state == USRSOCK_CONN_STATE_UNINITIALIZED ||
conn->state == USRSOCK_CONN_STATE_ABORTED)
{
/* Invalid state or closed by daemon. */
ninfo("usockid=%d; connect() with uninitialized usrsock.\n",
conn->usockid);
ret = (conn->state == USRSOCK_CONN_STATE_ABORTED) ? -EPIPE :
-ECONNRESET;
goto errout_unlock;
}
if (conn->type == SOCK_STREAM || conn->type == SOCK_SEQPACKET)
{
if (!conn->connected)
{
if (conn->state == USRSOCK_CONN_STATE_CONNECTING)
{
/* Connecting. */
ninfo("usockid=%d; socket still connecting.\n",
conn->usockid);
ret = -EAGAIN;
goto errout_unlock;
}
else
{
/* Not connected. */
ret = -ENOTCONN;
goto errout_unlock;
}
}
if (to || tolen)
{
/* Address provided for connection-mode socket */
ret = -EISCONN;
goto errout_unlock;
}
}
if (conn->state == USRSOCK_CONN_STATE_CONNECTING)
{
/* Non-blocking connecting. */
ninfo("usockid=%d; socket still connecting.\n", conn->usockid);
ret = -EAGAIN;
goto errout_unlock;
}
do
{
/* Check if remote end has closed connection. */
if (conn->flags & USRSOCK_EVENT_REMOTE_CLOSED)
{
ninfo("usockid=%d; remote closed.\n", conn->usockid);
ret = -EPIPE;
goto errout_unlock;
}
/* Check if need to wait for send to become ready. */
if (!(conn->flags & USRSOCK_EVENT_SENDTO_READY))
{
if (_SS_ISNONBLOCK(psock->s_flags) || (flags & MSG_DONTWAIT) != 0)
{
/* Send busy at daemon side. */
ret = -EAGAIN;
goto errout_unlock;
}
/* Wait send to become ready. */
ret = usrsock_setup_request_callback(conn, &state, sendto_event,
USRSOCK_EVENT_ABORT |
USRSOCK_EVENT_SENDTO_READY |
USRSOCK_EVENT_REMOTE_CLOSED);
if (ret < 0)
{
nwarn("usrsock_setup_request_callback failed: %d\n", ret);
goto errout_unlock;
}
/* Wait for send-ready (or abort, or timeout, or signal). */
ret = net_timedwait(&state.recvsem,
_SO_TIMEOUT(psock->s_sndtimeo));
if (ret < 0)
{
if (ret == -ETIMEDOUT)
{
ninfo("sendto timedout\n");
ret = -EAGAIN;
}
else if (ret == -EINTR)
{
ninfo("sendto interrupted\n");
}
else
{
nerr("net_timedwait errno: %d\n", ret);
DEBUGASSERT(false);
}
}
usrsock_teardown_request_callback(&state);
/* Did wait timeout or got signal? */
if (ret != 0)
{
goto errout_unlock;
}
/* Was socket aborted? */
if (conn->state == USRSOCK_CONN_STATE_ABORTED)
{
ret = -EPIPE;
goto errout_unlock;
}
/* Did remote disconnect? */
if (conn->flags & USRSOCK_EVENT_REMOTE_CLOSED)
{
ret = -EPIPE;
goto errout_unlock;
}
DEBUGASSERT(conn->flags & USRSOCK_EVENT_SENDTO_READY);
}
/* Set up event callback for usrsock. */
ret = usrsock_setup_request_callback(conn, &state, sendto_event,
USRSOCK_EVENT_ABORT |
USRSOCK_EVENT_REQ_COMPLETE);
if (ret < 0)
{
nwarn("usrsock_setup_request_callback failed: %d\n", ret);
goto errout_unlock;
}
/* Request user-space daemon to close socket. */
ret = do_sendto_request(conn, buf, len, to, tolen);
if (ret >= 0)
{
/* Wait for completion of request. */
net_lockedwait_uninterruptible(&state.recvsem);
ret = state.result;
DEBUGASSERT(ret <= (ssize_t)len);
}
usrsock_teardown_request_callback(&state);
}
while (ret == -EAGAIN);
errout_unlock:
net_unlock();
return ret;
}
#endif /* CONFIG_NET && CONFIG_NET_USRSOCK */
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