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incubator-nuttx/net/usrsock/usrsock_sendmsg.c

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/****************************************************************************
* net/usrsock/usrsock_sendmsg.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* 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 *pvpriv, uint16_t flags)
{
FAR struct usrsock_reqstate_s *pstate = pvpriv;
FAR struct usrsock_conn_s *conn = pstate->conn;
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 (!(flags & USRSOCK_EVENT_SENDTO_READY) &&
(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 struct msghdr *msg, int flags)
{
struct usrsock_request_sendto_s req =
{
};
struct iovec bufs[2 + msg->msg_iovlen];
int i;
if (msg->msg_namelen > UINT16_MAX)
{
msg->msg_namelen = UINT16_MAX;
}
/* Prepare request for daemon to read. */
req.head.reqid = USRSOCK_REQUEST_SENDTO;
req.usockid = conn->usockid;
req.flags = flags;
req.addrlen = msg->msg_namelen;
for (i = 0; i < msg->msg_iovlen; i++)
{
req.buflen += msg->msg_iov[i].iov_len;
}
if (req.buflen > UINT32_MAX)
{
req.buflen = UINT32_MAX;
}
bufs[0].iov_base = (FAR void *)&req;
bufs[0].iov_len = sizeof(req);
bufs[1].iov_base = msg->msg_name;
bufs[1].iov_len = msg->msg_namelen;
memcpy(&bufs[2], msg->msg_iov, sizeof(struct iovec) * msg->msg_iovlen);
return usrsock_do_request(conn, bufs, nitems(bufs));
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: usrsock_sendmsg
*
* Description:
* If sendmsg() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
* socket, the parameters 'msg_name' and 'msg_namelen' 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 reference to the socket structure of the socket
* msg Message to send
* flags Send flags (ignored)
*
* Returned Value:
* On success, returns the number of characters sent. On any failure, a
* negated errno value is returned.
*
****************************************************************************/
ssize_t usrsock_sendmsg(FAR struct socket *psock,
FAR struct msghdr *msg, int flags)
{
FAR struct usrsock_conn_s *conn = psock->s_conn;
struct usrsock_reqstate_s state =
{
};
ssize_t ret;
net_lock();
if (conn->state == USRSOCK_CONN_STATE_UNINITIALIZED ||
conn->state == USRSOCK_CONN_STATE_ABORTED)
{
/* Invalid state or closed by daemon. */
ninfo("usockid=%d; sendto() with uninitialized usrsock.\n",
conn->usockid);
ret = (conn->state == USRSOCK_CONN_STATE_ABORTED) ? -EPIPE :
-ECONNRESET;
goto errout_unlock;
}
if (psock->s_type == SOCK_STREAM || psock->s_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 (msg->msg_name || msg->msg_namelen)
{
/* 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(conn->sconn.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: %zd\n", ret);
goto errout_unlock;
}
/* Wait for send-ready (or abort, or timeout, or signal). */
ret = net_sem_timedwait(&state.recvsem,
_SO_TIMEOUT(conn->sconn.s_sndtimeo));
usrsock_teardown_request_callback(&state);
if (ret < 0)
{
if (ret == -ETIMEDOUT)
{
ninfo("sendto timedout\n");
ret = -EAGAIN;
}
else if (ret == -EINTR)
{
ninfo("sendto interrupted\n");
}
else
{
nerr("net_sem_timedwait errno: %zd\n", ret);
DEBUGPANIC();
}
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: %zd\n", ret);
goto errout_unlock;
}
/* MSG_DONTWAIT is only use in usrsock. */
flags &= ~MSG_DONTWAIT;
/* Request user-space daemon to close socket. */
ret = do_sendto_request(conn, msg, flags);
if (ret >= 0)
{
/* Wait for completion of request. */
net_sem_wait_uninterruptible(&state.recvsem);
ret = state.result;
}
usrsock_teardown_request_callback(&state);
}
while (ret == -EAGAIN);
errout_unlock:
net_unlock();
return ret;
}
#endif /* CONFIG_NET && CONFIG_NET_USRSOCK */
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